add macos to CI

Author: ylecuyer

.github/workflows/test.yml

@@ -3,26 +3,28 @@ name: Test
 on: [push, pull_request]
 
 jobs:
+
   build:
-    name: on ruby ${{matrix.ruby}}
-    runs-on: ubuntu-latest
+    name: on ${{ matrix.os }} ruby ${{ matrix.ruby }}
+    runs-on: ${{ matrix.os }}
 
     strategy:
       fail-fast: false
       matrix:
+        os: [ubuntu-latest, macos-latest]
         ruby: [2.6, 2.7, '3.0', 3.1, 3.2, 3.3, 3.4, head]
 
     steps:
-    - name: Checkout repository
-      uses: actions/checkout@v2
+      - name: Checkout repository
+        uses: actions/checkout@v2
 
-    - name: Set up Ruby
-      uses: ruby/setup-ruby@v1
-      with:
-        ruby-version: ${{matrix.ruby}}
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
 
-    - name: Install dependencies
-      run: bundle install --jobs 4 --retry 3
+      - name: Install dependencies
+        run: bundle install --jobs 4 --retry 3
 
-    - name: Specs
-      run: bundle exec rspec
+      - name: Specs
+        run: bundle exec rspec