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test_base.py
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test_base.py
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import pytest
from starlette.applications import Starlette
from starlette.middleware import Middleware
from starlette.middleware.base import BaseHTTPMiddleware
from starlette.responses import PlainTextResponse, StreamingResponse
from starlette.routing import Route
from starlette.testclient import TestClient
class CustomMiddleware(BaseHTTPMiddleware):
async def dispatch(self, request, call_next):
response = await call_next(request)
response.headers["Custom-Header"] = "Example"
return response
app = Starlette()
app.add_middleware(CustomMiddleware)
@app.route("/")
def homepage(request):
return PlainTextResponse("Homepage")
@app.route("/exc")
def exc(request):
raise Exception()
@app.route("/no-response")
class NoResponse:
def __init__(self, scope, receive, send):
pass
def __await__(self):
return self.dispatch().__await__()
async def dispatch(self):
pass
@app.websocket_route("/ws")
async def websocket_endpoint(session):
await session.accept()
await session.send_text("Hello, world!")
await session.close()
def test_custom_middleware():
client = TestClient(app)
response = client.get("/")
assert response.headers["Custom-Header"] == "Example"
with pytest.raises(Exception):
response = client.get("/exc")
with pytest.raises(RuntimeError):
response = client.get("/no-response")
with client.websocket_connect("/ws") as session:
text = session.receive_text()
assert text == "Hello, world!"
def test_middleware_decorator():
app = Starlette()
@app.route("/homepage")
def homepage(request):
return PlainTextResponse("Homepage")
@app.middleware("http")
async def plaintext(request, call_next):
if request.url.path == "/":
return PlainTextResponse("OK")
response = await call_next(request)
response.headers["Custom"] = "Example"
return response
client = TestClient(app)
response = client.get("/")
assert response.text == "OK"
response = client.get("/homepage")
assert response.text == "Homepage"
assert response.headers["Custom"] == "Example"
def test_state_data_across_multiple_middlewares():
expected_value1 = "foo"
expected_value2 = "bar"
class aMiddleware(BaseHTTPMiddleware):
async def dispatch(self, request, call_next):
request.state.foo = expected_value1
response = await call_next(request)
return response
class bMiddleware(BaseHTTPMiddleware):
async def dispatch(self, request, call_next):
request.state.bar = expected_value2
response = await call_next(request)
response.headers["X-State-Foo"] = request.state.foo
return response
class cMiddleware(BaseHTTPMiddleware):
async def dispatch(self, request, call_next):
response = await call_next(request)
response.headers["X-State-Bar"] = request.state.bar
return response
app = Starlette()
app.add_middleware(aMiddleware)
app.add_middleware(bMiddleware)
app.add_middleware(cMiddleware)
@app.route("/")
def homepage(request):
return PlainTextResponse("OK")
client = TestClient(app)
response = client.get("/")
assert response.text == "OK"
assert response.headers["X-State-Foo"] == expected_value1
assert response.headers["X-State-Bar"] == expected_value2
def test_app_middleware_argument():
def homepage(request):
return PlainTextResponse("Homepage")
app = Starlette(
routes=[Route("/", homepage)], middleware=[Middleware(CustomMiddleware)]
)
client = TestClient(app)
response = client.get("/")
assert response.headers["Custom-Header"] == "Example"
def test_middleware_repr():
middleware = Middleware(CustomMiddleware)
assert repr(middleware) == "Middleware(CustomMiddleware)"
async def numbers_stream(minimum, maximum):
yield ("<html><body><ul>")
for number in range(minimum, maximum + 1):
yield "<li>%d</li>" % number
yield ("</ul></body></html>")
async def somthing_broken(minimum, maximum, error_at=2):
if error_at <= 0:
raise RuntimeError("This is a stream that breaks when it starts")
yield ("<html><body><ul>")
for number in range(minimum, maximum + 1):
yield "<li>%d</li>" % number
if number >= error_at:
raise RuntimeError("This is a broken stream")
@app.route("/streaming")
async def some_streaming(_):
return StreamingResponse(numbers_stream(1, 3))
@app.route("/broken-streaming/{error_at:int}")
async def some_broken_streaming(request):
error_at = request.path_params["error_at"]
return StreamingResponse(somthing_broken(1, 5, error_at=error_at))
def test_custom_middleware_streaming():
client = TestClient(app)
response = client.get("/streaming")
assert response.headers["Custom-Header"] == "Example"
assert (
response.text
== "<html><body><ul><li>1</li><li>2</li><li>3</li></ul></body></html>"
)
with pytest.raises(RuntimeError):
# after body streaming has started
response = client.get("/broken-streaming/2")
with pytest.raises(RuntimeError):
# right before body stream starts (only start message emitted)
# this should trigger _first_ message being None
response = client.get("/broken-streaming/0")