Ajax 在Epic中测试Post请求

我正在尝试测试一个具有ajax post请求的epic

    test('test sucess login', async() => {
        const response = {
          username: 'admin',
        };
        nock('http://localhost:8080')
          .post('/login', Buffer.from(['admin', 'admin']).toString('base64'))
          .reply(200, response);

    const credentials = { username: 'admin', password: 'admin' };
    const action$ = ActionsObservable.of(login(credentials));

    const result$ = await loginEpic(action$);
    console.log(result$);
    result$.subscribe(actions => {
      expect(actions).toEqual([{
        type: 'LOGIN_SUCCESS',
        payload: response
      }]);
    });
 });

即使我将预期的操作类型更改为“LOGIN\u FAIL”或使对象为空，测试始终通过。我还在epic中放了一个控制台日志，它从未被调用过

export const loginEpic: Epic<LoginActionTypes | CallHistoryMethodAction > = (action$) => action$.pipe(


filter(isOfType(LOGIN)),
  mergeMap(action => login(action.payload.credentials ).pipe(
    mergeMap(ajaxResponseObject => {
      console.log('inside epic',ajaxResponseObject);
      return of(
        loginSuccess(ajaxResponseObject.response), push('/test')
      );
    }),
    catchError((error: AjaxError) => of(loginFail(error)))
  ))
);

export const loginEpic:Epic=（action$）=>action$.pipe(
过滤器（类型（登录）），
mergeMap（action=>login（action.payload.credentials）.pipe(
合并映射（ajaxResponseObject=>{
console.log（'insideepic'，ajaxResponseObject）；
归还(
登录成功（ajaxResponseObject.response），推送（'/test'）
);
}),
catchError（（错误：AjaxError）=>of（loginFail（错误）））
))
);

这是登录功能：

const login = (credentials: LoginCredentials): Observable<AjaxResponse> => {
  const { username, password } = credentials;
  return ajax({
    url: 'http://localhost:8080/authenticate',
    method: 'POST',
    headers: {
      Authorization: `Basic ${Buffer.from(`${username}:${password}`).toString('base64')}}`
    }
  });
};

const login=（凭证：LoginCredentials）：可观察=>{
const{username，password}=凭证；
返回ajax({
网址：'http://localhost:8080/authenticate',
方法：“POST”，
标题：{
授权：`Basic${Buffer.from（`${username}:${password}`）。toString（`base64'）}`
}
});
};