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QUnit.test( 'background', function( assert ) {
'use strict';
// from Modernizr
var supportsMultiBGs = ( function() {
var style = document.createElement('a').style;
style.cssText = 'background:url(https://),url(https://),red url(https://)';
return (/(url\s*\(.*?){3}/).test(style.background);
})();
var multiBGCount = supportsMultiBGs ? 3 : 0;
var done = assert.async( 14 + multiBGCount );
var imgLoad0 = imagesLoaded( '#background .tulip', { background: true }, function() {
assert.ok( true, 'callback triggered on .orange-tree');
done();
});
assert.equal( imgLoad0.images.length, 1, '1 image on .images' );
imgLoad0.on( 'progress', function( instance, image, element ) {
assert.ok( element.nodeName == 'DIV', 'progress; element is div');
assert.ok( image.isLoaded, 'progress; image.isLoaded');
done();
});
var imgLoad1 = imagesLoaded( '#background .thunder-cloud', { background: true }, function() {
assert.ok( true, 'callback triggered on .thunder-cloud');
done();
});
assert.equal( imgLoad1.images.length, 1, '1 image on .images' );
// multiple backgrounds
var imgLoad2 = imagesLoaded( '#background .multi', { background: true }, function() {
assert.ok( true, 'callback triggered on .multi');
done();
});
assert.equal( imgLoad2.images.length, multiBGCount, 'correct multiple BG count on .images' );
// multiple elements
var imgLoad3 = imagesLoaded( '#background .bg-box', { background: true }, function() {
assert.ok( true, 'callback triggered on .bg-box');
var count = 5 + multiBGCount;
assert.equal( imgLoad3.images.length, count, count + ' images on .bg-box' );
done();
});
imgLoad3.on('progress', function( instance, image/*, element */) {
assert.ok( true, 'progress on .bg-box; ' + image.img.src );
assert.equal( image.isLoaded, true, 'image.isLoaded == true' );
done();
});
// background and <img> children
var imgLoad4 = imagesLoaded( '#background .gulls', { background: true } );
assert.equal( imgLoad4.images.length, 3, '3 images: 1 background and 2 <img>' );
imgLoad4.on( 'progress', function( instance, image ) {
assert.equal( image.isLoaded, true, 'image is loaded' );
done();
});
// child background selector
var imgLoad5 = imagesLoaded( '#background', { background: '.bg-box' }, function() {
var count = 5 + multiBGCount;
assert.equal( imgLoad5.images.length, count,
count + ' images on .bg-box, with {background: .bg-box}' );
done();
});
});
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