add tests

Author: atomikpanda

.claude/settings.local.json

@@ -1,7 +1,9 @@
 {
   "permissions": {
     "allow": [
-      "Bash(go mod:*)"
+      "Bash(go mod:*)",
+      "Bash(go test:*)",
+      "Bash(go tool:*)"
     ]
   }
 }

.github/workflows/test.yml

@@ -0,0 +1,44 @@
+name: Tests
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        go-version: ['1.22', '1.23']
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: ${{ matrix.go-version }}
+
+      - name: Download dependencies
+        run: go mod download
+
+      - name: Build
+        run: go build ./...
+
+      - name: Run tests
+        run: go test -race -coverprofile=coverage.out -covermode=atomic ./...
+
+      - name: Check coverage
+        run: |
+          total=$(go tool cover -func=coverage.out | grep total | awk '{print $3}' | sed 's/%//')
+          echo "Total coverage: ${total}%"
+          threshold=80
+          if [ "$(echo "$total < $threshold" | bc -l)" -eq 1 ]; then
+            echo "::error::Coverage ${total}% is below ${threshold}% threshold"
+            exit 1
+          fi
+
+      - name: Vet
+        run: go vet ./...