Python testing properties using partial

Question

I have a mock object for following class

class Book(object):

    def __init__(self):
        self._counter = 1

    @property
    def counter(self):
        _, self._counter = self._counter, self._counter + 1 
        return _

the class Book have following Mock object

book = Mock(spec = Book, self._counter = 1)

if counter is not a property I could have written test as such

def test_counter(self):
    book.counter = partial(Book.counter, book)
    self.assertNotEquals(book.counter(), book.counter())

however since it is a property, the above strategy won't work, can you suggest a good way to write test for the property given I have to use Mock object for Book class.

Ankur · Accepted Answer · 2014-06-23 07:20:48Z

1

def test_counter(self):
    book.counter = partial(Book.counter.fget, book)
    self.assertNotEquals(book.counter(), book.counter())

answered Jun 23, 2014 at 7:20

Ankur

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2 Comments

Vaibhav Mishra Over a year ago

Can you explain your answer a little bit.

Ankur Over a year ago

Actually the @property decorator returns a property object which has a fget function to actually run the underlying function on which decorator was applied

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