Add codecov GitHub Action (#355)

Author: Mariatta

.github/workflows/workflow.yml

@@ -0,0 +1,30 @@
+name: Codecov
+on: [push]
+jobs:
+  run:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+    env:
+      OS: ${{ matrix.os }}
+      PYTHON: '3.7'
+    steps:
+    - uses: actions/checkout@master
+    - name: Setup Python
+      uses: actions/setup-python@master
+      with:
+        python-version: 3.7
+    - name: Generate coverage report
+      run: |
+        python3 -m pip install -U -r dev-requirements.txt
+        pytest --cov=tests/ --cov-report=xml
+    - name: Upload coverage to Codecov
+      uses: codecov/codecov-action@v1
+      with:
+        token: ${{ secrets.CODECOV_TOKEN }}
+        file: ./coverage.xml
+        flags: unittests
+        env_vars: OS,PYTHON
+        name: codecov-umbrella
+        fail_ci_if_error: true

codecov.yml

@@ -0,0 +1,20 @@
+codecov:
+  require_ci_to_pass: yes
+
+coverage:
+  precision: 2
+  round: down
+  range: "70...100"
+
+parsers:
+  gcov:
+    branch_detection:
+      conditional: yes
+      loop: yes
+      method: no
+      macro: no
+
+comment:
+  layout: "reach,diff,flags,tree"
+  behavior: default
+  require_changes: no

dev-requirements.txt

@@ -3,3 +3,5 @@ coverage
 pytest==5.4.3
 pytest-asyncio==0.14.0
 pytest-aiohttp==0.3.0
+pytest-cov==2.10.0
+codecov==2.1.7