def test_common_prefix(): """Test common prefix length of two strings.""" assert utils.common_prefix_length('abcd', 'abce') == 3
def test_differ_length(): """Test common prefix length of two strings differing in length.""" assert utils.common_prefix_length('abcd', 'ab') == 2
def test_empty_string(): """Test common prefix length of two strings, one of them empty.""" assert utils.common_prefix_length('abcd', '') == 0
def test_no_common_prefix(): """Test common prefix length of two strings that have no common prefix.""" assert utils.common_prefix_length('abcd', 'cdef') == 0