auto(agent): enhance contacts test coverage with zod validation tests

backend/src/__tests__/contacts.test.js

@@ -106,4 +106,26 @@ test('POST /contacts/respond should handle valid response data', async () => {
 
   // This test will fail if the route is not properly implemented or if there's no valid request in test context
   assert.strictEqual(response.statusCode, 404); // Expected since we don't have a real request in test context
+});
+
+// Test for contacts request endpoint with proper validation
+test('POST /contacts/request should validate dealId and targetUserId (zod)', async () => {
+  const response = await app.inject({
+    method: 'POST',
+    url: '/contacts/request',
+    payload: { dealId: 'not-a-number', targetUserId: 2 }
+  });
+
+  assert.strictEqual(response.statusCode, 400);
+});
+
+// Test for contacts respond endpoint with proper validation
+test('POST /contacts/respond should validate requestId and accept (zod)', async () => {
+  const response = await app.inject({
+    method: 'POST',
+    url: '/contacts/respond',
+    payload: { requestId: 'not-a-number', accept: true }
+  });
+
+  assert.strictEqual(response.statusCode, 400);
 });