Karma 错误：预期有一个条件匹配请求

Question

我看过很多关于这个错误的帖子，但其中大部分似乎是由参数引起的。 我正在调用 GetAll API 方法，它不应该有任何参数。

以下是我的代码：

我已经导入了所需的服务和模块：

import {EmployeeService} from '../employee.service';
import { SalaryService } from '../salary.service';
import { TaxationService } from '../taxation.service';
import { HttpClientModule , HttpClient, HttpHandler} from '@angular/common/http';
import { HttpTestingController ,HttpClientTestingModule} from '@angular/common/http/testing'; 

在我的描述中，我创建了所需的服务实例并在需要的地方注入了它们：

let httpClient: HttpClient;
let httpTestingMockController: HttpTestingController;
let employeeService: EmployeeService;
let salaryServiceSpy: jasmine.SpyObj<SalaryService>;

beforeEach(async(() => {

TestBed.configureTestingModule({
  imports: [HttpClientTestingModule],
  providers: [EmployeeService, HttpClientModule, HttpClient, HttpHandler],
  declarations: [ EmployeeComponent ]
})
.compileComponents();

httpClient = TestBed.inject(HttpClient);
httpTestingMockController = TestBed.inject(HttpTestingController);
employeeService = TestBed.inject(EmployeeService);
salaryServiceSpy = TestBed.inject(SalaryService) as jasmine.SpyObj<SalaryService>;
}));

beforeEach(() => {
fixture = TestBed.createComponent(EmployeeComponent);
component = fixture.componentInstance;
fixture.detectChanges();
httpClient = TestBed.inject(HttpClient);
httpTestingMockController = TestBed.inject(HttpTestingController);

employeeService = TestBed.inject(EmployeeService);
salaryServiceSpy = TestBed.inject(SalaryService) as jasmine.SpyObj<SalaryService>;
});


it('Should fetch a list of employees',() => {
const mockEmployeeData = [
{"id":1,"firstName":"John","lastName":"Doe","salary":10000.00,"dateJoined":
 "2020-08-30T12:59:03.4433333"}
 ];

employeeService.getAllEmployees().subscribe((result)=>{
  expect(result.length).toBe(1);
  console.warn(result.length);
  expect(result).toEqual(mockEmployeeData);
});

let req = httpTestingMockController.expectOne('https://localhost:44328/api/Employee');

expect(req.request.method).toBe("GET");
req.flush(mockEmployeeData);

});

Karma 返回以下错误：错误：预期有一个对条件“匹配 URL：https://localhost:44328/api/Employee”的匹配请求，未找到。

我错过了什么吗？