edx-platform/xmodule/js/spec/video/async_process_spec.js

(function(require) {
    require(
['video/00_async_process.js'],
function(AsyncProcess) {
    var getArrayNthLength = function(n, multiplier) {
            var result = [],
                mul = multiplier || 1;

            for (var i = 0; i < n; i++) {
                result[i] = i * mul;
            }

            return result;
        },
        items = getArrayNthLength(1000);

    describe('AsyncProcess', function() {
        it('Array is processed successfully', function(done) {
            var processedArray,
                expectedArray = getArrayNthLength(1000, 2),
                process = function(item) {
                    return 2 * item;
                };

            AsyncProcess.array(items, process).done(function(result) {
                processedArray = result;
            });

            jasmine.waitUntil(function() {
                return processedArray;
            }).then(function() {
                expect(processedArray).toEqual(expectedArray);
            }).always(done);
        });

        it('If non-array is passed, error callback is called', function(done) {
            var isError,
                process = function() {};

            AsyncProcess.array('string', process).fail(function() {
                isError = true;
            });

            jasmine.waitUntil(function() {
                return isError;
            }).then(function() {
                expect(isError).toBeTruthy();
            }).always(done);
        });

        it('If an empty array is passed, returns initial array', function(done) {
            var processedArray,
                process = function() {};

            AsyncProcess.array([], process).done(function(result) {
                processedArray = result;
            });

            jasmine.waitUntil(function() {
                return processedArray;
            }).then(function() {
                expect(processedArray).toEqual([]);
            }).always(done);
        });

        it('If no process function passed, returns initial array', function(done) {
            var processedArray;

            AsyncProcess.array(items).done(function(result) {
                processedArray = result;
            });

            jasmine.waitUntil(function() {
                return processedArray;
            }).then(function() {
                expect(processedArray).toEqual(items);
            }).always(done);
        });
    });
});
}(require));