text: ( function ( mw ) {
  	QUnit.module( 'mmv.ThumbnailWidthCalculator', QUnit.newMwEnvironment() );
  
  	QUnit.test( 'ThumbnailWidthCalculator constructor sanity check', function ( assert ) {
  		var badWidthBuckets = [],
  			goodWidthBuckets = [ 1 ],
  			thumbnailWidthCalculator;
  
  		thumbnailWidthCalculator = new mw.mmv.ThumbnailWidthCalculator();
  		assert.ok( thumbnailWidthCalculator, 'constructor with no argument works' );
  
  		thumbnailWidthCalculator = new mw.mmv.ThumbnailWidthCalculator( {} );
  		assert.ok( thumbnailWidthCalculator, 'constructor with empty option argument works' );
  
  		thumbnailWidthCalculator = new mw.mmv.ThumbnailWidthCalculator( {
  			widthBuckets: goodWidthBuckets
  		} );
  		assert.ok( thumbnailWidthCalculator, 'constructor with non-default buckets works' );
  
  		try {
  			thumbnailWidthCalculator = new mw.mmv.ThumbnailWidthCalculator( {
  				widthBuckets: badWidthBuckets
  			} );
  		} catch ( e ) {
  			assert.ok( e, 'constructor with empty bucket list throws exception' );
  		}
  	} );
  
  	QUnit.test( 'findNextBucket() test', function ( assert ) {
  		var thumbnailWidthCalculator = new mw.mmv.ThumbnailWidthCalculator( {
  			widthBuckets: [ 100, 200 ]
  		} );
  
  		assert.strictEqual( thumbnailWidthCalculator.findNextBucket( 50 ), 100,
  			'return first bucket for value smaller than all buckets' );
  
  		assert.strictEqual( thumbnailWidthCalculator.findNextBucket( 300 ), 200,
  			'return last bucket for value larger than all buckets' );
  
  		assert.strictEqual( thumbnailWidthCalculator.findNextBucket( 150 ), 200,
  			'return next bucket for value between two buckets' );
  
  		assert.strictEqual( thumbnailWidthCalculator.findNextBucket( 100 ), 100,
  			'return bucket for value equal to that bucket' );
  	} );
  
  	// Old tests for the default bucket sizes. Preserved because why not.
  	QUnit.test( 'We get sane image sizes when we ask for them', function ( assert ) {
  		var twc = new mw.mmv.ThumbnailWidthCalculator();
  
  		assert.strictEqual( twc.findNextBucket( 200 ), 320, 'Low target size gives us lowest possible size bucket' );
  		assert.strictEqual( twc.findNextBucket( 320 ), 320, 'Asking for a bucket size gives us exactly that bucket size' );
  		assert.strictEqual( twc.findNextBucket( 320.00001 ), 800, 'Asking for greater than an image bucket definitely gives us the next size up' );
  		assert.strictEqual( twc.findNextBucket( 2000 ), 2560, 'The image bucketing also works on big screens' );
  		assert.strictEqual( twc.findNextBucket( 3000 ), 2880, 'The image bucketing also works on REALLY big screens' );
  	} );
  
  	QUnit.test( 'findNextBucket() test with unordered bucket list', function ( assert ) {
  		var thumbnailWidthCalculator = new mw.mmv.ThumbnailWidthCalculator( {
  			widthBuckets: [ 200, 100 ]
  		} );
  
  		assert.strictEqual( thumbnailWidthCalculator.findNextBucket( 50 ), 100,
  			'return first bucket for value smaller than all buckets' );
  
  		assert.strictEqual( thumbnailWidthCalculator.findNextBucket( 300 ), 200,
  			'return last bucket for value larger than all buckets' );
  
  		assert.strictEqual( thumbnailWidthCalculator.findNextBucket( 150 ), 200,
  			'return next bucket for value between two buckets' );
  	} );
  
  	QUnit.test( 'calculateFittingWidth() test', function ( assert ) {
  		var boundingWidth = 100,
  			boundingHeight = 200,
  			thumbnailWidthCalculator = new mw.mmv.ThumbnailWidthCalculator( { widthBuckets: [ 1 ] } );
  
  		// 50x10 image in 100x200 box - need to scale up 2x
  		assert.strictEqual(
  			thumbnailWidthCalculator.calculateFittingWidth( boundingWidth, boundingHeight, 50, 10 ),
  			100, 'fit calculation correct when limited by width' );
  
  		// 10x100 image in 100x200 box - need to scale up 2x
  		assert.strictEqual(
  			thumbnailWidthCalculator.calculateFittingWidth( boundingWidth, boundingHeight, 10, 100 ),
  			20, 'fit calculation correct when limited by height' );
  
  		// 10x20 image in 100x200 box - need to scale up 10x
  		assert.strictEqual(
  			thumbnailWidthCalculator.calculateFittingWidth( boundingWidth, boundingHeight, 10, 20 ),
  			100, 'fit calculation correct when same aspect ratio' );
  	} );
  
  	QUnit.test( 'calculateWidths() test', function ( assert ) {
  		var boundingWidth = 100,
  			boundingHeight = 200,
  			thumbnailWidthCalculator = new mw.mmv.ThumbnailWidthCalculator( {
  				widthBuckets: [ 8, 16, 32, 64, 128, 256, 512 ],
  				devicePixelRatio: 1
  			} ),
  			widths;
  
  		// 50x10 image in 100x200 box - image size should be 100x20, thumbnail should be 128x25.6
  		widths = thumbnailWidthCalculator.calculateWidths( boundingWidth, boundingHeight, 50, 10 );
  		assert.strictEqual( widths.cssWidth, 100, 'css width is correct when limited by width' );
  		assert.strictEqual( widths.cssHeight, 20, 'css height is correct when limited by width' );
  		assert.strictEqual( widths.real, 128, 'real width is correct when limited by width' );
  
  		// 10x100 image in 100x200 box - image size should be 20x200, thumbnail should be 32x320
  		widths = thumbnailWidthCalculator.calculateWidths( boundingWidth, boundingHeight, 10, 100 );
  		assert.strictEqual( widths.cssWidth, 20, 'css width is correct when limited by height' );
  		assert.strictEqual( widths.cssHeight, 200, 'css height is correct when limited by width' );
  		assert.strictEqual( widths.real, 32, 'real width is correct when limited by height' );
  
  		// 10x20 image in 100x200 box - image size should be 100x200, thumbnail should be 128x256
  		widths = thumbnailWidthCalculator.calculateWidths( boundingWidth, boundingHeight, 10, 20 );
  		assert.strictEqual( widths.cssWidth, 100, 'css width is correct when same aspect ratio' );
  		assert.strictEqual( widths.cssHeight, 200, 'css height is correct when limited by width' );
  		assert.strictEqual( widths.real, 128, 'real width is correct when same aspect ratio' );
  	} );
  
  	QUnit.test( 'calculateWidths() test with non-standard device pixel ratio', function ( assert ) {
  		var boundingWidth = 100,
  			boundingHeight = 200,
  			thumbnailWidthCalculator = new mw.mmv.ThumbnailWidthCalculator( {
  				widthBuckets: [ 8, 16, 32, 64, 128, 256, 512 ],
  				devicePixelRatio: 2
  			} ),
  			widths;
  
  		// 50x10 image in 100x200 box - image size should be 100x20, thumbnail should be 256x51.2
  		widths = thumbnailWidthCalculator.calculateWidths( boundingWidth, boundingHeight, 50, 10 );
  		assert.strictEqual( widths.cssWidth, 100, 'css width is correct when limited by width' );
  		assert.strictEqual( widths.cssHeight, 20, 'css height is correct when limited by width' );
  		assert.strictEqual( widths.real, 256, 'real width is correct when limited by width' );
  
  		// 10x100 image in 100x200 box - image size should be 20x200, thumbnail should be 64x640
  		widths = thumbnailWidthCalculator.calculateWidths( boundingWidth, boundingHeight, 10, 100 );
  		assert.strictEqual( widths.cssWidth, 20, 'css width is correct when limited by height' );
  		assert.strictEqual( widths.cssHeight, 200, 'css height is correct when limited by width' );
  		assert.strictEqual( widths.real, 64, 'real width is correct when limited by height' );
  
  		// 10x20 image in 100x200 box - image size should be 100x200, thumbnail should be 256x512
  		widths = thumbnailWidthCalculator.calculateWidths( boundingWidth, boundingHeight, 10, 20 );
  		assert.strictEqual( widths.cssWidth, 100, 'css width is correct when same aspect ratio' );
  		assert.strictEqual( widths.cssHeight, 200, 'css height is correct when limited by width' );
  		assert.strictEqual( widths.real, 256, 'real width is correct when same aspect ratio' );
  	} );
  }( mediaWiki ) );
  