Crunchy Frog Doctest Test

Here's a Doctest box:

>>> p = Animal('Pooh')
>>> p.name
'Pooh'
>>> p.addFriend('Piglet')
>>> p.friends
['Piglet']

This should generate a syntax error:

class Animal():
    pass

This should compile but not satisfy the doctest:

class Animal:
    pass

And this should work:

class Animal:
    def __init__(self, name):
        self.name = name
        self.friends = []
    def addFriend(self, friend):
        self.friends.append(friend)

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