( function () { const SliderModule = require( 'ext.RevisionSlider.Slider' ), Slider = SliderModule.Slider, Revision = SliderModule.Revision, RevisionList = SliderModule.RevisionList; function makeNRevisions( n ) { const revs = []; for ( let i = 0; i < n; i++ ) { revs.push( new Revision( { revid: i + 1, user: 'Fooo' } ) ); } return new RevisionList( revs ); } QUnit.module( 'ext.RevisionSlider.Slider' ); QUnit.test( 'has revisions', function ( assert ) { const revs = new RevisionList( [ new Revision( { revid: 1 } ), new Revision( { revid: 2 } ) ] ), slider = new Slider( revs ); assert.strictEqual( slider.getRevisionList(), revs ); } ); QUnit.test( 'Given no revisions, first visible revision index is 0', function ( assert ) { const slider = new Slider( makeNRevisions( 0 ) ); assert.strictEqual( slider.getOldestVisibleRevisionIndex(), 0 ); } ); QUnit.test( 'Given 200 revisions sliding once increases oldestVisibleRevisionIndex by the number of revisions per window', function ( assert ) { const slider = new Slider( makeNRevisions( 200 ) ); slider.setRevisionsPerWindow( 50 ); slider.slide( 1 ); assert.strictEqual( slider.getOldestVisibleRevisionIndex(), 50 ); } ); QUnit.test( 'oldestVisibleRevisionIndex cannot be higher than revisions.length - revisionsPerWindow', function ( assert ) { const slider = new Slider( makeNRevisions( 75 ) ); slider.setRevisionsPerWindow( 50 ); slider.slide( 1 ); assert.strictEqual( slider.getOldestVisibleRevisionIndex(), 25 ); } ); QUnit.test( 'oldestVisibleRevisionIndex cannot be lower than 0', function ( assert ) { const slider = new Slider( makeNRevisions( 50 ) ); slider.oldestVisibleRevisionIndex = 10; slider.setRevisionsPerWindow( 20 ); slider.slide( -1 ); assert.strictEqual( slider.getOldestVisibleRevisionIndex(), 0 ); } ); }() );