test different os

.github/workflows/tests.yml

@@ -0,0 +1,47 @@
+name: tests
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+  workflow_dispatch:
+
+jobs:
+  build:
+    strategy:
+      # We want to see all failures:
+      fail-fast: false
+      matrix:
+        os:
+        - ["ubuntu", "ubuntu-20.04"]
+        - ["windows", "windows-latest"]
+        - ["macos", "macos-11"]
+        config:
+        # [Python version, tox env]
+        - ["3.9",   "test"]
+
+    runs-on: ${{ matrix.os[1] }}
+    name: ${{ matrix.os[0] }}-${{ matrix.config[1] }}
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up Python
+      uses: actions/setup-python@v4
+      with:
+        python-version: ${{ matrix.config[0] }}
+    - name: Pip cache
+      uses: actions/cache@v3
+      with:
+        path: ~/.cache/pip
+        key: ${{ runner.os }}-pip-${{ matrix.config[0] }}-${{ hashFiles('setup.*', 'tox.ini') }}
+        restore-keys: |
+          ${{ runner.os }}-pip-${{ matrix.config[0] }}-
+          ${{ runner.os }}-pip-
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install tox
+    - name: Test
+      run: tox -e ${{ matrix.config[1] }}