[英]How to test that a function has been called after an event was fired?
在FooView
触发了自定义事件..
// views/foo_view.js
this.trigger("something:happened");
关联的FooController
绑定一个处理程序来处理事件......
// controller/foo_controller.js
initialize: function() {
this.fooView = new FooView();
this.fooView.bind("something:happened", this.onSomethingHappened, this);
}
onSomethingHappened: function(event) {
// Do something else.
}
为了测试事件处理,我将为Jasmine编写以下测试:
it("should do something else when something happens", function() {
var fooController = new FooController();
spyOn(fooController, "onSomethingHappened");
fooController.fooView.trigger("something:happened");
expect(fooController.onSomethingHappened).toHaveBeenCalled();
});
虽然,测试失败..
FooView should do something else when something happens.
Expected spy onSomethingHappened to have been called.
Error: Expected spy onSomethingHappened to have been called.
at new jasmine.ExpectationResult (http://localhost:8888/__JASMINE_ROOT__/jasmine.js:114:32)
at null.toHaveBeenCalled (http://localhost:8888/__JASMINE_ROOT__/jasmine.js:1235:29)
at null.<anonymous> (http://localhost:8888/assets/foo_spec.js?body=true:225:47)
at jasmine.Block.execute (http://localhost:8888/__JASMINE_ROOT__/jasmine.js:1064:17)
at jasmine.Queue.next_ (http://localhost:8888/__JASMINE_ROOT__/jasmine.js:2096:31)
at jasmine.Queue.start (http://localhost:8888/__JASMINE_ROOT__/jasmine.js:2049:8)
at jasmine.Spec.execute (http://localhost:8888/__JASMINE_ROOT__/jasmine.js:2376:14)
at jasmine.Queue.next_ (http://localhost:8888/__JASMINE_ROOT__/jasmine.js:2096:31)
at onComplete (http://localhost:8888/__JASMINE_ROOT__/jasmine.js:2092:18)
at jasmine.Spec.finish (http://localhost:8888/__JASMINE_ROOT__/jasmine.js:2350:5)
测试失败是否因为事件执行时间比预期长?
问题是您在函数绑定到事件后监视函数。 当 jasmine 创建一个 spy 时,它将用另一个函数替换您监视的函数。
那么这里发生的是原始函数绑定到事件
this.fooView.bind("something:happened", this.onSomethingHappened, this);
之后,原始函数被 spy 替换,但这不会对您传递给bind
函数的函数产生任何影响。
解决方案是在创建新实例之前监视FooController.prototype.onSomethingHappened
:
it("should do something else when something happens", function() {
var onSomethingHappenedSpy = spyOn(FooController.prototype, "onSomethingHappened");
var fooController = new FooController();
fooController.fooView.trigger("something:happened");
expect(onSomethingHappenedSpy).toHaveBeenCalled();
});
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