Simplify tests

tests/test_response_model_default_factory.py

@@ -1,18 +1,13 @@
-import functools
-import random
-
 from fastapi import FastAPI
 from fastapi.testclient import TestClient
 from pydantic import BaseModel, Field
 
 app = FastAPI()
 
-messages = ["操作成功.", "Successful operation."]
-
 
 class ResponseModel(BaseModel):
     code: int = 200
-    message: str = Field(default_factory=functools.partial(random.choice, messages))
+    message: str = Field(default_factory=lambda: "Successful operation.")
 
 
 @app.get(
@@ -40,7 +35,7 @@ def test_response_model_has_default_factory_return_dict():
     assert response.status_code == 200, response.text
 
     assert response.json()["code"] == 200
-    assert response.json()["message"] in messages
+    assert response.json()["message"] == "Successful operation."
 
 
 def test_response_model_has_default_factory_return_model():
@@ -49,4 +44,4 @@ def test_response_model_has_default_factory_return_model():
     assert response.status_code == 200, response.text
 
     assert response.json()["code"] == 200
-    assert response.json()["message"] in messages
+    assert response.json()["message"] == "Successful operation."