Eko\FeedBundle\Tests\Formatter\AtomFormatterTest::testAddCustomItemFieldWithItemInterface PHP Method

    public function testAddCustomItemFieldWithItemInterface()
    {
        $feed = $this->manager->get('article');
        $feed->add(new FakeItemInterfaceEntity());
        $feed->addItemField(new ItemField('fake_custom', 'getFeedItemCustom'));
        $output = $feed->render('atom');
        $this->assertContains('<fake_custom>My custom field</fake_custom>', $output);
    }