storage = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()->create( \Magento\Theme\Model\Design\Config\Storage::class ); } /** * Test design/header/welcome if it is saved in db as empty(null) it should be shown on backend as empty. * * @magentoDataFixture Magento/Theme/_files/config_data.php */ public function testLoad() { $data = $this->storage->load('stores', 1); foreach ($data->getExtensionAttributes()->getDesignConfigData() as $configData) { if ($configData->getPath() == 'design/header/welcome') { $this->assertSame('', $configData->getValue()); } } } }