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Strengthen regression coverage for pytest + multiprocessing child-process debug sessions with integration repro tests by Copilot · Pull Request #1032 · microsoft/vscode-python-debugger · GitHub

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Strengthen regression coverage for pytest + multiprocessing child-process debug sessions with integration repro tests - #1032

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Rich Chiodo (rchiodo) with Copilot wants to merge 12 commits into
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Strengthen regression coverage for pytest + multiprocessing child-process debug sessions with integration repro tests#1032
Rich Chiodo (rchiodo) with Copilot wants to merge 12 commits into
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copilot/debug-pytest-child-process-issue

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Copilot AI commented May 11, 2026 •
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Debugging pytest tests that involve subprocesses could exit the debug session when a child process terminated, because child attach sessions could be treated as test sessions. This PR now includes both unit and integration regression coverage, including the follow-up process-pool scenario reported on the issue.

  • What changed

    • Extended childProcessAttachService unit coverage to validate child attach config behavior for pytest-style launches.
    • Added assertions that child attach sessions:
      • strip purpose (to avoid debug-test misclassification on subprocess sessions),
      • preserve pytest launch fields unchanged (module, args, console).
    • Added an end-to-end debugger integration test that launches pytest with purpose: ["debug-test"] and subProcess: true, executes a ProcessPoolExecutor-based test, and verifies execution reaches code after worker completion.
    • Added a small test-harness helper to start debugger sessions from an explicit debug configuration for this integration path.

  • Why this matters

    • Captures the failure mode where subprocess termination can incorrectly end test debugging.
    • Extends coverage from config-shape unit validation to full debug-session behavior for pytest + subprocess scenarios.
    • Protects both the original multiprocessing.Process(...).join() path and the newer process-pool reproduction shape from regression.

  • Regression examples covered

const data: AttachRequestArguments = {
  request: 'attach',
  type: debuggerTypeName,
  name: 'Attach',
  port: 1234,
  subProcessId: 2,
  purpose: ['debug-test'],
  module: 'pytest',
  args: ['-s', '/workspace/tests/test_multiproc.py'],
  console: 'integratedTerminal',
};

// Assert: purpose removed, module/args/console preserved.
const config = {
  type: 'python',
  request: 'launch',
  module: 'pytest',
  purpose: ['debug-test'],
  subProcess: true,
  args: ['-s', processPoolTestFile, '-k', 'test_library_process_pool'],
  env: { DEBUG_DONE_FILE: processPoolDoneFile },
};

// Assert: debug session exits cleanly and completion marker is written
// after process-pool workers complete.

> [!WARNING]
>
>

Copilot AI linked an issue May 11, 2026 that may be closed by this pull request
Debugging pytest tests causes premature exit upon process.join() #981
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Copilot AI changed the title [WIP] Fix premature exit during debugging of pytest tests with multiprocessing Strengthen regression coverage for pytest + multiprocessing child-process debug sessions May 11, 2026
Copilot AI requested a review from Rich Chiodo (rchiodo) May 11, 2026 19:53

Rich Chiodo (rchiodo) commented May 11, 2026

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Copilot did you reproduce the error with this test? It looks like you're just making sure the most recent fix didn't regress anything else, but I don't see any other code fixes.

Copilot AI commented May 11, 2026

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Copilot did you reproduce the error with this test? It looks like you're just making sure the most recent fix didn't regress anything else, but I don't see any other code fixes.

You’re right. I did not reproduce the full Test Explorer failure path in this sandbox; I only added unit regression coverage around the existing production behavior (delete debugConfig.purpose) in child-process attach. So this PR does not include a new runtime code fix beyond that existing path. Latest commit: 0c86597. If you want, I can follow up by adding an integration-style repro test that exercises the pytest launch path end-to-end.

Rich Chiodo (rchiodo) commented May 11, 2026

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Copilot yes please add a full integration test and see if you can reproduce the problem as stated by the last comment on the issue.

Copilot AI and others added 8 commits May 11, 2026 20:07
test: add debugger integration coverage for pytest processpool child …
a56867a 
…sessions

Agent-Logs-Url: https://github.com/microsoft/vscode-python-debugger/sessions/573cd841-8f08-4cd0-8021-229e2380164f

Co-authored-by: rchiodo <19672699+rchiodo@users.noreply.github.com>
test: polish new pytest processpool integration fixture naming
95daf58 
Agent-Logs-Url: https://github.com/microsoft/vscode-python-debugger/sessions/573cd841-8f08-4cd0-8021-229e2380164f

Co-authored-by: rchiodo <19672699+rchiodo@users.noreply.github.com>
test: stabilize pytest processpool integration scenario
329c3a1 
Agent-Logs-Url: https://github.com/microsoft/vscode-python-debugger/sessions/573cd841-8f08-4cd0-8021-229e2380164f

Co-authored-by: rchiodo <19672699+rchiodo@users.noreply.github.com>
test: clarify processpool futures handling and timeout constant
df76a87 
Agent-Logs-Url: https://github.com/microsoft/vscode-python-debugger/sessions/573cd841-8f08-4cd0-8021-229e2380164f

Co-authored-by: rchiodo <19672699+rchiodo@users.noreply.github.com>
test: rename processpool helper for clarity
9772c75 
Agent-Logs-Url: https://github.com/microsoft/vscode-python-debugger/sessions/573cd841-8f08-4cd0-8021-229e2380164f

Co-authored-by: rchiodo <19672699+rchiodo@users.noreply.github.com>
test: align process-pool integration test naming
732717b 
Agent-Logs-Url: https://github.com/microsoft/vscode-python-debugger/sessions/573cd841-8f08-4cd0-8021-229e2380164f

Co-authored-by: rchiodo <19672699+rchiodo@users.noreply.github.com>
test: rename process-pool worker helper for clarity
88cae85 
Agent-Logs-Url: https://github.com/microsoft/vscode-python-debugger/sessions/573cd841-8f08-4cd0-8021-229e2380164f

Co-authored-by: rchiodo <19672699+rchiodo@users.noreply.github.com>
test: fix process-pool helper indentation and pending futures naming
ccdf8a1 
Agent-Logs-Url: https://github.com/microsoft/vscode-python-debugger/sessions/573cd841-8f08-4cd0-8021-229e2380164f

Co-authored-by: rchiodo <19672699+rchiodo@users.noreply.github.com>

Copilot AI commented May 11, 2026 •
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Copilot yes please add a full integration test and see if you can reproduce the problem as stated by the last comment on the issue.

Added a full debugger integration test that launches pytest with purpose: ['debug-test'] + subProcess: true and exercises a ProcessPoolExecutor scenario from the latest issue comment path. It verifies the test reaches post-pool code by asserting a completion marker file is written. I also added a small test-harness helper to start sessions from explicit debug configs. Commit: ccdf8a1.

I attempted to run the targeted integration test here, but this sandbox cannot complete npm test (fails at VS Code download: Resolving version...) and local python -m pytest is unavailable (No module named pytest).

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

  • update.code.visualstudio.com
    • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node node ./out/test/runTest.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

Copilot AI changed the title Strengthen regression coverage for pytest + multiprocessing child-process debug sessions Strengthen regression coverage for pytest + multiprocessing child-process debug sessions with integration repro tests May 11, 2026

Rich Chiodo (rchiodo) commented May 11, 2026

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Copilot can you create a virtual env in the sandbox? I don't personally have time to reproduce this problem so it would be nice if you could investigate how to run the test in your sandbox.

Copilot AI commented May 11, 2026 •
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Copilot can you create a virtual env in the sandbox? I don't personally have time to reproduce this problem so it would be nice if you could investigate how to run the test in your sandbox.

I investigated this in the sandbox using a fresh virtual env and can now run the pytest repro directly.

What works in sandbox:

  • python3 -m venv /tmp/vscode-python-debugger-venv
  • /tmp/vscode-python-debugger-venv/bin/python -m pip install pytest
  • DEBUG_DONE_FILE=/tmp/pytest-processpool-debug-done.txt /tmp/vscode-python-debugger-venv/bin/python -m pytest -s /home/runner/work/vscode-python-debugger/vscode-python-debugger/src/test/pythonFiles/debugging/test_pytest_processpool.py -k test_library_process_pool
  • Result: 1 passed, and marker file was written (done).

What is still blocked:

  • Running the VS Code integration harness (npm test with TEST_GREP) still fails before execution in this sandbox.
  • Root cause: @vscode/test-electron cannot resolve update.code.visualstudio.com (getaddrinfo ENOTFOUND) while trying to download VS Code.

Current branch head: ccdf8a1 (no repo file changes for this investigation).

No UI changes in this update (screenshot N/A).

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

  • update.code.visualstudio.com
    • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node node ./out/test/runTest.js (dns block)
    • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node node - (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

Rich Chiodo (rchiodo) commented May 11, 2026

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Copilot is there a way to change the firewall rules?

Copilot AI commented May 11, 2026

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Copilot is there a way to change the firewall rules?

Not from inside this sandbox. I can’t change outbound firewall/DNS policy here, so I can’t unblock update.code.visualstudio.com myself.

If that host can be allowlisted in the runner/network policy, the integration harness should run. Otherwise, the practical workaround is to run the integration test in an environment with normal outbound access (or with VS Code already cached/preinstalled).

No code changes in this step (head still ccdf8a1). No UI changes (screenshot N/A).

Rich Chiodo (rchiodo) added the bug Issue identified by VS Code Team member as probable bug label May 12, 2026
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Debugging pytest tests causes premature exit upon process.join()

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