add test actions

Author: MattKiazyk

.github/workflows/test.yml

@@ -0,0 +1,20 @@
+name: Tests
+
+on:
+  push:
+    branches:
+      - "**"
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  test:
+    runs-on: macos-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Run tests
+        run: swift test