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import unittest

import warnings

from can.util import _rename_kwargs

class RenameKwargsTest(unittest.TestCase):

expected_kwargs = dict(a=1, b=2, c=3, d=4)

def _test(self, kwargs, aliases):

# Test that we do get the DeprecationWarning when called with deprecated kwargs

with self.assertWarnsRegex(DeprecationWarning, "is deprecated"):

_rename_kwargs("unit_test", kwargs, aliases)

# Test that the aliases contains the deprecated values and

# the obsolete kwargs have been removed

assert kwargs == self.expected_kwargs

# Test that we do not get a DeprecationWarning when we call

# without deprecated kwargs

# Cause all warnings to always be triggered.

warnings.simplefilter("error", DeprecationWarning)

try:

_rename_kwargs("unit_test", kwargs, aliases)

finally:

warnings.resetwarnings()

def test_rename(self):

kwargs = dict(old_a=1, old_b=2, c=3, d=4)

aliases = {"old_a": "a", "old_b": "b"}

self._test(kwargs, aliases)

def test_obsolete(self):

kwargs = dict(a=1, b=2, c=3, d=4, z=10)

aliases = {"z": None}

self._test(kwargs, aliases)

def test_rename_and_obsolete(self):

kwargs = dict(old_a=1, old_b=2, c=3, d=4, z=10)

aliases = {"old_a": "a", "old_b": "b", "z": None}

self._test(kwargs, aliases)

def test_with_new_and_alias_present(self):

kwargs = dict(old_a=1, a=1, b=2, c=3, d=4, z=10)

aliases = {"old_a": "a", "old_b": "b", "z": None}

with self.assertRaises(TypeError):

self._test(kwargs, aliases)