[TIP] doctest fixtures in nose

[Barry Warsaw]

nose is great, and its support for doctests is pretty good.

However, I'd like to improve one aspect of doctest support, namely fixtures.
The doctest plugin has this option:

--doctest-fixtures=SUFFIX
    Find fixtures for a doctest file in module with this name appended to the
    base name of the doctest file

This doesn't work so well when you have one generic fixture for a few hundred
doctests. ;)

I opened this issue in nose's tracker:

https://github.com/nose-devs/nose/issues/594

and my thoughts were to add a --doctest-fixture (singular) option which would
name a module using dotted-notation that would be the generic fixture.  So
e.g. I could add:

--doctest-fixture=mypackage.subpkg.testing.doctest_fixture

and nose would import that module as the fixture (i.e. it would be on
sys.path).  I suggest allowing --doctest-fixtures (plural) to still allow for
overriding doctest fixtures on a per-doctest basis.

Thoughts?

Cheers,
-Barry
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