Skip pytest-cov in setup.cfg for PyPy

Instead of disabling coverage in the GitHub workflow
it might be easier to just not install it in the test environment.

Author: abravalheri

.github/workflows/main.yml

@@ -38,11 +38,6 @@ jobs:
       - name: Install tox
         run: |
           python -m pip install tox
-      - name: Disable coverage on PyPy
-        # Coverage seems to slow things down on PyPy (ubuntu is still OK-ish)
-        if: contains(matrix.python, 'pypy') && matrix.platform != 'ubuntu-latest'
-        shell: bash
-        run: echo 'PYTEST_ADDOPTS=-p no:cov' >> $GITHUB_ENV
       - name: Run tests
         run: tox -- --cov-report xml
       - name: Publish coverage

setup.cfg

@@ -46,7 +46,9 @@ testing =
 	pytest-black >= 0.3.7; \
 		# workaround for jaraco/skeleton#22
 		python_implementation != "PyPy"
-	pytest-cov
+	pytest-cov; \
+		# coverage seems to make PyPy extremely slow
+		python_implementation != "PyPy"
 	pytest-mypy >= 0.9.1; \
 		# workaround for jaraco/skeleton#22
 		python_implementation != "PyPy"