Condition out complex variable tests on mips64el

[eddelbuettel]

Is your feature request related to a problem? Please describe.

The platform Debian describes as 'mips64el', ie little endian mips64, has been seen failing its units tests for complex variables.

Describe the solution you'd like

A patch has been added to the Debian package I could PR here as well, it uses

@pytest.mark.skipif(platform.machine() == 'mips64' and sys.byteorder == 'little',
                    reason="Complex tests fail for 'mips64el'.")

to skip the few tests seen as failing.

Describe alternatives you've considered

We could keep the patch local to the Debian packaging but that is not a good long-term approach.

Additional context

N/A

[lgautier]

I am happy to review and merge a PR in that sense. My first thought if is that I'd prefer pytest.mark.xfail to pytest.mark.skipif.

[eddelbuettel]

Good to know -- 'skipif' was what the not-so-deep-into-Python-person that I am found first. But I have now heard from a Debian porter so maybe we will even get it addressed at the source.

For eyeballing the patch is here (and has at the very end the other little bit of silencing the timezone test we saw fail earlier):
https://sources.debian.org/src/rpy2/3.5.13-5/debian/patches/skip_complex_tests_on_mips64el/