add pytest_plugins

[samuelcolvin]

What do these changes do?

Add custom plugin to support testing with pytest. Therefore:

• remove the reliance on pytest-asyncio.
• remove all unnecessary boilerplate from tests making getting started with tests easier.

I'm submitting it before I finish it to see if you're willing to merge this idea?

Are there changes in behavior for the user?

Making testing as easy as possible, for example:

from aiohttp import web
pytest_plugins = 'aiohttp.pytest_plugins'

async def hello(request):
    return web.Response(body=b'Hello, world')

def create_app(loop):
    app = web.Application(loop=loop)
    app.router.add_route('GET', '/', hello)
    return app

async def test_hello(test_client):
    client = await test_client(create_app)
    resp = await client.get('/')
    assert resp.status == 200
    text = await resp.text()
    assert 'Hello, world' in text

Related issue number

#423

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes

[coveralls]

Coverage decreased (-0.7%) to 97.433% when pulling 816c72f on samuelcolvin:pytest-plugins into fc2b408 on KeepSafe:master.

[coveralls]

Coverage decreased (-0.5%) to 97.588% when pulling d8724a6 on samuelcolvin:pytest-plugins into fc2b408 on KeepSafe:master.

[asvetlov]

Looks good!

[coveralls]

Coverage decreased (-0.1%) to 97.962% when pulling 1cbed6e on samuelcolvin:pytest-plugins into f180199 on KeepSafe:master.

[coveralls]

Coverage decreased (-0.1%) to 97.962% when pulling 0aa25b2 on samuelcolvin:pytest-plugins into f180199 on KeepSafe:master.

[samuelcolvin]

ready.

[samuelcolvin]

If this is ok it would be great to get it merged before the next release.

[asvetlov]

Merged. Thank you very much.

[lock]

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