由 AWS SDK 导致的环境被破坏后尝试导入的笑话

Posted 2023-03-24

【中文标题】由 AWS SDK 导致的环境被破坏后尝试导入的笑话

【英文标题】：Jest trying to import after environment torn down, caused by AWS SDK

【发布时间】：2021-10-02 03:55:57

【问题描述】：

我的应用程序的 Jest 集成测试在本地 DynamoDB 中创建记录，所有测试都顺利通过，但在之后的清理中，我收到一条消息说

ReferenceError: You are trying to `import` a file after the Jest environment has been torn down.

      at Object.userAgent (node_modules/aws-sdk/lib/util.js:34:43)
      at HttpRequest.setUserAgent (node_modules/aws-sdk/lib/http.js:111:78)
      at new HttpRequest (node_modules/aws-sdk/lib/http.js:104:10)
      at new Request (node_modules/aws-sdk/lib/request.js:328:24)
      at features.constructor.makeRequest (node_modules/aws-sdk/lib/service.js:202:19)
npm ERR! Test failed.  See above for more details.

我有一个 afterAll 设置在每次测试后运行并删除创建的记录，如下所示：

afterAll(async () => 
    ECs.forEach(async (EC) => 
        await deleteUser(EC);
    )
    ECs = []; 
)

我尝试使用假计时器但没有成功。这些测试也都是按顺序运行的。这是其中一项测试的示例：

test("Create new user", async () => 
    const johnECInitialRequestParams = 
        EC: 
            firstName: "John",
            email: "[e-mail]",
        ,
        responsibleFor: "8b8a9eb9-840f-4245-9200-719fe05f6612"
    

    const johnECResultStoredObject = 
        ECID: "f576d1cb-4df0-4093-9b2d-b94c70a28e18",
        firstName: "John",
        email: "[e-mail]",
        responsibilities: [
            
                greenID: "8b8a9eb9-840f-4245-9200-719fe05f6612",
                RID: "8e76e90c-8088-40d3-add3-e39c1d4024d8",
                status: "pending"
            
        ]
    

    uuidv4
    .mockReturnValue(null)  // should only be called twice
    .mockReturnValueOnce(johnECResultStoredObject.ECID)  // for ECID
    .mockReturnValueOnce(johnECResultStoredObject.responsibilities[0].RID)  // for RID

    ECs.push(johnECResultStoredObject.ECID);  // to delete the object after the test execution

    try 
        await handler(johnECInitialRequestParams, undefined, undefined);
    
    catch (err) 
        console.error(err);
        throw err
    
    expect(await getUser(johnECResultStoredObject.ECID)).toMatchObject(johnECResultStoredObject);
);

【参考方案1】：

导入后，在您的测试文件中添加 jest.useFakeTimers()