Add assertFloatsAreIdentical/assertComplexAreIdentical to unittest (or kwarg to assertEqual)?

[skirpichev]

Feature or enhancement

Proposal:

Clones of assertFloatsAreIdentical() are scattered across the CPython tests:

cpython/Lib/test/test_complex.py

Line 74 in d8f8243

def assertFloatsAreIdentical(self, x, y):

cpython/Lib/test/test_cmath.py

Line 68 in d8f8243

def assertFloatIdentical(self, x, y):

cpython/Lib/test/test_float.py

Line 1069 in d8f8243

def identical(self, x, y):

cpython/Lib/test/test_capi/test_getargs.py

Line 440 in d8f8243

def assertEqualWithSign(self, actual, expected):

Maybe it's worth to have a dedicated check?

Or a special kwarg for the assertEqual method, to workaround NAN and -0.0 values for floats/complexes.

Edit:

Or at least some support from Lib/test/support... I was adding similar helper yet in another test file and that looks odd.

Numpy has numpy.testing.assert_equal():

>>> np.testing.assert_equal([0.0], [+0.0])
>>> np.testing.assert_equal([0.0], [-0.0])
Traceback (most recent call last):
  ...
AssertionError: 
Items are not equal:
item=0

 ACTUAL: 0.0
 DESIRED: -0.0
>>> np.testing.assert_equal([np.nan], [np.nan])
>>> np.testing.assert_equal([0.0], [np.nan])
Traceback (most recent call last):
  ...
AssertionError: 
Items are not equal:
item=0

 ACTUAL: 0.0
 DESIRED: nan

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

No response

Linked PRs

• gh-121039: add Floats/ComplexesAreIdenticalMixin to test.support.testcase #121071

[skirpichev]

pr is ready: #121071 (it implements the last option: methods added to test.support)