tests: add basic tests for utilities

.github/workflows/ci.yml

@@ -0,0 +1,23 @@
+name: Tinyauth CI
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: "^1.23.2"
+
+      - name: Run tests
+        run: go test -v ./...