add testing suite

vitest.integration.config.js

@@ -0,0 +1,10 @@
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  test: {
+    include: ["test/integration/**/*.test.js"],
+    exclude: ["**/node_modules/**"],
+    environment: "node",
+    testTimeout: 120000,
+  },
+});