类型'()=>上不存在如何解决“呼叫"的方法.任何' [英] How to resolve 'calls' does not exist on type '() => any'
问题描述
测试我的angular2应用.我尝试设置一个间谍,然后检查它被调用了多少次.我仍然不断收到此TS错误
Testing my angular2 app. I try and set a spy and then check how many times it has been called. I keep getting this TS error though
类型'()=> any'上不存在属性'calls'.
Property 'calls' does not exist on type '() => any'.
如何解决此错误?
How Do I resolve this error?
describe('ssh Service', () => {
let ref:SshRefService;
beforeEach(() => {
TestBed.configureTestingModule({
providers: [
{ provide: SshRefService, useClass: refClass },
]
});
});
beforeEach(inject([SshRefService], (sshRef:SshRefService) => {
ref = sshRef
spyOn(ref, 'getClient').and.returnValue(true)
}));
it('should mock an observable', () => {
//service.list() calls ref.getClient() internally
expect(service.list('/share')).toEqual(Observable.of(mockFileList));
expect(ref.getClient.calls.count()).toBe(1);
});
});
推荐答案
看起来SshRefService
当前定义了getClient() : any
.结果,它正确地引发了此错误.之所以发生这种情况,是因为模拟过程用Spy替换了属性/方法,但是Typescript无法知道发生了什么.
It looks like SshRefService
currently defines getClient() : any
. As a result, it's correctly throwing this error. This is happening because the mocking process replaces the property/method with the Spy, but Typescript has no way of knowing that's taken place.
由于您监视了SshRefService.getClient
,因此有两种方法可以测试它是否被调用:
Since you've spied on SshRefService.getClient
, you have two ways to test whether it's been called:
spyOn
返回一个jasmine.Spy
对象,该对象直接公开calls属性.您可以将spyOn(ref, 'getClient').and.returnValue(true)
的结果保存在示例对象上,然后像这样进行测试:
spyOn
returns a jasmine.Spy
object, which exposes the calls property directly. You can save the result of spyOn(ref, 'getClient').and.returnValue(true)
on the example object, and then test that like so:
expect(getClientSpy.calls.count()).toEqual(1)
首选(可能):您可以在对象本身的方法上运行Expect,就像这样:
Preferred (probably): You can run expect on the method on the object itself, like so:
expect(ref.getClient).toHaveBeenCalledTimes(1)
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