import pytest

from starlette.applications import Starlette
from starlette.responses import JSONResponse
from starlette.testclient import TestClient

mock_service = Starlette()


@mock_service.route("/")
def mock_service_endpoint(request):
    return JSONResponse({"mock": "example"})


app = Starlette()


@app.route("/")
def homepage(request):
    client = TestClient(mock_service)
    response = client.get("/")
    return JSONResponse(response.json())


startup_error_app = Starlette()


@startup_error_app.on_event("startup")
def startup():
    raise RuntimeError()


def test_use_testclient_in_endpoint():
    """
    We should be able to use the test client within applications.

    This is useful if we need to mock out other services,
    during tests or in development.
    """
    client = TestClient(app)
    response = client.get("/")
    assert response.json() == {"mock": "example"}


def testclient_as_contextmanager():
    with TestClient(app):
        pass


def test_error_on_startup():
    with pytest.raises(RuntimeError):
        with TestClient(startup_error_app):
            pass  # pragma: no cover