more unit testing

vitest.config.integration.ts

@@ -17,4 +17,11 @@ export default defineConfig({
     // Use fileParallelism: false to ensure test files run one by one to prevent port conflicts.
     fileParallelism: false,
   },
+  coverage: {
+    provider: 'v8',
+    // Add 'json' for merging and output to a temporary directory
+    reporter: ['text', 'html', 'json'],
+    reportsDirectory: './.coverage/integration',
+    clean: true,
+  },
 });