VSCode Pytest fails when python.test.cwd is set.

[cemde]

Type: Bug

Behaviour

When setting "python.testing.cwd": "${workspaceFolder}/src" the testing of python code using the VSCode Testing feature does not work. The indicators for the tests are gray circles, not green ticks or red x. The discovery of tests works. Debugging a test does not work. I get this in Test Results:

Running tests (pytest): /Users/cornelius/Repositories/Debug-Pytest/tests/test_main.py::test_main[1-2-3]
Running test with arguments: --rootdir /Users/cornelius/Repositories/Debug-Pytest/src --override-ini junit_family=xunit1 --junit-xml=/var/folders/z3/mfjy6_6n4lb5lpr3wz1f009h0000gn/T/tmp-28532jOG4caOuJzkq.xml --capture no ./test_main.py::test_main[1-2-3]
Current working directory: /Users/cornelius/Repositories/Debug-Pytest/src
Workspace directory: /Users/cornelius/Repositories/Debug-Pytest
Run completed, parsing output
Error while running tests: 1-2-3
TypeError: Cannot read properties of undefined (reading 'length')

Error while running tests:
TypeError: Cannot read properties of undefined (reading 'length')

Finished running tests!

In the debug console it prints:

============================= test session starts ==============================
platform darwin -- Python 3.12.2, pytest-8.3.2, pluggy-1.5.0
rootdir: /Users/cornelius/Repositories/Debug-Pytest/src
configfile: ../pyproject.toml
plugins: hydra-core-1.3.2
collected 0 items

- generated xml file: /var/folders/z3/mfjy6_6n4lb5lpr3wz1f009h0000gn/T/tmp-28532jOG4caOuJzkq.xml -
============================ no tests ran in 0.00s =============================
ERROR: file or directory not found: ./test_main.py::test_main[1-2-3]

Removing "python.testing.cwd": "${workspaceFolder}/src" makes it work. However, I require the cwd to be set to src/ during testing.

Steps to reproduce:

Create a folder with this structure:

├── Debug-PyTest.code-workspace
├── pyproject.toml
├── src
│   ├── main.py
│   └── utils.py
└── tests
    └── test_main.py

and fill with these contents:

src/main.py

from utils import super_print


def add(a, b):
    return a + b

src/utils.py

def super_print(a):
    print(a + "!!!")

tests/test_main.py

import pytest

from main import add


@pytest.mark.parametrize("a,b,expected", [(1, 2, 3), (2, 3, 5), (3, 4, 7)])
def test_main(a, b, expected):
    assert add(a, b) == expected

Debug-PyTest.code-workspace

{
  "folders": [
    {
      "path": ".",
      "name": "Code"
    },
    {
      "path": "/Users/cornelius/data",
      "name": "Data"
    }
  ],
}

pyproject.toml

[tool.ruff]
line-length = 144

[tool.pytest.ini_options]
testpaths = ["tests"]
pythonpath = "src"
addopts = ["--import-mode=importlib"]

.vscode/settings.json

{
  "python.testing.pytestArgs": ["${workspaceFolder}/tests"],
  "python.testing.unittestEnabled": false,
  "python.testing.pytestEnabled": true,
  "python.testing.cwd": "${workspaceFolder}/src"
}

Diagnostic data

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

Output Panel Empty:

Extension version: 2024.12.3
VS Code version: Code 1.92.1 (eaa41d57266683296de7d118f574d0c2652e1fc4, 2024-08-07T20:16:39.455Z)
OS version: Darwin arm64 23.5.0
Modes:
Connection to 'ssh-remote+7b22686f73744e616d65223a22544f52524e4f44453134227d' could not be established

• Python version (& distribution if applicable, e.g. Anaconda): 3.12.2
• Type of virtual environment used (e.g. conda, venv, virtualenv, etc.): Conda
• Value of the python.languageServer setting: Default

User Settings

Multiroot scenario, following user settings may not apply:

languageServer: "Pylance"

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

Installed Extensions

Extension Name	Extension Id	Version
autoDocstring - Python Docstring Generator	njpwerner.autodocstring	0.6.1
CodeSnap	adpyke.codesnap	1.3.4
CSV to Table	phplasma.csv-to-table	1.4.0
Data Wrangler	ms-toolsai.datawrangler	1.6.0
Dev Containers	ms-vscode-remote.remote-containers	0.380.0
Docker	ms-azuretools.vscode-docker	1.29.2
Duplicate action	mrmlnc.vscode-duplicate	1.2.1
Even Better TOML	tamasfe.even-better-toml	0.19.2
GitHub Copilot	GitHub.copilot	1.222.0
GitHub Copilot Chat	GitHub.copilot-chat	0.18.1
GitHub Pull Requests	GitHub.vscode-pull-request-github	0.94.0
GitLens — Git supercharged	eamodio.gitlens	15.2.3
JavaScript Debugger	ms-vscode.js-debug	1.92.0
JavaScript Debugger Companion Extension	ms-vscode.js-debug-companion	1.1.3
Jupyter	ms-toolsai.jupyter	2024.7.0
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	1.0.19
Jupyter Slide Show	ms-toolsai.vscode-jupyter-slideshow	0.1.6
markdownlint	DavidAnson.vscode-markdownlint	0.55.0
pre-commit-vscode	MarkLarah.pre-commit-vscode	0.1.0
Prettier - Code formatter	esbenp.prettier-vscode	11.0.0
Project Manager	alefragnani.project-manager	12.8.0
Pylance	ms-python.vscode-pylance	2024.8.1
Python	ms-python.python	2024.12.3
Python Debugger	ms-python.debugpy	2024.11.2024081401
Python Environment Manager	donjayamanne.python-environment-manager	1.2.4
Rainbow CSV	mechatroner.rainbow-csv	3.12.0
Remote - SSH	ms-vscode-remote.remote-ssh	0.113.1
Remote - SSH: Editing Configuration Files	ms-vscode-remote.remote-ssh-edit	0.86.0
Remote - Tunnels	ms-vscode.remote-server	1.5.2
Remote Development	ms-vscode-remote.vscode-remote-extensionpack	0.25.0
Remote Explorer	ms-vscode.remote-explorer	0.4.3
Ruff	charliermarsh.ruff	2024.40.0
Table Visualizer for JavaScript Profiles	ms-vscode.vscode-js-profile-table	1.0.9
vscode-pdf	tomoki1207.pdf	1.2.2
WSL	ms-vscode-remote.remote-wsl	0.88.2

System Info

Item	Value
CPUs	Apple M3 Max (14 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)	2, 2, 2
Memory (System)	36.00GB (0.22GB free)
Process Argv	--crash-reporter-id 844bc983-d86d-4dff-8880-b640e9c511f1
Screen Reader	no
VM	0%

Connection to 'ssh-remote+7b22686f73744e616d65223a22544f52524e4f44453134227d' could not be established