Setting Environment Proxy (HTTP_PROXY etc.) breaks Some Tests

[scirelli]

🐞 Describe the bug

Tests break when proxy environment variables (HTTP_PROXY, HTTPS_PROXY, etc.) are set.

💡 To Reproduce

export http_proxy='http://www.example.com,http://proxy.com'
make test

💡 Expected behavior

Tests should pass.

📋 Logs/tracebacks

FAILED tests/test_helpers.py::test_proxies_from_env[https] - AssertionError: assert dict_keys(['http', 'https']) == {'https'}
FAILED tests/test_helpers.py::test_proxies_from_env[ws] - AssertionError: assert dict_keys(['http', 'ws']) == {'ws'}
FAILED tests/test_helpers.py::test_proxies_from_env[wss] - AssertionError: assert dict_keys(['http', 'wss']) == {'wss'}
FAILED tests/test_helpers.py::test_proxies_from_env_skipped[https] - AssertionError: assert {'http': ProxyInfo(proxy=URL('http://www.example.com,http//proxy.com'), proxy_auth=None)} == {}
FAILED tests/test_helpers.py::test_proxies_from_env_skipped[wss] - AssertionError: assert {'http': ProxyInfo(proxy=URL('http://www.example.com,http//proxy.com'), proxy_auth=None)} == {}

📋 Your version of the Python

$ python --version
Python 3.8.7

📋 Your version of the aiohttp/yarl/multidict distributions

$ python -m pip show aiohttp
Name: aiohttp
Version: 4.0.0a1
Summary: Async http client/server framework (asyncio)
Home-page: https://github.com/aio-libs/aiohttp
Author: Nikolay Kim
Author-email: fafhrd91@gmail.com
License: Apache 2
Location: /Users/cirelli/Projects/aiohttp
Requires: chardet, multidict, async-timeout, yarl, typing-extensions, frozenlist, aiosignal
Required-by: 

$ python -m pip show multidict
Name: multidict
Version: 5.1.0
Summary: multidict implementation
Home-page: https://github.com/aio-libs/multidict
Author: Andrew Svetlov
Author-email: andrew.svetlov@gmail.com
License: Apache 2
Location: /Users/cirelli/Projects/aiohttp/.venv/lib/python3.8/site-packages
Requires: 
Required-by: yarl, aiohttp

$ python -m pip show yarl
Name: yarl
Version: 1.6.3
Summary: Yet another URL library
Home-page: https://github.com/aio-libs/yarl/
Author: Andrew Svetlov
Author-email: andrew.svetlov@gmail.com
License: Apache 2
Location: /Users/cirelli/Projects/aiohttp/.venv/lib/python3.8/site-packages
Requires: idna, multidict
Required-by: aiohttp

📋 Additional context

Mac OS

[webknjaz]

That's unfortunate... Mind submitting a PR?

[scirelli]

Sure, I mentioned it in my last PR that I'd create a new one to fix it. I figured it required a new PR.

[webknjaz]

Ah, I somehow missed that.. Thanks!

[webknjaz]

Implemented by #5557 and #6184.