[英]Unit testing logic inside promise callback
I have an ES6 / Aurelia app that I am using jasmine to test. 我有一个正在使用茉莉花测试的ES6 / Aurelia应用程序。 The method I am trying to test looks something like this:
我尝试测试的方法如下所示:
update() {
let vm = this;
vm.getData()
.then((response) => {
vm.processData(response);
});
}
Where this.getData
is a function that returns a promise. 其中
this.getData
是一个返回诺言的函数。
My spec file looks something like this: 我的规格文件看起来像这样:
describe('my service update function', () => {
it('it will call the other functions', () => {
myService = new MyService();
spyOn(myService, 'getData').and.callFake(function() {
return new Promise((resolve) => { resolve(); });
});
spyOn(myService, 'processData').and.callFake(function() { return; });
myService.update();
// this one passes
expect(myService.getData).toHaveBeenCalled();
// this one fails
expect(myService.processData).toHaveBeenCalled();
});
});
I understand why this fails - promises are asynchronous and it hasn't been resolved by the time it hits the expect. 我知道为什么会失败-承诺是异步的,并且在达到期望时尚未解决。
How can I push the promises to resolve from my test so that I can test the code inside the call back? 我如何才能将承诺从测试中分解出来,以便可以在回调中测试代码?
jsfiddle of failed test: http://jsfiddle.net/yammerade/2aap5u37/6/ 失败的jsfiddle: http : //jsfiddle.net/yammerade/2aap5u37/6/
I got a workaround running by returning an object that behaves like a promise instead of an actual promise 我通过返回一个行为类似于承诺而不是实际承诺的对象来解决问题
describe('my service update function', () => {
it('it will call the other functions', () => {
myService = new MyService();
spyOn(myService, 'getData').and.returnValue({
then(callback) {
callback();
}
});
spyOn(myService, 'processData').and.callFake(function() { return; });
myService.update();
// this one passes
expect(myService.getData).toHaveBeenCalled();
// this one fails
expect(myService.processData).toHaveBeenCalled();
});
});
Fiddle here: http://jsfiddle.net/yammerade/9rLrzszm/2/ 在这里提琴: http : //jsfiddle.net/yammerade/9rLrzszm/2/
Is there anything wrong with doing it this way? 这样做有什么问题吗?
it((done) => {
// call done, when you are done
spyOn(myService, 'processData').and.callFake(function() {
expect(myService.processData).toHaveBeenCalled();
done();
});
})
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