add a test case for python-fastapi query parameter default value (#15744)

samples/server/petstore/python-fastapi/src/openapi_server/apis/fake_api.py

@@ -0,0 +1,49 @@
+# coding: utf-8
+
+from typing import Dict, List  # noqa: F401
+import importlib
+import pkgutil
+
+from openapi_server.apis.fake_api_base import BaseFakeApi
+import openapi_server.impl
+
+from fastapi import (  # noqa: F401
+    APIRouter,
+    Body,
+    Cookie,
+    Depends,
+    Form,
+    Header,
+    Path,
+    Query,
+    Response,
+    Security,
+    status,
+)
+
+from openapi_server.models.extra_models import TokenModel  # noqa: F401
+
+
+router = APIRouter()
+
+ns_pkg = openapi_server.impl
+for _, name, _ in pkgutil.iter_modules(ns_pkg.__path__, ns_pkg.__name__ + "."):
+    importlib.import_module(name)
+
+
+@router.get(
+    "/fake/query_param_default",
+    responses={
+        400: {"description": "Invalid username supplied"},
+        404: {"description": "User not found"},
+    },
+    tags=["fake"],
+    summary="test query parameter default value",
+    response_model_by_alias=True,
+)
+async def fake_query_param_default(
+    has_default: str = Query('Hello World', description="has default value"),
+    no_default: str = Query(None, description="no default value"),
+) -> None:
+    """"""
+    return BaseFakeApi.subclasses[0]().fake_query_param_default(has_default, no_default)

samples/server/petstore/python-fastapi/src/openapi_server/apis/fake_api_base.py

@@ -0,0 +1,19 @@
+# coding: utf-8
+
+from typing import ClassVar, Dict, List, Tuple  # noqa: F401
+
+
+
+class BaseFakeApi:
+    subclasses: ClassVar[Tuple] = ()
+
+    def __init_subclass__(cls, **kwargs):
+        super().__init_subclass__(**kwargs)
+        BaseFakeApi.subclasses = BaseFakeApi.subclasses + (cls,)
+    def fake_query_param_default(
+        self,
+        has_default: str,
+        no_default: str,
+    ) -> None:
+        """"""
+        ...

samples/server/petstore/python-fastapi/src/openapi_server/main.py

@@ -12,6 +12,7 @@
 
 from fastapi import FastAPI
 
+from openapi_server.apis.fake_api import router as FakeApiRouter
 from openapi_server.apis.pet_api import router as PetApiRouter
 from openapi_server.apis.store_api import router as StoreApiRouter
 from openapi_server.apis.user_api import router as UserApiRouter
@@ -22,6 +23,7 @@ app = FastAPI(
     version="1.0.0",
 )
 
+app.include_router(FakeApiRouter)
 app.include_router(PetApiRouter)
 app.include_router(StoreApiRouter)
 app.include_router(UserApiRouter)