( function ( mw, $ ) {
	QUnit.module( 'mmv', QUnit.newMwEnvironment() );

	QUnit.test( 'Metadata div is only animated once', 4, function ( assert ) {
		localStorage.removeItem( 'mmv.hasOpenedMetadata' );

		var viewer = new mw.MultimediaViewer(),
			backupAnimation = $.fn.animate,
			animationRan = false;

		$.fn.animate = function () {
			animationRan = true;
			return this;
		};

		viewer.animateMetadataDivOnce();
		assert.strictEqual( viewer.hasAnimatedMetadata, true, 'The first call to animateMetadataDivOnce set hasAnimatedMetadata to true' );
		assert.strictEqual( animationRan, true, 'The first call to animateMetadataDivOnce led to an animation' );

		animationRan = false;
		viewer.animateMetadataDivOnce();
		assert.strictEqual( viewer.hasAnimatedMetadata, true, 'The second call to animateMetadataDivOnce did not change the value of hasAnimatedMetadata' );
		assert.strictEqual( animationRan, false, 'The second call to animateMetadataDivOnce did not lead to an animation' );

		$.fn.animate = backupAnimation;
	} );

	QUnit.test( 'eachPrealoadableLightboxIndex()', 11, function ( assert ) {
		var viewer = mw.mediaViewer,
			oldLightbox,
			oldPreloadDistance,
			oldPosition,
			oldThumbs,
			expectedIndices,
			i;

		oldLightbox = viewer.lightbox;
		viewer.lightbox = viewer.lightbox || {}; // might not be set up at this point
		oldPreloadDistance = viewer.preloadDistance;
		oldPosition = viewer.lightbox.currentIndex;
		oldThumbs = viewer.thumbs;

		viewer.preloadDistance = 3;
		viewer.thumbs = [];

		// 0..10
		for ( i = 0; i < 11; i++ ) {
			viewer.thumbs.push( { image : false } );
		}

		viewer.lightbox.currentIndex = 2;
		i = 0;
		expectedIndices = [2, 3, 1, 4, 0, 5];
		viewer.eachPrealoadableLightboxIndex( function( index ) {
			assert.strictEqual( index, expectedIndices[i++], 'preload on left edge');
		} );

		viewer.lightbox.currentIndex = 9;
		i = 0;
		expectedIndices = [9, 10, 8, 7, 6];
		viewer.eachPrealoadableLightboxIndex( function( index ) {
			assert.strictEqual( index, expectedIndices[i++], 'preload on right edge');
		} );

		viewer.lightbox = oldLightbox;
		viewer.preloadDistance = oldPreloadDistance;
		viewer.thumbs = oldThumbs;

		if ( viewer.lightbox ) {
			viewer.lightbox.currentIndex = oldPosition;
		}
	} );
}( mediaWiki, jQuery ) );