def test_check_key_not_exist():
with patch('modelo.pastas.find_one') as p:
p.return_value=None
eq_(modelo.check_key(1,2), True)
def test_check_key_exist():
with patch('modelo.pastas.find_one') as p:
p.return_value=1 # not none
eq_(modelo.check_key(1,2), False)