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@@ -0,0 +1,212 @@
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+/**
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+ * @license Copyright (c) 2003-2018, 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 fastDiff from '../src/fastdiff';
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+import diff from '../src/diff';
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+import diffToChanges from '../src/difftochanges';
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+
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+describe( 'fastDiff', () => {
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+ it( 'should diff identical texts', () => {
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+ expectDiff( '123', '123', [] );
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+ } );
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+
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+ describe( 'insertion', () => {
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+ it( 'should diff if old text is empty', () => {
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+ expectDiff( '', '123', [ { index: 0, type: 'insert', values: [ '1', '2', '3' ] } ] );
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+ } );
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+
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+ it( 'should diff insertion on the beginning', () => {
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+ expectDiff( '123', 'abc123', [ { index: 0, type: 'insert', values: [ 'a', 'b', 'c' ] } ] );
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+ } );
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+
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+ it( 'should diff insertion on the beginning (repetitive substring)', () => {
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+ // Do not check compatibility with 'diffToChanges' as it generates:
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+ // [ { index: 0, type: 'insert', values: [ 'a', 'b' ] }, { index: 5, type: 'insert', values: [ 'c', '1', '2', '3' ] } ]
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+ expectDiff( '123', 'ab123c123', [ { index: 0, type: 'insert', values: [ 'a', 'b', '1', '2', '3', 'c' ] } ], false );
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+ } );
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+
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+ it( 'should diff insertion on the end', () => {
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+ expectDiff( '123', '123abc', [ { index: 3, type: 'insert', values: [ 'a', 'b', 'c' ] } ] );
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+ } );
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+
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+ it( 'should diff insertion on the end (repetitive substring)', () => {
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+ expectDiff( '123', '123ab123c', [ { index: 3, type: 'insert', values: [ 'a', 'b', '1', '2', '3', 'c' ] } ] );
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+ } );
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+
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+ it( 'should diff insertion in the middle', () => {
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+ expectDiff( '123', '12abc3', [ { index: 2, type: 'insert', values: [ 'a', 'b', 'c' ] } ] );
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+ } );
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+
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+ it( 'should diff insertion in the middle (repetitive substring)', () => {
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+ // Do not check compatibility with 'diffToChanges' as it generates:
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+ // [ { index: 2, type: 'insert', values: [ 'a', 'b', '1', '2' ] }, { index: 7, type: 'insert', values: [ 'c', '3' ] } ]
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+ expectDiff( '123', '12ab123c3', [ { index: 2, type: 'insert', values: [ 'a', 'b', '1', '2', '3', 'c' ] } ], false );
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+ } );
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+
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+ it( 'should diff insertion of duplicated content', () => {
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+ expectDiff( '123', '123123', [ { index: 3, type: 'insert', values: [ '1', '2', '3' ] } ] );
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+ } );
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+
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+ it( 'should diff insertion of partially duplicated content', () => {
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+ expectDiff( '123', '12323', [ { index: 3, type: 'insert', values: [ '2', '3' ] } ] );
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+ } );
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+
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+ it( 'should diff insertion on both boundaries', () => {
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+ // Do not check compatibility with 'diffToChanges' as it generates:
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+ // [ { index: 2, type: 'insert', values: [ 'a', 'b' ] }, { index: 5, type: 'insert', values: [ 'c' ] } ]
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+ expectDiff( '123', 'ab123c', [
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+ { index: 0, type: 'insert', values: [ 'a', 'b', '1', '2', '3', 'c' ] },
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+ { index: 6, type: 'delete', howMany: 3 }
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+ ], false );
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+ } );
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+ } );
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+
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+ describe( 'deletion', () => {
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+ it( 'should diff if new text is empty', () => {
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+ expectDiff( '123', '', [ { index: 0, type: 'delete', howMany: 3 } ] );
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+ } );
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+
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+ it( 'should diff deletion on the beginning', () => {
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+ expectDiff( 'abc123', '123', [ { index: 0, type: 'delete', howMany: 3 } ] );
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+ } );
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+
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+ it( 'should diff deletion on the beginning (repetitive substring)', () => {
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+ // Do not check compatibility with 'diffToChanges' as it generates:
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+ // [ { index: 0, type: 'delete', howMany: 2 }, { index: 3, type: 'delete', howMany: 4 } ]
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+ expectDiff( 'ab123c123', '123', [ { index: 0, type: 'delete', howMany: 6 } ], false );
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+ } );
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+
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+ it( 'should diff deletion on the end', () => {
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+ expectDiff( '123abc', '123', [ { index: 3, type: 'delete', howMany: 3 } ] );
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+ } );
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+
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+ it( 'should diff deletion on the end (repetitive substring)', () => {
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+ expectDiff( '123ab123c', '123', [ { index: 3, type: 'delete', howMany: 6 } ] );
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+ } );
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+
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+ it( 'should diff deletion in the middle', () => {
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+ expectDiff( '12abc3', '123', [ { index: 2, type: 'delete', howMany: 3 } ] );
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+ } );
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+
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+ it( 'should diff deletion in the middle (repetitive substring)', () => {
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+ // Do not check compatibility with 'diffToChanges' as it generates:
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+ // [ { index: 2, type: 'delete', howMany: 4 }, { index: 3, type: 'delete', howMany: 2 } ]
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+ expectDiff( '12ab123c3', '123', [ { index: 2, type: 'delete', howMany: 6 } ], false );
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+ } );
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+
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+ it( 'should diff deletion on both boundaries', () => {
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+ // Do not check compatibility with 'diffToChanges' as it generates:
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+ // [ { index: 0, type: 'delete', howMany: 1 }, { index: 3, type: 'delete', howMany: 2 } ]
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+ expectDiff( '12abc3', '2ab', [
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+ { index: 0, type: 'insert', values: [ '2', 'a', 'b' ] },
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+ { index: 3, type: 'delete', howMany: 6 }
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+ ], false );
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+ } );
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+
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+ it( 'should diff deletion of duplicated content', () => {
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+ expectDiff( '123123', '123', [ { index: 3, type: 'delete', howMany: 3 } ] );
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+ } );
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+
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+ it( 'should diff deletion of partially duplicated content', () => {
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+ expectDiff( '12323', '123', [ { index: 3, type: 'delete', howMany: 2 } ] );
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+ } );
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+
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+ it( 'should diff deletion of partially duplicated content 2', () => {
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+ // Do not check compatibility with 'diffToChanges' as it generates:
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+ // [ { index: 1, type: 'delete', howMany: 2 }, { index: 2, type: 'delete', howMany: 1 } ]
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+ expectDiff( '11233', '13', [ { index: 1, type: 'delete', howMany: 3 } ], false );
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+ } );
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+ } );
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+
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+ describe( 'replacement', () => {
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+ it( 'should diff replacement of entire text', () => {
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+ // Do not check compatibility with 'diffToChanges' as it has changes in reveres order ('delete', 'insert') here.
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+ expectDiff( '12345', 'abcd', [
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+ { index: 0, type: 'insert', values: [ 'a', 'b', 'c', 'd' ] },
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+ { index: 4, type: 'delete', howMany: 5 }
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+ ], false );
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+ } );
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+
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+ it( 'should diff replacement on the beginning', () => {
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+ expectDiff( '12345', 'abcd345', [
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+ { index: 0, type: 'insert', values: [ 'a', 'b', 'c', 'd' ] },
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+ { index: 4, type: 'delete', howMany: 2 }
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+ ] );
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+ } );
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+
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+ it( 'should diff replacement on the beginning (repetitive substring)', () => {
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+ // Do not check compatibility with 'diffToChanges' as it has changes in reveres order ('delete', 'insert') here.
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+ expectDiff( '12345', '345345', [
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+ { index: 0, type: 'insert', values: [ '3', '4', '5' ] },
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+ { index: 3, type: 'delete', howMany: 2 }
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+ ], false );
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+ } );
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+
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+ it( 'should diff replacement on the end', () => {
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+ // Do not check compatibility with 'diffToChanges' as it has changes in reveres order ('delete', 'insert') here.
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+ expectDiff( '12345', '12ab', [
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+ { index: 2, type: 'insert', values: [ 'a', 'b' ] },
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+ { index: 4, type: 'delete', howMany: 3 }
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+ ], false );
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+ } );
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+
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+ it( 'should diff replacement on the end (repetitive substring)', () => {
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+ // Do not check compatibility with 'diffToChanges' as it generates:
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+ // [ { index: 3, type: 'insert', values: [ '1', '2', '3' ] }, { index: 7, type: 'delete', howMany: 1 } ]
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+ expectDiff( '12345', '1231234', [
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+ { index: 3, type: 'insert', values: [ '1', '2', '3', '4' ] },
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+ { index: 7, type: 'delete', howMany: 2 }
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+ ], false );
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+ } );
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+
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+ it( 'should diff insertion of duplicated content', () => {
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+ expectDiff( '1234', '123123', [
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+ { index: 3, type: 'insert', values: [ '1', '2', '3' ] },
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+ { index: 6, type: 'delete', howMany: 1 }
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+ ], false );
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+ } );
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+
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+ it( 'should diff insertion of duplicated content', () => {
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+ expectDiff( '1234', '13424', [
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+ { index: 1, type: 'insert', values: [ '3', '4', '2' ] },
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+ { index: 4, type: 'delete', howMany: 2 }
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+ ], false );
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+ } );
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+
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+ it( 'should diff replacement in the middle', () => {
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+ expectDiff( '12345', '12ab5', [
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+ { index: 2, type: 'insert', values: [ 'a', 'b' ] },
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+ { index: 4, type: 'delete', howMany: 2 }
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+ ] );
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+ } );
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+
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+ it( 'should diff replacement in the middle (repetitive substring)', () => {
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+ // Do not check compatibility with 'diffToChanges' as it generates:
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+ // [ { index: 2, type: 'insert', values: [ '1', '2' ] }, { index: 7, type: 'insert', values: [ '5' ] } ]
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+ expectDiff( '12345', '12123455', [
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+ { index: 2, type: 'insert', values: [ '1', '2', '3', '4', '5' ] },
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+ { index: 7, type: 'delete', howMany: 2 }
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+ ], false );
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+ } );
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+
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+ it( 'should diff replacement of duplicated content', () => {
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+ // Do not check compatibility with 'diffToChanges' as it has changes in reveres order ('delete', 'insert') here.
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+ expectDiff( '123123', '123333', [
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+ { index: 3, type: 'insert', values: '33'.split( '' ) },
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+ { index: 5, type: 'delete', howMany: 2 }
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+ ], false );
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+ } );
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+ } );
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+} );
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+
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+function expectDiff( oldText, newText, expected, checkDiffToChangesCompatibility = true ) {
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+ const result = fastDiff( oldText, newText );
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+
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+ expect( result ).to.deep.equals( expected );
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+
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+ if ( checkDiffToChangesCompatibility ) {
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+ expect( result ).to.deep.equals( diffToChanges( diff( oldText, newText ), newText ), 'diffToChanges compatibility' );
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+ }
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+}
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