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使用createSpyObj进行单元测试

spy mocking unit-testing typescript angular

0

physicsboy · 技术社区 · 7 年前

我有一个函数调用另一个本身使用http订阅的函数,我在测试它时遇到了问题。。。

真菌成分

id = 1;

myFunct() {
  this.myService.delete(this.id);
}

我的服务

delete(id) {
  this.http.delete(this.myUrl + '/' + id).subscribe()
}

测验

let mockService;

beforeEach(() => {
  TestBed.configureTestingModule({
    mockService = createSpyObj(['delete']);

    imports: ...,
    declarations: ...,
    providers: [
      {provide: MyService, useValue: mockService}
    ]
  }).compileComponents();

  fixture = ...;
  component = ...;
  fixture.detectChanges();
});

it('should test delete', () => {
  mockService.delete.and.returnValue({ subscribe: () => {} });
  component.myFunct();
  expect(mockService.delete).toHaveBeenCalledTimes(1);
});

我的测试返回错误:

无法读取未定义的属性“subscribe”

1 回复 | 直到 7 年前

1

3

jakubm 7 年前

常见的模式是从您的服务方法返回observable,并在组件内部订阅。

大概是这样的:

真菌成分

 id = 1;

 myFunct() { 
    this.myService.delete(this.id).subscribe( 
     (result) => console.log(result),
     (error) => console.log(error)
 };

我的服务

 delete(id): Observable<any> {
   this.http.delete(this.myUrl + '/' + id)
 }

测验

imports {of} from 'rxjs'

let mockService;

beforeEach(() => {
  TestBed.configureTestingModule({
    mockService = createSpyObj(['delete']);

    imports: ...,
    declarations: ...,
    providers: [
      {provide: MyService, useValue: mockService}
    ]
  }).compileComponents();

  fixture = ...;
  component = ...;
  fixture.detectChanges();
});

it('should test delete', () => {
  mockService.delete.and.returnValue(of({id: 1}));
  component.myFunct();
  expect(mockService.delete).toHaveBeenCalledTimes(1);
});