openmct/platform/features/clock/test/services/TimerServiceSpec.js

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define([
    '../../src/services/TimerService'
], function (TimerService) {
    describe("TimerService", function () {
        var callback;
        var mockmct;
        var timerService;

        beforeEach(function () {
            callback = jasmine.createSpy('callback');
            mockmct = {
                time: { clock: jasmine.createSpy('clock') },
                objects: { observe: jasmine.createSpy('observe') }
            };
            timerService = new TimerService(mockmct);
            timerService.on('change', callback);
        });

        it("initially emits no change events", function () {
            expect(callback).not.toHaveBeenCalled();
        });

        it("reports no current timer", function () {
            expect(timerService.getTimer()).toBeUndefined();
        });

        describe("setTimer", function () {
            var testTimer;

            beforeEach(function () {
                testTimer = { name: "I am some timer; you are nobody." };
                timerService.setTimer(testTimer);
            });

            it("emits a change event", function () {
                expect(callback).toHaveBeenCalled();
            });

            it("reports the current timer", function () {
                expect(timerService.getTimer()).toBe(testTimer);
            });

            it("observes changes to an object", function () {
                var newTimer = { name: "I am another timer." };
                expect(mockmct.objects.observe).toHaveBeenCalledWith(
                    testTimer,
                    '*',
                    jasmine.any(Function)
                );
                mockmct.objects.observe.mostRecentCall.args[2](newTimer);
                expect(timerService.getTimer()).toBe(newTimer);
            });
        });
    });
});