clean: after all tests and fix them.

stateflow/test_api.py

@@ -476,10 +476,17 @@ class BusinessObjectNewAPITestCase(TestCase):
         models.ProcessNode.objects.create(process=self.process, state=self.state2, order=1)
         models.ProcessNode.objects.create(process=self.process, state=self.state3, order=2)
         
-        # 创建业务对象
+        # 创建关联对象（使用 State 作为示例，因为它是 stateflow 模块内的模型）
+        from django.contrib.contenttypes.models import ContentType
+        self.linked_object = models.State.objects.create(name='关联对象')
+        content_type = ContentType.objects.get_for_model(self.linked_object)
+        
+        # 创建业务对象并绑定关联对象
         self.business_object = models.BusinessObject.objects.create(
             name='测试业务对象',
-            process=self.process
+            process=self.process,
+            content_type=content_type,
+            object_id=self.linked_object.id
         )
     
     def test_next_pending_state_api(self):
@@ -502,18 +509,22 @@ class BusinessObjectNewAPITestCase(TestCase):
         self.assertNotIn('parameters', response.data)
         
         # 推进一步（提供必填参数）
-        self.client.post(
+        advance_response = self.client.post(
             f'/api/v1/stateflow/business-objects/{self.business_object.id}/advance/',
             {'parameters': {'param1': 'test_value'}},
             format='json'
         )
+        # 确保推进成功
+        self.assertEqual(advance_response.status_code, status.HTTP_200_OK, 
+                        f"Advance failed: {advance_response.data}")
         
         # 应返回第二个节点
         response = self.client.get(
             f'/api/v1/stateflow/business-objects/{self.business_object.id}/next_pending_state/'
         )
         self.assertEqual(response.status_code, status.HTTP_200_OK)
-        self.assertEqual(response.data['state']['id'], self.state2.id)
+        self.assertEqual(response.data['state']['id'], self.state2.id,
+                        f"Expected state2 (id={self.state2.id}), got {response.data['state']['id']}")
         
         # 完成所有节点
         self.client.post(f'/api/v1/stateflow/business-objects/{self.business_object.id}/advance/')