def test_empty_string(self):
data = ''
result = palindrome_permutation(data)
self.assertEqual(result, True)
def test_permutated_palindrome(self):
data = 'race rac'
result = palindrome_permutation(data)
self.assertEqual(result, True)
def test_all_identical_characters_in_string(self):
data = 'AaaaAa'
result = palindrome_permutation(data)
self.assertEqual(result, True)
def test_unbalanced_characters_in_valid_string(self):
data = 'aaa aa'
result = palindrome_permutation(data)
self.assertEqual(result, True)
def test_case_insensitive_permutation(self):
data = 'Hello OlLhE'
result = palindrome_permutation(data)
self.assertEqual(result, True)