Funk 0.4.0

Installation

$ pip install funk

Example

Let’s say we have a TagRepository class, which has a fetch_all method on it. This method will fetch all instances of Tag from the database for us.

We also have a class that we’d like to test, called TagDisplayer. Its constructor takes a TagRepository, and has a method display_all. We want to test that this method will grab all of the tags from the repository, sort them into alphabetical order, and write their names into a string separated by new lines.

from nose.tools import assert_equals
import funk
from funk import expects

@funk.with_mocks
def test_writes_all_tag_names_onto_separate_lines(mocks):
    tag_repository = mocks.mock(TagRepository)

    expects(tag_repository).fetch_all(sorted=False)
        .returns([Tag('python'), Tag('debian')])

    tag_displayer = TagDisplayer(tag_repository)
    assert_equals(tag_displayer.display_all(), 'python\ndebian')

By using a mock object instead of a real instance of TagRepository, we avoid relying on a correct implementation of TagRepository. We can also run the test without a running database.