角度单元测试:未调用函数

我试图对我的服务进行单元测试,但似乎无法使其正常工作。概念是当 setEmployees() 如果使用空数组调用,该服务将从服务器获取员工。

服务

  setEmployees( employees : Employee[] ) {
    console.log("Setting employees...", employees)
    if (employees && employees.length) {
      this.employees.next(employees)
      this.storage.set('employees', employees);
    } else {
      this.getEmployees().subscribe()
    }
  }

  getEmployees() {
    console.log("getting employees...")
    let url = `${this.base_url}/employees`;
    return this.http.get<Employee[]>(url).pipe(
      tap(employees => {
        console.log("got em", employees)
        this.setEmployees(employees)
        this.storage.set('employees', employees)
      })
    )
  }

  returnEmployees() : IEmployee[] {
    return Object.assign([], this.employees.getValue())
  }

测验

it('should set employees correctly', fakeAsync(() => {
  let dummy = [{id: 1, name: 'Jeremy'}, {id: 2, name: 'Paige'}]
  spyOn(employeeService, 'getEmployees').and.returnValue(of(dummy));
  employeeService.setEmployees([]);
  tick();
  expect(employeeService.returnEmployees()).toEqual(dummy)
}))

测试响应

Expected $.length = 0 to equal 2.
Expected $[0] = undefined to equal Object({ id: 1, name: 'Jeremy' }).
Expected $[1] = undefined to equal Object({ id: 2, name: 'Paige' }).

同样值得注意的是 console.log() 语句没有按预期顺序出现。运行此测试时,我在控制台中看到以下内容:

getting employees...
Setting employees... []

...当我期待看到:

Setting employees... []
getting employees...
got em [{id: 1, name: 'Jeremy'}, {id: 2, name: 'Paige'}]
Setting employees... [{id: 1, name: 'Jeremy'}, {id: 2, name: 'Paige'}]

很明显,有些事情并没有像预期的那样发生,但我不确定问题出在哪里。