Include codecov on GitHub Actions

.github/workflows/main.yml

@@ -24,24 +24,24 @@ jobs:
       fail-fast: false
       matrix:
         name: [
-          "windows-py35",
-          "windows-py36",
-          "windows-py37",
-          "windows-py37-pluggy",
-          "windows-py38",
+#          "windows-py35",
+#          "windows-py36",
+#          "windows-py37",
+#          "windows-py37-pluggy",
+#          "windows-py38",
 
-          "ubuntu-py35",
+#          "ubuntu-py35",
           "ubuntu-py36",
-          "ubuntu-py37",
-          "ubuntu-py37-pluggy",
-          "ubuntu-py37-freeze",
-          "ubuntu-py38",
-          "ubuntu-pypy3",
-
-          "macos-py37",
-          "macos-py38",
-
-          "linting",
+#          "ubuntu-py37",
+#          "ubuntu-py37-pluggy",
+#          "ubuntu-py37-freeze",
+#          "ubuntu-py38",
+#          "ubuntu-pypy3",
+#
+#          "macos-py37",
+#          "macos-py38",
+#
+#          "linting",
         ]
 
         include:
@@ -118,6 +118,22 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install tox
+        pip install tox coverage
     - name: Test
-      run: tox -e ${{ matrix.tox_env }}
+      env:
+        COVERAGE_PROCESS_START: ".coveragerc"
+        _PYTEST_TOX_COVERAGE_RUN: "coverage run -m"
+        _PYTEST_TOX_EXTRA_DEP: "coverage-enable-subprocess"
+      # testing\test_session.py is temporary
+      run: |
+        tox -e ${{ matrix.tox_env }} -- testing/test_session.py
+        python -m coverage combine
+        python -m coverage xml
+        python -m coverage report -m
+    - name: Codecov
+      uses: codecov/codecov-action@v1
+      with:
+        token: ${{ secrets.codecov }}
+        file: ./coverage.xml
+        flags: ${{ runner.os }}
+        fail_ci_if_error: true