Fails to debug pytest tests in conda environment

[MarximusMaximus]

Type: Bug

Behaviour

When attempting to debug run a pytest test within a conda environment, the test never starts.

Steps to reproduce:

1. Install & Enable Python Environments plugin. NOTE: if re-enabling, you MUST reload vscode to experience the issue reliably.
2. Have project that has a conda env.
3. Setup project to use conda env correctly.
4. Test environment setup by running tests WITHOUT debug.
5. Run test or tests WITH debug.
6. Observe failure in terminal.
7. Wait a while, observe error message that eventually appears. "Timed out waiting for launcher to connect"

NOTES:

With plugin enabled, it attempts to

/usr/bin/env /opt/conda/miniforge/envs/pytest-prefer-nested-dup-tests

rather than something like

/usr/bin/env /opt/conda/miniforge/envs/pytest-prefer-nested-dup-tests/bin/python

or

/usr/bin/env python

Diagnostic data

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

Results w/ Plugin Enabled

Output Panel

2025-06-06 19:29:29.733 [info] > pyenv which python
2025-06-06 19:29:29.734 [info] cwd: /Volumes/src with spaces/pytest-prefer-nested-dup-tests
2025-06-06 19:29:31.197 [info] Active interpreter [/Volumes/src with spaces/pytest-prefer-nested-dup-tests]:  /opt/conda/miniforge/envs/pytest-prefer-nested-dup-tests
2025-06-06 19:29:37.627 [info] Starting Pylance language server.
2025-06-06 19:29:37.630 [info] > /opt/conda/miniforge/bin/conda info --json
2025-06-06 19:36:17.392 [info] Discover tests for workspace name: pytest-prefer-nested-dup-tests - uri: /Volumes/src with spaces/pytest-prefer-nested-dup-tests
2025-06-06 19:36:17.398 [info] Environment variables set for pytest discovery: PYTHONPATH=/Users/marximus/.vscode/extensions/ms-python.python-2025.6.1-darwin-arm64/python_files, TEST_RUN_PIPE=/var/folders/4k/r9plgthx7nx2ds7jhrlb4qyw0000gn/T/python-test-discovery-316b0bbcf43a70ccc0f6
2025-06-06 19:36:18.939 [info] ============================= test session starts ==============================
platform darwin -- Python 3.10.17, pytest-8.4.0, pluggy-1.6.0 -- /opt/conda/miniforge/envs/pytest-prefer-nested-dup-tests/bin/python
cachedir: .pytest_cache
metadata: {'Python': '3.10.17', 'Platform': 'macOS-15.4.1-arm64-arm-64bit', 'Packages': {'pytest': '8.4.0', 'pluggy': '1.6.0'}, 'Plugins': {'xdist': '3.7.0', 'anyio': '4.9.0', 'sugar': '1.0.0', 'html': '4.1.1', 'metadata': '3.1.1', 'prefer-nested-dup-tests': '0.1.1.dev0', 'cov': '6.1.1'}, 'PLATFORM': 'Darwin'}
rootdir: /Volumes/src with spaces/pytest-prefer-nested-dup-tests
configfile: pyproject.toml
testpaths: .
plugins: xdist-3.7.0, anyio-4.9.0, sugar-1.0.0, html-4.1.1, metadata-3.1.1, prefer-nested-dup-tests-0.1.1.dev0, cov-6.1.1
collecting ... 
2025-06-06 19:36:19.084 [info] collected 8 items

<Dir pytest-prefer-nested-dup-tests>
  <Package tests>
    <Package deeptest>
      <Package deepertest>
        <Module test___impl.py>
          tests/deeptest/deepertest/test___impl.py (pytest-prefer-nested-dup-tests)
          <Function test___main>
            test___main: simple test to confirm this subpackage of tests loads
            
            Args:
                testdir (PytestFixture):
      <Module test___impl.py>
        tests/deeptest/test___impl.py (pytest-prefer-nested-dup-tests)
        <Function test___main>
          test___main: simple test to confirm this subpackage of tests loads
          
          Args:
              testdir (PytestFixture):
    <Module test___impl.py>
      tests/test___impl.py (pytest-prefer-nested-dup-tests)
      <Function test___main>
        test___main: simple test to confirm this subpackage of tests loads
        
        Args:
            testdir (PytestFixture):
      <Function test_drop_duplicated_dir>
        test_drop_duplicated_dir tests if same toplevel dir is found twice
        
        Args:
            testdir (PytestFixture):
      <Function test_drop_duplicated_pkg>
        test_drop_duplicated_pkg tests if same toplevel package is found twice
        
        
        Args:
            testdir (PytestFixture):
      <Function test_drop_duplicated_files>
        test_drop_duplicated_files tests if same toplevel file is found twice
        
        Args:
            testdir (PytestFixture):
      <Function test_nested_package>
        test_nested_package tests finding nested packages and reporting them as nested
        
        Args:
            testdir (PytestFixture): _description_
      <Function test___toplevel_coverage>
        test___toplevel_coverage is only to allow coverage.py to see the top level and
            outermost scope of our code
        
        Args:
            testdir (PytestFixture):

================================ tests coverage ================================
______________ coverage: platform darwin, python 3.10.17-final-0 _______________

Name                                           Stmts   Miss Branch BrPart  Cover   Missing
------------------------------------------------------------------------------------------
src/pytest_prefer_nested_dup_tests/__impl.py      25      8      6      0    74%   13-62, 76
tests/__init__.py                                  0      0      0      0   100%
tests/conftest.py                                  2      0      0      0   100%
tests/deeptest/__init__.py                         0      0      0      0   100%
tests/deeptest/deepertest/__init__.py              0      0      0      0   100%
tests/deeptest/deepertest/test___impl.py           5      2      0      0    60%   44-45
tests/deeptest/test___impl.py                      5      2      0      0    60%   44-45
tests/test___impl.py                              47     38      2      0    22%   43-44, 55-67, 79-94, 105-125, 138-205, 224-239
------------------------------------------------------------------------------------------
TOTAL                                             84     50      8      0    46%
Coverage HTML written to dir htmlcov
Coverage XML written to file coverage.xml
- Generated html report: file:///Volumes/src%20with%20spaces/pytest-prefer-nested-dup-tests/.reports/test-report-coverage.html -
========================== 8 tests collected in 0.12s ==========================

2025-06-06 19:37:41.759 [info] > /opt/conda/miniforge/bin/conda run -p /opt/conda/miniforge/envs/pytest-prefer-nested-dup-tests --no-capture-output python ~/.vscode/extensions/ms-python.python-2025.6.1-darwin-arm64/python_files/get_output_via_markers.py ~/.vscode/extensions/ms-python.python-2025.6.1-darwin-arm64/python_files/printEnvVariables.py
2025-06-06 19:37:41.759 [info] shell: bash
2025-06-06 19:37:43.146 [info] arg: --rootdir already exists in args, not adding.
2025-06-06 19:37:43.146 [info] Attempting to use temp directory for test ids file, file name: test-ids-c7c77bfc51a48742b5dd.txt
2025-06-06 19:37:43.147 [info] Environment variables set for pytest execution: PYTHONPATH=/Users/marximus/.vscode/extensions/ms-python.python-2025.6.1-darwin-arm64/python_files, TEST_RUN_PIPE=/var/folders/4k/r9plgthx7nx2ds7jhrlb4qyw0000gn/T/python-test-results-843f72083d2469fde2fb, RUN_TEST_IDS_PIPE=/var/folders/4k/r9plgthx7nx2ds7jhrlb4qyw0000gn/T/test-ids-c7c77bfc51a48742b5dd.txt
2025-06-06 19:37:43.147 [info] Running DEBUG pytest with arguments: --rootdir=/Volumes/src with spaces/pytest-prefer-nested-dup-tests,--capture=no for workspace /Volumes/src with spaces/pytest-prefer-nested-dup-tests 

2025-06-06 19:37:43.147 [info] Using configuration in launch.json
2025-06-06 19:37:43.389 [info] CreateEnv Trigger - Skipping for /Volumes/src with spaces/pytest-prefer-nested-dup-tests

Terminal

Last Login:                      Thu Jun  5 03:07   still logged in
 /usr/bin/env /opt/conda/miniforge/envs/pytest-prefer-nested-dup-tests /Users/marximus/.vscode/extensions/ms-python.debugpy-2025.8.0-darwin-arm64/bundled/libs/debugpy/adapter/../../debugpy/launcher 55505 -- /Users/marximus/.vscode/extensions/ms-python.python-2025.6.1-darwin-arm64/python_files/vscode_pytest/run_pytest_script.py --rootdir=/Volumes/src\ with\ spaces/pytest-prefer-nested-dup-tests --capture=no 
(placeholder) heptagearogram-2:pytest-prefer-nested-dup-tests marximus$  /usr/bin/env /opt/conda/minifor
ge/envs/pytest-prefer-nested-dup-tests /Users/marximus/.vscode/extensions/ms-python.debugpy-2025.8.0-dar
win-arm64/bundled/libs/debugpy/adapter/../../debugpy/launcher 55505 -- /Users/marximus/.vscode/extension
s/ms-python.python-2025.6.1-darwin-arm64/python_files/vscode_pytest/run_pytest_script.py --rootdir=/Volu
mes/src\ with\ spaces/pytest-prefer-nested-dup-tests --capture=no 
env: /opt/conda/miniforge/envs/pytest-prefer-nested-dup-tests: Permission denied
(placeholder) heptagearogram-2:pytest-prefer-nested-dup-tests marximus$     

After while, an error popup message appears, "Timed out waiting for launcher to connect", "Open 'launch.json'", "Cancel".

Expected Results / With plugin disabled

With the plugin disabled the following results occur and are what are expected behavior.

Output Panel

2025-06-06 19:40:42.170 [info] Native locator: Refresh started
2025-06-06 19:40:42.170 [info] > pyenv which python
2025-06-06 19:40:42.170 [info] cwd: /Volumes/src with spaces/pytest-prefer-nested-dup-tests
2025-06-06 19:40:43.681 [info] > /opt/conda/miniforge/bin/conda info --json
2025-06-06 19:40:47.546 [info] Conda environment manager found at: /opt/conda/miniforge/bin/conda
2025-06-06 19:40:47.546 [info] Using conda from setting: /opt/conda/miniforge/bin/conda
2025-06-06 19:40:47.648 [info] Conda environment manager found at: /Users/marximus/miniforge3/bin/conda
2025-06-06 19:40:47.648 [info] Conda set to: /opt/conda/miniforge/bin/conda
2025-06-06 19:40:47.672 [info] Conda environment manager found at: /Users/marximus/miniforge3builder/bin/conda
2025-06-06 19:40:47.672 [info] Conda set to: /opt/conda/miniforge/bin/conda
2025-06-06 19:40:47.705 [info] Native locator: Refresh finished in 6254 ms
2025-06-06 19:40:49.064 [info] Python interpreter path: /opt/conda/miniforge/envs/pytest-prefer-nested-dup-tests/bin/python
2025-06-06 19:40:51.530 [info] Starting Pylance language server.
2025-06-06 19:41:10.841 [info] Discover tests for workspace name: pytest-prefer-nested-dup-tests - uri: /Volumes/src with spaces/pytest-prefer-nested-dup-tests
2025-06-06 19:41:10.846 [info] Environment variables set for pytest discovery: PYTHONPATH=/Users/marximus/.vscode/extensions/ms-python.python-2025.6.1-darwin-arm64/python_files, TEST_RUN_PIPE=/var/folders/4k/r9plgthx7nx2ds7jhrlb4qyw0000gn/T/python-test-discovery-61938b62d9fa07a4a2d0
2025-06-06 19:41:10.847 [info] > /opt/conda/miniforge/bin/conda run -p /opt/conda/miniforge/envs/pytest-prefer-nested-dup-tests --no-capture-output python ~/.vscode/extensions/ms-python.python-2025.6.1-darwin-arm64/python_files/get_output_via_markers.py ~/.vscode/extensions/ms-python.python-2025.6.1-darwin-arm64/python_files/printEnvVariables.py
2025-06-06 19:41:10.847 [info] shell: bash
2025-06-06 19:41:12.254 [info] > /opt/conda/miniforge/bin/conda run -p /opt/conda/miniforge/envs/pytest-prefer-nested-dup-tests --no-capture-output python ~/.vscode/extensions/ms-python.python-2025.6.1-darwin-arm64/python_files/get_output_via_markers.py -m pytest -p vscode_pytest --collect-only "--rootdir=/Volumes/src with spaces/pytest-prefer-nested-dup-tests"
2025-06-06 19:41:12.254 [info] cwd: /Volumes/src with spaces/pytest-prefer-nested-dup-tests
2025-06-06 19:41:13.294 [info] >>>PYTHON-EXEC-OUTPUT

2025-06-06 19:41:13.609 [info] ============================= test session starts ==============================
platform darwin -- Python 3.10.17, pytest-8.4.0, pluggy-1.6.0 -- /opt/conda/miniforge/envs/pytest-prefer-nested-dup-tests/bin/python

2025-06-06 19:41:13.615 [info] cachedir: .pytest_cache
metadata: {'Python': '3.10.17', 'Platform': 'macOS-15.4.1-arm64-arm-64bit', 'Packages': {'pytest': '8.4.0', 'pluggy': '1.6.0'}, 'Plugins': {'xdist': '3.7.0', 'anyio': '4.9.0', 'sugar': '1.0.0', 'html': '4.1.1', 'metadata': '3.1.1', 'prefer-nested-dup-tests': '0.1.1.dev0', 'cov': '6.1.1'}, 'PLATFORM': 'Darwin'}
rootdir: /Volumes/src with spaces/pytest-prefer-nested-dup-tests
2025-06-06 19:41:13.615 [info] 
configfile: pyproject.toml
testpaths: .
plugins: xdist-3.7.0, anyio-4.9.0, sugar-1.0.0, html-4.1.1, metadata-3.1.1, prefer-nested-dup-tests-0.1.1.dev0, cov-6.1.1
collecting ... 
2025-06-06 19:41:13.653 [info] collected 8 items

2025-06-06 19:41:13.653 [info] 
<Dir pytest-prefer-nested-dup-tests>
  <Package tests>
    <Package deeptest>
      <Package deepertest>
        <Module test___impl.py>
          tests/deeptest/deepertest/test___impl.py (pytest-prefer-nested-dup-tests)
          <Function test___main>
            test___main: simple test to confirm this subpackage of tests loads
            
            Args:
                testdir (PytestFixture):
      <Module test___impl.py>
        tests/deeptest/test___impl.py (pytest-prefer-nested-dup-tests)
        <Function test___main>
          test___main: simple test to confirm this subpackage of tests loads
          
          Args:
              testdir (PytestFixture):
    <Module test___impl.py>
      tests/test___impl.py (pytest-prefer-nested-dup-tests)
      <Function test___main>
        test___main: simple test to confirm this subpackage of tests loads
        
        Args:
            testdir (PytestFixture):
      <Function test_drop_duplicated_dir>
        test_drop_duplicated_dir tests if same toplevel dir is found twice
        
        Args:
            testdir (PytestFixture):
      <Function test_drop_duplicated_pkg>
        test_drop_duplicated_pkg tests if same toplevel package is found twice
        
        
        Args:
            testdir (PytestFixture):
      <Function test_drop_duplicated_files>
        test_drop_duplicated_files tests if same toplevel file is found twice
        
        Args:
            testdir (PytestFixture):
      <Function test_nested_package>
        test_nested_package tests finding nested packages and reporting them as nested
        
        Args:
            testdir (PytestFixture): _description_

2025-06-06 19:41:13.653 [info]       <Function test___toplevel_coverage>
        test___toplevel_coverage is only to allow coverage.py to see the top level and
            outermost scope of our code
        
        Args:
            testdir (PytestFixture):

2025-06-06 19:41:13.725 [info] 
================================ tests coverage ================================
______________ coverage: platform darwin, python 3.10.17-final-0 _______________

Name                                           Stmts   Miss Branch BrPart  Cover   Missing
------------------------------------------------------------------------------------------
src/pytest_prefer_nested_dup_tests/__impl.py      25      8      6      0    74%   13-62, 76
tests/__init__.py                                  0      0      0      0   100%
tests/conftest.py                                  2      0      0      0   100%
tests/deeptest/__init__.py                         0      0      0      0   100%
tests/deeptest/deepertest/__init__.py              0      0      0      0   100%
tests/deeptest/deepertest/test___impl.py           5      2      0      0    60%   44-45
tests/deeptest/test___impl.py                      5      2      0      0    60%   44-45
tests/test___impl.py                              47     38      2      0    22%   43-44, 55-67, 79-94, 105-125, 138-205, 224-239
------------------------------------------------------------------------------------------
TOTAL                                             84     50      8      0    46%
Coverage HTML written to dir htmlcov
Coverage XML written to file coverage.xml
- Generated html report: file:///Volumes/src%20with%20spaces/pytest-prefer-nested-dup-tests/.reports/test-report-coverage.html -
========================== 8 tests collected in 0.12s ==========================

2025-06-06 19:41:13.787 [info] <<<PYTHON-EXEC-OUTPUT

2025-06-06 19:41:19.404 [info] arg: --rootdir already exists in args, not adding.
2025-06-06 19:41:19.404 [info] Attempting to use temp directory for test ids file, file name: test-ids-ba77c50b8c2df62b2305.txt
2025-06-06 19:41:19.405 [info] Environment variables set for pytest execution: PYTHONPATH=/Users/marximus/.vscode/extensions/ms-python.python-2025.6.1-darwin-arm64/python_files, TEST_RUN_PIPE=/var/folders/4k/r9plgthx7nx2ds7jhrlb4qyw0000gn/T/python-test-results-cf3cdda29de069fa3d28, RUN_TEST_IDS_PIPE=/var/folders/4k/r9plgthx7nx2ds7jhrlb4qyw0000gn/T/test-ids-ba77c50b8c2df62b2305.txt
2025-06-06 19:41:19.405 [info] Running DEBUG pytest with arguments: --rootdir=/Volumes/src with spaces/pytest-prefer-nested-dup-tests,--capture=no for workspace /Volumes/src with spaces/pytest-prefer-nested-dup-tests 

2025-06-06 19:41:19.406 [info] Using configuration in launch.json
2025-06-06 19:41:19.623 [info] CreateEnv Trigger - Skipping for /Volumes/src with spaces/pytest-prefer-nested-dup-tests
2025-06-06 19:41:20.050 [info] > /opt/conda/miniforge/bin/conda info --json
2025-06-06 19:41:20.548 [info] Send text to terminal: conda activate pytest-prefer-nested-dup-tests
2025-06-06 19:41:36.945 [info] Test Result named pipe /var/folders/4k/r9plgthx7nx2ds7jhrlb4qyw0000gn/T/python-test-results-cf3cdda29de069fa3d28  cancelled

Terminal

conda activate pytest-prefer-nested-dup-tests
Last Login:                      Thu Jun  5 03:07   still logged in
 /usr/bin/env /opt/conda/miniforge/envs/pytest-prefer-nested-dup-tests/bin/python /Users/marximus/.vscode/extensions/ms-python.debugpy-2025.8.0-darwin-arm64/bundled/libs/debugpy/adapter/../../debugpy/launcher 55664 -- /Users/marximus/.vscode/extensions/ms-python.python-2025.6.1-darwin-arm64/python_files/vscode_pytest/run_pytest_script.py --rootdir=/Volumes/src\ with\ spaces/pytest-prefer-nested-dup-tests --capture=no 
(placeholder) heptagearogram-2:pytest-prefer-nested-dup-tests marximus$ conda activate pytest-prefer-nes
ted-dup-tests
(pytest-prefer-nested-dup-tests) heptagearogram-2:pytest-prefer-nested-dup-tests marximus$  /usr/bin/env
 /opt/conda/miniforge/envs/pytest-prefer-nested-dup-tests/bin/python /Users/marximus/.vscode/extensions/
ms-python.debugpy-2025.8.0-darwin-arm64/bundled/libs/debugpy/adapter/../../debugpy/launcher 55664 -- /Us
ers/marximus/.vscode/extensions/ms-python.python-2025.6.1-darwin-arm64/python_files/vscode_pytest/run_py
test_script.py --rootdir=/Volumes/src\ with\ spaces/pytest-prefer-nested-dup-tests --capture=no 
Running pytest with args: ['-p', 'vscode_pytest', '--rootdir=/Volumes/src with spaces/pytest-prefer-nested-dup-tests', '--capture=no', '/Volumes/src with spaces/pytest-prefer-nested-dup-tests/tests/test___impl.py::test_nested_package']
============================= test session starts ==============================
platform darwin -- Python 3.10.17, pytest-8.4.0, pluggy-1.6.0 -- /opt/conda/miniforge/envs/pytest-prefer-nested-dup-tests/bin/python
cachedir: .pytest_cache
metadata: {'Python': '3.10.17', 'Platform': 'macOS-15.4.1-arm64-arm-64bit', 'Packages': {'pytest': '8.4.0', 'pluggy': '1.6.0'}, 'Plugins': {'xdist': '3.7.0', 'anyio': '4.9.0', 'sugar': '1.0.0', 'html': '4.1.1', 'metadata': '3.1.1', 'prefer-nested-dup-tests': '0.1.1.dev0', 'cov': '6.1.1'}, 'PLATFORM': 'Darwin'}
rootdir: /Volumes/src with spaces/pytest-prefer-nested-dup-tests
configfile: pyproject.toml
plugins: xdist-3.7.0, anyio-4.9.0, sugar-1.0.0, html-4.1.1, metadata-3.1.1, prefer-nested-dup-tests-0.1.1.dev0, cov-6.1.1
collecting ... collected 1 item

tests/test___impl.py::test_nested_package ============================= test session starts ==============================
platform darwin -- Python 3.10.17, pytest-8.4.0, pluggy-1.6.0 -- /opt/conda/miniforge/envs/pytest-prefer-nested-dup-tests/bin/python
cachedir: .pytest_cache
metadata: {'Python': '3.10.17', 'Platform': 'macOS-15.4.1-arm64-arm-64bit', 'Packages': {'pytest': '8.4.0', 'pluggy': '1.6.0'}, 'Plugins': {'xdist': '3.7.0', 'anyio': '4.9.0', 'html': '4.1.1', 'metadata': '3.1.1', 'prefer-nested-dup-tests': '0.1.1.dev0', 'cov': '6.1.1'}, 'PLATFORM': 'Darwin'}
rootdir: /private/var/folders/4k/r9plgthx7nx2ds7jhrlb4qyw0000gn/T/pytest-of-marximus/pytest-33/test_nested_package0
plugins: xdist-3.7.0, anyio-4.9.0, html-4.1.1, metadata-3.1.1, prefer-nested-dup-tests-0.1.1.dev0, cov-6.1.1
collecting ... collected 2 items

<Dir test_nested_package0>
  <Package tests>
    <Package bar>
      <Module test_bar.py>
        <Function test_bar>
    <Package foo>
      <Module test_foo.py>
        <Function test_foo>

========================== 2 tests collected in 0.01s ==========================
============================= test session starts ==============================
platform darwin -- Python 3.10.17, pytest-8.4.0, pluggy-1.6.0 -- /opt/conda/miniforge/envs/pytest-prefer-nested-dup-tests/bin/python
cachedir: .pytest_cache
metadata: {'Python': '3.10.17', 'Platform': 'macOS-15.4.1-arm64-arm-64bit', 'Packages': {'pytest': '8.4.0', 'pluggy': '1.6.0'}, 'Plugins': {'xdist': '3.7.0', 'anyio': '4.9.0', 'html': '4.1.1', 'metadata': '3.1.1', 'prefer-nested-dup-tests': '0.1.1.dev0', 'cov': '6.1.1'}, 'PLATFORM': 'Darwin'}
rootdir: /private/var/folders/4k/r9plgthx7nx2ds7jhrlb4qyw0000gn/T/pytest-of-marximus/pytest-33/test_nested_package0
plugins: xdist-3.7.0, anyio-4.9.0, html-4.1.1, metadata-3.1.1, prefer-nested-dup-tests-0.1.1.dev0, cov-6.1.1
collecting ... collected 2 items

tests/bar/test_bar.py::test_bar PASSED                                   [ 50%]
tests/foo/test_foo.py::test_foo PASSED                                   [100%]

============================== 2 passed in 0.02s ===============================
============================= test session starts ==============================
platform darwin -- Python 3.10.17, pytest-8.4.0, pluggy-1.6.0
rootdir: /private/var/folders/4k/r9plgthx7nx2ds7jhrlb4qyw0000gn/T/pytest-of-marximus/pytest-33/test_nested_package0
plugins: xdist-3.7.0, anyio-4.9.0, html-4.1.1, metadata-3.1.1, prefer-nested-dup-tests-0.1.1.dev0, cov-6.1.1
collected 2 items

<Dir test_nested_package0>
  <Package tests>
    <Package foo>
      <Module test_foo.py>
        <Function test_foo>
    <Package bar>
      <Module test_bar.py>
        <Function test_bar>

========================== 2 tests collected in 0.01s ==========================
PASSED

================================ tests coverage ================================
______________ coverage: platform darwin, python 3.10.17-final-0 _______________

Name                                           Stmts   Miss Branch BrPart  Cover   Missing
------------------------------------------------------------------------------------------
src/pytest_prefer_nested_dup_tests/__impl.py      25      8      6      0    74%   13-62, 76
tests/__init__.py                                  0      0      0      0   100%
tests/conftest.py                                  2      0      0      0   100%
tests/deeptest/__init__.py                         0      0      0      0   100%
tests/deeptest/deepertest/__init__.py              0      0      0      0   100%
tests/deeptest/deepertest/test___impl.py           5      5      0      0     0%   12-45
tests/deeptest/test___impl.py                      5      5      0      0     0%   12-45
tests/test___impl.py                              47     23      2      0    53%   43-44, 55-67, 79-94, 105-125, 224-239
------------------------------------------------------------------------------------------
TOTAL                                             84     41      8      0    55%
Coverage HTML written to dir htmlcov
Coverage XML written to file coverage.xml
- Generated html report: file:///Volumes/src%20with%20spaces/pytest-prefer-nested-dup-tests/.reports/test-report-coverage.html -
============================== 1 passed in 0.45s ===============================
(pytest-prefer-nested-dup-tests) heptagearogram-2:pytest-prefer-nested-dup-tests marximus$ 

Extension version: 0.3.11561010
VS Code version: Code 1.100.3 (Universal) (258e40fedc6cb8edf399a463ce3a9d32e7e1f6f3, 2025-06-02T13:30:54.273Z)
OS version: Darwin arm64 24.4.0
Modes:

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[falkben]

I'm seeing this same error

[joshvote]

Same issue on Ubuntu 24.04.2 LTS and vscode 1.101.2 / 1.96.2. My workspace has been working fine for the last year or so, the exact same debug issue only started appearing in the last 24 hours for me. Rolling back python-environment extension version has made no difference. No other (obvious) changes have been made.

Swapping python environments (even fresh envs) makes no difference.

I do see the following error in the integrated console, it appears to not be fully resolving the path to the python executable:

/usr/bin/env /home/josh/miniconda3/envs/envoy311 /home/josh/.vscode/extensions/ms-python.debugpy-2025.8.0-linux-x64/bundled/libs/debugpy/adapter/../../debugpy/launcher 36503 -- /home/josh/.vscode/extensions/ms-python.python-2025.8.0-linux-x64/python_files/vscode_pytest/run_pytest_script.py --rootdir=/home/josh/code/utility-server 
. /home/josh/miniconda3/etc/profile.d/conda.sh && conda activate envoy311
/usr/bin/env: ‘/home/josh/miniconda3/envs/envoy311’: Permission denied 

[kevin-nocklo]

I believe I have a related issue on Ubuntu 22.04. For me, the "Test" extension fails to discover python tests when this extension is activated. It simply never finishes the discovery. If I tell it to restart the discovery, the output gives a warning like:

2025-07-08 15:38:26.644 [error] Test discovery already in progress, not starting a new one.

[kielpins-nearmap]

This is a blocker for my use of VSCode. I'll have to go back to PyCharm if it's not solved.

[MarximusMaximus]

@kielpins-nearmap Workaround is posted above. Just disable the plugin and use the old way.

[kielpins-nearmap]

@kielpins-nearmap Workaround is posted above. Just disable the plugin and use the old way.

I don't see any workaround posted above.

[RaphaelMelanconAtBentley]

Same issue here. Tests just do not start.

[eleanorjboyd]

sorry everyone- will investigate!

[MarximusMaximus]

@kielpins-nearmap Workaround is posted above. Just disable the plugin and use the old way.

I don't see any workaround posted above.

Apologies, I swore I put in how to run it successfully without the plugin in the top post. All I did was disable the Python Environments plugin and use the old builtin (deprecated) way until it is fixed. AFAICT I didn't do anything special, but the project is a bit old -- it predates the plugin, so it may have had leftover configurations. If just disabling doesn't work for you, I can dive deeper into my project to try to find anything useful for configurations.

[ChrisReinke]

I have the same problem when using the IDE buttons to "Debug Test".

I get a "Failed to spawn launcher: [Errno 13] Permission denied: [PATH TO MY CONDA ENV]"

As a workaround, I created custom launcher configurations in my ".vscode/launch.json".

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Python Debugger: Current File",
            "type": "debugpy",
            "request": "launch",
            "program": "${file}",
            "console": "integratedTerminal"
        },
        {
            "name": "Run Pytest",
            "type": "debugpy",
            "request": "launch",
            "module": "pytest",
            "args": ["tests/"],
            "console": "integratedTerminal"
        },
        {
            "name": "Run Current Pytest File",
            "type": "debugpy",
            "request": "launch",
            "module": "pytest",
            "args": ["${relativeFileDirname}/${fileBasename}"],
            "console": "integratedTerminal"
        }
    ]
}

When I run ("Run and Debug" Panel and F5) the "Run Pytest" (runs all pytest files under the tests directory) or "Run Current Pytest File" (runs the currently open file), then I can debug them.

However, it does not allow me to run a specific test in my open file.

[tsbertalan]

I've found that if I change

"python-envs.defaultEnvManager": "ms-python.python:conda",
"python-envs.defaultPackageManager": "ms-python.python:conda",

to

"python-envs.defaultEnvManager": "ms-python.python:system",
"python-envs.defaultPackageManager": "ms-python.python:pip",

in PROJECT/.vscode/settings.json, and again "Python: Select Interpreter" to my conda env, I can now debug individual tests from the test UI panel again. I note that this changes my regular "Run Python File" command from

conda run --live-stream --name CONDAENVNAME python FULLPYFILEPATH

back to

HOME/miniforge3/envs/CONDAENVNAME/bin/python FULLPYFILEPATH

like it was until a couple weeks ago. I bet there was some incomplete change to how programs are invoked in a conda environment that got pushed out.

[tomfrankkirk]

Also having this same issue Version: 1.103.0 (Universal)
Commit: e3550cfac4b63ca4eafca7b601f0d2885817fd1f, on macOS 15.6.

I tried the fix suggested by @tsbertalan but whenever test discovery runs it resets those settings to

"python-envs.defaultEnvManager": "ms-python.python:conda",
"python-envs.defaultPackageManager": "ms-python.python:conda"

[kielpins-nearmap]

Related to this, which the debugpy team declined to address. My workaround was to completely delete all VSCode extensions by deleting the .vscode / .vscode-server directory. This is a pretty poor workaround, as I lost all my settings, but at least debugging pytest is working now.