Unit tests for AsyncQueue

AsyncQueueSpec.js

    describe('run()', function() {

        var realNextFrame, realCancelFrame;

        beforeEach(function() {
            jasmine.clock().install();
            jasmine.RequestAnimationFrame.install();
            realNextFrame = window.nextFrame;
            realCancelFrame = window.cancelFrame;
            window.nextFrame = window.requestAnimationFrame;
            window.cancelFrame = window.cancelAnimationFrame;
        });

        afterEach(function() {
            jasmine.clock().uninstall();
            jasmine.RequestAnimationFrame.uninstall();
            window.nextFrame = realNextFrame;
            window.cancelFrame = realCancelFrame;
        });

        it('executes queue in order when called with the "frame" timeout', function() {
            var callback1 = {
                fn: function() { },
                timeout: 'frame'
            };
            var callback2 = {
                fn: function() { },
                timeout: 'frame'
            };
            var callback3 = {
                fn: function() { },
                timeout: 3
            };

            var fnCallback1 = spyOn(callback1, 'fn');
            var fnCallback2 = spyOn(callback2, 'fn');
            var fnCallback3 = spyOn(callback3, 'fn');

            var queue = new AsyncQueue();
            queue.add(callback1);
            queue.add(callback2);
            queue.add(callback3);

            queue.run();

            jasmine.RequestAnimationFrame.tick();
            expect(callback1.fn).toHaveBeenCalled();
            expect(callback2.fn).not.toHaveBeenCalled();
            expect(callback3.fn).not.toHaveBeenCalled();

            jasmine.RequestAnimationFrame.tick();
            expect(callback1.fn).toHaveBeenCalled();
            expect(callback2.fn).toHaveBeenCalled();
            expect(callback3.fn).not.toHaveBeenCalled();

            jasmine.clock().tick(3);
            expect(callback1.fn).toHaveBeenCalled();
            expect(callback2.fn).toHaveBeenCalled();
            expect(callback3.fn).toHaveBeenCalled();
        });
});