Question

鉴于这个简单的组成部分：

import { Component} from '@angular/core';

@Component({
  selector: 'app-component'
})
export class AppComponent {
  foo() {
    this.bar();
  }

  bar() {
    console.log('hello');
  }
}

以下测试如何在我致电bar

时验证是否已调用foo

describe('AppComponent', () => {
  let component: AppComponent;

    beforeEach(() => {
    component = new AppComponent();
  }

  it('should foobar', () => {
    component.foo();
    spyOn(component, 'bar');
    expect(component.bar).toHaveBeenCalled();
  })

}

我得到了失败的测试：

Expected spy bar to have been called.

Answer 1

您需要在调用方法之前设置间谍。 Jasmine使用wrap函数来确定它们何时被调用以及它们被调用的内容。在调用spied on方法之前必须先包装该方法以捕获信息。尝试更改您的测试以匹配以下内容：

;with FoodItem as (
  select x.Item
  from food as f
  cross apply (values (Fruit),(Vegetable),(Dairy),(Color)) as x (Item)
  where x.Item is not null
    and f.Date = @Date
)

select 
    lt.Item
from ListTable as lt
where case when exists (
    select 1 
    from FoodItem fi 
    where lt.Item = fi.Item
  ) then 1 else 0 end = @InclusionFlag

Answer 2

it("should foobar", () => {
    const spy = spyOn(component, "bar");
    component.foo();
    expect(spy).toHaveBeenCalled();
  });

测试组件方法调用另一个方法

2 个答案: