ModuleNotFoundError and can't run/debug unittest

[davetapley]

Environment data

• VS Code version: 1.60.0
• Extension version (available under the Extensions sidebar): 2021.9.1218897484
• OS and version: MacOS Mojave 10.14.6 (in a Codespace)
• Python version (& distribution if applicable, e.g. Anaconda): 3.9.6 64-bit
• Type of virtual environment used (N/A | venv | virtualenv | conda | ...): pipenv --global
• Relevant/affected Python packages and their versions: N/A
• Relevant/affected Python-related VS Code extensions and their versions: N/A
• Value of the python.languageServer setting: not set

Expected behaviour

unittest tests are automatically detected and show up in testing side bar"

Actual behaviour

They do not, and I get:

Steps to reproduce:

While working on https://github.com/JEFuller/dataclasses-configobj

Running on 2021.9.1191016588 is ✅
but updating to 2021.9.1218897484 is ❌

I can switch between versions and the tests appear and disappear, as show above ⬆️

Logs

Output for Python in the Output panel >

/usr/bin/python3 ~/.vscode-remote/extensions/ms-python.python-2021.9.1218897484/pythonFiles/testing_tools/unittest_discovery.py ./tests test_*.py
cwd: /workspaces/dataclasses-configobj
Error 2021-09-10 02:00:49: Error discovering unittest tests:
 Failed to import test module: test_core
Traceback (most recent call last):
  File "/usr/lib/python3.9/unittest/loader.py", line 436, in _find_test_path
    module = self._get_module_from_name(name)
  File "/usr/lib/python3.9/unittest/loader.py", line 377, in _get_module_from_name
    __import__(name)
  File "/workspaces/dataclasses-configobj/tests/test_core.py", line 7, in <module>
    from dataclasses_configobj import core
ModuleNotFoundError: No module named 'dataclasses_configobj'

[hogegex]

I have the same problem.
It seems that the directories inside the workspace folder are not recognized as packages.
(PYTHONPATH problem?)

If write "import my_pkg" to test_foo.py of the following files, the test will not be detected.
If remove it, the test will be detected.

+ <workspaceFolder>
  + my_pkg
    - __init__.py
    - some.py
  + tests
    - test_foo.py

[karthiknadig]

Looks like the issue is with PYTHONPATH. essentially when we were running discovery using '-c' Python would add [''] to the front of sys.path, this meant that the CWD would be looked at while import resolution. But when we switched to using a script, it does not add [''], which cause the module not found error.

@brettcannon What do you recommend we do here? insert '' to sys.path in the unittest discovery script, OR is there a better way?

[helloybz]

I have the same problem.

Below is my unittest configures in .vscode/setting.json.

{
"python.testing.unittestArgs": [
        "-v",
        "-s",
        "./tests",
        "-p",
        "test_*.py"
    ]
}

And I've found that the start-directory "./test" becomes "/test" in discover::unittest.loader.TestLoader

Any idea about why the "./test" becomes "/test"??

[karthiknadig]

@helloybz Can you make sure that you are using latest python extension version: 2021.9.1218897484?
With the settings you mentioned above I am seeing this, I don't see it missing the .:

[brettcannon]

The cwd should still be the first entry in sys.path regardless of whether -m or -c was used.

# In site-packages named `sys_path`.
import sys

if __name__ == '__main__':
    print(sys.path)

❯ ./test-venv/bin/python -m sys_path
['/tmp', '/home/linuxbrew/.linuxbrew/opt/python@3.9/lib/python39.zip', '/home/linuxbrew/.linuxbrew/opt/python@3.9/lib/python3.9', '/home/linuxbrew/.linuxbrew/opt/python@3.9/lib/python3.9/lib-dynload', '/tmp/test-venv/lib/python3.9/site-packages']

[karthiknadig]

This is using script, so no -m or -c.

[tonycassara]

Hey @karthiknadig was there a resolution for this? I'm having the exact same issue, latest Python extension installed v2021.9.1246542782

[karthiknadig]

This particular issue is fixed. If you are seeing ModuleNotFoundError it can be for a variety of reasons. Please file a separate bug with details so we can investigate.

[LoicH]

I was having the same issue, stumbled upon this page, and for those who still have the same problem: don't forget to run pip install to have your requirements to run your tests 😉

[dlencer]

I still have this issue with 2021.9.1246542782. Manually, I can run the command that VS Code seems to execute, python ~/.vscode-server/extensions/ms-python.python-2021.9.1246542782/pythonFiles/testing_tools/unittest_discovery.py ./tests test_*.py inside my venv just fine, but VS Code does not find the tests.

[dlencer]

With today's update (VS Code 1.61, Python Extension v2021.10.1317843341), test discovery is working again. Thanks!