catastrophic failure discovering TestCase with short id (e.g. doctests) #25380
Description
Type: Bug
Behaviour
Test pane runs no tests and has "Show output to view error logs" message
Steps to reproduce:
-
Create a file
foo.pyin your workspace:#!/usr/bin/env python3 """ >>> 2 + 2 4 """ # (useless module does nothing, just has a single module-level test)
-
Create a file
test_foo.pyin your workspace:import unittest import doctest import foo def load_tests(loader, tests, ignore): "https://docs.python.org/3/library/doctest.html#unittest-api" tests.addTests(doctest.DocTestSuite(foo)) return tests
-
Run command,
Python: Configure Tests>unittest>.(Root Directory) >test_*.py(4th option); it will create this file.vscode\settings.jsonin your workspace:{ "python.testing.unittestArgs": [ "-v", "-s", ".", "-p", "test_*.py" ], "python.testing.pytestEnabled": false, "python.testing.unittestEnabled": true }
Diagnostic data
Output for Python in the Output panel (View→Output, change the drop-down the upper-right of the Output panel to Python)
2025-08-11 11:45:58.895 [info] Discover tests for workspace name: foo- uri: c:\…\foo
2025-08-11 11:45:59.321 [error] Unittest test discovery error for workspace: c:\…\foo
Traceback (most recent call last):
File "c:\…\.vscode\extensions\ms-python.python-2025.12.0-win32-x64\python_files\unittestadapter\discovery.py", line 81, in discover_tests
tests, error = build_test_tree(suite, top_level_dir) # test tree built successfully here.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "c:\…\.vscode\extensions\ms-python.python-2025.12.0-win32-x64\python_files\unittestadapter\pvsc_utils.py", line 217, in build_test_tree
*folders, filename, class_name, function_name = components
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ValueError: not enough values to unpack (expected at least 3, got 1)
Extension version: 2025.10.0
VS Code version: Code 1.101.2 (2901c5ac6db8a986a5666c3af51ff804d05af0d4, 2025-06-24T20:27:15.391Z)
OS version: Windows_NT x64 10.0.22631
Modes:
- Python version (& distribution if applicable, e.g. Anaconda): 7.3.19
- Type of virtual environment used (e.g. conda, venv, virtualenv, etc.): Unknown
Details
| Item | Value |
|---|---|
| CPUs | 11th Gen Intel(R) Core(TM) i5-1145G7 @ 2.60GHz (8 x 1498) |
| 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) | 15.39GB (3.74GB free) |
| Process Argv | --crash-reporter-id 82702992-6f5e-40fb-afd0-bb10fcc152ac |
| Screen Reader | no |
| VM | 0% |
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