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+/**
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+ * @license Copyright (c) 2003-2016, CKSource - Frederico Knabben. All rights reserved.
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+ * For licensing, see LICENSE.md.
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+ */
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+
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+import { isSurrogateHalf, isCombiningMark, isInsideSurrogatePair, isInsideCombinedSymbol } from '/ckeditor5/utils/unicode.js';
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+
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+describe( 'utils', () => {
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+ describe( 'unicode', () => {
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+ describe( 'isSurrogateHalf', () => {
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+ it( 'should return true if given character is a surrogate half', () => {
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+ // Half of pile of poo.
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+ expect( isSurrogateHalf( '\uD83D' ) ).to.be.true;
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+ } );
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+
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+ it( 'should return false if given character is not a surrogate half', () => {
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+ expect( isSurrogateHalf( 'a' ) ).to.be.false;
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+ expect( isSurrogateHalf( '𨭎' ) ).to.be.false;
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+ } );
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+
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+ it( 'should return false for falsy values', () => {
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+ expect( isSurrogateHalf( null ) ).to.be.false;
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+ expect( isSurrogateHalf( undefined ) ).to.be.false;
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+ expect( isSurrogateHalf( false ) ).to.be.false;
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+ expect( isSurrogateHalf( 0 ) ).to.be.false;
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+ } );
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+ } );
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+
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+ describe( 'isCombiningMark', () => {
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+ it( 'should return true if given character is a combining mark', () => {
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+ expect( isCombiningMark( '̣' ) ).to.be.true;
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+ } );
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+
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+ it( 'should return false if given character is not a combining mark', () => {
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+ expect( isCombiningMark( 'a' ) ).to.be.false;
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+ expect( isCombiningMark( 'q̣' ) ).to.be.false;
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+ } );
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+
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+ it( 'should return false for falsy values', () => {
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+ expect( isCombiningMark( null ) ).to.be.false;
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+ expect( isCombiningMark( undefined ) ).to.be.false;
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+ expect( isCombiningMark( false ) ).to.be.false;
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+ expect( isCombiningMark( 0 ) ).to.be.false;
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+ } );
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+ } );
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+
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+ describe( 'isInsideSurrogatePair', () => {
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+ const testString = 'a𨭎b';
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+
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+ it( 'should return true if given offset in a string is inside a surrogate pair', () => {
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+ expect( isInsideSurrogatePair( testString, 2 ) ).to.be.true;
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+ } );
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+
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+ it( 'should return false if given offset in a string is not inside a surrogate pair', () => {
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+ expect( isInsideSurrogatePair( testString, 1 ) ).to.be.false;
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+ expect( isInsideSurrogatePair( testString, 3 ) ).to.be.false;
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+ } );
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+
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+ it( 'should return false if given offset in a string is at the string beginning or end', () => {
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+ expect( isInsideSurrogatePair( testString, 0 ) ).to.be.false;
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+ expect( isInsideSurrogatePair( testString, 4 ) ).to.be.false;
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+ } );
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+ } );
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+
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+ describe( 'isInsideCombinedSymbol', () => {
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+ const testString = 'aa̻̐ͩbb';
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+
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+ it( 'should return true if given offset in a string is inside a symbol with combining mark', () => {
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+ expect( isInsideCombinedSymbol( testString, 2 ) ).to.be.true;
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+ expect( isInsideCombinedSymbol( testString, 3 ) ).to.be.true;
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+ expect( isInsideCombinedSymbol( testString, 4 ) ).to.be.true;
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+ } );
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+
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+ it( 'should return false if given offset in a string is not inside a symbol with combining mark', () => {
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+ expect( isInsideCombinedSymbol( testString, 1 ) ).to.be.false;
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+ expect( isInsideCombinedSymbol( testString, 5 ) ).to.be.false;
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+ } );
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+
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+ it( 'should return false if given offset in a string is at the string beginning or end', () => {
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+ expect( isInsideCombinedSymbol( testString, 0 ) ).to.be.false;
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+ expect( isInsideCombinedSymbol( testString, 6 ) ).to.be.false;
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+ } );
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+ } );
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+ } );
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+} );
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