Tests: cover wrapper.run_python_file function which invokes scripts

Bug: T401124
Change-Id: Id185d988069e533ef60b47eee3fcf6f96ec88bb8

Author: xqt

.github/workflows/pywikibot-ci.yml

@@ -130,6 +130,7 @@ jobs:
         continue-on-error: true
         timeout-minutes: 90
         env:
+          COVERAGE_PROCESS_START: pyproject.toml
           PYWIKIBOT_TEST_NO_RC: ${{ (matrix.site == 'wikisource:zh' || matrix.test_no_rc) && 1 || 0 }}
         run: |
           python pwb.py version

pywikibot/scripts/wrapper.py

@@ -125,6 +125,14 @@ def run_python_file(filename: str, args: list[str], package=None) -> None:
     :param package: The package of the script. Used for checks.
     :type package: Optional[module]
     """
+    if os.environ.get('PYWIKIBOT_TEST_RUNNING', '0') == '1':
+        try:
+            import coverage
+        except ModuleNotFoundError:
+            pass
+        else:
+            coverage.process_startup()
+
     # Create a module to serve as __main__
     old_main_mod = sys.modules['__main__']
     main_mod = types.ModuleType('__main__')