adds unit tests workflow

Author: matthew fong

.github/workflows/test.yml

@@ -0,0 +1,34 @@
+on: [push]
+
+name: Test
+
+jobs:
+  run:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@master
+
+      - name: Set up Ruby
+        uses: actions/setup-ruby@v1
+        with:
+          ruby-version: '2.7.x'
+          bundler-cache: true
+
+      - name: Cache bundled gems
+        uses: actions/cache@v2
+        with:
+          path: vendor/bundle
+          key: ${{ runner.os }}-gems-${{ hashFiles('Gemfile.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-gems-
+
+      - name: Install Ruby gems
+        run: |
+          bundle config path vendor/bundle
+          bundle install
+
+      - name: Run Rspec
+        run: |
+          bundle exec rspec