Angular10：服务单元测试"spec has no expectations"

Question

我有一个非常简单的服务，我想对其进行单元测试。

import { Injectable } from '@angular/core';
import { Step } from './step';

@Injectable({
  providedIn: 'root'
})
export class StepService {

  constructor() { }

  setStepDone(setDoneStep: Step) {
    setDoneStep.done = !setDoneStep.done;
  }
}

我的测试是这样的：

import { TestBed } from '@angular/core/testing';
import { StepService } from './step.service';
import { Step } from './step';

describe('StepService', () => {
  let service: StepService;

  beforeEach(() => {
    TestBed.configureTestingModule({});
    service = TestBed.inject(StepService);
  });

  it('should be created', () => {
    expect(service).toBeTruthy();
  });

  it('should set the done property of a step to true when done was false and setStepDone was called once', () => {
    let step: Step = { description: "test", done: false };
    service.setStepDone(step);
    expect(step.done).toBeTrue;
  });

  it('should set the done property of a step to false when done was false and setStepDone was called twice', (done) => {
    let step: Step = { description: "test", done: false };
    service.setStepDone(step);
    service.setStepDone(step);
    expect(step.done).toBeFalse;
    done();
  });
});

不幸的是，在执行测试时它说：

StepService should be created
SPEC HAS NO EXPECTATIONS should set the done property of a step to true when done was false and setStepDone was called once
SPEC HAS NO EXPECTATIONS should set the done property of a step to false when done was false and setStepDone was called twice

所以“应该创建”似乎有效，但其他两个没有期望，虽然我期望 step.done 是真还是假。

为什么它不能识别 expect(...) 语句？

提前致谢

Answer 1

tobeTrue是一个函数，所以你需要加括号才能正确调用它（与toBeFalse相同）

expect(step.done).toBeTrue();

测试现在将找到可测试的期望值。

Angular10：服务单元测试"spec has no expectations"

Angular 10: Unit Test of service "spec has no expectations"

jasmine

typescript

karma-jasmine

angular