pytest discovery never ends

[Imanuel-Miz]

Type: Bug

Behaviour

When I click on the the "test explorer" UI icon, in order to trigger discovery of python tests in my projects (I am using a multi-root workspace), it shows like it starting, but never ends.
No clear errors in the python / extension host logs.
Tried setting the logs for trace / debug, but did not find any error, or anything useful.

If I set:
"python.experiments.optOutFrom": ["pythonTestAdapter"]

The test discovery works, but the discovery fails over other issues, which normally never failed for me.

If I do not click on the "test explorer" icon, but simple save a python test file, the discovery for the project works, as I can see the green arrow for run / debug tests for the tests files in the project.

It started a few days ago, so I suspect this is related to one of the latest updated of the python extension.

Steps to reproduce:

1. Click on the "test explorer" UI icon.
2. pytest discovery never ends

Diagnostic data

Output for Python in the Output panel (View→Output, change the drop-down the upper-right of the Output panel to Python)

XXX

Extension version: 2024.22.0
VS Code version: Code 1.96.0 (138f619c86f1199955d53b4166bef66ef252935c, 2024-12-11T02:29:09.626Z)
OS version: Darwin arm64 24.2.0
Modes:

• Python version (& distribution if applicable, e.g. Anaconda): 3.10.11
• Type of virtual environment used (e.g. conda, venv, virtualenv, etc.): Venv
• Value of the python.languageServer setting: Pylance

User Settings

Multiroot scenario, following user settings may not apply:

envFile: "<placeholder>"

languageServer: "Pylance"

testing
• pytestArgs: "<placeholder>"
• pytestEnabled: true
• unittestArgs: "<placeholder>"

Installed Extensions

Extension Name	Extension Id	Version
autopep8	ms-python.autopep8	2024.0.0
Code Spell Checker	streetsidesoftware.code-spell-checker	4.0.21
Codeium: AI Coding Autocomplete and Chat for Python, Javascript, Typescript, Java, Go, and more	Codeium.codeium	1.30.2
Copy File Name	ouweiya.copy-file-name	3.0.9
custom-button	OhYee.custom-button	1.0.0
Django	batisteo.vscode-django	1.15.0
Draw.io Integration	hediet.vscode-drawio	1.6.6
ESLint	dbaeumer.vscode-eslint	3.0.10
Flow / Jira Commit Prefix	emilianox.flow-jira-commit-prefix	0.0.9
Git Blame	waderyan.gitblame	11.1.1
Git History	donjayamanne.githistory	0.6.20
GitHub Actions	github.vscode-github-actions	0.27.0
GitHub Pull Requests	GitHub.vscode-pull-request-github	0.102.0
GitLens — Git supercharged	eamodio.gitlens	16.0.5
HashiCorp Terraform	hashicorp.terraform	2.34.1
IntelliCode	VisualStudioExptTeam.vscodeintellicode	1.3.2
IntelliCode API Usage Examples	VisualStudioExptTeam.intellicode-api-usage-examples	0.2.9
isort	ms-python.isort	2023.10.1
JavaScript and TypeScript Nightly	ms-vscode.vscode-typescript-next	5.8.20241216
JavaScript Debugger	ms-vscode.js-debug	1.96.0
JavaScript Debugger Companion Extension	ms-vscode.js-debug-companion	1.1.3
Jupyter	ms-toolsai.jupyter	2024.11.0
Jupyter Cell Tags	ms-toolsai.vscode-jupyter-cell-tags	0.1.9
Jupyter Keymap	ms-toolsai.jupyter-keymap	1.1.2
Jupyter Notebook Renderers	ms-toolsai.jupyter-renderers	1.0.21
Jupyter Slide Show	ms-toolsai.vscode-jupyter-slideshow	0.1.6
Markdown All in One	yzhang.markdown-all-in-one	3.6.2
Open full realpath	ima-miz-vscode.open-full-realpath	0.1.1
Open In Default Browser	peakchen90.open-html-in-browser	2.1.10
Path Intellisense	christian-kohler.path-intellisense	2.10.0
Peacock	johnpapa.vscode-peacock	4.2.2
Postman	Postman.postman-for-vscode	1.5.1
Prettier SQL VSCode	inferrinizzard.prettier-sql-vscode	1.6.0
Pylance	ms-python.vscode-pylance	2024.12.1
Pytest IntelliSense	Cameron.vscode-pytest	0.1.1
Python	ms-python.python	2024.22.0
Python Debugger	ms-python.debugpy	2024.14.0
Python Extension Pack	donjayamanne.python-extension-pack	1.7.0
Python Indent	KevinRose.vsc-python-indent	1.18.0
Spell Right	ban.spellright	3.0.140
Table Visualizer for JavaScript Profiles	ms-vscode.vscode-js-profile-table	1.0.10
Terraform Advanced Syntax Highlighting	pjmiravalle.terraform-advanced-syntax-highlighting	1.4.3
Terraform Completer	mgtrrz.terraform-completer	0.2.0
Test Adapter Converter	ms-vscode.test-adapter-converter	0.2.1
Test Explorer UI	hbenl.vscode-test-explorer	2.22.1
undefined	oderwat.indent-rainbow	8.3.1
vscode-icons	vscode-icons-team.vscode-icons	12.10.0
YAML	redhat.vscode-yaml	1.15.0

System Info

Item	Value
CPUs	Apple M1 Pro (8 x 2400)
GPU Status	2d_canvas: enabled canvas_oop_rasterization: enabled_on direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok skia_graphite: disabled_off video_decode: enabled video_encode: enabled webgl: enabled webgl2: enabled webgpu: enabled webnn: disabled_off
Load (avg)	3, 4, 5
Memory (System)	32.00GB (0.28GB free)
Process Argv	--crash-reporter-id cf2645eb-101b-464d-b242-c8081c97eeb2
Screen Reader	no
VM	0%

A/B Experiments

vsliv368cf:30146710
vspor879:30202332
vspor708:30202333
vspor363:30204092
vswsl492:30256859
pythonvspyt551cf:31179979
vscod805:30301674
binariesv615:30325510
vsaa593:30376534
py29gd2263:31024239
c4g48928:30535728
azure-dev_surveyone:30548225
962ge761:30959799
pythonnoceb:30805159
pythonmypyd1:30879173
2e7ec940:31000449
pythontbext0:30879054
cppperfnew:31000557
dsvsc020:30976470
pythonait:31006305
dsvsc021:30996838
dvdeprecation:31068756
dwnewjupyter:31046869
nativerepl1:31139838
pythonrstrctxt:31112756
nativeloc2:31192216
cf971741:31144450
iacca1:31171482
notype1cf:31157160
5fd0e150:31155592
dwcopilot:31170013
stablechunks:31184530
6074i472:31201624

[Imanuel-Miz]

Just for test, I downgraded to 2024.20.0 version, and can see the discovery working.
So, it seems to be an issue with the version: 2024.22.0

[eleanorjboyd]

duplicate of: #24613. Should be resolved on the newest version of vscode-python insiders!

[Imanuel-Miz]

Thank you @eleanorjboyd , for your fast response on this bug.
I switched to the pre-release version, and indeed the discovery started to kick in.

However, it seems like it is not completely solved, as now my discovery only "half" working.

The discovery starts to some of my folders, it does not show that it stopped, and I cannot see the names of the folders in the test explorer:

I am using multi-workspace configuration, and normally, I would see all the repositories in my folders, as a list in the test explorer as well:

I didn't see any special log in the python extension / extension host logs.

Would appreciate your assistance on the matter.
thank you!

[eleanorjboyd]

Hi! Sorry for the delay- #24656 should have more info and be up to date- thanks

[Imanuel-Miz]

Hi @eleanorjboyd , hope you enjoyed your vacation during the holidays!
Indeed, I noticed that the main ticket: #24656
Confirmed it is solved for me as well, in the pre-release version.

Appreciate your help, and thank you for maintaining and improving the python test feature!!

[hhalaby]

Anyone landing here from google, there's seems to be a new issue with systemd services failing and causing this error again. Here's the solution on StackOverFlow