createMock(\Magento\Framework\Config\FileIteratorFactory::class); $dirSearch = $this->createMock(\Magento\Framework\Component\DirSearch::class); $model = new \Magento\Email\Model\Template\Config\FileResolver($fileIteratorFactory, $dirSearch); $expected = ['found_file']; $fileIteratorFactory->expects($this->once()) ->method('create') ->will($this->returnValue($expected)); $dirSearch->expects($this->once()) ->method('collectFiles') ->with(ComponentRegistrar::MODULE, 'etc/file'); $model->get('file', 'scope'); } }