Run tests on MacOS and Windows too

.github/workflows/tests.yml

@@ -3,20 +3,30 @@ name: Tests
 on:
   push:
     branches:
-    - master
+      - master
   pull_request:
 
 jobs:
   tests:
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}-latest
     strategy:
       fail-fast: false
       matrix:
+        os:
+          - macos
+          - windows
+          - ubuntu
         python-version:
-        - 3.6
-        - 3.7
-        - 3.8
-        - 3.9
+          - 3.6
+          - 3.7
+          - 3.8
+          - 3.9
+        exclude:
+          # Jobs fail on Windows if there's no wheel for twisted
+          - os: windows
+            python-version: 3.8
+          - os: windows
+            python-version: 3.9
 
     steps:
       - uses: actions/checkout@v2
@@ -26,11 +36,14 @@ jobs:
           python-version: ${{ matrix.python-version }}
       - name: Install dependencies
         run: |
-          python -m pip install --upgrade pip wheel setuptools tox
-      - name: Run tox targets for ${{ matrix.python-version }}
+          python -m pip install --upgrade pip wheel setuptools tox tox-factor
+      - name: Set pyversion for tox
         run: |
-          ENV_PREFIX=$(tr -C -d "0-9" <<< "${{ matrix.python-version }}")
-          TOXENV=$(tox --listenvs | grep "^py$ENV_PREFIX" | tr '\n' ',') python -m tox
+          python -c "import sys; print('::set-output name=PYV::', ''.join([str(x) for x in sys.version_info[:2]]), sep='')"
+        id: pyversion
+      - name: Run tox targets for Python ${{ matrix.python-version }} on ${{ matrix.os }}
+        run: |
+          python -m tox -f py${{ steps.pyversion.outputs.PYV }}-${{ matrix.os }}
 
   lint:
     runs-on: ubuntu-latest

tox.ini

@@ -1,6 +1,7 @@
 [tox]
 envlist =
-    py{36,37,38,39}-twisted{187,latest}
+    py{36,37,38,39}-twisted{187,latest}-{ubuntu,macos}
+    py{36,37}-twistedlatest-windows
     qa
 
 [testenv]