112 lines
3.2 KiB
JavaScript
112 lines
3.2 KiB
JavaScript
describe('EventEmitter', function() {
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beforeEach(function() {
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this.spy = jasmine.createSpy();
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this.target = _.mixin({}, EventEmitter);
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});
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it('methods should be chainable', function() {
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expect(this.target.onSync()).toEqual(this.target);
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expect(this.target.onAsync()).toEqual(this.target);
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expect(this.target.off()).toEqual(this.target);
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expect(this.target.trigger()).toEqual(this.target);
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});
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it('#on should take the context a callback should be called in', function() {
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var context = { val: 3 }, cbContext;
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this.target.onSync('xevent', setCbContext, context).trigger('xevent');
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waitsFor(assertCbContext, 'callback was called in the wrong context');
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function setCbContext() { cbContext = this; }
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function assertCbContext() { return cbContext === context; }
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});
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it('#onAsync callbacks should be invoked asynchronously', function() {
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this.target.onAsync('event', this.spy).trigger('event');
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expect(this.spy.callCount).toBe(0);
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waitsFor(assertCallCount(this.spy, 1), 'the callback was not invoked');
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});
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it('#onSync callbacks should be invoked synchronously', function() {
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this.target.onSync('event', this.spy).trigger('event');
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expect(this.spy.callCount).toBe(1);
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});
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it('#off should remove callbacks', function() {
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this.target
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.onSync('event1 event2', this.spy)
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.onAsync('event1 event2', this.spy)
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.off('event1 event2')
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.trigger('event1 event2');
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waits(100);
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runs(assertCallCount(this.spy, 0));
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});
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it('methods should accept multiple event types', function() {
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this.target
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.onSync('event1 event2', this.spy)
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.onAsync('event1 event2', this.spy)
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.trigger('event1 event2');
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expect(this.spy.callCount).toBe(2);
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waitsFor(assertCallCount(this.spy, 4), 'the callback was not invoked');
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});
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it('the event type should be passed to the callback', function() {
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this.target
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.onSync('sync', this.spy)
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.onAsync('async', this.spy)
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.trigger('sync async');
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waitsFor(assertArgs(this.spy, 0, ['sync']), 'bad args');
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waitsFor(assertArgs(this.spy, 1, ['async']), 'bad args');
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});
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it('arbitrary args should be passed to the callback', function() {
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this.target
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.onSync('event', this.spy)
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.onAsync('event', this.spy)
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.trigger('event', 1, 2);
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waitsFor(assertArgs(this.spy, 0, ['event', 1, 2]), 'bad args');
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waitsFor(assertArgs(this.spy, 1, ['event', 1, 2]), 'bad args');
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});
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it('callback execution should be cancellable', function() {
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var cancelSpy = jasmine.createSpy().andCallFake(cancel);
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this.target
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.onSync('one', cancelSpy)
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.onSync('one', this.spy)
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.onAsync('two', cancelSpy)
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.onAsync('two', this.spy)
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.onSync('three', cancelSpy)
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.onAsync('three', this.spy)
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.trigger('one two three');
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waitsFor(assertCallCount(cancelSpy, 3));
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waitsFor(assertCallCount(this.spy, 0));
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function cancel() { return false; }
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});
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function assertCallCount(spy, expected) {
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return function() { return spy.callCount === expected; };
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}
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function assertArgs(spy, call, expected) {
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return function() {
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var env = jasmine.getEnv(),
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actual = spy.calls[call] ? spy.calls[call].args : undefined;
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return env.equals_(actual, expected);
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};
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}
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});
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