run tests on mac and windows

Author: minrk

.github/workflows/test.yml

@@ -10,7 +10,7 @@ env:
 
 jobs:
   test:
-    runs-on: ubuntu-20.04
+    runs-on: ${{ matrix.runs_on || 'ubuntu-20.04' }}
     timeout-minutes: 10
 
     strategy:
@@ -22,12 +22,14 @@ jobs:
             ssh: ssh
           - python: "3.6"
             tornado: "5.1.1"
-          - python: "3.6"
           - python: "3.7"
             controller_ip: "*"
+          - python: "3.8"
+            runs_on: windows-2019
           - python: "3.8"
             mpi: mpi
           - python: "3.9"
+            runs_on: macos-10.15
 
     steps:
       - uses: actions/checkout@v2
@@ -74,9 +76,11 @@ jobs:
           pip install --upgrade pip
           pip install --pre --upgrade .[test] distributed joblib codecov
           pip install --only-binary :all: matplotlib || echo "no matplotlib"
-          if [ "${{ matrix.tornado }}" != "" ]; then
-            pip install tornado==${{ matrix.tornado }}
-          fi
+
+      - name: Install pinned tornado
+        if: matrix.tornado
+        run: |
+          pip install tornado==${{ matrix.tornado }}
 
       - name: Show environment
         run: pip freeze