def test_unamef4(): assert isValidUser('format C:') == False
def test_unamef3(): assert isValidUser( 'this-is-a-super-creative-name-for-github-user') == False
def test_unamef(): assert isValidUser('user--123') == False
def test_unamef3(): assert isValidUser('-user123-') == False
def test_uname2(): assert isValidUser('user-123') == True