cannot find unittest in files that contains . in its file name

[shelper]

Type: Bug

Behaviour

Cannot find unittests in files with . in it's file name

Expected vs. Actual

Expected: find tests in file named like "foo.test.py"
Actual: fail to find tests, but if change to "foo_test.py", then everything works

Steps to reproduce:

1. create a project for python, put some tests in the project_root/tests folder called "example_test.py"
2. configure the settings for python unittest like

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

3. all the tests in the tests panel show up normally
4. now, change file name example_test.py to example.test.py and the settings above to "*.test.py", all tests are gone.
5. also tried "*\.test.py", but no luck

• Python version (& distribution if applicable, e.g. Anaconda): 3.10.10
• Type of virtual environment used (e.g. conda, venv, virtualenv, etc.): Poetry
• Value of the python.languageServer setting: Pylance

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

XXX

User Settings

languageServer: "Pylance"

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

Extension version: 2023.22.1
VS Code version: Code 1.85.1 (0ee08df0cf4527e40edc9aa28f4b5bd38bbff2b2, 2023-12-13T09:49:37.021Z)
OS version: Windows_NT x64 10.0.19045
Modes:
Remote OS version: Linux x64 5.15.137.3-microsoft-standard-WSL2

[shelper]

I dont know if this is a bug for vscode or vscode-python, so i filed issue also at microsoft/vscode#202280
will close the wrong one if figured out.

[karthiknadig]

@shelper Files with "." in the name can't be used with python directly. "." causes python to treat things like submodules. This has nothing to do with python extension. unittest itself will not be able to load these files. Typically, in python you prefix/suffix files with test_ or _test. This is why it works with "_" and not with ".".