test: 更新 AgentScope 相关单元测试与集成测试

- 重命名 test_react_runner.py 为 test_runner.py
- 新增 test_utils.py 测试工具函数
- 更新现有测试用例适配新架构

backend/tests/unit/core/agentscope/schemas/test_agui_input.py

@@ -126,3 +126,34 @@ def test_validate_run_request_messages_contract_rejects_binary_data_block() -> N
 
     with pytest.raises(ValueError, match="binary content requires url"):
         validate_run_request_messages_contract(run_input)
+
+
+def test_parse_run_input_accepts_snake_case_aliases() -> None:
+    payload = {
+        "thread_id": "00000000-0000-0000-0000-000000000001",
+        "run_id": "run-1",
+        "state": {},
+        "messages": [
+            {
+                "id": "u1",
+                "role": "user",
+                "content": [
+                    {"type": "text", "text": "hello"},
+                    {
+                        "type": "binary",
+                        "mime_type": "image/png",
+                        "url": "https://signed.example/a.png",
+                    },
+                ],
+            }
+        ],
+        "tools": [],
+        "context": [],
+        "forwarded_props": {},
+    }
+
+    run_input = parse_run_input(payload)
+
+    assert run_input.thread_id == "00000000-0000-0000-0000-000000000001"
+    assert run_input.run_id == "run-1"
+    validate_run_request_messages_contract(run_input)