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"""Test for issue #10180: Mounting sub-applications under APIRouter."""
from fastapi import FastAPI, APIRouter
from starlette.testclient import TestClient
def test_mount_subapp_under_router():
"""Sub-application mounted under APIRouter should be reachable."""
app = FastAPI()
api_router = APIRouter(prefix="/api")
@api_router.get("/app")
def read_main():
return {"message": "Hello World from main app"}
app.include_router(api_router)
subapi = FastAPI()
@subapi.get("/sub")
def read_sub():
return {"message": "Hello World from sub API"}
api_router.mount("/subapi", subapi)
client = TestClient(app)
# Main app endpoint works
response = client.get("/api/app")
assert response.status_code == 200
assert response.json() == {"message": "Hello World from main app"}
# Sub-application endpoint should work (this is the bug)
response = client.get("/api/subapi/sub")
assert response.status_code == 200
assert response.json() == {"message": "Hello World from sub API"}
def test_mount_subapp_docs():
"""Sub-application should have its own OpenAPI docs."""
app = FastAPI()
api_router = APIRouter(prefix="/api")
app.include_router(api_router)
subapi = FastAPI()
@subapi.get("/sub")
def read_sub():
return {"message": "sub"}
api_router.mount("/subapi", subapi)
client = TestClient(app)
# Sub-app docs should be accessible
response = client.get("/api/subapi/docs")
assert response.status_code == 200
def test_mount_subapp_after_include():
"""Mounting a sub-app after include_router should still work."""
app = FastAPI()
api_router = APIRouter(prefix="/api")
@api_router.get("/main")
def read_main():
return {"ok": True}
# Mount sub-app BEFORE include_router
subapi = FastAPI()
@subapi.get("/endpoint")
def read_endpoint():
return {"sub": True}
api_router.mount("/sub", subapi)
app.include_router(api_router)
client = TestClient(app)
assert client.get("/api/main").status_code == 200
assert client.get("/api/sub/endpoint").status_code == 200