Check code coverage during CI workflow run

Author: per1234

.github/workflows/libraries_report-size-deltas.yml

@@ -35,7 +35,14 @@ jobs:
           pip install --quiet pep8-naming
           flake8 --config "$GITHUB_WORKSPACE/libraries/report-size-deltas/.flake8" --show-source "$GITHUB_WORKSPACE/libraries/report-size-deltas"
 
-      - name: Run Python unit tests
+      - name: Run Python unit tests and report code coverage
         run: |
           export PYTHONPATH="$GITHUB_WORKSPACE/libraries/report-size-deltas"
-          pytest "$GITHUB_WORKSPACE/libraries/report-size-deltas/tests"
+          coverage run --source="$GITHUB_WORKSPACE/libraries/report-size-deltas" --module pytest "$GITHUB_WORKSPACE/libraries/report-size-deltas/tests"
+          # Display code coverage report in workflow run log
+          coverage report
+
+      - name: Upload coverage report to Codecov
+        uses: codecov/codecov-action@v1
+        with:
+          fail_ci_if_error: true

codecov.yml

@@ -0,0 +1,6 @@
+coverage:
+  range: "100...100"
+  status:
+    project:
+      default:
+        threshold: 0%

tests/requirements.txt

@@ -1,2 +1,3 @@
+coverage==5.2.1
 pytest==5.4.2
 pytest-mock==3.1.0