No obvious way to set self.maxDiff with pytest_django.asserts

[r-thomson]

When using pytest_django.asserts.assertXMLEqual, the diff in the console is truncated, with the following message at the end:

Diff is ### characters long. Set self.maxDiff to None to see it.

It's not obvious to me what the right way to accomplish this with pytest-django is, since the TestCase for these functions is defined internally. Right now I'm just monkeypatching unittest.case.TestCase.maxDiff, but it'd be nice to have an obvious way of doing this.

[bluetech]

Hmm, thanks for the issue. I figure we should plumb the pytest verbosity options into maxDiff.

[bluetech]

Looked into it. Unfortunately what the way pytest_django.asserts is currently implemented, the assertion functions are just standalone functions, and are not bound to the actual running test. I don't see a way to implement this without a lot of complexity, sorry. I suggest switching to plain assert if possible.

[r-thomson]

From looking at the source, it looks like a TestCase is instantiated here:

pytest-django/pytest_django/asserts.py

Line 25 in d8dc3d9

test_case = TestCase("run")

Is it not possible at this location to check some global configuration, e.g. the pytest verbosity?

[roniemartinez]

We can temporarily monkey-patch this in conftest.py but looks like an ugly solution

# top of conftest.py
import unittest

unittest.TestCase.maxDiff = None


# ... all other imports here