toHaveBeenCalled() 在模拟输出显示正确数据时失败

Question

我已经厌倦了尝试弄清楚以下内容。基本上我的组件中有一个方法调用一个被模拟的服务。一旦该服务完成，另一个服务就会执行一些日志记录活动，这也是模拟的。但是我的测试失败了，说日志服务没有被调用：

       process(){
       const that : any = this;
      this.mainService.process().then(result=>{

       return result;

    }).then(result=>{
      //log the operation now after doing some checkups
      let checkups = ""
      that.logService.log('process',result, checkups).then(logged=>{
        console.log(logged)

      }).catch(err=>console.log(err)
    }).catch(err=>console.log(err);

    }

在我们继续之前，由于执行检查的逻辑，Promise.all() 与选项不匹配。现在到测试位：

fit("should log processed request", done => {
  const mainSerivce = TestBed.get(MainService)
  const logService = TestBed.get(LogService)
  spyOn(mainService, "process").and.returnValue(Promise.resolve({id:34,value:64, rank:310));
  const logSpy = spyOn(logSerivce, "log").and.returnValue(Promise.resolve({'done':true}))


  fixture.whenStable().then(finished=>{

    component.process();

    expect(logSpy).toHaveBeenCalled();
    done();

  })

});


expect(logSpy).toHaveBeenCalled();

现在失败了，但我可以在我的控制台中看到模拟 {'done':true} 的结果或显示我传递的任何值，这意味着它被模拟并调用了 (?)。我到底错过了什么，因为这些方法似乎已被模拟并正确记录在控制台中。

Answer 1

在我看来你必须等待 promise 解决后再断言，试试：

fit("should log processed request", done => {
  const mainSerivce = TestBed.get(MainService)
  const logService = TestBed.get(LogService)
  spyOn(mainService, "process").and.returnValue(Promise.resolve({id:34,value:64, rank:310));
  const logSpy = spyOn(logSerivce, "log").and.returnValue(Promise.resolve({'done':true}));
  // call the function that will resolve promises
  component.process();
  // whenStable waits for the promises to resolve.
  fixture.whenStable().then(finished=>{
    console.log('Making the assertion !!');
    expect(logSpy).toHaveBeenCalled();
    done();
  });
});

确保您在 Making the assertion !! 的日志之前看到 { 'done': true } 的日志。但是由于您在承诺中解决了承诺，因此以下内容可能会解决它。

fit("should log processed request", async done => { // check out the async keyword here
  const mainSerivce = TestBed.get(MainService)
  const logService = TestBed.get(LogService)
  spyOn(mainService, "process").and.returnValue(Promise.resolve({id:34,value:64, rank:310));
  const logSpy = spyOn(logSerivce, "log").and.returnValue(Promise.resolve({'done':true}));
  // call the function that will resolve promises
  component.process();
  // when stable waits for the promises to resolve.
  await fixture.whenStable();
  await fixture.whenStable();
  expect(logSpy).toHaveBeenCalled();
  done();
});

toHaveBeenCalled() 在模拟输出显示正确数据时失败

toHaveBeenCalled() failing when mocked output shows correct data

unit-testing

jasmine