Python debug test unable to step into third party module

[steve148]

Type: Bug

Behaviour

Expected
When running a python test in debug mode with justMyCode set to false, I should be able to step into and debug third party modules.

Actual
Since v1.92, third party modules are unable to be stepped into with VSCode.

Steps to reproduce:

1. Clone the demo repo I created at https://github.com/steve148/vscode-test-debug-bug
2. Install the dependencies with poetry.
3. Set a break point at the call to the third party module.
4. Run the test in debug mode.
5. Try to step into the third party module.

Diagnostic data

launch.json configuration

{
    // Use IntelliSense to learn about possible attributes.
    // Hover to view descriptions of existing attributes.
    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Python: Debug Tests",
            "type": "python",
            "request": "launch",
            "program": "${file}",
            "purpose": [
                "debug-test"
            ],
            "console": "integratedTerminal",
            "logToFile": true,
            "justMyCode": false
        }
    ]
}

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

2024-11-05 22:31:20.287 [warning] Dir "/Users/lennoxstevenson/dev/vscode-test-debug-bug/.pixi/envs" is not watchable (directory does not exist)
2024-11-05 22:31:20.287 [info] VS Code was launched from an activated environment: '.venv', selecting it as the interpreter for workspace.
2024-11-05 22:31:20.287 [info] Python interpreter path: ./.venv/bin/python
2024-11-05 22:31:21.711 [info] > pyenv which python
2024-11-05 22:31:21.711 [info] cwd: .
2024-11-05 22:31:21.735 [info] > conda info --json
2024-11-05 22:31:24.556 [info] Starting Pylance language server.
2024-11-05 22:31:25.671 [info] Discover tests for workspace name: vscode-test-debug-bug - uri: /Users/lennoxstevenson/dev/vscode-test-debug-bug
2024-11-05 22:31:25.683 [info] > . ./.venv/bin/activate && echo 'e8b39361-0157-4923-80e1-22d70d46dee6' && python ~/.vscode/extensions/ms-python.python-2024.18.0-darwin-arm64/python_files/printEnvVariables.py
2024-11-05 22:31:25.683 [info] shell: bash
2024-11-05 22:31:25.716 [info] > ./.venv/bin/python ~/.vscode/extensions/ms-python.python-2024.18.0-darwin-arm64/python_files/testing_tools/run_adapter.py discover pytest -- --rootdir . -s --cache-clear tests
2024-11-05 22:31:25.716 [info] cwd: .
2024-11-05 22:31:30.089 [info] Using configuration in launch.json
2024-11-05 22:31:30.840 [info] CreateEnv Trigger - Skipping for /Users/lennoxstevenson/dev/vscode-test-debug-bug
2024-11-05 22:31:32.684 [info] DAP Server launched with command: /Users/lennoxstevenson/dev/vscode-test-debug-bug/.venv/bin/python /Users/lennoxstevenson/.vscode/extensions/ms-python.debugpy-2024.12.0-darwin-arm64/bundled/libs/debugpy/adapter --log-dir /Users/lennoxstevenson/.vscode/extensions/ms-python.python-2024.18.0-darwin-arm64
2024-11-05 22:31:32.855 [info] Send text to terminal: source /Users/lennoxstevenson/dev/vscode-test-debug-bug/.venv/bin/activate.fish
2024-11-05 22:31:38.576 [info] Using configuration in launch.json
2024-11-05 22:31:38.726 [info] DAP Server launched with command: /Users/lennoxstevenson/dev/vscode-test-debug-bug/.venv/bin/python /Users/lennoxstevenson/.vscode/extensions/ms-python.debugpy-2024.12.0-darwin-arm64/bundled/libs/debugpy/adapter --log-dir /Users/lennoxstevenson/.vscode/extensions/ms-python.python-2024.18.0-darwin-arm64

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

2024-11-05 22:31:21.739 [info] Name: Python Debugger
2024-11-05 22:31:21.739 [info] Module: debugpy

Extension version: 2024.8.0
VS Code version: Code 1.95.1 (65edc4939843c90c34d61f4ce11704f09d3e5cb6, 2024-10-31T05:14:54.222Z)
OS version: Darwin arm64 24.0.0
Modes:

• Python version (& distribution if applicable, e.g. Anaconda): 3.12.7
• Type of virtual environment used (e.g. conda, venv, virtualenv, etc.): VirtualEnvironment

System Info

Item	Value
CPUs	Apple M2 Pro (10 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, 3, 3
Memory (System)	32.00GB (2.91GB free)
Process Argv	. --crash-reporter-id ccefdccc-a241-4b18-a2ac-fb744e259231
Screen Reader	no
VM	0%

[floriandeboissieu]

I experienced the same problem with vscode 1.95 and actually it seems related to the python version. With python 3.12 I couldn't step into the third party module, while with python 3.11 or python 3.10 it was possible.

[bartektrybala]

Same here, I've switched to the older version.
Extensions -> Python Debugger -> Select dropdown near Uninstall -> Install specific version -> 2024.10.0