def test_book_exists_returns_true(self):
conn = self.setup_mock([1])
a = FormatExists(conn)
self.assertTrue(a.execute(book_id=1, book_format="epub"))
def test_book_does_not_exist_return_false(self):
conn = self.setup_mock([])
a = FormatExists(conn)
self.assertFalse(a.execute(book_id=1, book_format="epub"))