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+from fastapi import FastAPI
+from fastapi.params import File as FileParam
+from fastapi.params import Form as FormParam
+from fastapi.testclient import TestClient
+from typing_extensions import Annotated
+
+
+def test_annotated_form_without_positional_default():
+ app = FastAPI()
+
+ @app.post("/submit")
+ def submit(name: Annotated[str, FormParam()]):
+ return {"name": name}
+
+ client = TestClient(app)
+ response = client.post("/submit", data={"name": "Ada"})
+
+ assert response.status_code == 200
+ assert response.json() == {"name": "Ada"}
+
+
+def test_annotated_file_without_positional_default():
+ app = FastAPI()
+
+ @app.post("/upload")
+ async def upload(payload: Annotated[bytes, FileParam()]):
+ return {"size": len(payload)}
+
+ client = TestClient(app)
+ response = client.post("/upload", files={"payload": ("note.txt", b"hello")})
+
+ assert response.status_code == 200
+ assert response.json() == {"size": 5}
+
+
+def test_plain_query_parameter_default_still_works():
+ app = FastAPI()
+
+ @app.get("/items")
+ def read_items(q: str = "default"):
+ return {"q": q}
+
+ client = TestClient(app)
+ assert client.get("/items").json() == {"q": "default"}
+ assert client.get("/items", params={"q": "set"}).json() == {"q": "set"}
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