Add variants for `additional_responses/tutorial002`

docs/en/docs/advanced/additional-responses.md

@@ -175,7 +175,7 @@ You can use this same `responses` parameter to add different media types for the
 
 For example, you can add an additional media type of `image/png`, declaring that your *path operation* can return a JSON object (with media type `application/json`) or a PNG image:
 
-{* ../../docs_src/additional_responses/tutorial002.py hl[19:24,28] *}
+{* ../../docs_src/additional_responses/tutorial002_py310.py hl[17:22,26] *}
 
 /// note
 

docs_src/additional_responses/tutorial002_py310.py

@@ -0,0 +1,28 @@
+from fastapi import FastAPI
+from fastapi.responses import FileResponse
+from pydantic import BaseModel
+
+
+class Item(BaseModel):
+    id: str
+    value: str
+
+
+app = FastAPI()
+
+
+@app.get(
+    "/items/{item_id}",
+    response_model=Item,
+    responses={
+        200: {
+            "content": {"image/png": {}},
+            "description": "Return the JSON item or an image.",
+        }
+    },
+)
+async def read_item(item_id: str, img: bool | None = None):
+    if img:
+        return FileResponse("image.png", media_type="image/png")
+    else:
+        return {"id": "foo", "value": "there goes my hero"}

tests/test_tutorial/test_additional_responses/test_tutorial002.py

@@ -1,21 +1,36 @@
+import importlib
 import os
 import shutil
 
+import pytest
 from dirty_equals import IsDict
 from fastapi.testclient import TestClient
 
-from docs_src.additional_responses.tutorial002 import app
+from tests.utils import needs_py310
 
-client = TestClient(app)
+
+@pytest.fixture(
+    name="client",
+    params=[
+        pytest.param("tutorial002"),
+        pytest.param("tutorial002_py310", marks=needs_py310),
+    ],
+)
+def get_client(request: pytest.FixtureRequest):
+    mod = importlib.import_module(f"docs_src.additional_responses.{request.param}")
+
+    client = TestClient(mod.app)
+    client.headers.clear()
+    return client
 
 
-def test_path_operation():
+def test_path_operation(client: TestClient):
     response = client.get("/items/foo")
     assert response.status_code == 200, response.text
     assert response.json() == {"id": "foo", "value": "there goes my hero"}
 
 
-def test_path_operation_img():
+def test_path_operation_img(client: TestClient):
     shutil.copy("./docs/en/docs/img/favicon.png", "./image.png")
     response = client.get("/items/foo?img=1")
     assert response.status_code == 200, response.text
@@ -24,7 +39,7 @@ def test_path_operation_img():
     os.remove("./image.png")
 
 
-def test_openapi_schema():
+def test_openapi_schema(client: TestClient):
     response = client.get("/openapi.json")
     assert response.status_code == 200, response.text
     assert response.json() == {