VS Code test discovery not working with latest conda version 25.5.1 and pytest

[afriedma]

eleanorjboyd Hi there, I am also running a conda virtual env with version 2025.13.2025082601 Exactly same settings as described in the issue, but in my case, test discovery just hangs forever. Last thing I see in the OUTPUT window is

2025-08-29 05:45:30.392 [info] Discover tests for workspace name: scraping - uri: c:\Users\afriedman\scraping 2025-08-29 05:45:30.395 [warning] The cwd resolves to a different path, checking if it has a symbolic link somewhere in its path. 2025-08-29 05:45:30.398 [info] Environment variables set for pytest discovery: PYTHONPATH=c:\Users\afriedman.vscode\extensions\ms-python.python-2025.13.2025082601-win32-x64\python_files, TEST_RUN_PIPE=.\pipe\python-test-discovery-3d002100b8c820659318

@eleanorjboyd After further investigation, I don't think plugin detects the latest conda version 25.5.1 with pytest. With conda 22.9.0 the output is different as it finds the virtual env, please see below

2025-09-02 07:33:17.086 [info] Environment variables set for pytest discovery: PYTHONPATH=c:\Users\afriedman.vscode\extensions\ms-python.python-2025.12.0-win32-x64\python_files, TEST_RUN_PIPE=\.\pipe\python-test-discovery-ff4ae502f75a2cdf9ca1
2025-09-02 07:33:17.086 [debug] Running pytest discovery with command: -m pytest -p vscode_pytest --collect-only tests --rootdir=c:\Users\afriedman\Development\scraping for workspace c:\Users\afriedman\Development\scraping.
2025-09-02 07:33:17.087 [debug] Found executable within conda env {"name":"scraping_3.11.2","prefix":"C:\Users\afriedman\Miniconda3\envs\scraping_3.11.2"}
2025-09-02 07:33:17.092 [debug] Executable path for pytest discovery: C:\Users\afriedman\Miniconda3\envs\scraping_3.11.2\python.exe.

Originally posted by @afriedma in #508

[eleanorjboyd]

Hi! Thanks for the issue and sorry for the delay. Are you able to run and debug the test file successfully? The place where you experience the hang is right as the subprocess is started up so we don't have a ton of visitability into what is happening if there are no exit codes. Also running your tests from the command like like python -m pytest --collect-only works?

[afriedma]

Its, no problem. I appreciate you looking at it. Here are my tests

Here is the test discovery window, its just spinning forever

I can run tests from the console

I can also debug the tests with the launch.json

[afriedma]

@eleanorjboyd with most recent pluging I see the error message below

2025-09-15 07:37:14.310 [error] pytest test discovery error for workspace: c:\Users\afriedman\AppData\Local\Development\scraping

The python test process was terminated before it could exit on its own, the process errored with: Code: null, Signal: null for workspace

[eleanorjboyd]

Hi! Made a fix here that is out on the pre-release version of the python environments extension. Can you try that and let me know if it works?

[afriedma]

The fix worked, thank you so much.