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Pārlūkot izejas kodu

Using same test for input and output of data processor. Added fixes to markdown and HTML processing.

Szymon Kupś 9 gadi atpakaļ
vecāks
revīzija
3092a5bacd

+ 1 - 1
packages/ckeditor5-markdown-gfm/src/lib/marked/renderer.js

@@ -92,7 +92,7 @@ Renderer.prototype.em = function( text ) {
 };
 };
 
 
 Renderer.prototype.codespan = function( text ) {
 Renderer.prototype.codespan = function( text ) {
-	return `<code>${ text }</code>`;
+	return `<code>${ text.trim() }</code>`;
 };
 };
 
 
 Renderer.prototype.br = function() {
 Renderer.prototype.br = function() {

+ 19 - 0
packages/ckeditor5-markdown-gfm/src/lib/to-markdown/converters.js

@@ -48,5 +48,24 @@ export default [
 
 
 			return hPrefix + ' ' + content;
 			return hPrefix + ' ' + content;
 		}
 		}
+	},
+
+	// Inline code - fixing backticks inside code blocks.
+	{
+		filter: function (node) {
+			const hasSiblings = node.previousSibling || node.nextSibling;
+			const isCodeBlock = node.parentNode.nodeName === 'PRE' && !hasSiblings;
+
+			return node.nodeName === 'CODE' && !isCodeBlock;
+		},
+		replacement: function (content) {
+
+			// If content starts or ends with backtick - use double backtick.
+			if ( content.indexOf( '`' ) > -1 ) {
+				return '`` ' + content + ' ``';
+			}
+
+			return '`' + content + '`';
+		}
 	}
 	}
 ];
 ];

+ 15 - 0
packages/ckeditor5-markdown-gfm/tests/_utils/utils.js

@@ -0,0 +1,15 @@
+import { stringify } from '/tests/engine/_utils/view.js';
+import MarkdownDataProcessor from '/ckeditor5/markdown-gfm/gfmdataprocessor.js';
+
+export function testDataProcessor( markdown, viewString, normalizedMd ) {
+	const dataProcessor = new MarkdownDataProcessor();
+	const viewFragment = dataProcessor.toView( markdown );
+
+	// Check if view has correct data.
+	expect( stringify( viewFragment ) ).to.equal( viewString );
+
+	// Check if converting back gives the same result.
+	const normalized = typeof normalizedMd !== 'undefined' ? normalizedMd : markdown;
+
+	expect( dataProcessor.toData( viewFragment ) ).to.equal( normalized );
+}

+ 158 - 162
packages/ckeditor5-markdown-gfm/tests/gfmdataprocessor/blockquotes.js

@@ -3,177 +3,173 @@
  * For licensing, see LICENSE.md.
  * For licensing, see LICENSE.md.
  */
  */
 
 
-import MarkdownDataProcessor from '/ckeditor5/markdown-gfm/gfmdataprocessor.js';
-import DocumentFragment from '/ckeditor5/engine/view/documentfragment.js';
-import { stringify, parse } from '/tests/engine/_utils/view.js';
+import { testDataProcessor as test } from '/tests/markdown-gfm/_utils/utils.js';
 
 
 describe( 'GFMDataProcessor', () => {
 describe( 'GFMDataProcessor', () => {
-	let dataProcessor;
-
-	beforeEach( () => {
-		dataProcessor = new MarkdownDataProcessor();
-	} );
-
 	describe( 'blockquotes', () => {
 	describe( 'blockquotes', () => {
-		describe( 'toView', () => {
-			it( 'should process single blockquotes', () => {
-				const viewFragment = dataProcessor.toView( '> foo bar' );
-
-				expect( stringify( viewFragment ) ).to.equal( '<blockquote><p>foo bar</p></blockquote>' );
-			} );
-
-			it( 'should process nested blockquotes', () => {
-				const viewFragment = dataProcessor.toView( '> foo\n>\n> > bar\n>\n> foo\n' );
-
-				expect( stringify( viewFragment ) ).to.equal( '<blockquote><p>foo</p><blockquote><p>bar</p></blockquote><p>foo</p></blockquote>' );
-			} );
-
-			it( 'should process list within a blockquote', () => {
-				const viewFragment = dataProcessor.toView(
-					'> A list within a blockquote:\n' +
-					'> \n' +
-					'> *	asterisk 1\n' +
-					'> *	asterisk 2\n' +
-					'> *	asterisk 3\n'
-				);
-
-				expect( stringify( viewFragment ) ).to.equal(
-					'<blockquote>' +
-						'<p>A list within a blockquote:</p>' +
-						'<ul>' +
-							'<li>asterisk 1</li>' +
-							'<li>asterisk 2</li>' +
-							'<li>asterisk 3</li>' +
-						'</ul>' +
-					'</blockquote>'
-				);
-			} );
-
-			it( 'should process blockquotes with code inside', () => {
-				const viewFragment = dataProcessor.toView(
-					'> Example 1:\n' +
-					'>\n' +
-					'>     sub status {\n' +
-					'>         print "working";\n' +
-					'>     }\n' +
-					'>\n' +
-					'> Example 2:\n' +
-					'>\n' +
-					'>     sub status {\n' +
-					'>         return "working";\n' +
-					'>     }\n'
-				);
-
-				expect( stringify( viewFragment ) ).to.equal(
-					'<blockquote>' +
-						'<p>Example 1:</p>' +
-						'<pre>' +
-							'<code>' +
-								'sub status {\n' +
-								'    print "working";\n' +
-								'}' +
-							'</code>' +
-						'</pre>' +
-						'<p>Example 2:</p>' +
-						'<pre>' +
-							'<code>' +
-								'sub status {\n' +
-								'    return "working";\n' +
-								'}' +
-							'</code>' +
-						'</pre>' +
-					'</blockquote>'
-				);
-			} );
+		it( 'should process single blockquotes', () => {
+			test(
+				'> foo bar',
+
+				// GitHub is rendering as:
+				//
+				// <blockquote>
+				// <p>foo bar</p>
+				// </blockquote>
+				'<blockquote><p>foo bar</p></blockquote>'
+			);
 		} );
 		} );
 
 
-		describe( 'toData', () => {
-			let viewFragment;
-
-			beforeEach( () => {
-				viewFragment = new DocumentFragment();
-			} );
-
-			it( 'should process single blockquotes', () => {
-				viewFragment.appendChildren( parse( '<blockquote><p>foo bar</p></blockquote>' ) );
-
-				expect( dataProcessor.toData( viewFragment ) ).to.equal( '> foo bar' );
-			} );
-
-			it( 'should process nested blockquotes', () => {
-				viewFragment.appendChildren( parse(
+		it( 'should process nested blockquotes', () => {
+			test(
+				'> foo\n' +
+				'> \n' +
+				'> > bar\n' +
+				'> \n' +
+				'> foo',
+
+				// GitHub is rendering as:
+				// <blockquote>
+				// <p>foo</p>
+				//
+				// <blockquote>
+				// <p>bar</p>
+				// </blockquote>
+				//
+				// <p>foo</p>
+				// </blockquote>
+				'<blockquote>' +
+					'<p>foo</p>' +
 					'<blockquote>' +
 					'<blockquote>' +
-						'<p>foo</p>' +
-						'<blockquote>' +
-							'<p>bar</p>' +
-						'</blockquote>' +
-						'<p>foo</p>' +
-					'</blockquote>'
-				) );
-
-				expect( dataProcessor.toData( viewFragment ) ).to.equal(
-					'> foo\n' +
-					'> \n' +
-					'> > bar\n' +
-					'> \n' +
-					'> foo'
-				);
-			} );
-
-			it( 'should process list within a blockquote', () => {
-				viewFragment.appendChildren( parse(
-					'<blockquote>' +
-						'<p>A list within a blockquote:</p>' +
-						'<ul>' +
-							'<li>asterisk 1</li>' +
-							'<li>asterisk 2</li>' +
-							'<li>asterisk 3</li>' +
-						'</ul>' +
-					'</blockquote>'
-				) );
+						'<p>bar</p>' +
+					'</blockquote>' +
+					'<p>foo</p>' +
+				'</blockquote>'
+			);
+		} );
 
 
-				expect( dataProcessor.toData( viewFragment ) ).to.equal(
-					'> A list within a blockquote:\n' +
-					'> \n' +
-					'> *   asterisk 1\n' +
-					'> *   asterisk 2\n' +
-					'> *   asterisk 3'
-				);
-			} );
+		it( 'should process list within a blockquote', () => {
+			test(
+				'> A list within a blockquote:\n' +
+				'> \n' +
+				'> *   asterisk 1\n' +
+				'> *   asterisk 2\n' +
+				'> *   asterisk 3',
+
+				// GitHub is rendering as:
+				// <blockquote>
+				// <p>A list within a blockquote:</p>
+				//
+				// <ul>
+				// <li>asterisk 1</li>
+				// <li>asterisk 2</li>
+				// <li>asterisk 3</li>
+				// </ul>
+				// </blockquote>
+				'<blockquote>' +
+					'<p>A list within a blockquote:</p>' +
+					'<ul>' +
+						'<li>asterisk 1</li>' +
+						'<li>asterisk 2</li>' +
+						'<li>asterisk 3</li>' +
+					'</ul>' +
+				'</blockquote>'
+			);
+		} );
 
 
-			it( 'should process blockquotes with code inside', () => {
-				viewFragment.appendChildren( parse(
-					'<blockquote>' +
-						'<p>Example 1:</p>' +
-						'<pre>' +
-							'<code>' +
-								'code' +
-							'</code>' +
-						'</pre>' +
-						'<p>Example 2:</p>' +
-						'<pre>' +
-							'<code>' +
-								'code' +
-							'</code>' +
-						'</pre>' +
-					'</blockquote>',
-					{ sameSelectionCharacters: true }
-				) );
+		it( 'should process blockquotes with code inside with ```', () => {
+			test(
+				'> Example 1:\n' +
+				'> \n' +
+				'> ```\n' +
+				'> code 1\n' +
+				'> ```\n' +
+				'> \n' +
+				'> Example 2:\n' +
+				'> \n' +
+				'> ```\n' +
+				'> code 2\n' +
+				'> ```',
+
+				// GitHub is rendering as:
+				// <blockquote>
+				// <p>Example 1:</p>
+				//
+				// <pre><code>code 1
+				// </code></pre>
+				//
+				// <p>Example 2:</p>
+				//
+				// <pre><code>code 2
+				// </code></pre>
+				// </blockquote>
+				'<blockquote>' +
+					'<p>Example 1:</p>' +
+					'<pre>' +
+						'<code>' +
+							'code 1' +
+						'</code>' +
+					'</pre>' +
+					'<p>Example 2:</p>' +
+					'<pre>' +
+						'<code>' +
+							'code 2' +
+						'</code>' +
+					'</pre>' +
+				'</blockquote>'
+			);
+		} );
 
 
-				expect( dataProcessor.toData( viewFragment ) ).to.equal(
-					'> Example 1:\n' +
-					'> \n' +
-					'> ```\n' +
-					'> code\n' +
-					'> ```\n' +
-					'> \n' +
-					'> Example 2:\n' +
-					'> \n' +
-					'> ```\n' +
-					'> code\n' +
-					'> ```'
-				);
-			} );
+		it( 'should process blockquotes with code inside with tabs', () => {
+			test(
+				'> Example 1:\n' +
+				'>\n' +
+				'>     code 1\n' +
+				'>\n' +
+				'> Example 2:\n' +
+				'>\n' +
+				'>     code 2\n',
+
+				// GitHub is rendering as:
+				// <blockquote>
+				// <p>Example 1:</p>
+				//
+				// <pre><code>code 1
+				// </code></pre>
+				//
+				// <p>Example 2:</p>
+				//
+				// <pre><code>code 2
+				// </code></pre>
+				// </blockquote>
+				'<blockquote>' +
+					'<p>Example 1:</p>' +
+					'<pre>' +
+						'<code>' +
+							'code 1' +
+						'</code>' +
+					'</pre>' +
+					'<p>Example 2:</p>' +
+					'<pre>' +
+						'<code>' +
+							'code 2' +
+						'</code>' +
+					'</pre>' +
+				'</blockquote>',
+
+				// When converting back to data, DataProcessor will normalize tabs to ```.
+				'> Example 1:\n' +
+				'> \n' +
+				'> ```\n' +
+				'> code 1\n' +
+				'> ```\n' +
+				'> \n' +
+				'> Example 2:\n' +
+				'> \n' +
+				'> ```\n' +
+				'> code 2\n' +
+				'> ```'
+			);
 		} );
 		} );
 	} );
 	} );
 } );
 } );

+ 279 - 192
packages/ckeditor5-markdown-gfm/tests/gfmdataprocessor/code.js

@@ -3,202 +3,289 @@
  * For licensing, see LICENSE.md.
  * For licensing, see LICENSE.md.
  */
  */
 
 
-import MarkdownDataProcessor from '/ckeditor5/markdown-gfm/gfmdataprocessor.js';
-import DocumentFragment from '/ckeditor5/engine/view/documentfragment.js';
-import { stringify, parse } from '/tests/engine/_utils/view.js';
+import { testDataProcessor as test } from '/tests/markdown-gfm/_utils/utils.js';
 
 
 describe( 'GFMDataProcessor', () => {
 describe( 'GFMDataProcessor', () => {
-	let dataProcessor;
+	describe( 'code', () => {
+		it( 'should process inline code', () => {
+			test(
+				'regular text and `inline code`',
+
+				// GitHub is rendering as:
+				// <p>regular text and <code>inline code</code></p>
+				'<p>regular text and <code>inline code</code></p>'
+			);
+		} );
 
 
-	beforeEach( () => {
-		dataProcessor = new MarkdownDataProcessor();
-	} );
+		it( 'should properly process multiple code', () => {
+			test(
+				'`this is code` and this is `too`',
 
 
-	describe( 'code', () => {
-		describe( 'toView', () => {
-			it( 'should process inline code', () => {
-				const viewFragment = dataProcessor.toView( 'regular text and `inline code`' );
-
-				expect( stringify( viewFragment ) ).to.equal( '<p>regular text and <code>inline code</code></p>' );
-			} );
-
-			it( 'should properly process backticks when combined', () => {
-				const viewFragment = dataProcessor.toView( '`<fake a="` content of attribute `">`' );
-
-				expect( stringify( viewFragment ) ).to.equal( '<p><code><fake a="</code> content of attribute <code>"></code></p>' );
-			} );
-
-			it( 'should properly process backticks inside code spans', () => {
-				const viewFragment = dataProcessor.toView( '`` `backticks` ``' );
-
-				// This should be checked - why there is a space after `bacticks`.
-				expect( stringify( viewFragment ) ).to.equal( '<p><code>`backticks` </code></p>' );
-			} );
-
-			it( 'should process code blocks indented with tabs', () => {
-				const viewFragment = dataProcessor.toView( '	code block' );
-
-				expect( stringify( viewFragment ) ).to.equal( '<pre><code>code block</code></pre>' );
-			} );
-
-			it( 'should process code blocks indented with spaces', () => {
-				const viewFragment = dataProcessor.toView( '    code block' );
-
-				expect( stringify( viewFragment ) ).to.equal( '<pre><code>code block</code></pre>' );
-			} );
-
-			it( 'should process multi line code blocks indented with tabs', () => {
-				const viewFragment = dataProcessor.toView( '	first line\n	second line' );
-
-				expect( stringify( viewFragment ) ).to.equal( '<pre><code>first line\nsecond line</code></pre>' );
-			} );
-
-			it( 'should process multi line code blocks indented with spaces', () => {
-				const viewFragment = dataProcessor.toView( '    first line\n    second line' );
-
-				expect( stringify( viewFragment ) ).to.equal( '<pre><code>first line\nsecond line</code></pre>' );
-			} );
-
-			it( 'should process multi line code blocks with trailing spaces', () => {
-				const viewFragment = dataProcessor.toView( '	the lines in this block  \n	all contain trailing spaces  ' );
-
-				expect( stringify( viewFragment ) ).to.equal( '<pre><code>the lines in this block  \nall contain trailing spaces  </code></pre>' );
-			} );
-
-			it( 'should process code block with language name', () => {
-				const viewFragment = dataProcessor.toView(
-					'``` js\n' +
-					'var a = \'hello\';\n' +
-					'console.log(a + \' world\');\n' +
-					'```'
-				);
-
-				expect( stringify( viewFragment ) ).to.equal(
-					'<pre>' +
-						'<code class="lang-js">' +
-							'var a = \'hello\';\n' +
-							'console.log(a + \' world\');' +
-						'</code>' +
-					'</pre>' );
-			} );
-
-			it( 'should process code block with language name and using ~~~ as delimiter', () => {
-				const viewFragment = dataProcessor.toView(
-					'~~~ bash\n' +
-					'var a = \'hello\';\n' +
-					'console.log(a + \' world\');\n' +
-					'~~~'
-				);
-
-				expect( stringify( viewFragment ) ).to.equal(
-					'<pre>' +
-					'<code class="lang-bash">' +
-					'var a = \'hello\';\n' +
-					'console.log(a + \' world\');' +
-					'</code>' +
-					'</pre>' );
-			} );
-
-			it( 'should process code block with language name and using ``````` as delimiter', () => {
-				const viewFragment = dataProcessor.toView(
-					'``````` js\n' +
-					'var a = \'hello\';\n' +
-					'console.log(a + \' world\');\n' +
-					'```````'
-				);
-
-				expect( stringify( viewFragment ) ).to.equal(
-					'<pre>' +
-					'<code class="lang-js">' +
-					'var a = \'hello\';\n' +
-					'console.log(a + \' world\');' +
-					'</code>' +
-					'</pre>' );
-			} );
-
-			it( 'should process code block with language name and using ~~~~~~~~~~ as delimiter', () => {
-				const viewFragment = dataProcessor.toView(
-					'~~~~~~~~~~ js\n' +
-					'var a = \'hello\';\n' +
-					'console.log(a + \' world\');\n' +
-					'~~~~~~~~~~'
-				);
-
-				expect( stringify( viewFragment ) ).to.equal(
-					'<pre>' +
-					'<code class="lang-js">' +
-					'var a = \'hello\';\n' +
-					'console.log(a + \' world\');' +
-					'</code>' +
-					'</pre>' );
-			} );
-
-			it( 'should process empty code block', () => {
-				const viewFragment = dataProcessor.toView(
-					'``` js\n' +
-					'```'
-				);
-
-				expect( stringify( viewFragment ) ).to.equal(
-					'<pre>' +
-						'<code class="lang-js">' +
-						'</code>' +
-					'</pre>' );
-			} );
-
-			it( 'should process code block with empty line', () => {
-				const viewFragment = dataProcessor.toView(
-					'``` js\n\n' +
-					'```'
-				);
-
-				expect( stringify( viewFragment ) ).to.equal(
-					'<pre>' +
-					'<code class="lang-js">' +
-					'</code>' +
-					'</pre>'
-				);
-			} );
-
-			it( 'should process nested code', () => {
-				const viewFragment = dataProcessor.toView(
-					'````` code `` code ``` `````'
-				);
-
-				expect( stringify( viewFragment ) ).to.equal(
-					'<p><code>code `` code ``` </code></p>'
-				);
-			} );
-		} );
-
-		describe( 'toData', () => {
-			let viewFragment;
-
-			beforeEach( () => {
-				viewFragment = new DocumentFragment();
-			} );
-
-			it( 'should process inline code', () => {
-				viewFragment.appendChildren( parse( '<p>regular text and <code>inline code</code></p>' ) );
-
-				expect( dataProcessor.toData( viewFragment ) ).to.equal( 'regular text and `inline code`' );
-			} );
-
-			it( 'should properly process code blocks', () => {
-				viewFragment.appendChildren( parse( '<pre><code>code block</code></pre>' ) );
-
-				expect( dataProcessor.toData( viewFragment ) ).to.equal( '```\ncode block\n```' );
-			} );
-
-			it( 'should process code block with language name', () => {
-				viewFragment.appendChildren( parse( '<pre><code class="lang-js">code block</code></pre>' ) );
-
-				expect( dataProcessor.toData( viewFragment ) ).to.equal(
-					'``` js\n' +
-					'code block\n' +
-					'```'
-				);
-			} );
+				// GitHub is rendering as:
+				// <p><code>this is code</code> and this is <code>too</code></p>
+				'<p><code>this is code</code> and this is <code>too</code></p>'
+			);
+		} );
+
+		it( 'should process spaces inside inline code', () => {
+			test(
+				'regular text and` inline code`',
+
+				// GitHub is rendering as:
+				// <p>regular text and<code>inline code</code></p>
+				'<p>regular text and<code>inline code</code></p>',
+
+				// When converting back it will be normalized and spaces
+				// at the beginning of inline code will be removed.
+				'regular text and`inline code`'
+			);
+		} );
+
+		it( 'should properly process backticks inside code spans #1', () => {
+			test(
+				'`` `backticks` ``',
+
+				// GitHub is rendering as:
+				// <p><code>`backticks`</code></p>
+				'<p><code>`backticks`</code></p>'
+			);
+		} );
+
+		it( 'should properly process backticks inside code spans #2', () => {
+			test(
+				'`` some `backticks` inside ``',
+
+				// GitHub is rendering as:
+				// <p><code>some `backticks` inside</code></p>
+				'<p><code>some `backticks` inside</code></p>'
+			);
+		} );
+
+		it( 'should process code blocks indented with tabs', () => {
+			test(
+				'	code block',
+
+				// GitHub is rendering as:
+				// <pre><code>code block
+				// </code></pre>
+				'<pre><code>code block</code></pre>',
+
+				// When converting back tabs are normalized to ```.
+				'```\n' +
+				'code block\n' +
+				'```'
+			);
+		} );
+
+		it( 'should process code blocks indented with spaces', () => {
+			test(
+				'    code block',
+
+				// GitHub is rendering as:
+				// <pre><code>code block
+				// </code></pre>
+
+				'<pre><code>code block</code></pre>',
+
+				// When converting back tabs are normalized to ```.
+
+				'```\n' +
+				'code block\n' +
+				'```'
+			);
+		} );
+
+		it( 'should process multi line code blocks indented with tabs', () => {
+			test(
+				'	first line\n' +
+				'	second line',
+
+				// GitHub is rendering as:
+				// <pre><code>first line
+				// second line
+				// </code></pre>
+
+				'<pre><code>first line\n' +
+				'second line</code></pre>',
+
+				// When converting back tabs are normalized to ```.
+
+				'```\n' +
+				'first line\n' +
+				'second line\n' +
+				'```'
+			);
+		} );
+
+		it( 'should process multi line code blocks indented with spaces', () => {
+			test(
+				'    first line\n' +
+				'    second line',
+
+				// GitHub is rendering as:
+				// <pre><code>first line
+				// second line
+				// </code></pre>
+
+				'<pre><code>first line\n' +
+				'second line</code></pre>',
+
+				// When converting back spaces are normalized to ```.
+
+				'```\n' +
+				'first line\n' +
+				'second line\n' +
+				'```'
+			);
+		} );
+
+		it( 'should process multi line code blocks with trailing spaces', () => {
+			test(
+				'	the lines in this block  \n' +
+				'	all contain trailing spaces  ',
+
+				// GitHub is rendering as:
+				// <pre><code>the lines in this block
+				// all contain trailing spaces
+				// </code></pre>
+
+				'<pre><code>the lines in this block  \n' +
+				'all contain trailing spaces  </code></pre>',
+
+				// When converting back tabs are normalized to ```.
+
+				'```\n' +
+				'the lines in this block  \n' +
+				'all contain trailing spaces  \n' +
+				'```'
+			);
+		} );
+
+		it( 'should process code block with language name', () => {
+			test(
+				'``` js\n' +
+				'var a = \'hello\';\n' +
+				'console.log(a + \' world\');\n' +
+				'```',
+
+				// GitHub is rendering as special html with syntax highlighting.
+				// We will need to handle this separately by some feature.
+
+				'<pre><code class="lang-js">var a = \'hello\';\n' +
+				'console.log(a + \' world\');</code></pre>'
+			);
+		} );
+
+		it( 'should process code block with language name and using ~~~ as delimiter', () => {
+			test(
+				'~~~ bash\n' +
+				'#!/bin/bash\n' +
+				'~~~',
+
+				// GitHub is rendering as special html with syntax highlighting.
+				// We will need to handle this separately by some feature.
+
+				'<pre><code class="lang-bash">#!/bin/bash</code></pre>',
+
+				// When converting back ~~~ are normalized to ```.
+
+				'``` bash\n' +
+				'#!/bin/bash\n' +
+				'```'
+			);
+		} );
+
+		it( 'should process code block with language name and using ``````` as delimiter', () => {
+			test(
+				'``````` js\n' +
+				'var a = \'hello\';\n' +
+				'console.log(a + \' world\');\n' +
+				'```````',
+
+				// GitHub is rendering as special html with syntax highlighting.
+				// We will need to handle this separately by some feature.
+
+				'<pre><code class="lang-js">var a = \'hello\';\n' +
+				'console.log(a + \' world\');</code></pre>',
+
+				// When converting back ``````` are normalized to ```.
+
+				'``` js\n' +
+				'var a = \'hello\';\n' +
+				'console.log(a + \' world\');\n' +
+				'```'
+			);
+		} );
+
+		it( 'should process code block with language name and using ~~~~~~~~~~ as delimiter', () => {
+			test(
+				'~~~~~~~~~~ js\n' +
+				'var a = \'hello\';\n' +
+				'console.log(a + \' world\');\n' +
+				'~~~~~~~~~~',
+
+				// GitHub is rendering as special html with syntax highlighting.
+				// We will need to handle this separately by some feature.
+
+				'<pre><code class="lang-js">var a = \'hello\';\n' +
+				'console.log(a + \' world\');</code></pre>',
+
+				// When converting back ~~~~~~~~~~ are normalized to ```.
+
+				'``` js\n' +
+				'var a = \'hello\';\n' +
+				'console.log(a + \' world\');\n' +
+				'```'
+			);
+		} );
+
+		it( 'should process empty code block', () => {
+			test(
+				'``` js\n' +
+				'```',
+
+				// GitHub is rendering as special html with syntax highlighting.
+				// We will need to handle this separately by some feature.
+
+				'<pre><code class="lang-js"></code></pre>',
+
+				// When converting back, empty code blocks will be removed.
+				// This might be an issue when switching from source to editor
+				// but changing this cannot be done in to-markdown converters.
+				''
+			);
+		} );
+
+		it( 'should process code block with empty line', () => {
+			test(
+				'``` js\n' +
+				'\n' +
+				'```',
+
+				// GitHub is rendering as special html with syntax highlighting.
+				// We will need to handle this separately by some feature.
+
+				'<pre><code class="lang-js"></code></pre>',
+
+				// When converting back, empty code blocks will be removed.
+				// This might be an issue when switching from source to editor
+				// but changing this cannot be done in to-markdown converters.
+				''
+			);
+		} );
+
+		it( 'should process nested code', () => {
+			test(
+				'````` code `` code ``` `````',
+
+				// GitHub is rendering as:
+				// <p><code>code `` code ```</code></p>
+
+				'<p><code>code `` code ```</code></p>',
+
+				// When converting back ````` will be normalized to ``.
+				'`` code `` code ``` ``'
+			);
 		} );
 		} );
 	} );
 	} );
 } );
 } );

+ 16 - 38
packages/ckeditor5-markdown-gfm/tests/gfmdataprocessor/del.js

@@ -3,50 +3,28 @@
  * For licensing, see LICENSE.md.
  * For licensing, see LICENSE.md.
  */
  */
 
 
-import MarkdownDataProcessor from '/ckeditor5/markdown-gfm/gfmdataprocessor.js';
-import DocumentFragment from '/ckeditor5/engine/view/documentfragment.js';
-import { stringify, parse } from '/tests/engine/_utils/view.js';
+import { testDataProcessor as test } from '/tests/markdown-gfm/_utils/utils.js';
 
 
 describe( 'GFMDataProcessor', () => {
 describe( 'GFMDataProcessor', () => {
-	let dataProcessor;
-
-	beforeEach( () => {
-		dataProcessor = new MarkdownDataProcessor();
-	} );
-
 	describe( 'del', () => {
 	describe( 'del', () => {
-		describe( 'toView', () => {
-			it( 'should process deleted text', () => {
-				const viewFragment = dataProcessor.toView( '~~deleted~~' );
-
-				expect( stringify( viewFragment ) ).to.equal( '<p><del>deleted</del></p>' );
-			} );
-
-			it( 'should process deleted inside text', () => {
-				const viewFragment = dataProcessor.toView( 'This is ~~deleted content~~.' );
-
-				expect( stringify( viewFragment ) ).to.equal( '<p>This is <del>deleted content</del>.</p>' );
-			} );
+		it( 'should process deleted text', () => {
+			test(
+				'~~deleted~~',
+
+				// GitHub is rendering as:
+				// <p><del>deleted</del></p>
+				'<p><del>deleted</del></p>'
+			);
 		} );
 		} );
 
 
-		describe( 'toData', () => {
-			let viewFragment;
-
-			beforeEach( () => {
-				viewFragment = new DocumentFragment();
-			} );
-
-			it( 'should process deleted text', () => {
-				viewFragment.appendChildren( parse( '<p><del>deleted</del></p>' ) );
-
-				expect( dataProcessor.toData( viewFragment ) ).to.equal( '~~deleted~~' );
-			} );
-
-			it( 'should process deleted inside text', () => {
-				viewFragment.appendChildren( parse( '<p>This is <del>deleted content</del>.</p>' ) );
+		it( 'should process deleted inside text', () => {
+			test(
+				'This is ~~deleted content~~.',
 
 
-				expect( dataProcessor.toData( viewFragment ) ).to.equal( 'This is ~~deleted content~~.' );
-			} );
+				// GitHub is rendering as:
+				// <p>This is <del>deleted content</del>.</p>
+				'<p>This is <del>deleted content</del>.</p>'
+			);
 		} );
 		} );
 	} );
 	} );
 } );
 } );

+ 80 - 87
packages/ckeditor5-markdown-gfm/tests/gfmdataprocessor/headers.js

@@ -3,116 +3,109 @@
  * For licensing, see LICENSE.md.
  * For licensing, see LICENSE.md.
  */
  */
 
 
-import MarkdownDataProcessor from '/ckeditor5/markdown-gfm/gfmdataprocessor.js';
-import DocumentFragment from '/ckeditor5/engine/view/documentfragment.js';
-import { stringify, parse } from '/tests/engine/_utils/view.js';
+import { testDataProcessor as test } from '/tests/markdown-gfm/_utils/utils.js';
 
 
 describe( 'GFMDataProcessor', () => {
 describe( 'GFMDataProcessor', () => {
-	let dataProcessor;
-
-	beforeEach( () => {
-		dataProcessor = new MarkdownDataProcessor();
-	} );
-
 	describe( 'headers', () => {
 	describe( 'headers', () => {
-		describe( 'toView', () => {
-			it( 'should process level 1 header #1', () => {
-				const viewFragment = dataProcessor.toView( '# Level 1' );
-
-				expect( stringify( viewFragment ) ).to.equal( '<h1 id="level-1">Level 1</h1>' );
-			} );
-
-			it( 'should process level 1 header #2', () => {
-				const viewFragment = dataProcessor.toView( 'Level 1\n===' );
-
-				expect( stringify( viewFragment ) ).to.equal( '<h1 id="level-1">Level 1</h1>' );
-			} );
-
-			it( 'should process level 2 header #1', () => {
-				const viewFragment = dataProcessor.toView( '## Level 2' );
-
-				expect( stringify( viewFragment ) ).to.equal( '<h2 id="level-2">Level 2</h2>' );
-			} );
-
-			it( 'should process level 2 header #2', () => {
-				const viewFragment = dataProcessor.toView( 'Level 2\n---' );
-
-				expect( stringify( viewFragment ) ).to.equal( '<h2 id="level-2">Level 2</h2>' );
-			} );
-
-			it( 'should process level 3 header', () => {
-				const viewFragment = dataProcessor.toView( '### Level 3' );
-
-				expect( stringify( viewFragment ) ).to.equal( '<h3 id="level-3">Level 3</h3>' );
-			} );
-
-			it( 'should process level 4 header', () => {
-				const viewFragment = dataProcessor.toView( '#### Level 4' );
-
-				expect( stringify( viewFragment ) ).to.equal( '<h4 id="level-4">Level 4</h4>' );
-			} );
-
-			it( 'should process level 5 header', () => {
-				const viewFragment = dataProcessor.toView( '##### Level 5' );
+		it( 'should process level 1 header #1', () => {
+			test(
+				'# Level 1',
+
+				// GitHub is rendering as:
+				// <h1>Level 1</h1>
+				'<h1 id="level-1">Level 1</h1>'
+			);
+		} );
 
 
-				expect( stringify( viewFragment ) ).to.equal( '<h5 id="level-5">Level 5</h5>' );
-			} );
+		it( 'should process level 1 header #2', () => {
+			test(
+				'Level 1\n' +
+				'===',
 
 
-			it( 'should process level 6 header', () => {
-				const viewFragment = dataProcessor.toView( '###### Level 6' );
+				// GitHub is rendering as:
+				// <h1>Level 1</h1>
+				'<h1 id="level-1">Level 1</h1>',
 
 
-				expect( stringify( viewFragment ) ).to.equal( '<h6 id="level-6">Level 6</h6>' );
-			} );
+				// When converting back it will be normalized to # representation.
+				'# Level 1'
+			);
+		} );
 
 
-			it( 'should create header when more spaces before text', () => {
-				const viewFragment = dataProcessor.toView( '#      Level 1' );
+		it( 'should process level 2 header #1', () => {
+			test(
+				'## Level 2',
 
 
-				expect( stringify( viewFragment ) ).to.equal( '<h1 id="level-1">Level 1</h1>' );
-			} );
+				// GitHub is rendering as:
+				// <h2>Level 2</h2>
+				'<h2 id="level-2">Level 2</h2>'
+			);
 		} );
 		} );
 
 
-		describe( 'toData', () => {
-			let viewFragment;
+		it( 'should process level 2 header #2', () => {
+			test(
+				'Level 2\n' +
+				'---',
 
 
-			beforeEach( () => {
-				viewFragment = new DocumentFragment();
-			} );
+				// GitHub is rendering as:
+				// <h2>Level 2</h2>
+				'<h2 id="level-2">Level 2</h2>',
 
 
-			it( 'should process level 1 header', () => {
-				viewFragment.appendChildren( parse( '<h1 id="level-1">Level 1</h1>' ) );
+				// When converting back it will be normalized to ## representation.
+				'## Level 2'
+			);
+		} );
 
 
-				expect( dataProcessor.toData( viewFragment ) ).to.equal( '# Level 1' );
-			} );
+		it( 'should process level 3 header', () => {
+			test(
+				'### Level 3',
 
 
-			it( 'should process level 2 header', () => {
-				viewFragment.appendChildren( parse( '<h2 id="level-2">Level 2</h2>' ) );
+				// GitHub is rendering as:
+				// <h3>Level 3</h3>
+				'<h3 id="level-3">Level 3</h3>'
+			);
+		} );
 
 
-				expect( dataProcessor.toData( viewFragment ) ).to.equal( '## Level 2' );
-			} );
+		it( 'should process level 4 header', () => {
+			test(
+				'#### Level 4',
 
 
-			it( 'should process level 3 header', () => {
-				viewFragment.appendChildren( parse( '<h3 id="level-3">Level 3</h3>' ) );
+				// GitHub is rendering as:
+				// <h4>Level 4</h4>
+				'<h4 id="level-4">Level 4</h4>'
+			);
+		} );
 
 
-				expect( dataProcessor.toData( viewFragment ) ).to.equal( '### Level 3' );
-			} );
+		it( 'should process level 5 header', () => {
+			test(
+				'##### Level 5',
 
 
-			it( 'should process level 4 header', () => {
-				viewFragment.appendChildren( parse( '<h4 id="level-4">Level 4</h4>' ) );
+				// GitHub is rendering as:
+				// <h5>Level 5</h5>
+				'<h5 id="level-5">Level 5</h5>'
+			);
+		} );
 
 
-				expect( dataProcessor.toData( viewFragment ) ).to.equal( '#### Level 4' );
-			} );
+		it( 'should process level 6 header', () => {
+			test(
+				'###### Level 6',
 
 
-			it( 'should process level 5 header', () => {
-				viewFragment.appendChildren( parse( '<h5 id="level-5">Level 5</h5>' ) );
+				// GitHub is rendering as:
+				// <h6>Level 6</h6>
+				'<h6 id="level-6">Level 6</h6>'
+			);
+		} );
 
 
-				expect( dataProcessor.toData( viewFragment ) ).to.equal( '##### Level 5' );
-			} );
+		it( 'should create header when more spaces before text', () => {
+			test(
+				'#      Level 1',
 
 
-			it( 'should process level 6 header', () => {
-				viewFragment.appendChildren( parse( '<h6 id="level-6">Level 6</h6>' ) );
+				// GitHub is rendering as:
+				// <h1>Level 6</h1>
+				'<h1 id="level-1">Level 1</h1>',
 
 
-				expect( dataProcessor.toData( viewFragment ) ).to.equal( '###### Level 6' );
-			} );
+				// When converting back it will be normalized to # Level 1.
+				'# Level 1'
+			);
 		} );
 		} );
 	} );
 	} );
 } );
 } );

+ 146 - 163
packages/ckeditor5-markdown-gfm/tests/gfmdataprocessor/horizontal_rules.js

@@ -3,218 +3,201 @@
  * For licensing, see LICENSE.md.
  * For licensing, see LICENSE.md.
  */
  */
 
 
-import MarkdownDataProcessor from '/ckeditor5/markdown-gfm/gfmdataprocessor.js';
-import DocumentFragment from '/ckeditor5/engine/view/documentfragment.js';
-import { stringify, parse } from '/tests/engine/_utils/view.js';
+import { testDataProcessor as test } from '/tests/markdown-gfm/_utils/utils.js';
 
 
 describe( 'GFMDataProcessor', () => {
 describe( 'GFMDataProcessor', () => {
-	let dataProcessor;
-
-	beforeEach( () => {
-		dataProcessor = new MarkdownDataProcessor();
-	} );
-
+	// Horizontal rules are are always rendered by GitHub as <hr> and normalized when converting
+	// back to * * *.
 	describe( 'horizontal rules', () => {
 	describe( 'horizontal rules', () => {
-		describe( 'toView', () => {
-			describe( 'dashes', () => {
-				it( '#1', () => {
-					const viewFragment = dataProcessor.toView( '---' );
-
-					expect( stringify( viewFragment ) ).to.equal( '<hr></hr>' );
-				} );
-
-				it( '#2', () => {
-					const viewFragment = dataProcessor.toView( ' ---' );
-
-					expect( stringify( viewFragment ) ).to.equal( '<hr></hr>' );
-				} );
-
-				it( '#3', () => {
-					const viewFragment = dataProcessor.toView( '  ---' );
-
-					expect( stringify( viewFragment ) ).to.equal( '<hr></hr>' );
-				} );
-
-				it( '#4', () => {
-					const viewFragment = dataProcessor.toView( '   ---' );
-
-					expect( stringify( viewFragment ) ).to.equal( '<hr></hr>' );
-				} );
-
-				it( '#5 - code', () => {
-					const viewFragment = dataProcessor.toView( '	---' );
-
-					expect( stringify( viewFragment ) ).to.equal( '<pre><code>---</code></pre>' );
-				} );
+		describe( 'dashes', () => {
+			it( '#1', () => {
+				test( '---', '<hr></hr>', '* * *' );
 			} );
 			} );
 
 
-			describe( 'dashes with spaces', () => {
-				it( '#1', () => {
-					const viewFragment = dataProcessor.toView( '- - -' );
-
-					expect( stringify( viewFragment ) ).to.equal( '<hr></hr>' );
-				} );
-
-				it( '#2', () => {
-					const viewFragment = dataProcessor.toView( ' - - -' );
-
-					expect( stringify( viewFragment ) ).to.equal( '<hr></hr>' );
-				} );
-
-				it( '#3', () => {
-					const viewFragment = dataProcessor.toView( '  - - -' );
-
-					expect( stringify( viewFragment ) ).to.equal( '<hr></hr>' );
-				} );
-
-				it( '#4', () => {
-					const viewFragment = dataProcessor.toView( '   - - -' );
-
-					expect( stringify( viewFragment ) ).to.equal( '<hr></hr>' );
-				} );
-
-				it( '#5 - code', () => {
-					const viewFragment = dataProcessor.toView( '	- - -' );
-
-					expect( stringify( viewFragment ) ).to.equal( '<pre><code>- - -</code></pre>' );
-				} );
+			it( '#2', () => {
+				test( ' ---', '<hr></hr>', '* * *' );
 			} );
 			} );
 
 
-			describe( 'asterisks', () => {
-				it( '#1', () => {
-					const viewFragment = dataProcessor.toView( '***' );
-
-					expect( stringify( viewFragment ) ).to.equal( '<hr></hr>' );
-				} );
+			it( '#3', () => {
+				test( '  ---', '<hr></hr>', '* * *' );
+			} );
 
 
-				it( '#2', () => {
-					const viewFragment = dataProcessor.toView( ' ***' );
+			it( '#4', () => {
+				test( '   ---', '<hr></hr>', '* * *' );
+			} );
 
 
-					expect( stringify( viewFragment ) ).to.equal( '<hr></hr>' );
-				} );
+			it( '#5 - code', () => {
+				test(
+					'    ---',
 
 
-				it( '#3', () => {
-					const viewFragment = dataProcessor.toView( '  ***' );
+					// Four spaces are interpreted as code block.
+					'<pre><code>---</code></pre>',
 
 
-					expect( stringify( viewFragment ) ).to.equal( '<hr></hr>' );
-				} );
+					// Code block will be normalized to ``` representation.
+					'```\n' +
+					'---\n' +
+					'```'
+				);
+			} );
+		} );
 
 
-				it( '#4', () => {
-					const viewFragment = dataProcessor.toView( '   ***' );
+		describe( 'dashes with spaces', () => {
+			it( '#1', () => {
+				test( '- - -', '<hr></hr>', '* * *' );
+			} );
 
 
-					expect( stringify( viewFragment ) ).to.equal( '<hr></hr>' );
-				} );
+			it( '#2', () => {
+				test( ' - - -', '<hr></hr>', '* * *' );
+			} );
 
 
-				it( '#5 - code', () => {
-					const viewFragment = dataProcessor.toView( '	***' );
+			it( '#3', () => {
+				test( '  - - -', '<hr></hr>', '* * *' );
+			} );
 
 
-					expect( stringify( viewFragment ) ).to.equal( '<pre><code>***</code></pre>' );
-				} );
+			it( '#4', () => {
+				test( '   - - -', '<hr></hr>', '* * *' );
 			} );
 			} );
 
 
-			describe( 'asterisks with spaces', () => {
-				it( '#1', () => {
-					const viewFragment = dataProcessor.toView( '* * *' );
+			it( '#5 - code', () => {
+				test(
+					'    - - -',
 
 
-					expect( stringify( viewFragment ) ).to.equal( '<hr></hr>' );
-				} );
+					// Four spaces are interpreted as code block.
+					'<pre><code>- - -</code></pre>',
 
 
-				it( '#2', () => {
-					const viewFragment = dataProcessor.toView( ' * * *' );
+					// Code block will be normalized to ``` representation.
+					'```\n' +
+					'- - -\n' +
+					'```'
+				);
+			} );
+		} );
 
 
-					expect( stringify( viewFragment ) ).to.equal( '<hr></hr>' );
-				} );
+		describe( 'asterisks', () => {
+			it( '#1', () => {
+				test( '***', '<hr></hr>', '* * *' );
+			} );
 
 
-				it( '#3', () => {
-					const viewFragment = dataProcessor.toView( '  * * *' );
+			it( '#2', () => {
+				test( ' ***', '<hr></hr>', '* * *' );
+			} );
 
 
-					expect( stringify( viewFragment ) ).to.equal( '<hr></hr>' );
-				} );
+			it( '#3', () => {
+				test( '  ***', '<hr></hr>', '* * *' );
+			} );
 
 
-				it( '#4', () => {
-					const viewFragment = dataProcessor.toView( '   * * *' );
+			it( '#4', () => {
+				test( '   ***', '<hr></hr>', '* * *' );
+			} );
 
 
-					expect( stringify( viewFragment ) ).to.equal( '<hr></hr>' );
-				} );
+			it( '#5 - code', () => {
+				test(
+					'    ***',
 
 
-				it( '#5 - code', () => {
-					const viewFragment = dataProcessor.toView( '	* * *' );
+					// Four spaces are interpreted as code block.
+					'<pre><code>***</code></pre>',
 
 
-					expect( stringify( viewFragment ) ).to.equal( '<pre><code>* * *</code></pre>' );
-				} );
+					// Code block will be normalized to ``` representation.
+					'```\n' +
+					'***\n' +
+					'```'
+				);
 			} );
 			} );
+		} );
 
 
-			describe( 'underscores', () => {
-				it( '#1', () => {
-					const viewFragment = dataProcessor.toView( '___' );
-
-					expect( stringify( viewFragment ) ).to.equal( '<hr></hr>' );
-				} );
-
-				it( '#2', () => {
-					const viewFragment = dataProcessor.toView( ' ___' );
+		describe( 'asterisks with spaces', () => {
+			it( '#1', () => {
+				test( '* * *', '<hr></hr>', '* * *' );
+			} );
 
 
-					expect( stringify( viewFragment ) ).to.equal( '<hr></hr>' );
-				} );
+			it( '#2', () => {
+				test( ' * * *', '<hr></hr>', '* * *' );
+			} );
 
 
-				it( '#3', () => {
-					const viewFragment = dataProcessor.toView( '  ___' );
+			it( '#3', () => {
+				test( '  * * *', '<hr></hr>', '* * *' );
+			} );
 
 
-					expect( stringify( viewFragment ) ).to.equal( '<hr></hr>' );
-				} );
+			it( '#4', () => {
+				test( '   * * *', '<hr></hr>', '* * *' );
+			} );
 
 
-				it( '#4', () => {
-					const viewFragment = dataProcessor.toView( '   ___' );
+			it( '#5 - code', () => {
+				test(
+					'    * * *',
 
 
-					expect( stringify( viewFragment ) ).to.equal( '<hr></hr>' );
-				} );
+					// Four spaces are interpreted as code block.
+					'<pre><code>* * *</code></pre>',
 
 
-				it( '#5 - code', () => {
-					const viewFragment = dataProcessor.toView( '	___' );
+					// Code block will be normalized to ``` representation.
+					'```\n' +
+					'* * *\n' +
+					'```'
+				);
+			} );
+		} );
 
 
-					expect( stringify( viewFragment ) ).to.equal( '<pre><code>___</code></pre>' );
-				} );
+		describe( 'underscores', () => {
+			it( '#1', () => {
+				test( '___', '<hr></hr>', '* * *' );
 			} );
 			} );
 
 
-			describe( 'underscores with spaces', () => {
-				it( '#1', () => {
-					const viewFragment = dataProcessor.toView( '_ _ _' );
+			it( '#2', () => {
+				test( ' ___', '<hr></hr>', '* * *' );
+			} );
 
 
-					expect( stringify( viewFragment ) ).to.equal( '<hr></hr>' );
-				} );
+			it( '#3', () => {
+				test( '  ___', '<hr></hr>', '* * *' );
+			} );
 
 
-				it( '#2', () => {
-					const viewFragment = dataProcessor.toView( ' _ _ _' );
+			it( '#4', () => {
+				test( '   ___', '<hr></hr>', '* * *' );
+			} );
 
 
-					expect( stringify( viewFragment ) ).to.equal( '<hr></hr>' );
-				} );
+			it( '#5 - code', () => {
+				test(
+					'    ___',
 
 
-				it( '#3', () => {
-					const viewFragment = dataProcessor.toView( '  _ _ _' );
+					// Four spaces are interpreted as code block.
+					'<pre><code>___</code></pre>',
 
 
-					expect( stringify( viewFragment ) ).to.equal( '<hr></hr>' );
-				} );
+					// Code block will be normalized to ``` representation.
+					'```\n' +
+					'___\n' +
+					'```'
+				);
+			} );
+		} );
 
 
-				it( '#4', () => {
-					const viewFragment = dataProcessor.toView( '   _ _ _' );
+		describe( 'underscores with spaces', () => {
+			it( '#1', () => {
+				test( '_ _ _', '<hr></hr>', '* * *' );
+			} );
 
 
-					expect( stringify( viewFragment ) ).to.equal( '<hr></hr>' );
-				} );
+			it( '#2', () => {
+				test( ' _ _ _', '<hr></hr>', '* * *' );
+			} );
 
 
-				it( '#5 - code', () => {
-					const viewFragment = dataProcessor.toView( '	_ _ _' );
+			it( '#3', () => {
+				test( '  _ _ _', '<hr></hr>', '* * *' );
+			} );
 
 
-					expect( stringify( viewFragment ) ).to.equal( '<pre><code>_ _ _</code></pre>' );
-				} );
+			it( '#4', () => {
+				test( '   _ _ _', '<hr></hr>', '* * *' );
 			} );
 			} );
-		} );
 
 
-		describe( 'toData', () => {
-			it( 'should process horizontal rules', () => {
-				const viewFragment = new DocumentFragment();
-				viewFragment.appendChildren( parse( '<hr></hr>' ) );
+			it( '#5 - code', () => {
+				test(
+					'    _ _ _',
+
+					// Four spaces are interpreted as code block.
+					'<pre><code>_ _ _</code></pre>',
 
 
-				expect( dataProcessor.toData( viewFragment ) ).to.equal( '* * *' );
+					// Code block will be normalized to ``` representation.
+					'```\n' +
+					'_ _ _\n' +
+					'```'
+				);
 			} );
 			} );
 		} );
 		} );
 	} );
 	} );

+ 47 - 125
packages/ckeditor5-markdown-gfm/tests/gfmdataprocessor/images.js

@@ -3,148 +3,70 @@
  * For licensing, see LICENSE.md.
  * For licensing, see LICENSE.md.
  */
  */
 
 
-import MarkdownDataProcessor from '/ckeditor5/markdown-gfm/gfmdataprocessor.js';
-import DocumentFragment from '/ckeditor5/engine/view/documentfragment.js';
-import { stringify, parse } from '/tests/engine/_utils/view.js';
+import { testDataProcessor as test } from '/tests/markdown-gfm/_utils/utils.js';
 
 
 describe( 'GFMDataProcessor', () => {
 describe( 'GFMDataProcessor', () => {
-	let dataProcessor;
-
-	beforeEach( () => {
-		dataProcessor = new MarkdownDataProcessor();
-	} );
-
 	describe( 'images', () => {
 	describe( 'images', () => {
-		describe( 'toView', () => {
-			it( 'should process images', () => {
-				const viewFragment = dataProcessor.toView( '![alt text](http://example.com/image.png "title text")' );
-
-				expect( stringify( viewFragment ) ).to.equal(
-					'<p>' +
-						'<img alt="alt text" src="http://example.com/image.png" title="title text"></img>' +
-					'</p>'
-				);
-			} );
-
-			it( 'should process images without title', () => {
-				const viewFragment = dataProcessor.toView( '![alt text](http://example.com/image.png)' );
-
-				expect( stringify( viewFragment ) ).to.equal(
-					'<p>' +
-					'<img alt="alt text" src="http://example.com/image.png"></img>' +
-					'</p>'
-				);
-			} );
-
-			it( 'should process images without alt text', () => {
-				const viewFragment = dataProcessor.toView( '![](http://example.com/image.png "title text")' );
-
-				expect( stringify( viewFragment ) ).to.equal(
-					'<p>' +
-					'<img alt="" src="http://example.com/image.png" title="title text"></img>' +
-					'</p>'
-				);
-			} );
-
-			it( 'should process referenced images', () => {
-				const viewFragment = dataProcessor.toView(
-					'![alt text][logo]\n' +
-					'[logo]: http://example.com/image.png "title text"'
-				);
+		it( 'should process images', () => {
+			test(
+				'![alt text](http://example.com/image.png "title text")',
 
 
-				expect( stringify( viewFragment ) ).to.equal(
-					'<p>' +
-					'<img alt="alt text" src="http://example.com/image.png" title="title text"></img>' +
-					'</p>'
-				);
-			} );
+				// GitHub is rendering as:
+				// <p><a href="..." target="_blank"><img src="..." alt="..." title="..." data-canonical-src="..."></a></p>
+				// We will handle images separately by features.
+				'<p><img alt="alt text" src="http://example.com/image.png" title="title text"></img></p>'
 
 
-			it( 'should process referenced images without title', () => {
-				const viewFragment = dataProcessor.toView(
-					'![alt text][logo]\n' +
-					'[logo]: http://example.com/image.png'
-				);
-
-				expect( stringify( viewFragment ) ).to.equal(
-					'<p>' +
-					'<img alt="alt text" src="http://example.com/image.png"></img>' +
-					'</p>'
-				);
-			} );
-
-			it( 'should process referenced images without alt text', () => {
-				const viewFragment = dataProcessor.toView(
-					'![][logo]\n' +
-					'[logo]: http://example.com/image.png "title text"'
-				);
-
-				expect( stringify( viewFragment ) ).to.equal(
-					'<p>' +
-					'<img alt="" src="http://example.com/image.png" title="title text"></img>' +
-					'</p>'
-				);
-			} );
-
-			it( 'should process referenced images without alt text and title', () => {
-				const viewFragment = dataProcessor.toView(
-					'![][logo]\n' +
-					'[logo]: http://example.com/image.png'
-				);
+			);
+		} );
 
 
-				expect( stringify( viewFragment ) ).to.equal(
-					'<p>' +
-					'<img alt="" src="http://example.com/image.png"></img>' +
-					'</p>'
-				);
-			} );
+		it( 'should process images without title', () => {
+			test(
+				'![alt text](http://example.com/image.png)',
+				'<p><img alt="alt text" src="http://example.com/image.png"></img></p>'
+			);
 		} );
 		} );
 
 
-		describe( 'toData', () => {
-			let viewFragment;
+		it( 'should process images without alt text', () => {
+			test(
+				'![](http://example.com/image.png "title text")',
+				'<p><img alt="" src="http://example.com/image.png" title="title text"></img></p>'
+			);
+		} );
 
 
-			beforeEach( () => {
-				viewFragment = new DocumentFragment();
-			} );
+		it( 'should process referenced images', () => {
+			test(
+				'![alt text][logo]\n' +
+				'[logo]: http://example.com/image.png "title text"',
 
 
-			it( 'should process image element', () => {
-				viewFragment.appendChildren( parse(
-					'<p>' +
-						'<img alt="alt text" src="http://example.com/image.png" title="title text"></img>' +
-					'</p>'
-				) );
+				'<p><img alt="alt text" src="http://example.com/image.png" title="title text"></img></p>',
 
 
-				expect( dataProcessor.toData( viewFragment ) ).to.equal( '![alt text](http://example.com/image.png "title text")' );
-			} );
+				// Referenced images when converting back are converted to direct links.
+				'![alt text](http://example.com/image.png "title text")'
+			);
+		} );
 
 
-			it( 'should process image element without alt text', () => {
-				viewFragment.appendChildren( parse(
-					'<p>' +
-						'<img src="http://example.com/image.png" title="title text"></img>' +
-					'</p>'
-				) );
+		it( 'should process referenced images without title', () => {
+			test(
+				'![alt text][logo]\n' +
+				'[logo]: http://example.com/image.png',
 
 
-				expect( dataProcessor.toData( viewFragment ) ).to.equal( '![](http://example.com/image.png "title text")' );
-			} );
+				'<p><img alt="alt text" src="http://example.com/image.png"></img></p>',
 
 
-			it( 'should process image element without title', () => {
-				viewFragment.appendChildren( parse(
-					'<p>' +
-					'<img alt="alt text" src="http://example.com/image.png"></img>' +
-					'</p>'
-				) );
+				// Referenced images when converting back are converted to direct links.
+				'![alt text](http://example.com/image.png)'
+			);
+		} );
 
 
-				expect( dataProcessor.toData( viewFragment ) ).to.equal( '![alt text](http://example.com/image.png)' );
-			} );
+		it( 'should process referenced images without alt text', () => {
+			test(
+				'![][logo]\n' +
+				'[logo]: http://example.com/image.png "title text"',
 
 
-			it( 'should process image element without title and alt text', () => {
-				viewFragment.appendChildren( parse(
-					'<p>' +
-					'<img src="http://example.com/image.png"></img>' +
-					'</p>'
-				) );
+				'<p><img alt="" src="http://example.com/image.png" title="title text"></img></p>',
 
 
-				expect( dataProcessor.toData( viewFragment ) ).to.equal( '![](http://example.com/image.png)' );
-			} );
+				// Referenced images when converting back are converted to direct links.
+				'![](http://example.com/image.png "title text")'
+			);
 		} );
 		} );
 	} );
 	} );
 } );
 } );

+ 344 - 340
packages/ckeditor5-markdown-gfm/tests/gfmdataprocessor/links.js

@@ -3,422 +3,426 @@
  * For licensing, see LICENSE.md.
  * For licensing, see LICENSE.md.
  */
  */
 
 
-import MarkdownDataProcessor from '/ckeditor5/markdown-gfm/gfmdataprocessor.js';
-import DocumentFragment from '/ckeditor5/engine/view/documentfragment.js';
-import { stringify, parse } from '/tests/engine/_utils/view.js';
+import { testDataProcessor as test } from '/tests/markdown-gfm/_utils/utils.js';
 
 
 describe( 'GFMDataProcessor', () => {
 describe( 'GFMDataProcessor', () => {
-	let dataProcessor;
-
-	beforeEach( () => {
-		dataProcessor = new MarkdownDataProcessor();
-	} );
-
 	describe( 'links', () => {
 	describe( 'links', () => {
-		describe( 'toView', () => {
-			it( 'should autolink', () => {
-				const viewFragment = dataProcessor.toView( 'Link: <http://example.com/>.' );
+		it( 'should autolink', () => {
+			test(
+				'Link: <http://example.com/>.',
+				'<p>Link: <a href="http://example.com/">http://example.com/</a>.</p>',
+
+				// When converting back it will be represented as standard markdown link.
+				'Link: [http://example.com/](http://example.com/).'
+			);
+		} );
 
 
-				expect( stringify( viewFragment ) ).to.equal( '<p>Link: <a href="http://example.com/">http://example.com/</a>.</p>' );
-			} );
+		it( 'should autolink #2', () => {
+			test(
+				'Link: http://example.com/.',
+				'<p>Link: <a href="http://example.com/">http://example.com/</a>.</p>',
 
 
-			it( 'should autolink #2', () => {
-				const viewFragment = dataProcessor.toView( 'Link: http://example.com/.' );
+				// When converting back it will be represented as standard markdown link.
+				'Link: [http://example.com/](http://example.com/).'
+			);
+		} );
+
+		it( 'should autolink with params', () => {
+			test(
+				'Link: <http://example.com/?foo=1&bar=2>.',
+				'<p>Link: <a href="http://example.com/?foo=1&bar=2">http://example.com/?foo=1&bar=2</a>.</p>',
 
 
-				expect( stringify( viewFragment ) ).to.equal( '<p>Link: <a href="http://example.com/">http://example.com/</a>.</p>' );
-			} );
+				// When converting back it will be represented as standard markdown link.
+				'Link: [http://example.com/?foo=1&bar=2](http://example.com/?foo=1&bar=2).'
+			);
+		} );
 
 
-			it( 'should autolink with params', () => {
-				const viewFragment = dataProcessor.toView( 'Link: <http://example.com/?foo=1&bar=2>.' );
+		it( 'should autolink inside list', () => {
+			test(
+				'* <http://example.com/>',
 
 
-				expect( stringify( viewFragment ) ).to.equal(
-					'<p>Link: <a href="http://example.com/?foo=1&bar=2">http://example.com/?foo=1&bar=2</a>.</p>'
-				);
-			} );
+				'<ul><li><a href="http://example.com/">http://example.com/</a></li></ul>',
 
 
-			it( 'should autolink inside list', () => {
-				const viewFragment = dataProcessor.toView( '* <http://example.com/>' );
+				// When converting back it will be represented as standard markdown link.
+				'*   [http://example.com/](http://example.com/)'
+			);
+		} );
 
 
-				expect( stringify( viewFragment ) ).to.equal(
-					'<ul>' +
-						'<li><a href="http://example.com/">http://example.com/</a></li>' +
-					'</ul>'
-				);
-			} );
+		it( 'should autolink inside blockquote', () => {
+			test(
+				'> Blockquoted: <http://example.com/>',
 
 
-			it( 'should autolink inside blockquote', () => {
-				const viewFragment = dataProcessor.toView( '> Blockquoted: <http://example.com/>' );
+				'<blockquote>' +
+				'<p>Blockquoted: <a href="http://example.com/">http://example.com/</a></p>' +
+				'</blockquote>',
 
 
-				expect( stringify( viewFragment ) ).to.equal(
-					'<blockquote>' +
-						'<p>Blockquoted: <a href="http://example.com/">http://example.com/</a></p>' +
-					'</blockquote>'
-				);
-			} );
+				// When converting back it will be represented as standard markdown link.
+				'> Blockquoted: [http://example.com/](http://example.com/)'
+			);
+		} );
 
 
-			it( 'should not autolink inside inline code', () => {
-				const viewFragment = dataProcessor.toView( '`<http://example.com/>`' );
+		it( 'should not autolink inside inline code', () => {
+			test(
+				'`<http://example.com/>`',
+				'<p><code><http://example.com/></code></p>'
+			);
+		} );
 
 
-				expect( stringify( viewFragment ) ).to.equal( '<p><code><http://example.com/></code></p>' );
-			} );
+		it( 'should not autolink inside code block', () => {
+			test(
+				'	<http://example.com/>',
+				'<pre><code><http://example.com/></code></pre>',
 
 
-			it( 'should not autolink inside code block', () => {
-				const viewFragment = dataProcessor.toView( '	<http://example.com/>' );
+				// When converting back, code block will be normalized to ```.
+				'```\n' +
+				'<http://example.com/>\n' +
+				'```'
+			);
+		} );
 
 
-				expect( stringify( viewFragment ) ).to.equal( '<pre><code><http://example.com/></code></pre>' );
-			} );
+		it( 'should not process already linked #1', () => {
+			test(
+				'Already linked: [http://example.com/](http://example.com/)',
+				'<p>Already linked: <a href="http://example.com/">http://example.com/</a></p>'
+			);
+		} );
 
 
-			it( 'should not process already linked #1', () => {
-				const viewFragment = dataProcessor.toView( 'Already linked: <a href="http://example.com/">http://example.com/</a>' );
+		it( 'should not process already linked #2', () => {
+			test(
+				'Already linked: [**http://example.com/**](http://example.com/)',
+				'<p>Already linked: <a href="http://example.com/"><strong>http://example.com/</strong></a></p>'
+			);
+		} );
 
 
-				expect( stringify( viewFragment ) ).to.equal( '<p>Already linked: <a href="http://example.com/">http://example.com/</a></p>' );
-			} );
+		it( 'should process inline links', () => {
+			test(
+				'[URL](/url/)',
+				'<p><a href="/url/">URL</a></p>'
+			);
+		} );
 
 
-			it( 'should not process already linked #2', () => {
-				const viewFragment = dataProcessor.toView( 'Already linked: [http://example.com/](http://example.com/)' );
+		it( 'should process inline links with title', () => {
+			test(
+				'[URL and title](/url/ "title")',
+				'<p><a href="/url/" title="title">URL and title</a></p>'
+			);
+		} );
 
 
-				expect( stringify( viewFragment ) ).to.equal( '<p>Already linked: <a href="http://example.com/">http://example.com/</a></p>' );
-			} );
+		it( 'should process inline links with title preceded by two spaces', () => {
+			test(
+				'[URL and title](/url/  "title preceded by two spaces")',
+				'<p><a href="/url/" title="title preceded by two spaces">URL and title</a></p>',
 
 
-			it( 'should not process already linked #3', () => {
-				const viewFragment = dataProcessor.toView( 'Already linked: <a href="http://example.com/">**http://example.com/**</a>' );
+				// When converting back spaces will be normalized to one space.
+				'[URL and title](/url/ "title preceded by two spaces")'
+			);
+		} );
 
 
-				expect( stringify( viewFragment ) ).to.equal(
-					'<p>Already linked: <a href="http://example.com/"><strong>http://example.com/</strong></a></p>'
-				);
-			} );
+		it( 'should process inline links with title preceded by tab', () => {
+			test(
+				'[URL and title](/url/	"title preceded by tab")',
+				'<p><a href="/url/" title="title preceded by tab">URL and title</a></p>',
 
 
-			it( 'should process inline links', () => {
-				const viewFragment = dataProcessor.toView( '[URL](/url/)' );
+				// When converting back tab will be normalized to one space.
+				'[URL and title](/url/ "title preceded by tab")'
+			);
+		} );
 
 
-				expect( stringify( viewFragment ) ).to.equal( '<p><a href="/url/">URL</a></p>' );
-			} );
+		it( 'should process inline links with title that has spaces afterwards', () => {
+			test(
+				'[URL and title](/url/ "title has spaces afterward"  )',
+				'<p><a href="/url/" title="title has spaces afterward">URL and title</a></p>',
 
 
-			it( 'should process inline links with title', () => {
-				const viewFragment = dataProcessor.toView( '[URL and title](/url/ "title")' );
+				// When converting back spaces will be removed.
+				'[URL and title](/url/ "title has spaces afterward")'
+			);
+		} );
 
 
-				expect( stringify( viewFragment ) ).to.equal( '<p><a href="/url/" title="title">URL and title</a></p>' );
-			} );
+		it( 'should process inline links with spaces in URL', () => {
+			test(
+				'[URL and title]( /url/has space )',
+				'<p><a href="/url/has space">URL and title</a></p>',
 
 
-			it( 'should process inline links with title preceded by two spaces', () => {
-				const viewFragment = dataProcessor.toView( '[URL and title](/url/  "title preceded by two spaces")' );
+				// When converting back unneeded spaces will be removed.
+				'[URL and title](/url/has space)'
+			);
+		} );
 
 
-				expect( stringify( viewFragment ) ).to.equal( '<p><a href="/url/" title="title preceded by two spaces">URL and title</a></p>' );
-			} );
+		it( 'should process inline links with titles and spaces in URL', () => {
+			test(
+				'[URL and title]( /url/has space/ "url has space and title")',
+				'<p><a href="/url/has space/" title="url has space and title">URL and title</a></p>',
 
 
-			it( 'should process inline links with title preceded by tab', () => {
-				const viewFragment = dataProcessor.toView( '[URL and title](/url/	"title preceded by tab")' );
+				// When converting back unneeded spaces will be removed.
+				'[URL and title](/url/has space/ "url has space and title")'
+			);
+		} );
 
 
-				expect( stringify( viewFragment ) ).to.equal( '<p><a href="/url/" title="title preceded by tab">URL and title</a></p>' );
-			} );
+		it( 'should process empty link', () => {
+			test(
+				'[Empty]()',
 
 
-			it( 'should process inline links with title that has spaces afterwards', () => {
-				const viewFragment = dataProcessor.toView( '[URL and title](/url/ "title has spaces afterward"  )' );
+				'<p><a href="">Empty</a></p>'
+			);
+		} );
 
 
-				expect( stringify( viewFragment ) ).to.equal( '<p><a href="/url/" title="title has spaces afterward">URL and title</a></p>' );
-			} );
+		it( 'should process reference links', () => {
+			test(
+				'Foo [bar] [1].\n' +
+				'[1]: /url/  "Title"',
 
 
-			it( 'should process inline links with spaces in URL', () => {
-				const viewFragment = dataProcessor.toView( '[URL and title]( /url/has space )' );
+				'<p>Foo <a href="/url/" title="Title">bar</a>.</p>',
 
 
-				expect( stringify( viewFragment ) ).to.equal( '<p><a href="/url/has space">URL and title</a></p>' );
-			} );
+				// After converting back reference links will be converted to normal links.
+				// This might be a problem when switching between source and editor.
+				'Foo [bar](/url/ "Title").'
+			);
+		} );
 
 
-			it( 'should process inline links with titles and spaces in URL', () => {
-				const viewFragment = dataProcessor.toView( '[URL and title]( /url/has space/ "url has space and title")' );
+		it( 'should process reference links - without space', () => {
+			test(
+				'Foo [bar][1].\n' +
+				'[1]: /url/  "Title"',
 
 
-				expect( stringify( viewFragment ) ).to.equal( '<p><a href="/url/has space/" title="url has space and title">URL and title</a></p>' );
-			} );
+				'<p>Foo <a href="/url/" title="Title">bar</a>.</p>',
 
 
-			it( 'should process empty link', () => {
-				const viewFragment = dataProcessor.toView( '[Empty]()' );
+				'Foo [bar](/url/ "Title").'
+			);
+		} );
 
 
-				expect( stringify( viewFragment ) ).to.equal( '<p><a href="">Empty</a></p>' );
-			} );
+		it( 'should process reference links - with newline', () => {
+			test(
+				'Foo [bar]\n' +
+				'[1].\n' +
+				'[1]: /url/  "Title"',
 
 
-			it( 'should process reference links', () => {
-				const viewFragment = dataProcessor.toView(
-					'Foo [bar] [1].\n' +
-					'[1]: /url/  "Title"'
-				);
+				'<p>Foo <a href="/url/" title="Title">bar</a>.</p>',
 
 
-				expect( stringify( viewFragment ) ).to.equal( '<p>Foo <a href="/url/" title="Title">bar</a>.</p>' );
-			} );
+				'Foo [bar](/url/ "Title").'
+			);
+		} );
 
 
-			it( 'should process reference links - without space', () => {
-				const viewFragment = dataProcessor.toView(
-					'Foo [bar][1].\n' +
-					'[1]: /url/  "Title"'
-				);
+		it( 'should process reference links - with embedded brackets', () => {
+			test(
+				'With [embedded [brackets]] [b].\n' +
+				'[b]: /url/',
 
 
-				expect( stringify( viewFragment ) ).to.equal( '<p>Foo <a href="/url/" title="Title">bar</a>.</p>' );
-			} );
+				'<p>With <a href="/url/">embedded [brackets]</a>.</p>',
 
 
-			it( 'should process reference links - with newline', () => {
-				const viewFragment = dataProcessor.toView(
-					'Foo [bar]\n[1].\n' +
-					'[1]: /url/  "Title"'
-				);
+				'With [embedded [brackets]](/url/).'
+			);
+		} );
 
 
-				expect( stringify( viewFragment ) ).to.equal( '<p>Foo <a href="/url/" title="Title">bar</a>.</p>' );
-			} );
+		it( 'should process reference links - with reference indented once', () => {
+			test(
+				'Indented [once][].\n' +
+				' [once]: /url',
 
 
-			it( 'should process reference links - with embedded brackets', () => {
-				const viewFragment = dataProcessor.toView(
-					'With [embedded [brackets]] [b].\n' +
-					'[b]: /url/'
-				);
+				'<p>Indented <a href="/url">once</a>.</p>',
 
 
-				expect( stringify( viewFragment ) ).to.equal( '<p>With <a href="/url/">embedded [brackets]</a>.</p>' );
-			} );
+				'Indented [once](/url).'
+			);
+		} );
 
 
-			it( 'should process reference links - with reference indented once', () => {
-				const viewFragment = dataProcessor.toView(
-					'Indented [once][].\n' +
-					' [once]: /url'
-				);
+		it( 'should process reference links - with reference indented twice', () => {
+			test(
+				'Indented [twice][].\n' +
+				'  [twice]: /url',
 
 
-				expect( stringify( viewFragment ) ).to.equal( '<p>Indented <a href="/url">once</a>.</p>' );
-			} );
+				'<p>Indented <a href="/url">twice</a>.</p>',
 
 
-			it( 'should process reference links - with reference indented twice', () => {
-				const viewFragment = dataProcessor.toView(
-					'Indented [twice][].\n' +
-					'  [twice]: /url'
-				);
+				'Indented [twice](/url).'
+			);
+		} );
 
 
-				expect( stringify( viewFragment ) ).to.equal( '<p>Indented <a href="/url">twice</a>.</p>' );
-			} );
+		it( 'should process reference links - with reference indented three times', () => {
+			test(
+				'Indented [trice][].\n' +
+				'   [trice]: /url',
 
 
-			it( 'should process reference links - with reference indented trice', () => {
-				const viewFragment = dataProcessor.toView(
-					'Indented [trice][].\n' +
-					'   [trice]: /url'
-				);
+				'<p>Indented <a href="/url">trice</a>.</p>',
 
 
-				expect( stringify( viewFragment ) ).to.equal( '<p>Indented <a href="/url">trice</a>.</p>' );
-			} );
+				'Indented [trice](/url).'
+			);
+		} );
 
 
-			it( 'should NOT process reference links - with reference indented four times', () => {
-				const viewFragment = dataProcessor.toView(
-					'Indented [four][] times.\n' +
-					'    [four]: /url'
-				);
+		it( 'should NOT process reference links - with reference indented four times', () => {
+			test(
+				'Indented [four][].\n' +
+				'    [four]: /url',
 
 
 				// GitHub renders it as:
 				// GitHub renders it as:
-				// <p>Indented [four][] times.<br>[four]: /url</p>
-				expect( stringify( viewFragment ) ).to.equal( '<p>Indented [four][] times.</p><pre><code>[four]: /url</code></pre>' );
-			} );
-
-			it( 'should process reference links when title and reference are same #1', () => {
-				const viewFragment = dataProcessor.toView(
-					'[this] [this]\n' +
-					'[this]: foo'
-				);
-
-				expect( stringify( viewFragment ) ).to.equal( '<p><a href="foo">this</a></p>' );
-			} );
-
-			it( 'should process reference links when title and reference are same #2', () => {
-				const viewFragment = dataProcessor.toView(
-					'[this][this]\n' +
-					'[this]: foo'
-				);
-
-				expect( stringify( viewFragment ) ).to.equal( '<p><a href="foo">this</a></p>' );
-			} );
-
-			it( 'should process reference links when only title is provided and is same as reference #1', () => {
-				const viewFragment = dataProcessor.toView(
-					'[this] []\n' +
-					'[this]: foo'
-				);
-
-				expect( stringify( viewFragment ) ).to.equal( '<p><a href="foo">this</a></p>' );
-			} );
-
-			it( 'should process reference links when only title is provided and is same as reference #2', () => {
-				const viewFragment = dataProcessor.toView(
-					'[this][]\n' +
-					'[this]: foo'
-				);
-
-				expect( stringify( viewFragment ) ).to.equal( '<p><a href="foo">this</a></p>' );
-			} );
-
-			it( 'should process reference links when only title is provided and is same as reference #3', () => {
-				const viewFragment = dataProcessor.toView(
-					'[this]\n' +
-					'[this]: foo'
-				);
-
-				expect( stringify( viewFragment ) ).to.equal( '<p><a href="foo">this</a></p>' );
-			} );
-
-			it( 'should not process reference links when reference is not found #1', () => {
-				const viewFragment = dataProcessor.toView(
-					'[this] []'
-				);
-
-				expect( stringify( viewFragment ) ).to.equal( '<p>[this] []</p>' );
-			} );
-
-			it( 'should not process reference links when reference is not found #2', () => {
-				const viewFragment = dataProcessor.toView(
-					'[this][]'
-				);
-
-				expect( stringify( viewFragment ) ).to.equal( '<p>[this][]</p>' );
-			} );
-
-			it( 'should not process reference links when reference is not found #2', () => {
-				const viewFragment = dataProcessor.toView(
-					'[this]'
-				);
-
-				expect( stringify( viewFragment ) ).to.equal( '<p>[this]</p>' );
-			} );
-
-			it( 'should process reference links nested in brackets #1', () => {
-				const viewFragment = dataProcessor.toView(
-					'[a reference inside [this][]]\n' +
-					'[this]: foo'
-				);
-
-				expect( stringify( viewFragment ) ).to.equal( '<p>[a reference inside <a href="foo">this</a>]</p>' );
-			} );
-
-			it( 'should process reference links nested in brackets #2', () => {
-				const viewFragment = dataProcessor.toView(
-					'[a reference inside [this]]\n' +
-					'[this]: foo'
-				);
-
-				expect( stringify( viewFragment ) ).to.equal( '<p>[a reference inside <a href="foo">this</a>]</p>' );
-			} );
-
-			it( 'should not process reference links when title is same as reference but reference is different', () => {
-				const viewFragment = dataProcessor.toView(
-					'[this](/something/else/)\n' +
-					'[this]: foo'
-				);
-
-				expect( stringify( viewFragment ) ).to.equal( '<p><a href="/something/else/">this</a></p>' );
-			} );
-
-			it( 'should not process reference links suppressed by backslashes', () => {
-				const viewFragment = dataProcessor.toView(
-					'Suppress \\[this] and [this\\].\n' +
-					'[this]: foo'
-				);
-
-				expect( stringify( viewFragment ) ).to.equal( '<p>Suppress [this] and [this].</p>' );
-			} );
-
-			it( 'should process reference links when used across multiple lines #1', () => {
-				const viewFragment = dataProcessor.toView(
-					'This is [multiline\nreference]\n' +
-					'[multiline reference]: foo'
-				);
-
-				expect( stringify( viewFragment ) ).to.equal( '<p>This is <a href="foo">multiline<br></br>reference</a></p>' );
-			} );
-
-			it( 'should process reference links when used across multiple lines #2', () => {
-				const viewFragment = dataProcessor.toView(
-					'This is [multiline \nreference]\n' +
-					'[multiline reference]: foo'
-				);
-
-				expect( stringify( viewFragment ) ).to.equal( '<p>This is <a href="foo">multiline<br></br>reference</a></p>' );
-			} );
+				// <p>Indented [four][].<br>
+				// [four]: /url</p>
+				// Marked converts it to the code block.
+				'<p>Indented [four][].</p><pre><code>[four]: /url</code></pre>',
+
+				'Indented [four][].\n' +
+				'\n' +
+				'```\n' +
+				'[four]: /url\n' +
+				'```'
+			);
+		} );
+
+		it( 'should process reference links when title and reference are same #1', () => {
+			test(
+				'[this] [this]\n' +
+				'[this]: foo',
+
+				'<p><a href="foo">this</a></p>',
+
+				'[this](foo)'
+			);
+		} );
+
+		it( 'should process reference links when title and reference are same #2', () => {
+			test(
+				'[this][this]\n' +
+				'[this]: foo',
+
+				'<p><a href="foo">this</a></p>',
+
+				'[this](foo)'
+			);
+		} );
+
+		it( 'should process reference links when only title is provided and is same as reference #1', () => {
+			test(
+				'[this] []\n' +
+				'[this]: foo',
+
+				'<p><a href="foo">this</a></p>',
+
+				'[this](foo)'
+			);
+		} );
+
+		it( 'should process reference links when only title is provided and is same as reference #2', () => {
+			test(
+				'[this][]\n' +
+				'[this]: foo',
+
+				'<p><a href="foo">this</a></p>',
+
+				'[this](foo)'
+			);
+		} );
+
+		it( 'should process reference links when only title is provided and is same as reference #3', () => {
+			test(
+				'[this]\n' +
+				'[this]: foo',
+
+				'<p><a href="foo">this</a></p>',
+
+				'[this](foo)'
+			);
+		} );
+
+		it( 'should not process reference links when reference is not found #1', () => {
+			test(
+				'[this] []',
+
+				'<p>[this] []</p>'
+			);
+		} );
+
+		it( 'should not process reference links when reference is not found #2', () => {
+			test(
+				'[this][]',
+
+				'<p>[this][]</p>'
+			);
+		} );
+
+		it( 'should not process reference links when reference is not found #2', () => {
+			test(
+				'[this]',
 
 
-			it( 'should process reference links case-insensitve', () => {
-				const viewFragment = dataProcessor.toView(
-					'[hi]\n' +
-					'[HI]: /url'
-				);
-
-				expect( stringify( viewFragment ) ).to.equal( '<p><a href="/url">hi</a></p>' );
-			} );
+				'<p>[this]</p>'
+			);
 		} );
 		} );
 
 
-		describe( 'toData', () => {
-			let viewFragment;
+		it( 'should process reference links nested in brackets #1', () => {
+			test(
+				'[a reference inside [this][]]\n' +
+				'[this]: foo',
 
 
-			beforeEach( () => {
-				viewFragment = new DocumentFragment();
-			} );
+				'<p>[a reference inside <a href="foo">this</a>]</p>',
 
 
-			it( 'should process links', () => {
-				viewFragment.appendChildren( parse( '<p>Link: <a href="http://example.com/">http://example.com/</a>.</p>' ) );
+				'[a reference inside [this](foo)]'
+			);
+		} );
+
+		it( 'should process reference links nested in brackets #2', () => {
+			test(
+				'[a reference inside [this]]\n' +
+				'[this]: foo',
 
 
-				expect( dataProcessor.toData( viewFragment ) ).to.equal( 'Link: [http://example.com/](http://example.com/).' );
-			} );
-
-			it( 'should process links with params', () => {
-				viewFragment.appendChildren( parse(
-					'<p>' +
-						'Link: <a href="http://example.com/?foo=1&amp;bar=2">http://example.com/?foo=1&amp;bar=2</a>.' +
-					'</p>'
-				) );
+				'<p>[a reference inside <a href="foo">this</a>]</p>',
+
+				'[a reference inside [this](foo)]'
+			);
+		} );
 
 
-				expect( dataProcessor.toData( viewFragment ) ).to.equal( 'Link: [http://example.com/?foo=1&bar=2](http://example.com/?foo=1&bar=2).' );
-			} );
+		it( 'should not process reference links when title is same as reference but reference is different', () => {
+			test(
+				'[this](/something/else/)\n' +
+				'[this]: foo',
 
 
-			it( 'should process links with titles', () => {
-				viewFragment.appendChildren( parse(
-					'<p>' +
-					'Link: <a href="http://example.com/" title="Link title">example site</a>.' +
-					'</p>'
-				) );
+				'<p><a href="/something/else/">this</a></p>',
 
 
-				expect( dataProcessor.toData( viewFragment ) ).to.equal( 'Link: [example site](http://example.com/ "Link title").' );
-			} );
+				'[this](/something/else/)'
+			);
+		} );
 
 
-			it( 'should process links with spaces in URL', () => {
-				viewFragment.appendChildren( parse(
-					'<p>' +
-					'Link: <a href="url/has space">example</a>.' +
-					'</p>'
-				) );
+		it( 'should not process reference links suppressed by backslashes', () => {
+			test(
+				'Suppress \\[this] and [this\\].\n' +
+				'[this]: foo',
 
 
-				expect( dataProcessor.toData( viewFragment ) ).to.equal( 'Link: [example](url/has space).' );
-			} );
+				'<p>Suppress [this] and [this].</p>',
 
 
-			it( 'should process links with titles and spaces in URL', () => {
-				viewFragment.appendChildren( parse(
-					'<p>' +
-					'Link: <a href="url/has space" title="Link title">example</a>.' +
-					'</p>'
-				) );
+				'Suppress [this] and [this].'
+			);
+		} );
 
 
-				expect( dataProcessor.toData( viewFragment ) ).to.equal( 'Link: [example](url/has space "Link title").' );
-			} );
+		it( 'should process reference links when used across multiple lines #1', () => {
+			test(
+				'This is [multiline\n' +
+				'reference]\n' +
+				'[multiline reference]: foo',
 
 
-			it( 'should process empty links #1', () => {
-				viewFragment.appendChildren( parse( '<p><a>Empty</a></p>' ) );
+				'<p>This is <a href="foo">multiline<br></br>reference</a></p>',
 
 
-				expect( dataProcessor.toData( viewFragment ) ).to.equal( '[Empty]()' );
-			} );
+				'This is [multiline\n' +
+				'reference](foo)'
+			);
+		} );
 
 
-			it( 'should process empty links #2', () => {
-				viewFragment.appendChildren( parse( '<p><a></a></p>' ) );
+		it( 'should process reference links when used across multiple lines #2', () => {
+			test(
+				'This is [multiline \n' +
+				'reference]\n' +
+				'[multiline reference]: foo',
 
 
-				expect( dataProcessor.toData( viewFragment ) ).to.equal( '[]()' );
-			} );
+				'<p>This is <a href="foo">multiline<br></br>reference</a></p>',
 
 
-			it( 'should process empty links with title #1', () => {
-				viewFragment.appendChildren( parse( '<p><a title="Link Title">Empty</a></p>' ) );
+				'This is [multiline\n' +
+				'reference](foo)'
+			);
+		} );
 
 
-				expect( dataProcessor.toData( viewFragment ) ).to.equal( '[Empty]("Link Title")' );
-			} );
+		it( 'should process reference links case-insensitive', () => {
+			test(
+				'[hi]\n' +
+				'[HI]: /url',
 
 
-			it( 'should process empty links with title #2', () => {
-				viewFragment.appendChildren( parse( '<p><a title="Link Title"></a></p>' ) );
+				'<p><a href="/url">hi</a></p>',
 
 
-				expect( dataProcessor.toData( viewFragment ) ).to.equal( '[]("Link Title")' );
-			} );
+				'[hi](/url)'
+			);
 		} );
 		} );
 	} );
 	} );
 } );
 } );

+ 329 - 254
packages/ckeditor5-markdown-gfm/tests/gfmdataprocessor/lists.js

@@ -3,266 +3,341 @@
  * For licensing, see LICENSE.md.
  * For licensing, see LICENSE.md.
  */
  */
 
 
-import MarkdownDataProcessor from '/ckeditor5/markdown-gfm/gfmdataprocessor.js';
-import DocumentFragment from '/ckeditor5/engine/view/documentfragment.js';
-import { stringify, parse } from '/tests/engine/_utils/view.js';
+import { testDataProcessor as test } from '/tests/markdown-gfm/_utils/utils.js';
 
 
 describe( 'GFMDataProcessor', () => {
 describe( 'GFMDataProcessor', () => {
-	let dataProcessor;
+	describe( 'lists', () => {
+		it( 'should process tight asterisks', () => {
+			test(
+				'*	item 1\n' +
+				'*	item 2\n' +
+				'*	item 3',
+
+				// GitHub renders it as (notice spaces before list items)
+				// <ul>
+				// <li>  item 1</li>
+				// <li>  item 2</li>
+				// <li>  item 3</li>
+				// </ul>
+				'<ul><li>item 1</li><li>item 2</li><li>item 3</li></ul>',
+
+				// List will be normalized to 3-space representation.
+				'*   item 1\n' +
+				'*   item 2\n' +
+				'*   item 3'
+			);
+		} );
 
 
-	beforeEach( () => {
-		dataProcessor = new MarkdownDataProcessor();
-	} );
+		it( 'should process loose asterisks', () => {
+			test(
+				'*	item 1\n' +
+				'\n' +
+				'*	item 2\n' +
+				'\n' +
+				'*	item 3',
+
+				// Loose lists are rendered with with paragraph inside.
+				'<ul>' +
+					'<li>' +
+						'<p>item 1</p>' +
+					'</li>' +
+					'<li>' +
+						'<p>item 2</p>' +
+					'</li>' +
+					'<li>' +
+						'<p>item 3</p>' +
+					'</li>' +
+				'</ul>',
+
+				// List will be normalized to 3-space representation.
+				'*   item 1\n' +
+				'\n' +
+				'*   item 2\n' +
+				'\n' +
+				'*   item 3'
+			);
+		} );
 
 
-	describe( 'lists', () => {
-		describe( 'toView', () => {
-			it( 'should process tight asterisks', () => {
-				const viewFragment = dataProcessor.toView(
-					'*	item 1\n' +
-					'*	item 2\n' +
-					'*	item 3'
-				);
-
-				expect( stringify( viewFragment ) ).to.equal(
-					'<ul>' +
-						'<li>item 1</li>' +
-						'<li>item 2</li>' +
-						'<li>item 3</li>' +
-					'</ul>'
-				);
-			} );
-
-			// it( 'should process loose asterisks', () => {
-			// 	const viewFragment = dataProcessor.toView(
-			// 		'*	item 1\n\n' +
-			// 		'*	item 2\n\n' +
-			// 		'*	item 3'
-			// 	);
-			//
-			// 	expect( stringify( viewFragment ) ).to.equal(
-			// 		'<ul>' +
-			// 			'<li>item 1</li>' +
-			// 			'<li>item 2</li>' +
-			// 			'<li>item 3</li>' +
-			// 		'</ul>'
-			// 	);
-			// } );
-
-			it( 'should process tight pluses', () => {
-				const viewFragment = dataProcessor.toView(
-					'+	item 1\n' +
-					'+	item 2\n' +
-					'+	item 3'
-				);
-
-				expect( stringify( viewFragment ) ).to.equal(
-					'<ul>' +
-						'<li>item 1</li>' +
-						'<li>item 2</li>' +
-						'<li>item 3</li>' +
-					'</ul>'
-				);
-			} );
-
-			// it( 'should process loose pluses', () => {
-			// 	const viewFragment = dataProcessor.toView(
-			// 		'+	item 1\n\n' +
-			// 		'+	item 2\n\n' +
-			// 		'+	item 3'
-			// 	);
-			//
-			// 	expect( stringify( viewFragment ) ).to.equal(
-			// 		'<ul>' +
-			// 			'<li>item 1</li>' +
-			// 			'<li>item 2</li>' +
-			// 			'<li>item 3</li>' +
-			// 		'</ul>' );
-			// } );
-
-			it( 'should process tight minuses', () => {
-				const viewFragment = dataProcessor.toView(
-					'-	item 1\n' +
-					'-	item 2\n' +
-					'-	item 3'
-				);
-
-				expect( stringify( viewFragment ) ).to.equal(
-					'<ul>' +
-						'<li>item 1</li>' +
-						'<li>item 2</li>' +
-						'<li>item 3</li>' +
-					'</ul>'
-				);
-			} );
-
-			// it( 'should process loose minuses', () => {
-			// 	const viewFragment = dataProcessor.toView(
-			// 		'-	item 1\n\n' +
-			// 		'-	item 2\n\n' +
-			// 		'-	item 3' );
-			//
-			// 	expect( stringify( viewFragment ) ).to.equal(
-			// 		'<ul>' +
-			// 			'<li>item 1</li>' +
-			// 			'<li>item 2</li>' +
-			// 			'<li>item 3</li>' +
-			// 		'</ul>' );
-			// } );
-
-			it( 'should process ordered list with tabs', () => {
-				const viewFragment = dataProcessor.toView(
-					'1.	item 1\n' +
-					'2.	item 2\n' +
-					'3.	item 3' );
-
-				expect( stringify( viewFragment ) ).to.equal(
-					'<ol>' +
-						'<li>item 1</li>' +
-						'<li>item 2</li>' +
-						'<li>item 3</li>' +
-					'</ol>'
-				);
-			} );
-
-			it( 'should process ordered list with spaces', () => {
-				const viewFragment = dataProcessor.toView(
-					'1. item 1\n' +
-					'2. item 2\n' +
-					'3. item 3'
-				);
-
-				expect( stringify( viewFragment ) ).to.equal(
-					'<ol>' +
-						'<li>item 1</li>' +
-						'<li>item 2</li>' +
-						'<li>item 3</li>' +
-					'</ol>' );
-			} );
-
-			// it( 'should process loose ordered list with tabs', () => {
-			// 	const viewFragment = dataProcessor.toView(
-			// 		'1.	item 1\n\n' +
-			// 		'2.	item 2\n\n' +
-			// 		'3.	item 3'
-			// 	);
-			//
-			// 	expect( stringify( viewFragment ) ).to.equal(
-			// 		'<ol>' +
-			// 			'<li>item 1</li>' +
-			// 			'<li>item 2</li>' +
-			// 			'<li>item 3</li>' +
-			// 		'</ol>'
-			// 	);
-			// } );
-
-			// it( 'should process loose ordered list with spaces', () => {
-			// 	const viewFragment = dataProcessor.toView(
-			// 		'1. item 1\n\n' +
-			// 		'2. item 2\n\n' +
-			// 		'3. item 3'
-			// 	);
-			//
-			// 	expect( stringify( viewFragment ) ).to.equal(
-			// 		'<ol>' +
-			// 			'<li>item 1</li>' +
-			// 			'<li>item 2</li>' +
-			// 			'<li>item 3</li>' +
-			// 		'</ol>'
-			// 	);
-			// } );
-
-			it( 'should process nested lists', () => {
-				const viewFragment = dataProcessor.toView( '*	Tab\n	*	Tab\n		*	Tab' );
-
-				expect( stringify( viewFragment ) ).to.equal( '<ul><li>Tab<ul><li>Tab<ul><li>Tab</li></ul></li></ul></li></ul>' );
-			} );
-
-			it( 'should process nested and mixed lists', () => {
-				const viewFragment = dataProcessor.toView( '1. First\n2. Second:\n	* Fee\n	* Fie\n	* Foe\n3. Third' );
-
-				expect( stringify( viewFragment ) ).to.equal(
-					'<ol>' +
-						'<li>First</li>' +
-						'<li>Second:' +
-							'<ul>' +
-								'<li>Fee</li>' +
-								'<li>Fie</li>' +
-								'<li>Foe</li>' +
-							'</ul>' +
-						'</li>' +
-						'<li>Third</li>' +
-					'</ol>'
-				);
-			} );
-
-			it( 'should process nested and mixed loose lists', () => {
-				const viewFragment = dataProcessor.toView( '1. First\n\n2. Second:\n	* Fee\n	* Fie\n	* Foe\n\n3. Third' );
-
-				expect( stringify( viewFragment ) ).to.equal(
-					'<ol>' +
-						'<li>' +
-							'<p>First</p>' +
-						'</li>' +
-						'<li>' +
-							'<p>Second:</p>' +
-							'<ul>' +
-								'<li>Fee</li>' +
-								'<li>Fie</li>' +
-								'<li>Foe</li>' +
-							'</ul>' +
-						'</li>' +
-						'<li>' +
-							'<p>Third</p>' +
-						'</li>' +
-					'</ol>'
-				);
-			} );
-
-			it( 'should create same bullet from different list indicators', () => {
-				const viewFragment = dataProcessor.toView( '* test\n+ test\n- test' );
-
-				expect( stringify( viewFragment ) ).to.equal( '<ul><li>test</li><li>test</li><li>test</li></ul>' );
-			} );
+		it( 'should process tight pluses', () => {
+			test(
+				'+	item 1\n' +
+				'+	item 2\n' +
+				'+	item 3',
+
+				'<ul>' +
+					'<li>item 1</li>' +
+					'<li>item 2</li>' +
+					'<li>item 3</li>' +
+				'</ul>',
+
+				// List will be normalized to asterisks, 3-space representation.
+				'*   item 1\n' +
+				'*   item 2\n' +
+				'*   item 3'
+			);
+		} );
+
+		it( 'should process loose pluses', () => {
+			test(
+				'+	item 1\n' +
+				'\n' +
+				'+	item 2\n' +
+				'\n' +
+				'+	item 3',
+
+				'<ul>' +
+					'<li>' +
+						'<p>item 1</p>' +
+					'</li>' +
+					'<li>' +
+						'<p>item 2</p>' +
+					'</li>' +
+					'<li>' +
+						'<p>item 3</p>' +
+					'</li>' +
+				'</ul>',
+
+				// List will be normalized to asterisks, 3-space representation.
+				'*   item 1\n' +
+				'\n' +
+				'*   item 2\n' +
+				'\n' +
+				'*   item 3'
+			);
+		} );
+
+		it( 'should process tight minuses', () => {
+			test(
+				'-	item 1\n' +
+				'-	item 2\n' +
+				'-	item 3',
+
+				'<ul>' +
+					'<li>item 1</li>' +
+					'<li>item 2</li>' +
+					'<li>item 3</li>' +
+				'</ul>',
+
+				// List will be normalized to asterisks, 3-space representation.
+				'*   item 1\n' +
+				'*   item 2\n' +
+				'*   item 3'
+			);
+		} );
+
+		it( 'should process loose minuses', () => {
+			test(
+				'-	item 1\n' +
+				'\n' +
+				'-	item 2\n' +
+				'\n' +
+				'-	item 3' ,
+
+				'<ul>' +
+					'<li>' +
+						'<p>item 1</p>' +
+					'</li>' +
+					'<li>' +
+						'<p>item 2</p>' +
+					'</li>' +
+					'<li>' +
+						'<p>item 3</p>' +
+					'</li>' +
+				'</ul>',
+
+				// List will be normalized to asterisks, 3-space representation.
+				'*   item 1\n' +
+				'\n' +
+				'*   item 2\n' +
+				'\n' +
+				'*   item 3'
+			);
+		} );
+
+		it( 'should process ordered list with tabs', () => {
+			test(
+				'1.	item 1\n' +
+				'2.	item 2\n' +
+				'3.	item 3',
+
+				'<ol>' +
+					'<li>item 1</li>' +
+					'<li>item 2</li>' +
+					'<li>item 3</li>' +
+				'</ol>',
+
+				// List will be normalized to 2-space representation.
+				'1.  item 1\n' +
+				'2.  item 2\n' +
+				'3.  item 3'
+			);
+		} );
+
+		it( 'should process ordered list with spaces', () => {
+			test(
+				'1. item 1\n' +
+				'2. item 2\n' +
+				'3. item 3',
+
+				'<ol>' +
+					'<li>item 1</li>' +
+					'<li>item 2</li>' +
+					'<li>item 3</li>' +
+				'</ol>',
+
+				// List will be normalized to 2-space representation.
+				'1.  item 1\n' +
+				'2.  item 2\n' +
+				'3.  item 3'
+			);
+		} );
+
+		it( 'should process loose ordered list with tabs', () => {
+			test(
+				'1.	item 1\n' +
+				'\n' +
+				'2.	item 2\n' +
+				'\n' +
+				'3.	item 3',
+
+				'<ol>' +
+					'<li>' +
+						'<p>item 1</p>' +
+					'</li>' +
+					'<li>' +
+						'<p>item 2</p>' +
+					'</li>' +
+					'<li>' +
+						'<p>item 3</p>' +
+					'</li>' +
+				'</ol>',
+
+				// List will be normalized to 2-space representation.
+				'1.  item 1\n' +
+				'\n' +
+				'2.  item 2\n' +
+				'\n' +
+				'3.  item 3'
+			);
+		} );
+
+		it( 'should process loose ordered list with spaces', () => {
+			test(
+				'1. item 1\n' +
+				'\n' +
+				'2. item 2\n' +
+				'\n' +
+				'3. item 3',
+
+				'<ol>' +
+					'<li>' +
+						'<p>item 1</p>' +
+					'</li>' +
+					'<li>' +
+						'<p>item 2</p>' +
+					'</li>' +
+					'<li>' +
+						'<p>item 3</p>' +
+					'</li>' +
+				'</ol>',
+
+				// List will be normalized to 2-space representation.
+				'1.  item 1\n' +
+				'\n' +
+				'2.  item 2\n' +
+				'\n' +
+				'3.  item 3'
+			);
+		} );
+
+		it( 'should process nested and mixed lists', () => {
+			test(
+				'1. First\n' +
+				'2. Second:\n' +
+				'	* Fee\n' +
+				'	* Fie\n' +
+				'	* Foe\n' +
+				'3. Third',
+
+				'<ol>' +
+					'<li>First</li>' +
+					'<li>Second:' +
+						'<ul>' +
+							'<li>Fee</li>' +
+							'<li>Fie</li>' +
+							'<li>Foe</li>' +
+						'</ul>' +
+					'</li>' +
+					'<li>Third</li>' +
+				'</ol>',
+
+				// All lists will be normalized after converting back.
+				'1.  First\n' +
+				'2.  Second:\n' +
+				'    *   Fee\n' +
+				'    *   Fie\n' +
+				'    *   Foe\n' +
+				'3.  Third'
+			);
+		} );
+
+		it( 'should process nested and mixed loose lists', () => {
+			test(
+				'1. First\n' +
+				'\n' +
+				'2. Second:\n' +
+				'	* Fee\n' +
+				'	* Fie\n' +
+				'	* Foe\n' +
+				'\n' +
+				'3. Third',
+
+				'<ol>' +
+					'<li>' +
+						'<p>First</p>' +
+					'</li>' +
+					'<li>' +
+						'<p>Second:</p>' +
+						'<ul>' +
+							'<li>Fee</li>' +
+							'<li>Fie</li>' +
+							'<li>Foe</li>' +
+						'</ul>' +
+					'</li>' +
+					'<li>' +
+						'<p>Third</p>' +
+					'</li>' +
+				'</ol>',
+
+				// All lists will be normalized after converting back.
+				'1.  First\n' +
+				'\n' +
+				'2.  Second:\n' +
+				'\n' +
+				'    *   Fee\n' +
+				'    *   Fie\n' +
+				'    *   Foe\n' +
+				'3.  Third'
+			);
 		} );
 		} );
 
 
-		describe( 'toData', () => {
-			let viewFragment;
-
-			beforeEach( () => {
-				viewFragment = new DocumentFragment();
-			} );
-
-			it( 'should process unordered lists', () => {
-				viewFragment.appendChildren( parse(
-					'<ul>' +
-						'<li>item 1</li>' +
-						'<li>item 2</li>' +
-						'<li>item 3</li>' +
-					'</ul>'
-				) );
-
-				expect( dataProcessor.toData( viewFragment ) ).to.equal(
-					'*   item 1\n' +
-					'*   item 2\n' +
-					'*   item 3'
-				);
-			} );
-
-			it( 'should process ordered lists', () => {
-				viewFragment.appendChildren( parse(
-					'<ol>' +
-						'<li>item 1</li>' +
-						'<li>item 2</li>' +
-						'<li>item 3</li>' +
-					'</ol>'
-				) );
-
-				expect( dataProcessor.toData( viewFragment ) ).to.equal(
-					'1.  item 1\n' +
-					'2.  item 2\n' +
-					'3.  item 3'
-				);
-			} );
+		it( 'should create same bullet from different list indicators', () => {
+			test(
+				'* test\n' +
+				'+ test\n' +
+				'- test',
+
+				'<ul>' +
+					'<li>test</li>' +
+					'<li>test</li>' +
+					'<li>test</li>' +
+				'</ul>',
+
+				// After converting back list items will be unified.
+				'*   test\n' +
+				'*   test\n' +
+				'*   test'
+			);
 		} );
 		} );
 	} );
 	} );
 } );
 } );

+ 107 - 96
packages/ckeditor5-markdown-gfm/tests/gfmdataprocessor/paragraphs.js

@@ -3,113 +3,124 @@
  * For licensing, see LICENSE.md.
  * For licensing, see LICENSE.md.
  */
  */
 
 
-import MarkdownDataProcessor from '/ckeditor5/markdown-gfm/gfmdataprocessor.js';
-import DocumentFragment from '/ckeditor5/engine/view/documentfragment.js';
-import { stringify, parse } from '/tests/engine/_utils/view.js';
+import { testDataProcessor as test } from '/tests/markdown-gfm/_utils/utils.js';
 
 
 describe( 'GFMDataProcessor', () => {
 describe( 'GFMDataProcessor', () => {
-	let dataProcessor;
-
-	beforeEach( () => {
-		dataProcessor = new MarkdownDataProcessor();
-	} );
-
 	describe( 'paragraphs', () => {
 	describe( 'paragraphs', () => {
-		describe( 'toView', () => {
-			it( 'single line', () => {
-				const viewFragment = dataProcessor.toView( 'single line paragraph' );
-
-				expect( stringify( viewFragment ) ).to.equal( '<p>single line paragraph</p>' );
-			} );
-
-			it( 'multiline', () => {
-				const viewFragment = dataProcessor.toView( 'first\nsecond\nthird' );
-
-				expect( stringify( viewFragment ) ).to.equal( '<p>first<br></br>second<br></br>third</p>' );
-			} );
-
-			it( 'with header after #1', () => {
-				const viewFragment = dataProcessor.toView( 'single line\n# header' );
-
-				expect( stringify( viewFragment ) ).to.equal( '<p>single line</p><h1 id="header">header</h1>' );
-			} );
-
-			it( 'with header after #2', () => {
-				const viewFragment = dataProcessor.toView( 'single line\nheader\n===' );
-
-				expect( stringify( viewFragment ) ).to.equal( '<p>single line</p><h1 id="header">header</h1>' );
-			} );
-
-			it( 'with blockquote after', () => {
-				const viewFragment = dataProcessor.toView( 'single line\n> quote' );
-
-				expect( stringify( viewFragment ) ).to.equal( '<p>single line</p><blockquote><p>quote</p></blockquote>' );
-			} );
-
-			it( 'with list after', () => {
-				const viewFragment = dataProcessor.toView( 'single line\n* item' );
-
-				expect( stringify( viewFragment ) ).to.equal( '<p>single line</p><ul><li>item</li></ul>' );
-			} );
+		it( 'single line', () => {
+			test(
+				'single line paragraph',
 
 
-			it( 'with div element after', () => {
-				const viewFragment = dataProcessor.toView( 'single line\n<div>div element</div>' );
-
-				expect( stringify( viewFragment ) ).to.equal( '<p>single line</p><div>div element</div>' );
-			} );
+				'<p>single line paragraph</p>'
+			);
 		} );
 		} );
 
 
-		describe( 'toData', () => {
-			let viewFragment;
-
-			beforeEach( () => {
-				viewFragment = new DocumentFragment();
-			} );
-
-			it( 'should process single line paragraph', () => {
-				viewFragment.appendChildren( parse( '<p>single line paragraph</p>' ) );
-
-				expect( dataProcessor.toData( viewFragment ) ).to.equal( 'single line paragraph' );
-			} );
-
-			it( 'should process multi line paragraph', () => {
-				viewFragment.appendChildren( parse( '<p>first<br></br>second<br></br>third</p>' ) );
-
-				expect( dataProcessor.toData( viewFragment ) ).to.equal( 'first\nsecond\nthird' );
-			} );
-
-			it( 'should process multi line paragraph with header after it', () => {
-				viewFragment.appendChildren( parse( '<p>single line</p><h1 id="header">header</h1>' ) );
-
-				expect( dataProcessor.toData( viewFragment ) ).to.equal( 'single line\n\n# header' );
-			} );
-
-			it( 'should process multi line paragraph with blockquote after it', () => {
-				viewFragment.appendChildren( parse( '<p>single line</p><blockquote><p>quote</p></blockquote>' ) );
+		it( 'multiline', () => {
+			test(
+				'first\n' +
+				'second\n' +
+				'third',
+
+				// GitHub is rendering as:
+				// <p>first<br>
+				// second<br>
+				// third</p>
+				'<p>first<br></br>second<br></br>third</p>'
+			);
+		} );
 
 
-				expect( dataProcessor.toData( viewFragment ) ).to.equal(
-					'single line\n\n' +
-					'> quote'
-				);
-			} );
+		it( 'with header after #1', () => {
+			test(
+				'single line\n' +
+				'# header',
+
+				// GitHub is rendering as:
+				// <p>single line</p>
+				//
+				//<h1>header</h1>
+				'<p>single line</p><h1 id="header">header</h1>',
+
+				// To-markdown always put 2 empty lines after paragraph.
+				'single line\n\n' +
+				'# header'
+			);
+		} );
 
 
-			it( 'should process paragraph with list after', () => {
-				viewFragment.appendChildren( parse( '<p>single line</p><ul><li>item</li></ul>' ) );
+		it( 'with header after #2', () => {
+			test(
+				'single line\n' +
+				'header\n' +
+				'===',
+
+				// GitHub is rendering as:
+				// <p>single line</p>
+				//
+				//<h1>header</h1>
+				'<p>single line</p><h1 id="header">header</h1>',
+
+				// To-markdown always put 2 empty lines after paragraph and normalize header to #.
+				'single line\n' +
+				'\n' +
+				'# header'
+			);
+		} );
 
 
-				expect( dataProcessor.toData( viewFragment ) ).to.equal(
-					'single line\n\n' +
-					'*   item'
-				);
-			} );
+		it( 'with blockquote after', () => {
+			test(
+				'single line' +
+				'\n> quote',
+
+				// GitHub is rendereing as:
+				// <p>single line</p>
+				//
+				// <blockquote>
+				// <p>quote</p>
+				// </blockquote>
+				'<p>single line</p><blockquote><p>quote</p></blockquote>',
+
+				// To-markdown always put 2 empty lines after paragraph.
+				'single line\n' +
+				'\n' +
+				'> quote'
+			);
+		} );
 
 
-			it( 'should process paragraph with div after', () => {
-				viewFragment.appendChildren( parse( '<p>single line</p><div>div element</div>' ) );
+		it( 'with list after', () => {
+			test(
+				'single line\n' +
+				'* item',
+
+				// GitHub is rendering as:
+				// <p>single line</p>
+				//
+				// <ul>
+				// <li>item</li>
+				// </ul>
+				'<p>single line</p><ul><li>item</li></ul>',
+
+				// To-markdown always put 2 empty lines after paragraph.
+				'single line\n' +
+				'\n' +
+				'*   item'
+			);
+		} );
 
 
-				expect( dataProcessor.toData( viewFragment ) ).to.equal(
-					'single line\n\n' +
-					'<div>div element</div>'
-				);
-			} );
+		it( 'with div element after', () => {
+			test(
+				'single line\n' +
+				'<div>div element</div>',
+
+				// GitHub is rendering as:
+				// <p>single line</p>
+				//
+				// <div>div element</div>
+				'<p>single line</p><div>div element</div>',
+
+				// To-markdown always put 2 empty lines after paragraph.
+				'single line\n' +
+				'\n' +
+				'<div>div element</div>'
+			);
 		} );
 		} );
 	} );
 	} );
 } );
 } );

+ 75 - 74
packages/ckeditor5-markdown-gfm/tests/gfmdataprocessor/strong_and_emphasis.js

@@ -3,104 +3,105 @@
  * For licensing, see LICENSE.md.
  * For licensing, see LICENSE.md.
  */
  */
 
 
-import MarkdownDataProcessor from '/ckeditor5/markdown-gfm/gfmdataprocessor.js';
-import DocumentFragment from '/ckeditor5/engine/view/documentfragment.js';
-import { stringify, parse } from '/tests/engine/_utils/view.js';
+import { testDataProcessor as test } from '/tests/markdown-gfm/_utils/utils.js';
 
 
 describe( 'GFMDataProcessor', () => {
 describe( 'GFMDataProcessor', () => {
-	let dataProcessor;
-
-	beforeEach( () => {
-		dataProcessor = new MarkdownDataProcessor();
-	} );
-
 	describe( 'strong and emphasis', () => {
 	describe( 'strong and emphasis', () => {
-		describe( 'toView', () => {
-			it( 'should process strong', () => {
-				const viewFragment = dataProcessor.toView( '**this is strong** and __this too__' );
-
-				expect( stringify( viewFragment ) ).to.equal( '<p><strong>this is strong</strong> and <strong>this too</strong></p>' );
-			} );
-
-			it( 'should process emphasis', () => {
-				const viewFragment = dataProcessor.toView( '*this is emphasis* and _this too_' );
-
-				expect( stringify( viewFragment ) ).to.equal( '<p><em>this is emphasis</em> and <em>this too</em></p>' );
-			} );
-
-			it( 'should process strong and emphasis together #1', () => {
-				const viewFragment = dataProcessor.toView( '***This is strong and em.***' );
-
-				expect( stringify( viewFragment ) ).to.equal( '<p><strong><em>This is strong and em.</em></strong></p>' );
-			} );
+		it( 'should process strong', () => {
+			test(
+				'**this is strong** and __this too__',
 
 
-			it( 'should process strong and emphasis together #2', () => {
-				const viewFragment = dataProcessor.toView( 'Single ***word*** is strong and em.' );
+				'<p><strong>this is strong</strong> and <strong>this too</strong></p>',
 
 
-				expect( stringify( viewFragment ) ).to.equal( '<p>Single <strong><em>word</em></strong> is strong and em.</p>' );
-			} );
-
-			it( 'should process strong and emphasis together #3', () => {
-				const viewFragment = dataProcessor.toView( '___This is strong and em.___' );
+				// When converting back strong will always be represented by **.
+				'**this is strong** and **this too**'
+			);
+		} );
 
 
-				expect( stringify( viewFragment ) ).to.equal( '<p><strong><em>This is strong and em.</em></strong></p>' );
-			} );
+		it( 'should process emphasis', () => {
+			test(
+				'*this is emphasis* and _this too_',
 
 
-			it( 'should process strong and emphasis together #4', () => {
-				const viewFragment = dataProcessor.toView( 'Single ___word___ is strong and em.' );
+				'<p><em>this is emphasis</em> and <em>this too</em></p>',
 
 
-				expect( stringify( viewFragment ) ).to.equal( '<p>Single <strong><em>word</em></strong> is strong and em.</p>' );
-			} );
+				// When converting back emphasis will always be represented by __.
+				'_this is emphasis_ and _this too_'
+			);
+		} );
 
 
-			it( 'should not process emphasis inside words', () => {
-				const viewFragment = dataProcessor.toView( 'This should_not_be_emp.' );
+		it( 'should process strong and emphasis together #1', () => {
+			test(
+				'***This is strong and em.***',
 
 
-				expect( stringify( viewFragment ) ).to.equal( '<p>This should_not_be_emp.</p>' );
-			} );
+				'<p><strong><em>This is strong and em.</em></strong></p>',
 
 
-			it( 'should process nested emphasis #1', () => {
-				const viewFragment = dataProcessor.toView( '*test **test** test*' );
+				// Normalized after converting back.
+				'**_This is strong and em._**'
+			);
+		} );
 
 
-				expect( stringify( viewFragment ) ).to.equal( '<p><em>test <strong>test</strong> test</em></p>' );
-			} );
+		it( 'should process strong and emphasis together #2', () => {
+			test(
+				'Single ***word*** is strong and em.',
 
 
-			it( 'should process nested emphasis #2', () => {
-				const viewFragment = dataProcessor.toView( '_test __test__ test_' );
+				'<p>Single <strong><em>word</em></strong> is strong and em.</p>',
 
 
-				expect( stringify( viewFragment ) ).to.equal( '<p><em>test <strong>test</strong> test</em></p>' );
-			} );
+				// Normalized after converting back.
+				'Single **_word_** is strong and em.'
+			);
 		} );
 		} );
 
 
-		describe( 'toData', () => {
-			let viewFragment;
+		it( 'should process strong and emphasis together #3', () => {
+			test(
+				'___This is strong and em.___',
 
 
-			beforeEach( () => {
-				viewFragment = new DocumentFragment();
-			} );
+				'<p><strong><em>This is strong and em.</em></strong></p>',
 
 
-			it( 'should process strong', () => {
-				viewFragment.appendChildren( parse( '<p><strong>strong</strong> and <strong>this too</strong></p>' ) );
+				// Normalized after converting back.
+				'**_This is strong and em._**'
 
 
-				expect( dataProcessor.toData( viewFragment ) ).to.equal( '**strong** and **this too**' );
-			} );
-
-			it( 'should process emphasis', () => {
-				viewFragment.appendChildren( parse( '<p><em>emphasis</em> and <em>this too</em></p>' ) );
+			);
+		} );
 
 
-				expect( dataProcessor.toData( viewFragment ) ).to.equal( '_emphasis_ and _this too_' );
-			} );
+		it( 'should process strong and emphasis together #4', () => {
+			test(
+				'Single ___word___ is strong and em.',
 
 
-			it( 'should process strong and emphasis together #1', () => {
-				viewFragment.appendChildren( parse( '<p><strong><em>This is strong and em.</em></strong></p>' ) );
+				'<p>Single <strong><em>word</em></strong> is strong and em.</p>',
 
 
-				expect( dataProcessor.toData( viewFragment ) ).to.equal( '**_This is strong and em._**' );
-			} );
+				// Normalized after converting back.
+				'Single **_word_** is strong and em.'
+			);
+		} );
 
 
-			it( 'should process strong and emphasis together #2', () => {
-				viewFragment.appendChildren( parse( '<p><em><strong>This is strong and em.</strong></em></p>' ) );
+		it( 'should not process emphasis inside words', () => {
+			test(
+				'This should_not_be_emp.',
 
 
-				expect( dataProcessor.toData( viewFragment ) ).to.equal( '_**This is strong and em.**_' );
-			} );
+				'<p>This should_not_be_emp.</p>'
+			);
 		} );
 		} );
+
+		// Below two tests are not working because marked library renders nested emphasis differently than
+		// it is done on GitHub.
+
+		// it( 'should process nested emphasis #1', () => {
+		// 	test(
+		// 		'*test **test** test*',
+		//
+		// 		// GitHub is rendering as:
+		// 		// <p><em>test *</em>test** test*</p>
+		//
+		// 		'<p><em>test *</em>test** test*</p>'
+		// 	);
+		// } );
+		// it( 'should process nested emphasis #2', () => {
+		// 	test(
+		// 		'_test __test__ test_',
+		//
+		// 		// GitHub is rendering as:
+		// 		'<p><em>test __test_</em> test_</p>'
+		// 	);
+		// } );
 	} );
 	} );
 } );
 } );

+ 143 - 224
packages/ckeditor5-markdown-gfm/tests/gfmdataprocessor/tables.js

@@ -3,237 +3,156 @@
  * For licensing, see LICENSE.md.
  * For licensing, see LICENSE.md.
  */
  */
 
 
-import MarkdownDataProcessor from '/ckeditor5/markdown-gfm/gfmdataprocessor.js';
-import DocumentFragment from '/ckeditor5/engine/view/documentfragment.js';
-import { stringify, parse } from '/tests/engine/_utils/view.js';
+import { testDataProcessor as test } from '/tests/markdown-gfm/_utils/utils.js';
 
 
 describe( 'GFMDataProcessor', () => {
 describe( 'GFMDataProcessor', () => {
-	let dataProcessor;
-
-	beforeEach( () => {
-		dataProcessor = new MarkdownDataProcessor();
-	} );
-
 	describe( 'tables', () => {
 	describe( 'tables', () => {
-		describe( 'toView', () => {
-			it( 'should process tables', () => {
-				const viewFragment = dataProcessor.toView(
-					'| Heading 1 | Heading 2\n' +
-					'| --- | ---\n' +
-					'| Cell 1    | Cell 2\n' +
-					'| Cell 3    | Cell 4\n'
-				);
-
-				expect( stringify( viewFragment ) ).to.equal(
-					'<table>' +
-						'<thead>' +
-							'<tr>' +
-								'<th>Heading 1</th>' +
-								'<th>Heading 2</th>' +
-							'</tr>' +
-						'</thead>' +
-						'<tbody>' +
-							'<tr>' +
-								'<td>Cell 1</td>' +
-								'<td>Cell 2</td>' +
-							'</tr>' +
-							'<tr>' +
-								'<td>Cell 3</td>' +
-								'<td>Cell 4</td>' +
-							'</tr>' +
-						'</tbody>' +
-					'</table>'
-				);
-			} );
-
-			it( 'should process tables with aligned columns', () => {
-				const viewFragment = dataProcessor.toView(
-					'| Header 1 | Header 2 | Header 3 | Header 4 |\n' +
-					'| :------: | -------: | :------- | -------- |\n' +
-					'| Cell 1   | Cell 2   | Cell 3   | Cell 4   |\n' +
-					'| Cell 5   | Cell 6   | Cell 7   | Cell 8   |'
-				);
-
-				expect( stringify( viewFragment ) ).to.equal(
-					'<table>' +
-						'<thead>' +
-							'<tr>' +
-								'<th align="center">Header 1</th>' +
-								'<th align="right">Header 2</th>' +
-								'<th align="left">Header 3</th>' +
-								'<th>Header 4</th>' +
-							'</tr>' +
-						'</thead>' +
-						'<tbody>' +
-							'<tr>' +
-								'<td align="center">Cell 1</td>' +
-								'<td align="right">Cell 2</td>' +
-								'<td align="left">Cell 3</td>' +
-								'<td>Cell 4</td>' +
-							'</tr>' +
-							'<tr>' +
-								'<td align="center">Cell 5</td>' +
-								'<td align="right">Cell 6</td>' +
-								'<td align="left">Cell 7</td>' +
-								'<td>Cell 8</td>' +
-							'</tr>' +
-						'</tbody>' +
-					'</table>'
-				);
-			} );
-
-			it( 'should process not table without borders', () => {
-				const viewFragment = dataProcessor.toView(
-					'Header 1 | Header 2\n' +
-					'-------- | --------\n' +
-					'Cell 1   | Cell 2\n' +
-					'Cell 3   | Cell 4'
-				);
-
-				expect( stringify( viewFragment ) ).to.equal(
-					'<table>' +
-						'<thead>' +
-							'<tr><th>Header 1</th><th>Header 2</th></tr>' +
-						'</thead>' +
-						'<tbody>' +
-							'<tr><td>Cell 1</td><td>Cell 2</td></tr>' +
-							'<tr><td>Cell 3</td><td>Cell 4</td></tr>' +
-						'</tbody>' +
-					'</table>'
-				);
-			} );
-
-			it( 'should process formatting inside cells', () => {
-				const viewFragment = dataProcessor.toView(
-					'Header 1|Header 2|Header 3|Header 4\n' +
-					':-------|:------:|-------:|--------\n' +
-					'*Cell 1*  |**Cell 2**  |~~Cell 3~~  |Cell 4'
-				);
-
-				expect( stringify( viewFragment ) ).to.equal(
-					'<table>' +
-						'<thead>' +
-							'<tr>' +
-								'<th align="left">Header 1</th>' +
-								'<th align="center">Header 2</th>' +
-								'<th align="right">Header 3</th>' +
-								'<th>Header 4</th>' +
-							'</tr>' +
-						'</thead>' +
-						'<tbody>' +
-							'<tr>' +
-								'<td align="left"><em>Cell 1</em></td>' +
-								'<td align="center"><strong>Cell 2</strong></td>' +
-								'<td align="right"><del>Cell 3</del></td>' +
-								'<td>Cell 4</td>' +
-							'</tr>' +
-						'</tbody>' +
-					'</table>'
-				);
-			} );
+		it( 'should process tables', () => {
+			test(
+				'| Heading 1 | Heading 2\n' +
+				'| --- | ---\n' +
+				'| Cell 1    | Cell 2\n' +
+				'| Cell 3    | Cell 4\n',
+
+				'<table>' +
+					'<thead>' +
+						'<tr>' +
+							'<th>Heading 1</th>' +
+							'<th>Heading 2</th>' +
+						'</tr>' +
+					'</thead>' +
+					'<tbody>' +
+						'<tr>' +
+							'<td>Cell 1</td>' +
+							'<td>Cell 2</td>' +
+						'</tr>' +
+						'<tr>' +
+							'<td>Cell 3</td>' +
+							'<td>Cell 4</td>' +
+						'</tr>' +
+					'</tbody>' +
+				'</table>',
+
+				// After converting back it will be normalized.
+				'| Heading 1 | Heading 2 |\n' +
+				'| --- | --- |\n' +
+				'| Cell 1 | Cell 2 |\n' +
+				'| Cell 3 | Cell 4 |'
+			);
 		} );
 		} );
 
 
-		describe( 'toData', () => {
-			let viewFragment;
-
-			beforeEach( () => {
-				viewFragment = new DocumentFragment();
-			} );
-
-			it( 'should process tables', () => {
-				viewFragment.appendChildren( parse(
-					'<table>' +
-						'<thead>' +
-							'<tr>' +
-								'<th>Heading 1</th>' +
-								'<th>Heading 2</th>' +
-							'</tr>' +
-						'</thead>' +
-						'<tbody>' +
-							'<tr>' +
-								'<td>Cell 1</td>' +
-								'<td>Cell 2</td>' +
-							'</tr>' +
-							'<tr>' +
-								'<td>Cell 3</td>' +
-								'<td>Cell 4</td>' +
-							'</tr>' +
-						'</tbody>' +
-					'</table>'
-				) );
-
-				expect( dataProcessor.toData( viewFragment ) ).to.equal(
-					'| Heading 1 | Heading 2 |\n' +
-					'| --- | --- |\n' +
-					'| Cell 1 | Cell 2 |\n' +
-					'| Cell 3 | Cell 4 |'
-				);
-			} );
-
-			it( 'should process tables with aligned columns', () => {
-				viewFragment.appendChildren( parse(
-					'<table>' +
-						'<thead>' +
-							'<tr>' +
-								'<th align="center">Header 1</th>' +
-								'<th align="right">Header 2</th>' +
-								'<th align="left">Header 3</th>' +
-								'<th>Header 4</th>' +
-							'</tr>' +
-						'</thead>' +
-						'<tbody>' +
-							'<tr>' +
-								'<td align="center">Cell 1</td>' +
-								'<td align="right">Cell 2</td>' +
-								'<td align="left">Cell 3</td>' +
-								'<td>Cell 4</td>' +
-							'</tr>' +
-							'<tr>' +
-								'<td align="center">Cell 5</td>' +
-								'<td align="right">Cell 6</td>' +
-								'<td align="left">Cell 7</td>' +
-								'<td>Cell 8</td>' +
-							'</tr>' +
-						'</tbody>' +
-					'</table>'
-				) );
-
-				expect( dataProcessor.toData( viewFragment ) ).to.equal(
-					'| Header 1 | Header 2 | Header 3 | Header 4 |\n' +
-					'| :-: | --: | :-- | --- |\n' +
-					'| Cell 1 | Cell 2 | Cell 3 | Cell 4 |\n' +
-					'| Cell 5 | Cell 6 | Cell 7 | Cell 8 |'
-				);
-			} );
+		it( 'should process tables with aligned columns', () => {
+			test(
+				'| Header 1 | Header 2 | Header 3 | Header 4 |\n' +
+				'| :------: | -------: | :------- | -------- |\n' +
+				'| Cell 1   | Cell 2   | Cell 3   | Cell 4   |\n' +
+				'| Cell 5   | Cell 6   | Cell 7   | Cell 8   |',
+
+				'<table>' +
+					'<thead>' +
+						'<tr>' +
+							'<th align="center">Header 1</th>' +
+							'<th align="right">Header 2</th>' +
+							'<th align="left">Header 3</th>' +
+							'<th>Header 4</th>' +
+						'</tr>' +
+					'</thead>' +
+					'<tbody>' +
+						'<tr>' +
+							'<td align="center">Cell 1</td>' +
+							'<td align="right">Cell 2</td>' +
+							'<td align="left">Cell 3</td>' +
+							'<td>Cell 4</td>' +
+						'</tr>' +
+						'<tr>' +
+							'<td align="center">Cell 5</td>' +
+							'<td align="right">Cell 6</td>' +
+							'<td align="left">Cell 7</td>' +
+							'<td>Cell 8</td>' +
+						'</tr>' +
+					'</tbody>' +
+				'</table>',
+
+				// After converting back it will be normalized.
+				'| Header 1 | Header 2 | Header 3 | Header 4 |\n' +
+				'| :-: | --: | :-- | --- |\n' +
+				'| Cell 1 | Cell 2 | Cell 3 | Cell 4 |\n' +
+				'| Cell 5 | Cell 6 | Cell 7 | Cell 8 |'
+			);
+		} );
 
 
-			it( 'should process formatting inside cells', () => {
-				viewFragment.appendChildren( parse(
-					'<table>' +
-						'<thead>' +
-							'<tr>' +
-								'<th align="left">Header 1</th>' +
-								'<th align="center">Header 2</th>' +
-								'<th align="right">Header 3</th>' +
-								'<th>Header 4</th>' +
-							'</tr>' +
-						'</thead>' +
-						'<tbody>' +
-							'<tr>' +
-								'<td align="left"><em>Cell 1</em></td>' +
-								'<td align="center"><strong>Cell 2</strong></td>' +
-								'<td align="right"><del>Cell 3</del></td>' +
-								'<td>Cell 4</td>' +
-							'</tr>' +
-						'</tbody>' +
-					'</table>'
-				) );
+		it( 'should process not table without borders', () => {
+			test(
+				'Header 1 | Header 2\n' +
+				'-------- | --------\n' +
+				'Cell 1   | Cell 2\n' +
+				'Cell 3   | Cell 4',
+
+				'<table>' +
+					'<thead>' +
+						'<tr>' +
+							'<th>Header 1</th>' +
+							'<th>Header 2</th>' +
+						'</tr>' +
+					'</thead>' +
+					'<tbody>' +
+						'<tr>' +
+							'<td>Cell 1</td>' +
+							'<td>Cell 2</td>' +
+						'</tr>' +
+						'<tr>' +
+							'<td>Cell 3</td>' +
+							'<td>Cell 4</td>' +
+						'</tr>' +
+					'</tbody>' +
+				'</table>',
+
+				// After converting back it will be normalized.
+				'| Header 1 | Header 2 |\n' +
+				'| --- | --- |\n' +
+				'| Cell 1 | Cell 2 |\n' +
+				'| Cell 3 | Cell 4 |'
+			);
+		} );
 
 
-				expect( dataProcessor.toData( viewFragment ) ).to.equal(
-					'| Header 1 | Header 2 | Header 3 | Header 4 |\n' +
-					'| :-- | :-: | --: | --- |\n' +
-					'| _Cell 1_ | **Cell 2** | ~~Cell 3~~ | Cell 4 |'
-				);
-			} );
+		it( 'should process formatting inside cells', () => {
+			test(
+				'Header 1|Header 2|Header 3|Header 4\n' +
+				':-------|:------:|-------:|--------\n' +
+				'*Cell 1*  |**Cell 2**  |~~Cell 3~~  |Cell 4',
+
+				'<table>' +
+					'<thead>' +
+						'<tr>' +
+							'<th align="left">Header 1</th>' +
+							'<th align="center">Header 2</th>' +
+							'<th align="right">Header 3</th>' +
+							'<th>Header 4</th>' +
+						'</tr>' +
+					'</thead>' +
+					'<tbody>' +
+						'<tr>' +
+							'<td align="left">' +
+								'<em>Cell 1</em>' +
+							'</td>' +
+							'<td align="center">' +
+								'<strong>Cell 2</strong>' +
+							'</td>' +
+							'<td align="right">' +
+								'<del>Cell 3</del>' +
+							'</td>' +
+							'<td>' +
+								'Cell 4' +
+							'</td>' +
+						'</tr>' +
+					'</tbody>' +
+				'</table>',
+
+				// After converting back it will be normalized.
+				'| Header 1 | Header 2 | Header 3 | Header 4 |\n' +
+				'| :-- | :-: | --: | --- |\n' +
+				'| _Cell 1_ | **Cell 2** | ~~Cell 3~~ | Cell 4 |'
+			);
 		} );
 		} );
 	} );
 	} );
 } );
 } );

+ 65 - 28
packages/ckeditor5-markdown-gfm/tests/gfmdataprocessor/tabs.js

@@ -3,47 +3,84 @@
  * For licensing, see LICENSE.md.
  * For licensing, see LICENSE.md.
  */
  */
 
 
-import MarkdownDataProcessor from '/ckeditor5/markdown-gfm/gfmdataprocessor.js';
-import { stringify } from '/tests/engine/_utils/view.js';
+import { testDataProcessor as test } from '/tests/markdown-gfm/_utils/utils.js';
 
 
 describe( 'GFMDataProcessor', () => {
 describe( 'GFMDataProcessor', () => {
-	let dataProcessor;
+	describe( 'tabs', () => {
+		it( 'should process list item with tabs', () => {
+			test(
+				'+	this is a list item indented with tabs',
 
 
-	beforeEach( () => {
-		dataProcessor = new MarkdownDataProcessor();
-	} );
+				// GitHub will render it as (notice two spaces at the beginning of the list item):
+				// <ul>
+				// <li>  this is a list item indented with tabs</li>
+				// </ul>
+				'<ul>' +
+				'<li>this is a list item indented with tabs</li>' +
+				'</ul>',
 
 
-	describe( 'tabs', () => {
-		describe( 'toView', () => {
-			it( 'should process list item with tabs', () => {
-				const viewFragment = dataProcessor.toView( '+	this is a list item indented with tabs' );
+				// After converting back list will be normalized to *.
+				'*   this is a list item indented with tabs'
+			);
+		} );
+
+		it( 'should process list item with spaces', () => {
+			test(
+				'+   this is a list item indented with spaces',
 
 
-				expect( stringify( viewFragment ) ).to.equal( '<ul><li>this is a list item indented with tabs</li></ul>' );
-			} );
+				// GitHub will render it as (notice two spaces at the beginning of the list item):
+				// <ul>
+				// <li>  this is a list item indented with spaces</li>
+				// </ul>
+				'<ul>' +
+				'<li>this is a list item indented with spaces</li>' +
+				'</ul>',
 
 
-			it( 'should process list item with spaces', () => {
-				const viewFragment = dataProcessor.toView( '+   this is a list item indented with spaces' );
+				// After converting back list will be normalized to *.
+				'*   this is a list item indented with spaces'
+			);
+		} );
+
+		it( 'should process code block indented by tab', () => {
+			test(
+				'	this code block is indented by one tab',
 
 
-				expect( stringify( viewFragment ) ).to.equal( '<ul><li>this is a list item indented with spaces</li></ul>' );
-			} );
+				'<pre><code>this code block is indented by one tab</code></pre>',
 
 
-			it( 'should process code block indented by tab', () => {
-				const viewFragment = dataProcessor.toView( '	this code block is indented by one tab' );
+				// After converting back code block will be normalized to ``` representation.
+				'```\n' +
+				'this code block is indented by one tab\n' +
+				'```'
+			);
+		} );
 
 
-				expect( stringify( viewFragment ) ).to.equal( '<pre><code>this code block is indented by one tab</code></pre>' );
-			} );
+		it( 'should process code block indented by two tabs', () => {
+			test(
+				'		this code block is indented by two tabs',
 
 
-			it( 'should process code block indented by two tabs', () => {
-				const viewFragment = dataProcessor.toView( '		this code block is indented by two tabs' );
+				'<pre><code>    this code block is indented by two tabs</code></pre>',
+
+				// After converting back code block will be normalized to ``` representation.
+				'```\n' +
+				'    this code block is indented by two tabs\n' +
+				'```'
+			);
+		} );
 
 
-				expect( stringify( viewFragment ) ).to.equal( '<pre><code>    this code block is indented by two tabs</code></pre>' );
-			} );
+		it( 'should process list items indented with tabs as code block', () => {
+			test(
+				'	+	list item\n' +
+				'	next line',
 
 
-			it( 'should process list items indented with tabs - code block', () => {
-				const viewFragment = dataProcessor.toView( '	+	list item\n		next line' );
+				'<pre><code>+    list item\n' +
+				'next line</code></pre>',
 
 
-				expect( stringify( viewFragment ) ).to.equal( '<pre><code>+    list item\n    next line</code></pre>' );
-			} );
+				// After converting back code block will be normalized to ``` representation.
+				'```\n' +
+				'+    list item\n' +
+				'next line\n' +
+				'```'
+			);
 		} );
 		} );
 	} );
 	} );
 } );
 } );