[issue39129] Incorrect import of TimeoutError while creating happy eyeballs connection

[Andrew Svetlov]

Andrew Svetlov <andrew.svetlov at gmail.com> added the comment:

The main problem of mock-based tests in asyncio is that the tests become unreliably very easy after mocked asyncio internal changes.

I'm +0 on adding the proposed test. The better idea is serving on explicit AF_INET '127.0.0.1:<port>' address when the connection is established to AF_INET6 '[::1]:<port>'.

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<https://bugs.python.org/issue39129>
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