diff --git a/metagpt/tools/sd_engine.py b/metagpt/tools/sd_engine.py
index de2988d2a..ba61fd496 100644
--- a/metagpt/tools/sd_engine.py
+++ b/metagpt/tools/sd_engine.py
@@ -3,11 +3,11 @@
 # @Author  : stellahong (stellahong@deepwisdom.ai)
 # @Desc    :
 import base64
+import hashlib
 import io
 import json
 from os.path import join
 from typing import List
-import hashlib
 
 import requests
 from aiohttp import ClientSession
@@ -59,14 +59,14 @@ class SDEngine:
         # Define default payload settings for SD API
         self.payload = payload
         logger.info(self.sd_t2i_url)
-    
+
     def construct_payload(
-            self,
-            prompt,
-            negtive_prompt=default_negative_prompt,
-            width=512,
-            height=512,
-            sd_model="galaxytimemachinesGTM_photoV20",
+        self,
+        prompt,
+        negtive_prompt=default_negative_prompt,
+        width=512,
+        height=512,
+        sd_model="galaxytimemachinesGTM_photoV20",
     ):
         # Configure the payload with provided inputs
         self.payload["prompt"] = prompt
@@ -76,24 +76,24 @@ class SDEngine:
         self.payload["override_settings"]["sd_model_checkpoint"] = sd_model
         logger.info(f"call sd payload is {self.payload}")
         return self.payload
-    
+
     def save(self, imgs, save_name=""):
         save_dir = CONFIG.workspace_path / SD_OUTPUT_FILE_REPO
         if not save_dir.exists():
             save_dir.mkdir(parents=True, exist_ok=True)
         batch_decode_base64_to_image(imgs, str(save_dir), save_name=save_name)
-    
+
     def simple_run_t2i(self, payload: dict, auto_save: bool = True):
         with requests.Session() as session:
             logger.debug(self.sd_t2i_url)
             rsp = session.post(self.sd_t2i_url, json=payload, timeout=600)
-        
+
         results = rsp.json()["images"]
         if auto_save:
             save_name = hashlib.sha256(payload["prompt"][:10].encode()).hexdigest()[:6]
             self.save(results, save_name=f"output_{save_name}")
         return results
-    
+
     async def run_t2i(self, payloads: List):
         # Asynchronously run the SD API for multiple prompts
         session = ClientSession()
@@ -101,21 +101,21 @@ class SDEngine:
             results = await self.run(url=self.sd_t2i_url, payload=payload, session=session)
             self.save(results, save_name=f"output_{payload_idx}")
         await session.close()
-    
+
     async def run(self, url, payload, session):
         # Perform the HTTP POST request to the SD API
         async with session.post(url, json=payload, timeout=600) as rsp:
             data = await rsp.read()
-        
+
         rsp_json = json.loads(data)
         imgs = rsp_json["images"]
         logger.info(f"callback rsp json is {rsp_json.keys()}")
         return imgs
-    
+
     async def run_i2i(self):
         # todo: 添加图生图接口调用
         raise NotImplementedError
-    
+
     async def run_sam(self):
         # todo：添加SAM接口调用
         raise NotImplementedError
@@ -133,14 +133,3 @@ def batch_decode_base64_to_image(imgs, save_dir="", save_name=""):
     for idx, _img in enumerate(imgs):
         save_name = join(save_dir, save_name)
         decode_base64_to_image(_img, save_name=save_name)
-
-
-if __name__ == "__main__":
-    engine = SDEngine()
-    prompt = "1girl,  beautiful"
-    prompt = "1boy,  hansom"
-    engine.construct_payload(prompt)
-    
-    engine.simple_run_t2i(engine.payload)
-    # event_loop = asyncio.get_event_loop()
-    # event_loop.run_until_complete(engine.run_t2i([engine.payload]))
diff --git a/tests/metagpt/tools/functions/test_sd.py b/tests/metagpt/tools/functions/test_sd.py
index 405ac9a32..142101cad 100644
--- a/tests/metagpt/tools/functions/test_sd.py
+++ b/tests/metagpt/tools/functions/test_sd.py
@@ -2,16 +2,29 @@
 # @Date    : 1/10/2024 10:07 PM
 # @Author  : stellahong (stellahong@fuzhi.ai)
 # @Desc    :
+import pytest
+
 from metagpt.tools.sd_engine import SDEngine
 
+
 def test_sd_tools():
     engine = SDEngine()
     prompt = "1boy,  hansom"
     engine.construct_payload(prompt)
     engine.simple_run_t2i(engine.payload)
-    
+
+
 def test_sd_construct_payload():
     engine = SDEngine()
     prompt = "1boy,  hansom"
     engine.construct_payload(prompt)
-    assert "negative_prompt" in engine.payload
\ No newline at end of file
+    assert "negative_prompt" in engine.payload
+
+
+@pytest.mark.asyncio
+async def test_sd_asyn_t2i():
+    engine = SDEngine()
+    prompt = "1boy,  hansom"
+    engine.construct_payload(prompt)
+    await engine.run_t2i([engine.payload])
+    assert "negative_prompt" in engine.payload