Add Codecov (#7)

* Add Codecov

* Add .coveragerc

Author: kotarot

.coveragerc

@@ -0,0 +1,5 @@
+[run]
+omit =
+    example/*
+    tests/*
+    setup.py

.github/workflows/ci.yaml

@@ -55,8 +55,16 @@ jobs:
     - name: List installed packages
       run: pip list
     - name: Run unit tests
-      run: |
-        pytest --verbose
+      run: pytest --verbose --cov=./ --cov-report=xml
+    - name: Upload coverage reports to Codecov
+      if: matrix.os == 'ubuntu-latest' && matrix.python-version == '3.9'
+      uses: codecov/codecov-action@v1
+      with:
+        file: ./coverage.xml
+        flags: unittests
+        env_vars: OS,PYTHON
+        name: codecov-umbrella
+        fail_ci_if_error: true
 
   examples:
     name: 'Run examples'

setup.py

@@ -45,6 +45,7 @@
         "dev": [
             # For test
             "pytest>=6.2.4,<7.0.0",
+            "pytest-cov>=2.11.1,<3.0.0",
             # For lint
             "black>=21.5b0,<22.0",
             "flake8>=3.9.1,<4.0.0",