feat: query all process nodes for business_object

stateflow/tests/test_business_object_api.py

@@ -652,3 +652,39 @@ class BusinessObjectAPITestCase(TestCase):
         self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
         self.assertFalse(response.data['success'])
         self.assertIn('流程没有任何节点', response.data['message'])
+    
+    def test_get_process_nodes(self):
+        """测试获取业务对象所属流程的所有状态节点 API"""
+        response = self.client.get(
+            f'/api/v1/stateflow/business-objects/{self.business_object.id}/process-nodes/'
+        )
+        
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertIn('count', response.data)
+        self.assertIn('nodes', response.data)
+        
+        # 验证节点数量
+        self.assertEqual(response.data['count'], 3)
+        self.assertEqual(len(response.data['nodes']), 3)
+        
+        # 验证节点内容和顺序
+        nodes = response.data['nodes']
+        
+        self.assertEqual(nodes[0]['state_id'], self.state1.id)
+        self.assertEqual(nodes[0]['state_name'], self.state1.name)
+        self.assertEqual(nodes[0]['order'], 0)
+        
+        self.assertEqual(nodes[1]['state_id'], self.state2.id)
+        self.assertEqual(nodes[1]['state_name'], self.state2.name)
+        self.assertEqual(nodes[1]['order'], 1)
+        
+        self.assertEqual(nodes[2]['state_id'], self.state3.id)
+        self.assertEqual(nodes[2]['state_name'], self.state3.name)
+        self.assertEqual(nodes[2]['order'], 2)
+        
+        # 验证每个节点都有必要的字段
+        for node in nodes:
+            self.assertIn('id', node)
+            self.assertIn('state_id', node)
+            self.assertIn('state_name', node)
+            self.assertIn('order', node)