Add variants for `openapi-callbacks/tutorial001`

docs/en/docs/advanced/openapi-callbacks.md

@@ -31,7 +31,7 @@ It will have a *path operation* that will receive an `Invoice` body, and a query
 
 This part is pretty normal, most of the code is probably already familiar to you:
 
-{* ../../docs_src/openapi_callbacks/tutorial001.py hl[9:13,36:53] *}
+{* ../../docs_src/openapi_callbacks/tutorial001_py310.py hl[7:11,34:51] *}
 
 /// tip
 
@@ -90,7 +90,7 @@ Temporarily adopting this point of view (of the *external developer*) can help y
 
 First create a new `APIRouter` that will contain one or more callbacks.
 
-{* ../../docs_src/openapi_callbacks/tutorial001.py hl[3,25] *}
+{* ../../docs_src/openapi_callbacks/tutorial001_py310.py hl[1,23] *}
 
 ### Create the callback *path operation* { #create-the-callback-path-operation }
 
@@ -101,7 +101,7 @@ It should look just like a normal FastAPI *path operation*:
 * It should probably have a declaration of the body it should receive, e.g. `body: InvoiceEvent`.
 * And it could also have a declaration of the response it should return, e.g. `response_model=InvoiceEventReceived`.
 
-{* ../../docs_src/openapi_callbacks/tutorial001.py hl[16:18,21:22,28:32] *}
+{* ../../docs_src/openapi_callbacks/tutorial001_py310.py hl[14:16,19:20,26:30] *}
 
 There are 2 main differences from a normal *path operation*:
 
@@ -169,7 +169,7 @@ At this point you have the *callback path operation(s)* needed (the one(s) that
 
 Now use the parameter `callbacks` in *your API's path operation decorator* to pass the attribute `.routes` (that's actually just a `list` of routes/*path operations*) from that callback router:
 
-{* ../../docs_src/openapi_callbacks/tutorial001.py hl[35] *}
+{* ../../docs_src/openapi_callbacks/tutorial001_py310.py hl[33] *}
 
 /// tip
 

docs_src/openapi_callbacks/tutorial001_py310.py

@@ -0,0 +1,51 @@
+from fastapi import APIRouter, FastAPI
+from pydantic import BaseModel, HttpUrl
+
+app = FastAPI()
+
+
+class Invoice(BaseModel):
+    id: str
+    title: str | None = None
+    customer: str
+    total: float
+
+
+class InvoiceEvent(BaseModel):
+    description: str
+    paid: bool
+
+
+class InvoiceEventReceived(BaseModel):
+    ok: bool
+
+
+invoices_callback_router = APIRouter()
+
+
+@invoices_callback_router.post(
+    "{$callback_url}/invoices/{$request.body.id}", response_model=InvoiceEventReceived
+)
+def invoice_notification(body: InvoiceEvent):
+    pass
+
+
+@app.post("/invoices/", callbacks=invoices_callback_router.routes)
+def create_invoice(invoice: Invoice, callback_url: HttpUrl | None = None):
+    """
+    Create an invoice.
+
+    This will (let's imagine) let the API user (some external developer) create an
+    invoice.
+
+    And this path operation will:
+
+    * Send the invoice to the client.
+    * Collect the money from the client.
+    * Send a notification back to the API user (the external developer), as a callback.
+        * At this point is that the API will somehow send a POST request to the
+            external API with the notification of the invoice event
+            (e.g. "payment successful").
+    """
+    # Send the invoice, collect the money, send the notification (the callback)
+    return {"msg": "Invoice received"}

tests/test_tutorial/test_openapi_callbacks/test_tutorial001.py

@@ -1,12 +1,33 @@
+import importlib
+from types import ModuleType
+
+import pytest
 from dirty_equals import IsDict
 from fastapi.testclient import TestClient
 
-from docs_src.openapi_callbacks.tutorial001 import app, invoice_notification
+from tests.utils import needs_py310
+
+
+@pytest.fixture(
+    name="mod",
+    params=[
+        pytest.param("tutorial001"),
+        pytest.param("tutorial001_py310", marks=needs_py310),
+    ],
+)
+def get_mod(request: pytest.FixtureRequest):
+    mod = importlib.import_module(f"docs_src.openapi_callbacks.{request.param}")
+    return mod
+
 
-client = TestClient(app)
+@pytest.fixture(name="client")
+def get_client(mod: ModuleType):
+    client = TestClient(mod.app)
+    client.headers.clear()
+    return client
 
 
-def test_get():
+def test_get(client: TestClient):
     response = client.post(
         "/invoices/", json={"id": "fooinvoice", "customer": "John", "total": 5.3}
     )
@@ -14,12 +35,12 @@ def test_get():
     assert response.json() == {"msg": "Invoice received"}
 
 
-def test_dummy_callback():
+def test_dummy_callback(mod: ModuleType):
     # Just for coverage
-    invoice_notification({})
+    mod.invoice_notification({})
 
 
-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() == {