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Description:

pytesttornasync 0.6.0.post2

A simple pytest plugin that provides some helpful fixtures for testing
Tornado (version 5.0 or newer) apps and easy handling of plain
(undecoratored) native coroutine tests (Python 3.5+).
Why another Tornado pytest plugin when the excellent pytest-tornado already
exists? The main reason is that I didn’t want to have to decorate every test
coroutine with @pytest.mark.gen_test. This plugin doesn’t have anything
like gen_test. Defining a test with async def and a name that
begins with test_ is all that is required.

Installation
Install using pip, which must be run with Python 3.5+:
pip install pytest-tornasync

Usage
Define an app fixture:
import pytest

@pytest.fixture
def app():
import yourapp
return yourapp.make_app() # a tornado.web.Application
Create tests as native coroutines using Python 3.5+ async def:
async def test_app(http_server_client):
resp = await http_server_client.fetch('/')
assert resp.code == 200
# ...

Fixtures
When the plugin is installed, then pytest --fixtures will show
the fixtures that are available:

http_server_port
Port used by http_server.

http_server
Start a tornado HTTP server that listens on all available interfaces.
You must create an app fixture, which returns
the tornado.web.Application to be tested.
Raises:
FixtureLookupError: tornado application fixture not found

http_server_client
Create an asynchronous HTTP client that can fetch from http_server.

http_client
Create an asynchronous HTTP client that can fetch from anywhere.

io_loop
Create a new tornado.ioloop.IOLoop for each test case.

Examples
import time

import tornado.web
import tornado.gen

import pytest

class MainHandler(tornado.web.RequestHandler):
def get(self):
self.write("Hello, world!")

@pytest.fixture
def app():
return tornado.web.Application([(r"/", MainHandler)])

async def test_http_server_client(http_server_client):
# http_server_client fetches from the `app` fixture and takes path
resp = await http_server_client.fetch('/')
assert resp.code == 200
assert resp.body == b"Hello, world!"

async def test_http_client(http_client):
# http_client fetches from anywhere and takes full URL
resp = await http_client.fetch('http://httpbin.org/status/204')
assert resp.code == 204

async def example_coroutine(period):
await tornado.gen.sleep(period)

async def test_example():
# no fixtures needed
period = 1.0
start = time.time()
await example_coroutine(period)
elapsed = time.time() - start
assert elapsed >= period

Changes

0.6.0 (2018-11-19)

minor updates to avoid a pytest warning under pytest 4
repo switch to using a ‘src’ dir

0.5.0 (2018-05-28)

updated to work with Tornado 5, which is now the minimum required version
require pytest >= 3.0
the io_loop fixture always refers to a tornado.ioloop.IOLoop instance now
the io_loop_asyncio and io_loop_tornado fixtures have been removed, since
now that Tornado 5 always uses asyncio under Python 3, there would be no
difference between the two fixtures, so io_loop is all that is needed
tox tests now test more versions of Tornado (5.0.* and latest 5.*),
Pytest (3.0.* and latest 3.*), and Python (3.5, 3.6, 3.7, and pypy3).