间谍必须在之前的函数或规范中创建 angular

Question

我有这个私有函数：

 private GetChargesByClient(clientId: number): Observable<any[]> {
const ds = new Date();
const dateTocompare = new Date(ds.setFullYear(ds.getFullYear() - 1));
return this.getCharges(id).pipe(map(res => res.filter(x => x.date >= dateTocompare)));

}

我为它写了一个单元测试:

describe('getAllCharges', () => {
 const _response: any[] =[
    {
        "type": "Ongoing ",
        "date": 1562108400000,
        "totalPayment": "11.54",
        "document": 37
    },
    {
        "type": "Ongoing ",
        "date": 1559689200000,
        "totalPayment": "11.04",
        "document": 37
    }
];

 it('then', (done) => {
      const service: chargesService = TestBed.get(chargesService);
      spyOn<any>(service, 'getCharges').and.returnValue(of(_response));
      const res = service['GetChargesByClient'](130).subscribe(() => done);
      expect(res).toBe(null);
    });
    });

但是当我运行测试时我得到一个错误

spies must be created in a before function or a spec

我有其他私有方法测试，它们运行 OK。谁能发现我遗漏的任何东西

Answer 1

有一件事，res 将是一个订阅对象，而不是发出的值（因此，不是 null）。另一个，我不确定这里 done 的目的是什么（这可能会让 Jasmine 失望）。

尝试

it('could use a more descriptive expectation', () => {
    const service: chargesService = TestBed.get(chargesService);
    spyOn<any>(service, 'getCharges').and.returnValue(of(_response));

    service['GetChargesByClient'](130)
        .subscribe((result) => expect(result).toBeNull());
});

间谍必须在之前的函数或规范中创建 angular

spies must be created in a before function or a spec angular

unit-testing

jasmine

angular