无法监视第二个和第三个电话笑话

Question

我无法在使用 jest 的测试中对函数的第二次和第三次调用进行间谍操作

我尝试按照文档这样做：

it("should succeed after retry on first attempt failure", async () => {
  jest.spyOn(nukiService, "lockDoors")
    .mockResolvedValueOnce(Promise.resolve({ status: 503 }))
    .mockResolvedValueOnce(Promise.resolve({ status: 200 }));

  expect((await nukiService.lockDoorsWithRetry()).status)
    .toBe(200);
});
    
it("should fail after 3 retries", async () => {
  jest.spyOn(nukiService, "lockDoors")
    .mockResolvedValueOnce(Promise.resolve({ status: 503 }))
    .mockResolvedValueOnce(Promise.resolve({ status: 503 }))
    .mockResolvedValueOnce(Promise.resolve({ status: 503 }));
    
  expect((await nukiService.lockDoorsWithRetry()).status)
    .toBe(424);
});

我的测试由于超时而失败，所以我认为问题来自间谍On，它不起作用：

● NukiService › handle doors › should succeed after retry on first attempt failure

    thrown: "Exceeded timeout of 5000 ms for a test.
    Add a timeout value to this test to increase the timeout, if this is a long-running test. See https://jestjs.io/docs/api#testname-fn-timeout."

      85 |     });
      86 |
    > 87 |     it("should succeed after retry on first attempt failure", async () => {
         |     ^
      88 |       jest.spyOn(nukiService, "lockDoors")
      89 |         .mockResolvedValueOnce(Promise.resolve({ status: 503 }))
      90 |         .mockResolvedValueOnce(Promise.resolve({ status: 200 }));

      at services/nuki.service.spec.ts:87:5
      at services/nuki.service.spec.ts:18:3
      at Object.<anonymous> (services/nuki.service.spec.ts:5:1)

Answer 1

测试抛出超时。它表示

nukiService.lockDoorsWithRetry()

所花费的时间比为测试超时设置的值要长。

尝试在

nukiService.lockDoorsWithRetry()

内部进行调试，看看内部代码的行为是什么以及是否是您所期望的。