Aiohttp integration (#270)

* Add aiohttp extension module

* Add giphynav-aiohttp app

* Add missing docstrings

* Remove print() call

* Remove not needed import from flask extension tests

* Improve coroutine provider tests

* Add aiohttp extension tests

* Update tox.ini

* Add aiohttp extras

* Try fix Python 3.4 tests

* Try fix 3.6 tests

* Stop running coroutine tests for Python 3.4

* Rename tests

* Remove type hints

* Fix pypy and change python version for coverage job to 3.8

* Fix coveralls job

* Try fix Python 3.4, 3.5 tests

* Make coverage job to run 3.5+ tests

* Add tests

* Add readme

* Update the readmes

* Add API docs

* Add API docs page

* Update changelog

.travis.yml

@@ -3,7 +3,7 @@ dist: xenial
 language: python
 jobs:
   include:
-  - python: 3.6
+  - python: 3.8
     env: TOXENV=coveralls DEPENDENCY_INJECTOR_DEBUG_MODE=1
     install:
       - pip install tox

docs/api/aiohttpext.rst

@@ -0,0 +1,9 @@
+dependency_injector.ext.aiohttp
+===============================
+
+.. automodule:: dependency_injector.ext.aiohttp
+   :members:
+   :special-members:
+
+
+.. disqus::

docs/api/index.rst

@@ -8,4 +8,5 @@ API Documentation
     providers
     containers
     errors
+    aiohttpext
     flaskext

docs/main/changelog.rst

@@ -7,6 +7,11 @@ that were made in every particular version.
 From version 0.7.6 *Dependency Injector* framework strictly 
 follows `Semantic versioning`_
 
+Development version
+-------------------
+- Add ``Aiohttp`` integration module ``dependency_injector.ext.aiohttp``.
+- Add ``Aiohttp`` + ``Dependency Injector`` example ``giphynav-aiohttp``.
+
 3.23.2
 ------
 - Fix ``Flask`` tutorial code issues, typos and change some wording.
@@ -48,7 +53,7 @@ follows `Semantic versioning`_
 
 3.20.0
 ------
-- Add ``Flask`` integration module ``dependency_injector.flask.ext``.
+- Add ``Flask`` integration module ``dependency_injector.ext.flask``.
 - Add ``Flask`` + ``Dependency Injector`` example ``ghnav-flask``.
 - Add ``Factory.provides`` attribute. It is an alias to the ``Factory.cls``.
 - New README.

examples/miniapps/ghnav-flask/README.rst

@@ -68,7 +68,7 @@ After that visit http://127.0.0.1:5000/ in your browser.
 Test
 ----
 
-This application comes with unit tests.
+This application comes with the unit tests.
 
 To run the tests do:
 

examples/miniapps/giphynav-aiohttp/README.rst

@@ -0,0 +1,117 @@
+Aiohttp Dependency Injection Example
+====================================
+
+Application ``giphynavigator`` is a `Aiohttp <https://docs.aiohttp.org/>`_ +
+`Dependency Injector <http://python-dependency-injector.ets-labs.org/>`_ application.
+
+Run
+---
+
+Create virtual environment:
+
+.. code-block:: bash
+
+   virtualenv venv
+   . venv/bin/activate
+
+Install requirements:
+
+.. code-block:: bash
+
+    pip install -r requirements.txt
+
+To run the application do:
+
+.. code-block:: bash
+
+    export GIPHY_API_KEY=wBJ2wZG7SRqfrU9nPgPiWvORmloDyuL0
+    adev runserver giphynavigator/application.py --livereload
+
+The output should be something like:
+
+.. code-block::
+
+   [18:52:59] Starting aux server at http://localhost:8001 ◆
+   [18:52:59] Starting dev server at http://localhost:8000 ●
+
+After that visit http://127.0.0.1:8000/ in your browser or use CLI command (``curl``, ``httpie``,
+etc). You should see something like:
+
+.. code-block:: json
+
+   {
+       "query": "Dependency Injector",
+       "limit": 10,
+       "gifs": [
+           {
+               "url": "https://giphy.com/gifs/boxes-dependent-swbf2-6Eo7KzABxgJMY"
+           },
+           {
+               "url": "https://giphy.com/gifs/depends-J56qCcOhk6hKE"
+           },
+           {
+               "url": "https://giphy.com/gifs/web-series-ccstudios-bro-dependent-1lhU8KAVwmVVu"
+           },
+           {
+               "url": "https://giphy.com/gifs/TheBoysTV-friends-friend-weneedeachother-XxR9qcIwcf5Jq404Sx"
+           },
+           {
+               "url": "https://giphy.com/gifs/netflix-a-series-of-unfortunate-events-asoue-9rgeQXbwoK53pcxn7f"
+           },
+           {
+               "url": "https://giphy.com/gifs/black-and-white-sad-skins-Hs4YzLs2zJuLu"
+           },
+           {
+               "url": "https://giphy.com/gifs/always-there-for-you-i-am-here-PlayjhCco9jHBYrd9w"
+           },
+           {
+               "url": "https://giphy.com/gifs/stream-famous-dollar-YT2dvOByEwXCdoYiA1"
+           },
+           {
+               "url": "https://giphy.com/gifs/i-love-you-there-for-am-1BhGzgpZXYWwWMAGB1"
+           },
+           {
+               "url": "https://giphy.com/gifs/life-like-twerk-9hlnWxjHqmH28"
+           }
+       ]
+   }
+
+.. note::
+
+   To create your own Giphy API key follow this
+   `guide <https://support.giphy.com/hc/en-us/articles/360020283431-Request-A-GIPHY-API-Key>`_.
+
+Test
+----
+
+This application comes with the unit tests.
+
+To run the tests do:
+
+.. code-block:: bash
+
+   py.test giphynavigator/tests.py --cov=giphynavigator
+
+The output should be something like:
+
+.. code-block::
+
+   platform darwin -- Python 3.8.3, pytest-5.4.3, py-1.9.0, pluggy-0.13.1
+   plugins: cov-2.10.0, aiohttp-0.3.0, asyncio-0.14.0
+   collected 3 items
+
+   giphynavigator/tests.py ...                                     [100%]
+
+   ---------- coverage: platform darwin, python 3.8.3-final-0 -----------
+   Name                            Stmts   Miss  Cover
+   ---------------------------------------------------
+   giphynavigator/__init__.py          0      0   100%
+   giphynavigator/__main__.py          5      5     0%
+   giphynavigator/application.py      10      0   100%
+   giphynavigator/containers.py       10      0   100%
+   giphynavigator/giphy.py            16     11    31%
+   giphynavigator/services.py          9      1    89%
+   giphynavigator/tests.py            35      0   100%
+   giphynavigator/views.py             7      0   100%
+   ---------------------------------------------------
+   TOTAL                              92     17    82%

examples/miniapps/giphynav-aiohttp/config.yml

@@ -0,0 +1,5 @@
+giphy:
+  request_timeout: 10
+search:
+  default_query: "Dependency Injector"
+  default_limit: 10

examples/miniapps/giphynav-aiohttp/giphynavigator/__init__.py

@@ -0,0 +1 @@
+"""Top-level package."""

examples/miniapps/giphynav-aiohttp/giphynavigator/__main__.py

@@ -0,0 +1,10 @@
+"""Main module."""
+
+from aiohttp import web
+
+from .application import create_app
+
+
+if __name__ == '__main__':
+    app = create_app()
+    web.run_app(app)

examples/miniapps/giphynav-aiohttp/giphynavigator/application.py

@@ -0,0 +1,21 @@
+"""Application module."""
+
+from aiohttp import web
+
+from .containers import ApplicationContainer
+
+
+def create_app():
+    """Create and return Flask application."""
+    container = ApplicationContainer()
+    container.config.from_yaml('config.yml')
+    container.config.giphy.api_key.from_env('GIPHY_API_KEY')
+
+    app: web.Application = container.app()
+    app.container = container
+
+    app.add_routes([
+        web.get('/', container.index_view.as_view()),
+    ])
+
+    return app

examples/miniapps/giphynav-aiohttp/giphynavigator/containers.py

@@ -0,0 +1,33 @@
+"""Application containers module."""
+
+from dependency_injector import containers, providers
+from dependency_injector.ext import aiohttp
+
+from aiohttp import web
+from . import giphy, services, views
+
+
+class ApplicationContainer(containers.DeclarativeContainer):
+    """Application container."""
+
+    app = aiohttp.Application(web.Application)
+
+    config = providers.Configuration()
+
+    giphy_client = providers.Factory(
+        giphy.GiphyClient,
+        api_key=config.giphy.api_key,
+        timeout=config.giphy.request_timeout,
+    )
+
+    search_service = providers.Factory(
+        services.SearchService,
+        giphy_client=giphy_client,
+    )
+
+    index_view = aiohttp.View(
+        views.index,
+        search_service=search_service,
+        default_query=config.search.default_query,
+        default_limit=config.search.default_limit,
+    )

examples/miniapps/giphynav-aiohttp/giphynavigator/giphy.py

@@ -0,0 +1,29 @@
+"""Giphy client module."""
+
+from aiohttp import ClientSession, ClientTimeout
+
+
+class GiphyClient:
+
+    API_URL = 'http://api.giphy.com/v1'
+
+    def __init__(self, api_key, timeout):
+        self._api_key = api_key
+        self._timeout = ClientTimeout(timeout)
+
+    async def search(self, query, limit):
+        """Make search API call and return result."""
+        if not query:
+            return []
+
+        url = f'{self.API_URL}/gifs/search'
+        params = {
+            'q': query,
+            'api_key': self._api_key,
+            'limit': limit,
+        }
+        async with ClientSession(timeout=self._timeout) as session:
+            async with session.get(url, params=params) as response:
+                if response.status != 200:
+                    response.raise_for_status()
+                return await response.json()

examples/miniapps/giphynav-aiohttp/giphynavigator/services.py

@@ -0,0 +1,18 @@
+"""Services module."""
+
+from .giphy import GiphyClient
+
+
+class SearchService:
+
+    def __init__(self, giphy_client: GiphyClient):
+        self._giphy_client = giphy_client
+
+    async def search(self, query, limit):
+        """Search for gifs and return formatted data."""
+        if not query:
+            return []
+
+        result = await self._giphy_client.search(query, limit)
+
+        return [{'url': gif['url']} for gif in result['data']]

examples/miniapps/giphynav-aiohttp/giphynavigator/tests.py

@@ -0,0 +1,77 @@
+"""Tests module."""
+
+from unittest import mock
+
+import pytest
+
+from giphynavigator.application import create_app
+from giphynavigator.giphy import GiphyClient
+
+
+@pytest.fixture
+def app():
+    return create_app()
+
+
+@pytest.fixture
+def client(app, aiohttp_client, loop):
+    return loop.run_until_complete(aiohttp_client(app))
+
+
+async def test_index(client, app):
+    giphy_client_mock = mock.AsyncMock(spec=GiphyClient)
+    giphy_client_mock.search.return_value = {
+        'data': [
+            {'url': 'https://giphy/gif1.gif'},
+            {'url': 'https://giphy/gif2.gif'},
+        ],
+    }
+
+    with app.container.giphy_client.override(giphy_client_mock):
+        response = await client.get(
+            '/',
+            params={
+                'query': 'test',
+                'limit': 10,
+            },
+        )
+
+    assert response.status == 200
+    data = await response.json()
+    assert data == {
+        'query': 'test',
+        'limit': 10,
+        'gifs': [
+            {'url': 'https://giphy/gif1.gif'},
+            {'url': 'https://giphy/gif2.gif'},
+        ],
+    }
+
+
+async def test_index_no_data(client, app):
+    giphy_client_mock = mock.AsyncMock(spec=GiphyClient)
+    giphy_client_mock.search.return_value = {
+        'data': [],
+    }
+
+    with app.container.giphy_client.override(giphy_client_mock):
+        response = await client.get('/')
+
+    assert response.status == 200
+    data = await response.json()
+    assert data['gifs'] == []
+
+
+async def test_index_default_params(client, app):
+    giphy_client_mock = mock.AsyncMock(spec=GiphyClient)
+    giphy_client_mock.search.return_value = {
+        'data': [],
+    }
+
+    with app.container.giphy_client.override(giphy_client_mock):
+        response = await client.get('/')
+
+    assert response.status == 200
+    data = await response.json()
+    assert data['query'] == app.container.config.search.default_query()
+    assert data['limit'] == app.container.config.search.default_limit()

examples/miniapps/giphynav-aiohttp/giphynavigator/views.py

@@ -0,0 +1,25 @@
+"""Views module."""
+
+from aiohttp import web
+
+from .services import SearchService
+
+
+async def index(
+        request: web.Request,
+        search_service: SearchService,
+        default_query: str,
+        default_limit: int,
+) -> web.Response:
+    query = request.query.get('query', default_query)
+    limit = int(request.query.get('limit', default_limit))
+
+    gifs = await search_service.search(query, limit)
+
+    return web.json_response(
+        {
+            'query': query,
+            'limit': limit,
+            'gifs': gifs,
+        },
+    )

examples/miniapps/giphynav-aiohttp/requirements.txt

@@ -0,0 +1,6 @@
+dependency-injector
+aiohttp
+aiohttp-devtools
+pyyaml
+pytest-aiohttp
+pytest-cov

requirements-ext.txt

@@ -1 +1,2 @@
 flask
+aiohttp

setup.py

@@ -67,6 +67,9 @@ setup(name='dependency-injector',
           'flask': [
               'flask',
           ],
+          'aiohttp': [
+              'aiohttp',
+          ],
       },
       zip_safe=True,
       license='BSD New',

src/dependency_injector/ext/aiohttp.py

@@ -0,0 +1,46 @@
+"""Aiohttp extension module."""
+
+from __future__ import absolute_import
+
+import functools
+
+from dependency_injector import providers
+
+
+class Application(providers.Singleton):
+    """Aiohttp application provider."""
+
+
+class Extension(providers.Singleton):
+    """Aiohttp extension provider."""
+
+
+class Middleware(providers.DelegatedCallable):
+    """Aiohttp middleware provider."""
+
+    __middleware_version__ = 1
+
+
+class MiddlewareFactory(providers.Factory):
+    """Aiohttp middleware factory provider."""
+
+
+class View(providers.Callable):
+    """Aiohttp view provider."""
+
+    def as_view(self):
+        """Return aiohttp view function."""
+        @functools.wraps(self.provides)
+        async def _view(request, *args, **kwargs):
+            return await self.__call__(request, *args, **kwargs)
+        return _view
+
+
+class ClassBasedView(providers.Factory):
+    """Aiohttp class-based view provider."""
+
+    def as_view(self):
+        """Return aiohttp view function."""
+        async def _view(request, *args, **kwargs):
+            return await self.__call__(request, *args, **kwargs)
+        return _view

tests/unit/ext/test_aiohttp_py35.py

@@ -0,0 +1,93 @@
+"""Dependency injector Aiohttp extension unit tests."""
+
+from aiohttp import web
+from aiohttp.test_utils import AioHTTPTestCase, unittest_run_loop
+
+from dependency_injector import containers, providers
+from dependency_injector.ext import aiohttp
+
+
+async def index(_):
+    return web.Response(text='Hello World!')
+
+
+async def test(_):
+    return web.Response(text='Test!')
+
+
+class Test(web.View):
+    async def get(self):
+        return web.Response(text='Test class-based!')
+
+
+@web.middleware
+async def middleware(request, handler):
+    resp = await handler(request)
+    resp.text = resp.text + ' wink1'
+    return resp
+
+
+def middleware_factory(text):
+    @web.middleware
+    async def sample_middleware(request, handler):
+        resp = await handler(request)
+        resp.text = resp.text + text
+        return resp
+    return sample_middleware
+
+
+class ApplicationContainer(containers.DeclarativeContainer):
+
+    app = aiohttp.Application(
+        web.Application,
+        middlewares=providers.List(
+            aiohttp.Middleware(middleware),
+            aiohttp.MiddlewareFactory(middleware_factory, text=' wink2'),
+        ),
+    )
+
+    index_view = aiohttp.View(index)
+    test_view = aiohttp.View(test)
+    test_class_view = aiohttp.ClassBasedView(Test)
+
+
+class ApplicationTests(AioHTTPTestCase):
+
+    async def get_application(self):
+        """
+        Override the get_app method to return your application.
+        """
+        container = ApplicationContainer()
+        app = container.app()
+        app.container = container
+        app.add_routes([
+            web.get('/', container.index_view.as_view()),
+            web.get('/test', container.test_view.as_view(), name='test'),
+            web.get('/test-class', container.test_class_view.as_view()),
+        ])
+        return app
+
+    @unittest_run_loop
+    async def test_index(self):
+        response = await self.client.get('/')
+
+        self.assertEqual(response.status, 200)
+        self.assertEqual(await response.text(), 'Hello World! wink2 wink1')
+
+    @unittest_run_loop
+    async def test_test(self):
+        response = await self.client.get('/test')
+
+        self.assertEqual(response.status, 200)
+        self.assertEqual(await response.text(), 'Test! wink2 wink1')
+
+    @unittest_run_loop
+    async def test_test_class_based(self):
+        response = await self.client.get('/test-class')
+
+        self.assertEqual(response.status, 200)
+        self.assertEqual(await response.text(), 'Test class-based! wink2 wink1')
+
+    @unittest_run_loop
+    async def test_endpoints(self):
+        self.assertEqual(str(self.app.router['test'].url_for()), '/test')

tests/unit/ext/test_flask_py2_py3.py

@@ -4,7 +4,7 @@ import unittest2 as unittest
 from flask import Flask, url_for
 from flask.views import MethodView
 
-from dependency_injector import containers, providers
+from dependency_injector import containers
 from dependency_injector.ext import flask
 
 

tests/unit/providers/test_coroutines_py35.py

@@ -1,6 +1,9 @@
 """Dependency injector coroutine providers unit tests."""
 
 import asyncio
+import contextlib
+import sys
+import gc
 
 import unittest2 as unittest
 
@@ -10,20 +13,65 @@ from dependency_injector import (
 )
 
 
-@asyncio.coroutine
+async def _example(arg1, arg2, arg3, arg4):
-def _example(arg1, arg2, arg3, arg4):
     future = asyncio.Future()
     future.set_result(None)
-    yield from future
+    await future
     return arg1, arg2, arg3, arg4
 
 
-def _run(coro):
+def run(main):
     loop = asyncio.get_event_loop()
-    return loop.run_until_complete(coro)
+    return loop.run_until_complete(main)
 
 
-class CoroutineTests(unittest.TestCase):
+def setup_test_loop(
+        loop_factory=asyncio.new_event_loop
+) -> asyncio.AbstractEventLoop:
+    loop = loop_factory()
+    try:
+        module = loop.__class__.__module__
+        skip_watcher = 'uvloop' in module
+    except AttributeError:  # pragma: no cover
+        # Just in case
+        skip_watcher = True
+    asyncio.set_event_loop(loop)
+    if sys.platform != "win32" and not skip_watcher:
+        policy = asyncio.get_event_loop_policy()
+        watcher = asyncio.SafeChildWatcher()  # type: ignore
+        watcher.attach_loop(loop)
+        with contextlib.suppress(NotImplementedError):
+            policy.set_child_watcher(watcher)
+    return loop
+
+
+def teardown_test_loop(loop: asyncio.AbstractEventLoop,
+                       fast: bool=False) -> None:
+    closed = loop.is_closed()
+    if not closed:
+        loop.call_soon(loop.stop)
+        loop.run_forever()
+        loop.close()
+
+    if not fast:
+        gc.collect()
+
+    asyncio.set_event_loop(None)
+
+
+class AsyncTestCase(unittest.TestCase):
+
+    def setUp(self):
+        self.loop = setup_test_loop()
+
+    def tearDown(self):
+        teardown_test_loop(self.loop)
+
+    def _run(self, f):
+        return self.loop.run_until_complete(f)
+
+
+class CoroutineTests(AsyncTestCase):
 
     def test_init_with_coroutine(self):
         self.assertTrue(providers.Coroutine(_example))
@@ -33,34 +81,34 @@ class CoroutineTests(unittest.TestCase):
 
     def test_call_with_positional_args(self):
         provider = providers.Coroutine(_example, 1, 2, 3, 4)
-        self.assertTupleEqual(_run(provider()), (1, 2, 3, 4))
+        self.assertTupleEqual(self._run(provider()), (1, 2, 3, 4))
 
     def test_call_with_keyword_args(self):
         provider = providers.Coroutine(_example,
                                        arg1=1, arg2=2, arg3=3, arg4=4)
-        self.assertTupleEqual(_run(provider()), (1, 2, 3, 4))
+        self.assertTupleEqual(self._run(provider()), (1, 2, 3, 4))
 
     def test_call_with_positional_and_keyword_args(self):
         provider = providers.Coroutine(_example,
                                        1, 2,
                                        arg3=3, arg4=4)
-        self.assertTupleEqual(_run(provider()), (1, 2, 3, 4))
+        self.assertTupleEqual(run(provider()), (1, 2, 3, 4))
 
     def test_call_with_context_args(self):
         provider = providers.Coroutine(_example, 1, 2)
-        self.assertTupleEqual(_run(provider(3, 4)), (1, 2, 3, 4))
+        self.assertTupleEqual(self._run(provider(3, 4)), (1, 2, 3, 4))
 
     def test_call_with_context_kwargs(self):
         provider = providers.Coroutine(_example, arg1=1)
         self.assertTupleEqual(
-            _run(provider(arg2=2, arg3=3, arg4=4)),
+            self._run(provider(arg2=2, arg3=3, arg4=4)),
             (1, 2, 3, 4),
         )
 
     def test_call_with_context_args_and_kwargs(self):
         provider = providers.Coroutine(_example, 1)
         self.assertTupleEqual(
-            _run(provider(2, arg3=3, arg4=4)),
+            self._run(provider(2, arg3=3, arg4=4)),
             (1, 2, 3, 4),
         )
 
@@ -69,7 +117,7 @@ class CoroutineTests(unittest.TestCase):
             .add_args(1, 2) \
             .add_kwargs(arg3=3, arg4=4)
 
-        self.assertTupleEqual(_run(provider()), (1, 2, 3, 4))
+        self.assertTupleEqual(self._run(provider()), (1, 2, 3, 4))
 
     def test_set_args(self):
         provider = providers.Coroutine(_example) \
@@ -213,7 +261,7 @@ class DelegatedCoroutineTests(unittest.TestCase):
                              hex(id(provider))))
 
 
-class AbstractCoroutineTests(unittest.TestCase):
+class AbstractCoroutineTests(AsyncTestCase):
 
     def test_inheritance(self):
         self.assertIsInstance(providers.AbstractCoroutine(_example),
@@ -227,7 +275,7 @@ class AbstractCoroutineTests(unittest.TestCase):
         provider = providers.AbstractCoroutine(_abstract_example)
         provider.override(providers.Coroutine(_example))
 
-        self.assertTrue(_run(provider(1, 2, 3, 4)), (1, 2, 3, 4))
+        self.assertTrue(self._run(provider(1, 2, 3, 4)), (1, 2, 3, 4))
 
     def test_call_overridden_by_delegated_coroutine(self):
         @asyncio.coroutine
@@ -237,7 +285,7 @@ class AbstractCoroutineTests(unittest.TestCase):
         provider = providers.AbstractCoroutine(_abstract_example)
         provider.override(providers.DelegatedCoroutine(_example))
 
-        self.assertTrue(_run(provider(1, 2, 3, 4)), (1, 2, 3, 4))
+        self.assertTrue(self._run(provider(1, 2, 3, 4)), (1, 2, 3, 4))
 
     def test_call_not_overridden(self):
         provider = providers.AbstractCoroutine(_example)

tox.ini

@@ -8,12 +8,13 @@ deps=
 extras=
     yaml
     flask
+    aiohttp
 commands=
-    unit2 discover -s tests/unit -p test_*_py3.py
+    unit2 discover -s tests/unit -p test_*_py3*.py
 
 [testenv:coveralls]
 passenv=TRAVIS TRAVIS_JOB_ID TRAVIS_BRANCH DEPENDENCY_INJECTOR_DEBUG_MODE
-basepython=python3.6
+basepython=python3.8
 usedevelop=True
 deps=
     {[testenv]deps}
@@ -22,19 +23,27 @@ deps=
     coveralls
 commands=
     coverage erase
-    coverage run --rcfile=./.coveragerc -m unittest2 discover -s tests/unit/ -p test_*_py3.py
+    coverage run --rcfile=./.coveragerc -m unittest2 discover -s tests/unit/ -p test_*_py35.py
     coverage report --rcfile=./.coveragerc
     coveralls
 
 [testenv:py27]
+extras=
+    yaml
+    flask
 commands=
     unit2 discover -s tests/unit -p test_*_py2_py3.py
 
 [testenv:py34]
+commands=
+    unit2 discover -s tests/unit -p test_*_py3.py
 extras=
     flask
 
 [testenv:pypy]
+extras=
+    yaml
+    flask
 commands=
     unit2 discover -s tests/unit -p test_*_py2_py3.py