[英]Angular unit test, how to test a subject as observable
I am trying to test a subject as observable, but it is not working as expected我正在尝试测试一个可观察的主题,但它没有按预期工作
For simplistic I have removed extra logic inside getService2Test subscribe为了简单起见,我删除了 getService2Test 订阅中的额外逻辑
Below is my function in service class下面是我的 function 在职 class
getTest():Observable<string>{
let subject = new Subject<string>();
service2.getService2Test().subscribe(result=>{
subject.next(result.success); // result.success = "testing"
subject.complete();
});
return subject.asObservable();
}
Below is my test case下面是我的测试用例
it('Testing getTest()',()=>{
spyOn(service2,'getService2Test').and.returnValue(of("success"));
service.getTest().subscribe((result)=>{
expect(result).toEqual("testing"); // never gets invoked in testing
console.log("Output result: "+result); // not able to see any message
});
});
The code inside subscribe never executed. subscribe 中的代码从未执行过。 I am also getting a warn message of '... has no expectations.'
我还收到一条警告消息“...没有期望。”
Your test case doesn't wait for your subscribe and is instantly finished.您的测试用例不会等待您的订阅并立即完成。 To fix this implement the resolve callback like this:
要解决此问题,请像这样实现解析回调:
it('Testing getTest()', done => {
spyOn(service2,'getService2Test').and.returnValue(of("success"));
service.getTest().subscribe((result)=>{
// verify results
done();
});
});
Thanks Felix, I have tested and below code works谢谢 Felix,我已经测试过并且下面的代码有效
it('Testing getTest()', done => {
spyOn(service2,'getService2Test').and.returnValue(of("success").pipe(delay(0)));
service.getTest().subscribe((result)=>{
console.log(result); // Prints my results
done();
});
});
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