ENH/TST: Doctest narrative documentation

[bsipocz]

I can't yet claim to have any detailed oversight of the testing infrastructure of numpy, it definitely seems that a number of narrative documentations are not tested yet, e.g. here:
doc/source/reference/.

I've tried to force doctest to pick up those tests, but so far it's without much success. I got to the point with pytest-doctest that the files are found, but for some reasons there are still deselected.

$ ~/munka/devel/numpy [doc_ma_generic L|✚ 2…1⚑ 1] $ pytest -m doctest doc/source/reference/ --doctest-rst
================================================= test session starts ==================================================
platform darwin -- Python 3.7.4, pytest-5.2.0, py-1.8.0, pluggy-0.12.0
rootdir: /Users/bsipocz/munka/devel/numpy, inifile: pytest.ini
plugins: xdist-1.29.0, forked-1.0.2, arraydiff-0.3, xonsh-0.8.3, dependency-0.4.0, remotedata-0.3.2, doctestplus-0.4.0, openfiles-0.4.0, asdf-2.4.2, cov-2.8.1, requests-mock-1.6.0
collected 89 items / 89 deselected   

[mattip]

We use python runtests.py --recheck-guide to do doctest testing

[bsipocz]

yes, but that is not testing stuff in doc/source/reference/

[mattip]

are there docstrings there? I think the examples in the rst files are run by sphinx, that is how the plots are created here

[bsipocz]

yes, there are plenty of them, and a few issues opened about code examples that doesn't work, e.g. here:
https://docs.scipy.org/doc/numpy/reference/maskedarray.generic.html

I'm in the middle to clean up that page, but it's just symptomatic treatment until the doctests are picking those pages up automatically

[mattip]

Superceded by gh-14970, now that refguide-check can test snippets in RST documenation.
Please reopen if I missed something.