Update test workflow to use pytest-cov for coverage reporting

Author: Евгений Блинов

.github/workflows/tests_and_coverage.yml

@@ -62,14 +62,7 @@ jobs:
 
     - name: Run tests and show the branch coverage on the command line
       shell: bash
-      run: |
-        pth_file="$(python -c 'import sysconfig; print(sysconfig.get_path("purelib"))')/suby_coverage_process_startup.pth"
-        printf "import os; os.getenv('COVERAGE_PROCESS_START') and __import__('coverage').process_startup()\n" > "$pth_file"
-        coverage erase
-        COVERAGE_PROCESS_START="$PWD/pyproject.toml" coverage run -m pytest -n auto --cache-clear --assert=plain
-        coverage combine
-        coverage report -m --fail-under=100 --omit='*tests*'
-        coverage xml --omit='*tests*'
+      run: pytest --cov=suby --cov-branch --cov-report=term-missing --cov-report=xml:coverage.xml --cov-fail-under=100 -n auto --cache-clear --assert=plain
 
     - name: Upload coverage to Coveralls
       if: runner.os == 'Linux' && matrix.python-version == '3.13'

requirements_dev.txt

@@ -3,6 +3,7 @@ pytest-xdist==3.6.1; python_version < '3.9'
 pytest-xdist==3.8.0; python_version >= '3.9'
 coverage==7.6.1
 coverage-pyver-pragma==0.4.0
+pytest-cov==6.1.1
 build==1.2.2.post1
 mypy==1.14.1
 pytest-mypy-testing==0.1.3

tests/conftest.py

@@ -9,16 +9,6 @@
 _run_module = importlib.import_module('suby.run')
 
 
-def pytest_configure(config):
-    """Keep coverage enabled for xdist workers, but disable inheritance by child `run(... python -c ...)` subprocesses.
-
-    If this hook is removed, every short-lived Python subprocess spawned by the test suite will inherit
-    `COVERAGE_PROCESS_START`, import coverage from the `.pth` bootstrap, and the parallel coverage run will become
-    significantly slower again.
-    """
-    if hasattr(config, 'workerinput'):
-        os.environ.pop('COVERAGE_PROCESS_START', None)
-
 
 def pytest_ignore_collect(collection_path, config):
     """Skip typing-snippet tests in mutmut's copied test tree, because mutmut is a runtime mutation runner."""