Pytest Discovery 'Hangs'

[ed-p-may]

Environment data

• Pylance version: 2024.12.1
• OS and version: MacOS Sequoia 15.1.1
• Python version (& distribution if applicable, e.g. Anaconda): 3.10.15

Code Snippet

NA

Repro Steps

• When pytest is run from terminal, all tests run as expected (success)
  

• With a small test module, when tests are added one at a time, Pylance discovery succeeds.
  

• BUT, if many test functions are added to a module at once, or several test-modules are added, discovery hangs and fails.
  

blue 'loading' bar just goes without end.

Note that there is no message of any kind in Terminal, Output, or Test Results. No error message, no information of any find. App restart is the only way to stop the failing discovery.

This behavior is the same in all projects opened in VSCode

Expected behavior

Tests are discovered

Actual behavior

Discovery fails (hangs and never resolves).

Logs

Attached. This is the log produced when I click on the Testing button in the Activity Bar
OUTPUT_PYTHON_TRACE.txt

2025-01-01 15:37:21.743 [info] Starting Pylance language server.
2025-01-01 15:37:21.745 [debug] Found cached env for /Users/em/Dropbox/bldgtyp-00/00_PH_Tools/honeybee_ph/.venv/bin/python
2025-01-01 15:37:21.746 [debug] Terminal shell path '/bin/zsh' identified as shell 'zsh'
2025-01-01 15:37:21.746 [debug] Shell identified as zsh 
2025-01-01 15:37:21.746 [debug] Found cached env for /Users/em/Dropbox/bldgtyp-00/00_PH_Tools/honeybee_ph/.venv/bin/python
2025-01-01 15:37:27.942 [debug] Found cached env for /Users/em/Dropbox/bldgtyp-00/00_PH_Tools/honeybee_ph/.venv/bin/python
2025-01-01 15:37:27.943 [debug] Found cached env for /Users/em/Dropbox/bldgtyp-00/00_PH_Tools/honeybee_ph/.venv/bin/python
2025-01-01 15:38:34.005 [debug] Found cached env for /Users/em/Dropbox/bldgtyp-00/00_PH_Tools/honeybee_ph/.venv/bin/python
2025-01-01 15:39:01.188 [debug] Found cached env for /Users/em/Dropbox/bldgtyp-00/00_PH_Tools/honeybee_ph/.venv/bin/python
2025-01-01 15:39:04.339 [debug] Found cached env for /Users/em/Dropbox/bldgtyp-00/00_PH_Tools/honeybee_ph/.venv/bin/python

Note the last line continues to update and adds another identical line every 30-40 seconds.

[paulomulotto]

Same problem here. I couldn't find any solution to it :/

[ceorcham]

This is python extension issue, you can make test discovery to work again by downgrading the VSCode python extension to 2024.22.0