def test_two_chars():
assert reverse('ab') == 'ba'
def test_single_char():
assert reverse('a') == 'a'
def test_even_len():
assert reverse('abcdef') == 'fedcba'
def test_unicode_chars():
assert reverse(u"<💩><👽>") == u">\U0001F47D<>\U0001F4A9<"
def test_odd_len():
assert reverse('abcde') == 'edcba'