more unit testing

vitest.config.integration.ts

@@ -16,12 +16,12 @@ export default defineConfig({
     // "singleThread: true" is removed in modern Vitest.
     // 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,
+    coverage: {
+      provider: 'v8',
+      // Add 'json' for merging and output to a temporary directory
+      reporter: ['text', 'html', 'json'],
+      reportsDirectory: './.coverage/integration',
+      clean: true,
+    },
   },
 });