import nose
import buggy_functions

def test_is_lowercase_empty():
    assert buggy_functions.is_lowercase(""), "The empty string"
    
def test_is_lowercase_correct():
    assert buggy_functions.is_lowercase("abcdef"), "Lowercase string"
    
def test_is_lowercase_nonletter():
    assert not buggy_functions.is_lowercase("a123.,!a"), \
    "Non-alphabetic string"
    
def test_is_lowercase_uppercase():
    assert not buggy_functions.is_lowercase("abCdef"), "Uppercase string" 

if __name__ == '__main__':
    nose.runmodule()