PyTest Tornado: 'SimpleAsyncHTTPClient' is not iterable

Trying to make test code for long polling under PyTest, Tornado.

My test code is at below.

conftest.py

from tornado.httpclient import AsyncHTTPClient


@pytest.fixture
async def tornado_server():
print("ntornado_server()")

@pytest.fixture
async def http_client(tornado_server):
client = AsyncHTTPClient()
return client


@pytest.yield_fixture(scope='session')
def event_loop(request):
loop = asyncio.get_event_loop_policy().new_event_loop()
yield loop
loop.close()


test_my.py

from tornado.httpclient import HTTPRequest, HTTPError
def test_http_client(event_loop):
url = 'http://httpbin.org/get'
resp = event_loop.run_until_complete(http_client(url))
assert b'HTTP/1.1 200 OK' in resp


I expected this result finish as success.
But it failed.

def test_http_client(event_loop):
url = 'http://httpbin.org/get'
resp = event_loop.run_until_complete(http_client(url))
assert b'HTTP/1.1 200 OK' in resp E TypeError: argument of type 'SimpleAsyncHTTPClient' is not iterable


What did I do wrong?

2 Answers
2

To use a pytest fixture, you must list it as an argument to your function:

def test_http_client(event_loop, http_client):


AsyncHTTPClient is not callable; it has a fetch method:

fetch

resp = event_loop.run_until_complete(http_client.fetch(url))


What's happening in your code is that you're calling the fixture instead of letting pytest initialize it, and passing url as its tornado_server argument.

url

tornado_server

Also consider using pytest-asyncio or pytest-tornado, which lets you use await instead of run_until_complete (this is the usual method of using pytest with tornado or asyncio):

pytest-asyncio

pytest-tornado

await

run_until_complete

@pytest.mark.asyncio
async def test_http_client(http_client):
url = 'http://httpbin.org/get'
resp = await http_client.fetch(url)
assert resp.code == 200


Try assert "200" in resp.code or assert "OK" in resp.reasonin your test_http_client() function.

assert "200" in resp.code

assert "OK" in resp.reason

The object that is getting assigned to resp is the AsyncHTTPClient, not the response itself. To call the response message, you need something like resp.code, resp.reason, resp.body, resp.headers, etc.

resp

resp.code, resp.reason, resp.body, resp.headers

Here's a list of things that you can call http://www.tornadoweb.org/en/stable/httpclient.html#response-objects

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