def test_repository_find_empty():
r = Repository()
bk = Book('TITLE', 'DESCRIPTION', 'ISBN')
r.store(bk)
bk = Book('TITLE2', 'DESCRIPTION2', 'ISBN2')
r.store(bk)
bk = Book('TITLE3', 'DESCRIPTION3', 'ISBN3')
r.store(bk)
books = r.find()
assert_equals(len(books), 3)
def test_repository_find_nonempty():
r = Repository()
books = r.find()
assert_equals(len(books), 0)
