run tests on all OSes

.github/workflows/test.yml

@@ -4,17 +4,23 @@ on: [push, pull_request]
 
 jobs:
   test:
-    name: Node ${{ matrix.node }}
-    runs-on: ubuntu-latest
     strategy:
-      fail-fast: false
       matrix:
-        node: [12, 10]
+        os: [ubuntu-latest, windows-latest, macOS-latest]
+        node: [13.x, 12.x, 10.x, 8.x]
+      fail-fast: false
+    runs-on: ${{ matrix.os }}
+    name: Node ${{ matrix.node }} on ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v2
     - uses: actions/setup-node@v1
       with:
         node-version: ${{ matrix.node }}
-    - run: npm ci
-    - run: node cli.js env
-    - run: npm test
+    - name: npm install and test
+      run: |
+        npm ci
+        npm test
+      env:
+        CI: true
+    - name: Check Hugo version
+      run: node cli.js env