def test_domain_is_email():
assert not validate_string.is_domain("*****@*****.**")
def test_domain_length_is_less_or_equal_253():
long_domain = "nqnwsjlgxuywzojugeagcfbphrvgacffmuqppnehpzenoixzplrwmhisoytxfgsbarqgrcgqqblyhrdxfqzeirzojyrgjtbfapnzkguqzhyuirazmymxakypbwulmuxcjcfxkhgcgbivohcbxvvkgczaqdoekepwzcxkciwjdpkrdaqdywezqauskkfhmgjubmxhddcbqjvimeqfgjnwhxeufqamrlfxddmlkeonbwmwiypnknmqbclsgm.tlo"
assert not validate_string.is_domain(long_domain)
def test_domain_without_protocol():
assert not validate_string.is_domain("http://example.com")
def test_domain_ending_with_non_char():
assert not validate_string.is_domain("example.com@")
def test_domain_starting_with_non_char():
assert not validate_string.is_domain("-example.com")
def test_valid_domain_with_dash():
assert validate_string.is_domain("some-example.com")
def test_valid_subdomain():
assert validate_string.is_domain("sub.example.com")