React Jest：-节点：内部/进程/承诺：246 triggerUncaughtException（err，true / * fromPromise */）；

Question

我有以下代码在反应。

useEffect(() => {
        (async () => {
            await httpClient
                .get(`${config.resourceServerUrl}/inventory/`)
                .then((response) => {
                    setSponsor(response.data.sponsor);
                    setAddress(response.data.address);
                    setPhaseOfTrial(response.data.phaseOfTrial);
                })
                .catch((error) => {
                    alert(error);
                });
        })();
    }, []);

此代码运行成功。唯一的问题是，它在玩笑测试用例中失败了。

describe('ListInventory', () => {
    it('should render successfully', () => {
        const { baseElement } = render(<ListInventory />);
        expect(baseElement).toBeTruthy();
    });
});

以下是错误。

node:internal/process/promises:246
          triggerUncaughtException(err, true /* fromPromise */);
          ^

[UnhandledPromiseRejection: This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). The promise rejected with the reason "TypeError: Cannot read properties of undefined (reading 'get')".] {
  code: 'ERR_UNHANDLED_REJECTION'
}

我已经在使用

catch

块。代码有什么问题？你能帮我做同样的事情吗？

Answer 1

尝试使用 try-catch 块处理 Promise，如下所示：

  useEffect(() => {
    (async () => {
      try {
        let response = await httpClient.get(
          `${config.resourceServerUrl}/inventory/`
        );
        setSponsor(response.data.sponsor);
        setAddress(response.data.address);
        setPhaseOfTrial(response.data.phaseOfTrial);
      } catch(error) {
        alert(error);
      }
    })();
  }, []);

或

  useEffect(() => {
    (async () => {
        let response = await httpClient.get(
          `${config.resourceServerUrl}/inventory/`
        );
        setSponsor(response.data.sponsor);
        setAddress(response.data.address);
        setPhaseOfTrial(response.data.phaseOfTrial);
    })().catch(e=>alert(e));
  }, []);

Answer 2

您应该使测试异步，因为您的代码中有异步调用：

describe('ListInventory', () => {
    it('should render successfully', async() => {
        const { baseElement } = render(<ListInventory />);
        expect(baseElement).toBeTruthy();
    });
});

Answer 3

我遇到了类似的问题。

此问题可能是由于 response.data 旁边的对象之一未定义造成的。 添加条件来检查其存在。

这解决了我的问题

Answer 4

执行此操作的最佳方法如下：

    useEffect(() => {
        (async () => {
            let response = async () => await httpClient.get(
                `${config.resourceServerUrl}/inventory/`
            );

            response
                .then((res) => {
                    setSponsor(res.data.sponsor);
                    setAddress(res.data.address);
                    setPhaseOfTrial(res.data.phaseOfTrial);
                }).catch((error) => {
                    alert(error);
                })
        })();
    }, []);