>>> from should_dsl import *

>>> ('spec' is not 'SPEC') |should_be| True
True
>>> ('spec' is not 'SPEC') |should_not_be| True
Traceback (most recent call last):
    ...
ShouldNotSatisfied: True is True

>>> ('spec' is 'SPEC') |should_be| True
Traceback (most recent call last):
    ...
ShouldNotSatisfied: False is not True
