Add test github action

.github/workflows/test.yml

@@ -0,0 +1,30 @@
+name: Unit Test
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    name: Test with ${{ matrix.ruby }}
+    strategy:
+      matrix:
+        # Find the versions available at https://github.com/ruby/setup-ruby/blob/master/ruby-builder-versions.json
+        ruby:
+          - '3.3.1'
+          - '3.2.4'
+          - '3.1.5'
+          - '3.0.6'
+          - '2.7.8'
+          - '2.6.10'
+          - '2.5.9'
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+          bundler-cache: true
+      - name: Run the test
+        run: bundle exec rake test