Test Explorer and GitHub Explorer Stuck in Discovery Mode

[graysddoman]

Type: Bug

Since installing the latest update (1.96), both the Test Explorer and GitHub Explorer are stuck in discovery mode and do not complete. Also, not sure if it's related, but the Dev Container I've been running for months has completely died.

VS Code version: Code 1.96.0 (138f619, 2024-12-11T02:29:09.626Z)
OS version: Windows_NT x64 10.0.22635
Modes:
Remote OS version: Linux x64 5.15.167.4-microsoft-standard-WSL2

System Info

Item	Value
CPUs	12th Gen Intel(R) Core(TM) i7-12800H (20 x 2803)
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 vulkan: disabled_off webgl: enabled webgl2: enabled webgpu: enabled webnn: disabled_off
Load (avg)	undefined
Memory (System)	31.68GB (2.24GB free)
Process Argv	--file-uri vscode-remote://dev-container%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-iiot-unplanned-stops/fhc-iiot-unplanned-stops.code-workspace --crash-reporter-id 430bbfd2-0ca3-4bbf-a41a-457266e8a089
Screen Reader	no
VM	0%

Item	Value
Remote	Dev Container: Ubuntu @ desktop-linux
OS	Linux x64 5.15.167.4-microsoft-standard-WSL2
CPUs	12th Gen Intel(R) Core(TM) i7-12800H (20 x 0)
Memory (System)	15.46GB (11.59GB free)
VM	0%

Extensions (38)

Extension	Author (truncated)	Version
terraform	4op	0.2.5
codespaces	Git	1.17.3
remotehub	Git	0.64.0
vscode-drawio	hed	1.6.6
vscode-azurevirtualmachines	ms-	0.6.6
jupyter-keymap	ms-	1.1.2
vscode-ai-remote	ms-	1.2.0
remote-containers	ms-	0.394.0
remote-ssh	ms-	0.116.1
remote-ssh-edit	ms-	0.87.0
remote-wsl	ms-	0.88.5
vscode-remote-extensionpack	ms-	0.26.0
azure-repos	ms-	0.40.0
remote-explorer	ms-	0.4.3
remote-repositories	ms-	0.42.0
remote-server	ms-	1.5.2
rewrap	stk	1.16.3
vscode-tailwindcss	bra	0.12.16
ruff	cha	2024.56.0
vscode-markdownlint	Dav	0.57.0
vscode-eslint	dba	3.0.10
prettier-vscode	esb	11.0.0
copilot	Git	1.252.0
copilot-chat	Git	0.24.2024121201
vscode-pull-request-github	Git	0.102.0
vscode-drawio	hed	1.6.6
rest-client	hum	0.25.1
dotenv	mik	1.0.1
vscode-dapr	ms-	0.8.0
vscode-docker	ms-	1.29.3
vscode-kubernetes-tools	ms-	1.3.18
playwright	ms-	1.1.12
debugpy	ms-	2024.14.0
python	ms-	2024.22.0
vscode-pylance	ms-	2024.12.1
vscode-yaml	red	1.15.0
sonarlint-vscode	Son	4.13.2
code-spell-checker	str	4.0.21

A/B Experiments

vsliv368cf:30146710
vspor879:30202332
vspor708:30202333
vspor363:30204092
vscod805:30301674
binariesv615:30325510
vsaa593cf:30376535
py29gd2263:31024239
c4g48928:30535728
azure-dev_surveyone:30548225
vscrpc:30673769
962ge761:30959799
pythonnoceb:30805159
pythonmypyd1:30879173
2e7ec940:31000449
pythontbext0:30879054
cppperfnew:31000557
dsvsc020:30976470
pythonait:31006305
dsvsc021:30996838
dvdeprecation:31068756
dwnewjupyter:31046869
newcmakeconfigv2:31071590
nativerepl2:31139839
pythonrstrctxt:31112756
nativeloc2:31192216
cf971741:31144450
iacca1:31171482
notype1:31157159
5fd0e150:31155592
dwcopilot:31170013
stablechunks:31184530
6074i472:31201624

[chrmarti]

Do the Test Explorer and GitHub Explorer work locally and in WSL?

[sharmuz]

I'm experiencing the same issue. VS Code is stuck discovering tests - never completes, with an error or otherwise.

Running pytest directly through the integrated terminal works fine. All tests collected and executed as expected.

VS Code version: 1.96.0
OS version: macOS Sequoia 15.1.1

EDIT: I'm not working in a dev container.

[jcorioland]

Do the Test Explorer and GitHub Explorer work locally and in WSL?

@chrmarti I am experiencing the same issue than @graysddoman and I can confirm that the problem seems to happen in devcontainer, but not in WSL. Also running VSCode 1.96.

[graysddoman]

Do the Test Explorer and GitHub Explorer work locally and in WSL?

They appear to work locally and in WSL.

The issue appears when I try to work with a Dev Container. The Dev Container worked perfectly fine for months, however this has become unstable since installing the update. I'm using WSL with Ubuntu 24.04. Others in the team are experiencing the same issue as well.

[jcorioland]

This is the output from python console:

2024-12-18 09:49:51.718 [info] Discover tests for workspace name: all - uri: /workspaces/project-name
2024-12-18 09:49:51.719 [info] Running discovery for pytest using the new test adapter.
2024-12-18 09:49:51.719 [info] Discover tests for workspace name: project1 - uri: /workspaces/project-name/src/project1
2024-12-18 09:49:51.719 [info] Discover tests for workspace name: project1_api - uri: /workspaces/project-name/src/project1_api
2024-12-18 09:49:51.719 [info] Running discovery for pytest using the new test adapter.
2024-12-18 09:49:51.719 [info] Discover tests for workspace name: project2 - uri: /workspaces/project-name/src/project2
2024-12-18 09:49:51.719 [info] Running discovery for pytest using the new test adapter.
2024-12-18 09:49:51.719 [info] Discover tests for workspace name: project3 - uri: /workspaces/project-name/src/project3
2024-12-18 09:49:51.719 [info] Running discovery for pytest using the new test adapter.
2024-12-18 09:49:51.719 [info] Discover tests for workspace name: project4 - uri: /workspaces/project-name/src/project4
2024-12-18 09:49:51.719 [info] Running discovery for pytest using the new test adapter.
2024-12-18 09:49:51.719 [info] Discover tests for workspace name: project5 - uri: /workspaces/project-name/src/project5
2024-12-18 09:49:51.719 [info] Running discovery for pytest using the new test adapter.
2024-12-18 09:53:28.441 [info] Discover tests for workspace name: all - uri: /workspaces/project-name
2024-12-18 09:53:28.441 [info] Running discovery for pytest using the new test adapter.
2024-12-18 09:53:28.441 [info] Discover tests for workspace name: project1 - uri: /workspaces/project-name/src/project1
2024-12-18 09:53:28.441 [info] Discover tests for workspace name: project1_api - uri: /workspaces/project-name/src/project1_api
2024-12-18 09:53:28.441 [info] Running discovery for pytest using the new test adapter.
2024-12-18 09:53:28.441 [info] Discover tests for workspace name: project2 - uri: /workspaces/project-name/src/project2
2024-12-18 09:53:28.441 [info] Running discovery for pytest using the new test adapter.
2024-12-18 09:53:28.441 [info] Discover tests for workspace name: project3 - uri: /workspaces/project-name/src/project3
2024-12-18 09:53:28.441 [info] Running discovery for pytest using the new test adapter.
2024-12-18 09:53:28.441 [info] Discover tests for workspace name: project4 - uri: /workspaces/project-name/src/project4
2024-12-18 09:53:28.441 [info] Running discovery for pytest using the new test adapter.
2024-12-18 09:53:28.441 [info] Discover tests for workspace name: project5 - uri: /workspaces/project-name/src/project5
2024-12-18 09:53:28.441 [info] Running discovery for pytest using the new test adapter.
2024-12-18 09:53:28.448 [error] Test discovery already in progress, not starting a new one.
2024-12-18 09:53:28.448 [error] Test discovery already in progress, not starting a new one.
2024-12-18 09:53:28.448 [error] Test discovery already in progress, not starting a new one.
2024-12-18 09:53:28.448 [error] Test discovery already in progress, not starting a new one.
2024-12-18 09:53:28.448 [error] Test discovery already in progress, not starting a new one.
2024-12-18 09:53:28.448 [error] Test discovery already in progress, not starting a new one.
2024-12-18 09:53:28.448 [error] Test discovery already in progress, not starting a new one.

and it stays here forever

[adamkaplan]

I am experiencing the same symptoms and same Pytest discovery log file as above. This coincided with an update to macOS Sequoia the night before.

I have tried clearing ~/Library/Application Support/Code and ~/.vscode, and all caches in the project workspace and restarting my computer.

Also, there are other extensions that don't seem to work (never return results to UI) such as Github Copilot chat, running the Python Debugger, the Source Control commit graph, etc.

[jcorioland]

Actually seems to be related to the vscode-python extension, check this issue: microsoft/vscode-python#24613 - switching to the pre-release fix the hanging issue in the Test Explorer for me.

[chrmarti]

Could others seeing this also try with the latest pre-release of the Python extension and let us know if that fixes it? Thanks! /cc @eleanorjboyd

[graysddoman]

Switching to the pre-release version also stops the hanging issue for me. Thank you! /cc @eleanorjboyd

[chrmarti]

Great, thanks! Closing as duplicate of microsoft/vscode-python#24613.

If the Python extension is installed automatically with the Dev Container you can add the following to the devcontainer.json to automatically get the pre-release version next time you rebuild:

	"customizations": {
		"vscode": {
			"extensions": [
				"ms-python.python@prerelease"
			]
		}
	}

[eleanorjboyd]

Hi! For further info see microsoft/vscode-python#24656