def test_the_same_string():
assert check_permutation('a', 'a') == True
assert check_permutation('ab', 'ab') == True
def test_strings_different_lengths():
assert check_permutation('a', 'bc') == False
assert check_permutation('ab', 'abc') == False
assert check_permutation('ab', 'xyz') == False
def test_empty_string():
assert check_permutation('', 'a') == False
assert check_permutation('', 'ab') == False
assert check_permutation('', '') == True
def test_non_permutations():
assert check_permutation('a', 'b') == False
assert check_permutation('ab', 'cd') == False
assert check_permutation('ab', 'bc') == False
def test_permutation_of_three_chars():
assert check_permutation('abc', 'bca') == True
assert check_permutation('abc', 'bac') == True
assert check_permutation('abc', 'acb') == True
assert check_permutation('abc', 'cab') == True
assert check_permutation('abc', 'cba') == True
def test_permutation_of_two_chars():
assert check_permutation('ab', 'ba') == True