Attempt to add coverage.py to testing workflow.

.github/workflows/python-package.yml

@@ -1,7 +1,7 @@
 # This workflow will install Python dependencies, run tests and lint with a variety of Python versions
 # For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions
 
-name: Python package
+name: Test coverage
 
 on:
   push:
@@ -27,6 +27,7 @@ jobs:
       run: |
         python -m pip install --upgrade pip setuptools wheel
         pip install flake8 pytest
+        pip install coverage
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
     - name: Lint with flake8
       run: |
@@ -36,5 +37,5 @@ jobs:
         flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
     - name: Test with pytest
       run: |
-        pip install pytest
-        python -m pytest
+        coverage run -m pytest
+        coverage report -m