report.py Tries to parse non-existent files

[adam-grant-hendry]

Summary

After uninstalling PyQt5 and installing PySide6 in my virtual environment (using poetry add/remove), coverage reports warnings that it cannot parse some non-existent files. It is looking for site-packages pyscript, shibokensupport, and signature_bootstrap.py as if they are in my local folder, when they are actually in my .venv/Lib/site-packages folder:

%userprofile%\code\myproj\.venv\lib\site-packages\coverage\report.py:87: CoverageWarning: Couldn't parse '%userprofile%\Code\myproj\pyscript': No source for code: '%userprofile%\Code\myproj\pyscript'. (couldnt-parse)
  coverage._warn(msg, slug="couldnt-parse")
%userprofile%\code\myproj\.venv\lib\site-packages\coverage\report.py:87: CoverageWarning: Couldn't parse '%userprofile%\Code\myproj\shibokensupport\__init__.py': No source for 
code: '%userprofile%\Code\myproj\shibokensupport\__init__.py'. (couldnt-parse)
  coverage._warn(msg, slug="couldnt-parse")
%userprofile%\code\myproj\.venv\lib\site-packages\coverage\report.py:87: CoverageWarning: Couldn't parse '%userprofile%\Code\myproj\shibokensupport\feature.py': No source for code: '%userprofile%\Code\myproj\shibokensupport\feature.py'. (couldnt-parse)
  coverage._warn(msg, slug="couldnt-parse")
%userprofile%\code\myproj\.venv\lib\site-packages\coverage\report.py:87: CoverageWarning: Couldn't parse '%userprofile%\Code\myproj\shibokensupport\signature\__init__.py': No source for code: '%userprofile%\Code\myproj\shibokensupport\signature\__init__.py'. (couldnt-parse)
  coverage._warn(msg, slug="couldnt-parse")
%userprofile%\code\myproj\.venv\lib\site-packages\coverage\report.py:87: CoverageWarning: Couldn't parse '%userprofile%\Code\myproj\shibokensupport\signature\errorhandler.py': 
No source for code: '%userprofile%\Code\myproj\shibokensupport\signature\errorhandler.py'. (couldnt-parse)
  coverage._warn(msg, slug="couldnt-parse")
%userprofile%\code\myproj\.venv\lib\site-packages\coverage\report.py:87: CoverageWarning: Couldn't parse '%userprofile%\Code\myproj\shibokensupport\signature\importhandler.py': No source for code: '%userprofile%\Code\myproj\shibokensupport\signature\importhandler.py'. (couldnt-parse)
  coverage._warn(msg, slug="couldnt-parse")
%userprofile%\code\myproj\.venv\lib\site-packages\coverage\report.py:87: CoverageWarning: Couldn't parse '%userprofile%\Code\myproj\shibokensupport\signature\layout.py': No source for code: '%userprofile%\Code\myproj\shibokensupport\signature\layout.py'. (couldnt-parse)
  coverage._warn(msg, slug="couldnt-parse")
%userprofile%\code\myproj\.venv\lib\site-packages\coverage\report.py:87: CoverageWarning: Couldn't parse '%userprofile%\Code\myproj\shibokensupport\signature\lib\__init__.py': 
No source for code: '%userprofile%\Code\myproj\shibokensupport\signature\lib\__init__.py'. (couldnt-parse)
  coverage._warn(msg, slug="couldnt-parse")
%userprofile%\code\myproj\.venv\lib\site-packages\coverage\report.py:87: CoverageWarning: Couldn't parse '%userprofile%\Code\myproj\shibokensupport\signature\lib\enum_sig.py': 
No source for code: '%userprofile%\Code\myproj\shibokensupport\signature\lib\enum_sig.py'. (couldnt-parse)
  coverage._warn(msg, slug="couldnt-parse")
%userprofile%\code\myproj\.venv\lib\site-packages\coverage\report.py:87: CoverageWarning: Couldn't parse '%userprofile%\Code\myproj\shibokensupport\signature\lib\pyi_generator.py': No source for code: '%userprofile%\Code\myproj\shibokensupport\signature\lib\pyi_generator.py'. (couldnt-parse)
  coverage._warn(msg, slug="couldnt-parse")
%userprofile%\code\myproj\.venv\lib\site-packages\coverage\report.py:87: CoverageWarning: Couldn't parse '%userprofile%\Code\myproj\shibokensupport\signature\lib\tool.py': No source for code: '%userprofile%\Code\myproj\shibokensupport\signature\lib\tool.py'. (couldnt-parse)
  coverage._warn(msg, slug="couldnt-parse")
%userprofile%\code\myproj\.venv\lib\site-packages\coverage\report.py:87: CoverageWarning: Couldn't parse '%userprofile%\Code\myproj\shibokensupport\signature\loader.py': No source for code: '%userprofile%\Code\myproj\shibokensupport\signature\loader.py'. (couldnt-parse)
  coverage._warn(msg, slug="couldnt-parse")
%userprofile%\code\myproj\.venv\lib\site-packages\coverage\report.py:87: CoverageWarning: Couldn't parse '%userprofile%\Code\myproj\shibokensupport\signature\mapping.py': No source for code: '%userprofile%\Code\myproj\shibokensupport\signature\mapping.py'. (couldnt-parse)
  coverage._warn(msg, slug="couldnt-parse")
%userprofile%\code\myproj\.venv\lib\site-packages\coverage\report.py:87: CoverageWarning: Couldn't parse '%userprofile%\Code\myproj\shibokensupport\signature\parser.py': No source for code: '%userprofile%\Code\myproj\shibokensupport\signature\parser.py'. (couldnt-parse)
  coverage._warn(msg, slug="couldnt-parse")
%userprofile%\code\myproj\.venv\lib\site-packages\coverage\report.py:87: CoverageWarning: Couldn't parse '%userprofile%\Code\myproj\signature_bootstrap.py': No source for code: '%userprofile%\Code\myproj\signature_bootstrap.py'. (couldnt-parse)
  coverage._warn(msg, slug="couldnt-parse")

Expected vs actual result

Expect coverage not to search for non-existent files and to not warn.

Reproducer

1. Create and activate a virtual environment

   PS> py -m venv .venv
   PS> .venv/Scripts/Activate.ps1

   and ensure vscode sees the Python Interpreter (use Ctrl+Shift+p and set).

2. Create a new poetry project

   PS> poetry init

3. Install pytest, pytest-cov, pytest-env, pytest-qt, pyqt5, and qtpy

   PS> poetry add pytest pytest-cov pytest-qt pyqt5 qtpy

4. Update the pyproject.toml and then run poetry install to make a local (editable) install

   [tool.poetry]
   name = "coverage-issue-1392"
   version = "0.1.0"
   description = ""
   authors = ["Hendry, Adam <adam.grant.hendry@gmail.com>"]
   packages = [
       {include = "myproj"},
       {include = "tests"}
   ]
   
   [tool.poetry.dependencies]
   PyQt5 = "^5.15.6"
   pytest = "^7.1.2"
   pytest-cov = "^3.0.0"
   pytest-env = "^0.6.2"
   pytest-qt = "^4.0.2"
   python = "3.8"
   QtPy = "^2.1.0"
   
   [tool.poetry.dev-dependencies]
   
   [build-system]
   requires = ["poetry-core>=1.0.0"]
   build-backend = "poetry.core.masonry.api"
   
   [tool.pytest.ini_options]
   minversion = "7.0"
   addopts = """\
   --last-failed --last-failed-no-failures all \
   -p no:faulthandler \
   --import-mode=importlib \
   --cov \
   --cov-report term-missing \
   --cov-report html \
   --cov-report xml \
   """
   testpaths = [
       "tests",
   ]
   qt_api = "pyqt5"
   env = [
       "D:COVERAGE_DEBUG=trace",
       "D:COVERAGE_DEBUG_FILE=debug_log.txt"
   ]

5. Create a dummy Qt project

   myproj/main.py

   from qtpy import QtWidgets
   
   
   class MainApp(QtWidgets.QMainWindow):
       """The main window."""
   
   if __name__ == '__main__':
       app = QtWidgets.QApplication([])
       window = MainApp()
       window.show()
       app.exec_()

6. Create a dummy test

   test/test_window.py

   import pytest
   from myproj.main import MainApp
   
   
   @pytest.fixture(name='app', scope='function')
   def fixture_app(qtbot):
       window = MainApp()
       window.show()
   
       qtbot.addWidget(window)
   
       yield window
   
   def test_window_appears(app) -> None:
       assert app.isVisible()

7. Run pytest

   PS> pytest

8. Add pyside6 and remove pyqt5

      PS> poetry add pyside6
      PS> poetry remove pyqt5

   NOTE: Before doing this, be sure to set python exactly to 3.8 in the pyproject.toml:

   python = "3.8"

9. Change qt_api in pyproject.toml:

   [tool.pytest.ini_options]
   qt_api = "pyside6"

10. Update project with new toml

    PS> poetry update

11. Re-run pytest

    PS> pytest

This generates the error messages mentioned.

Versions

OS: Windows 10
Python: 3.8.10
VSCode: 1.67.2

Config

N/A (see Reproducer)

Code

N/A (see Reproducer)

[nedbat]

You already wrote a bug against coverage.py (nedbat/coveragepy#1392), why write this one here?

[nedbat]

Sorry, maybe it's not clear: pytest-cov is a plugin that uses coverage.py as its engine. This bug is a duplicate.

[adam-grant-hendry]

@nedbat I wrote this here in the event the coveragepy maintainers would tell me to open an issue on pytest-cov instead. Thank you for closing.