describe('TaskQueue', function() {
	var TaskQueue = $.fullCalendar.TaskQueue;

	it('executes first task immediately', function() {
		var q = new TaskQueue();
		var ops = [];

		q.on('start', function() {
			ops.push('start-event');
		});
		q.on('stop', function() {
			ops.push('stop-event');
		});

		q.queue(function() {
			ops.push('run1');
		});

		expect(ops).toEqual([ 'start-event', 'run1', 'stop-event' ]);
	});

	it('executes second task after first has fully completed', function() {
		var q = new TaskQueue();
		var ops = [];

		q.on('start', function() {
			ops.push('start-event');
		});
		q.on('stop', function() {
			ops.push('stop-event');
		});

		q.queue(function() {
			ops.push('start1');

			q.queue(function() {
				ops.push('run2');
			});

			ops.push('stop1');
		});

		expect(ops).toEqual([ 'start-event', 'start1', 'stop1', 'run2', 'stop-event' ]);
	});

	it('executes second task after first promise resolves', function(done) {
		var q = new TaskQueue();
		var ops = [];

		q.on('start', function() {
			ops.push('start-event');
		});
		q.on('stop', function() {
			ops.push('stop-event');
		});

		q.queue(function() {
			var deferred = $.Deferred();

			ops.push('start1');

			q.queue(function() {
				ops.push('run2');
			});

			setTimeout(function() {
				ops.push('stop1');
				deferred.resolve();
			}, 100);

			return deferred.promise();
		});

		setTimeout(function() {
			expect(ops).toEqual([ 'start-event', 'start1', 'stop1', 'run2', 'stop-event' ]);
			done();
		}, 200);
	});

	it('serially executes two tasks, the first with a promise', function(done) {
		var q = new TaskQueue();
		var ops = [];

		q.on('start', function() {
			ops.push('start-event');
		});
		q.on('stop', function() {
			ops.push('stop-event');
		});

		q.queue(function() {
			var deferred = $.Deferred();

			ops.push('start1');

			setTimeout(function() {
				ops.push('stop1');
				deferred.resolve();
			}, 100);

			return deferred.promise();
		}, function() {
			ops.push('run2');
		});

		setTimeout(function() {
			expect(ops).toEqual([ 'start-event', 'start1', 'stop1', 'run2', 'stop-event' ]);
			done();
		}, 200);
	});

	describe('pausing', function() {

		it('prevents task from rendering', function() {
			var q = new TaskQueue();
			var ops = [];

			q.on('start', function() {
				ops.push('start-event');
			});
			q.on('stop', function() {
				ops.push('stop-event');
			});

			q.pause();

			q.queue(function() {
				ops.push('run1');
			});
			q.queue(function() {
				ops.push('run2');
			});

			expect(ops).toEqual([ ]);

			q.resume();

			expect(ops).toEqual([ 'start-event', 'run1', 'run2', 'stop-event' ]);
		});
	});
});