--detectOpenHandles does not detect handles opened in test function with `done` callback

[Mr0grog]

🐛 Bug Report

The --detectOpenHandles option fails to detect/warn about handles that were opened in test functions with a done callback. (It seems to work fine for promise-returning or async test functions.) I noticed this while looking into issues with Supertest in #8554 (comment)

To Reproduce

Given the following test file:

const http = require("http");

describe("detectOpenHandles", () => {
  it("should detect an open server when using a `done` function", (done) => {
    const server = http.createServer((_request, response) => response.end("ok"));
    server.listen(0, () => done());
  });
});

Running Jest with --detectOpenHandles hangs, but does not print any information about the open TCPSERVERWRAP handle:

$ jest --detectOpenHandles open-handles.test.js
 PASS  ./open-handles.test.js
  detectOpenHandles
    ✓ should detect an open server when using a `done` function (7 ms)

Test Suites: 1 passed, 1 total
Tests:       1 passed, 1 total
Snapshots:   0 total
Time:        1.297 s
Ran all test suites matching /open-handles.test.js/i

Expected Behavior

In contrast, using an async function or returning a promise works as expected. Given the following test file:

const http = require("http");

describe("detectOpenHandles", () => {
  it("should detect an open server when using a promise", () => {
    const server = http.createServer((_request, response) => response.end("ok"));
    return new Promise(resolve => server.listen(0, resolve));
  });
});

Running it successfully detects and prints information about the open server:

$ jest --detectOpenHandles open-handles.test.js
 PASS  ./open-handles.test.js
  detectOpenHandles
    ✓ should detect an open server when using a promise (6 ms)

Test Suites: 1 passed, 1 total
Tests:       1 passed, 1 total
Snapshots:   0 total
Time:        1.956 s
Ran all test suites matching /open-handles.test.js/i.

Jest has detected the following 1 open handle potentially keeping Jest from exiting:

  ●  TCPSERVERWRAP

      89 |   it("should detect an open server when using a promise", () => {
      90 |     const server = http.createServer((_request, response) => response.end("ok"));
    > 91 |     return new Promise(resolve => server.listen(0, resolve));
         |                                          ^
      92 |   });
      93 | });

      at open-handles.test.js:91:42
      at Object.<anonymous> (open-handles.test.js:91:12)

Cause

It looks like the issue is in how Jest decides which handles to track. In jest-core/src/collectHandles.ts, handles are only tracked if stackIsFromUser() returns true. It checks for the names of wrappers that run the test functions: https://github.com/facebook/jest/blob/ba84480a5603aeeb94184ffc26f9b39024cdcd6c/packages/jest-core/src/collectHandles.ts#L18-L38

That works great for functions that don’t take a done callback. They get wrapped with a function named asyncJestTest, which stackIsFromUser() looks for: https://github.com/facebook/jest/blob/ba84480a5603aeeb94184ffc26f9b39024cdcd6c/packages/jest-jasmine2/src/jasmineAsyncInstall.ts#L123-L153

But functions that take a done callback don’t get wrapped at all, and are anonymous or have no name that stackIsFromUser() knows to look for: https://github.com/facebook/jest/blob/ba84480a5603aeeb94184ffc26f9b39024cdcd6c/packages/jest-jasmine2/src/jasmineAsyncInstall.ts#L111-L113

It looks like lifecycle functions will experience the same issue (although I haven’t tested), given the similar code in promisifyLifeCycleFunction().

The simplest fix here might be to simply wrap functions that take a done callback with a function, too (e.g. asyncJestTestWithCallback) and add that to the list of things to watch for in stackIsFromUser().

envinfo

  System:
    OS: macOS 10.15.7
    CPU: (4) x64 Intel(R) Core(TM) i7-5557U CPU @ 3.10GHz
  Binaries:
    Node: 16.1.0 - ~/.nvm/versions/node/v16.1.0/bin/node
    Yarn: 1.22.10 - /usr/local/bin/yarn
    npm: 7.11.2 - ~/.nvm/versions/node/v16.1.0/bin/npm
  npmPackages:
    jest: ^26.6.3 => 26.6.3

[Mr0grog]

Note: this only happens with the Jasmine test runner; Circus [which I just learned about!] does not seem to exhibit the issue.

[github-actions]

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