Use unittest.mock if is only aviable

[mimi1vx]

from Python 3.3 is mock part of python standard library in unittest namespace

Thanks for submitting a PR, your contribution is really appreciated!

• Target the master branch for bug fixes, documentation updates and trivial changes.
• Include new tests or update existing tests when applicable.
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[coveralls]

Coverage increased (+0.05%) to 92.638% when pulling cd07c4d on mimi1vx:test_mock into 2137e2b on pytest-dev:master.

[wimglenn]

Preferably other way around, no? (try stdlib import first, else fallback to mock from pypi)

[nicoddemus]

TBH I'm not sure why this is needed, after all the recommended way to run the tests using tox, which install the appropriate dependencies.

[mimi1vx]

@nicoddemus because mock package isn't needed on modern python, so some distributions stop providing it for python3.

and for example, openSUSE run testsuite during package build

plus is +- same commit as #3612

[mimi1vx]

@wimglenn in past was requested first mock and if isnt installed use stdlib. ( mock package is still devel package for stdlib)

[asottile]

Here's the context for that comment btw: #3612 (comment)

(also I've seen from unittest import mock more commonly than import unittest.mock as mock -- they do the same thing so nbd)

[nicoddemus]

@nicoddemus because mock package isn't needed on modern python, so some distributions stop providing it for python3.

Ah OK, that makes sense, thanks for the context. 👍