Compatibility of terminal summary hook with pytest<4.2

[prs513rosewood]

Hello!

Pytest 4.2 introduced the config argument to
pytest_terminal_summary, which is not backwards compatible.

I added a flag that is initialized when the hook pytest_configure is called, which is then used in the pytest_terminal_summary instead of the previous config argument. I tried with versions 3.10.1 and 5.4.2 on a homegrown test and it works. I am unfamiliar with tox, but I think it would be best if several versions of pytest were tested.

Fixes #3

By the way, the version on pypi is out of date with respect to bugfixes on min_size for mpi tests.

Cheers!

[codecov]

Codecov Report

Merging #5 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master        #5   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines          113       116    +3     
=========================================
+ Hits           113       116    +3     

Impacted Files	Coverage Δ
pytest_mpi/__init__.py	100.00% <100.00%> (ø)

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[prs513rosewood]

Hi @aragilar,

Just a reminder that this PR exists. I saw that pytest-mpi was in the Debian unstable repositories (cf. here). If this PR is merged, there would be a possibility of having the package in the backports repositories, as this PR makes it compatible with current Debian stable.

[aragilar]

Oops, sorry I missed this, I'll try to get to this later today and release it on PyPI.

[aragilar]

bors r+

[bors]

Build succeeded:

• continuous-integration/travis-ci/push