add some more ci trappings

Author: bollwyvl

.github/workflows/main.yml

@@ -6,12 +6,12 @@ on:
     branches: '*'
 jobs:
   build:
-    runs-on: ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}-latest
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: [ '3.6', '3.7', '3.8' ]
+        os: [ubuntu, macos, windows]
+        python-version: [ '3.6', '3.7', '3.8', '3.9', 'pypy3' ]
     steps:
     - name: Checkout
       uses: actions/checkout@v1
@@ -20,9 +20,28 @@ jobs:
       with:
         python-version: ${{ matrix.python-version }}
         architecture: 'x64'
+    - name: Upgrade packaging dependencies
+      run: |
+        pip install --upgrade pip setuptools wheel
+    - name: Get pip cache dir
+      id: pip-cache
+      run: |
+        echo "::set-output name=dir::$(pip cache dir)"
+    - name: Cache pip
+      uses: actions/cache@v1
+      with:
+        path: ${{ steps.pip-cache.outputs.dir }}
+        key: ${{ runner.os }}-pip-${{ matrix.python-version }}-${{ hashFiles('setup.py') }}
+        restore-keys: |
+          ${{ runner.os }}-pip-${{ matrix.python-version }}-
+          ${{ runner.os }}-pip-
     - name: Install the Python dependencies
       run: |
-        pip install -e .[test]
+        pip install -e .[test] codecov
+    - name: List installed packages
+      run: |
+        pip freeze
+        pip check
     - name: Run the tests
       run: |
         pytest
@@ -32,3 +51,6 @@ jobs:
     - name: Run the tests for the examples
       run: |
         pytest examples/simple/tests/test_handlers.py
+    - name: Coverage
+      run: |
+        codecov