Add variants for `dataclasses/tutorial001`

docs/en/docs/advanced/dataclasses.md

@@ -4,7 +4,7 @@ FastAPI is built on top of **Pydantic**, and I have been showing you how to use
 
 But FastAPI also supports using <a href="https://docs.python.org/3/library/dataclasses.html" class="external-link" target="_blank">`dataclasses`</a> the same way:
 
-{* ../../docs_src/dataclasses/tutorial001.py hl[1,7:12,19:20] *}
+{* ../../docs_src/dataclasses/tutorial001_py310.py hl[1,6:11,18:19] *}
 
 This is still supported thanks to **Pydantic**, as it has <a href="https://docs.pydantic.dev/latest/concepts/dataclasses/#use-of-stdlib-dataclasses-with-basemodel" class="external-link" target="_blank">internal support for `dataclasses`</a>.
 

docs_src/dataclasses/tutorial001_py310.py

@@ -0,0 +1,19 @@
+from dataclasses import dataclass
+
+from fastapi import FastAPI
+
+
+@dataclass
+class Item:
+    name: str
+    price: float
+    description: str | None = None
+    tax: float | None = None
+
+
+app = FastAPI()
+
+
+@app.post("/items/")
+async def create_item(item: Item):
+    return item

tests/test_tutorial/test_dataclasses/test_tutorial001.py

@@ -1,12 +1,28 @@
+import importlib
+
+import pytest
 from dirty_equals import IsDict
 from fastapi.testclient import TestClient
 
-from docs_src.dataclasses.tutorial001 import app
+from tests.utils import needs_py310
+
+
+@pytest.fixture(
+    name="client",
+    params=[
+        pytest.param("tutorial001"),
+        pytest.param("tutorial001_py310", marks=needs_py310),
+    ],
+)
+def get_client(request: pytest.FixtureRequest):
+    mod = importlib.import_module(f"docs_src.dataclasses.{request.param}")
 
-client = TestClient(app)
+    client = TestClient(mod.app)
+    client.headers.clear()
+    return client
 
 
-def test_post_item():
+def test_post_item(client: TestClient):
     response = client.post("/items/", json={"name": "Foo", "price": 3})
     assert response.status_code == 200
     assert response.json() == {
@@ -17,7 +33,7 @@ def test_post_item():
     }
 
 
-def test_post_invalid_item():
+def test_post_invalid_item(client: TestClient):
     response = client.post("/items/", json={"name": "Foo", "price": "invalid price"})
     assert response.status_code == 422
     assert response.json() == IsDict(
@@ -45,7 +61,7 @@ def test_post_invalid_item():
     )
 
 
-def test_openapi_schema():
+def test_openapi_schema(client: TestClient):
     response = client.get("/openapi.json")
     assert response.status_code == 200
     assert response.json() == {