get( \Magento\Framework\View\LayoutInterface::class ); $block = $layout->createBlock(\Magento\Shipping\Block\Items::class, 'block'); $childBlock = $layout->addBlock(\Magento\Framework\View\Element\Text::class, 'shipment_comments', 'block'); $shipment = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()->create( \Magento\Sales\Model\Order\Shipment::class ); $expectedHtml = 'Any html'; $this->assertEmpty($childBlock->getEntity()); $this->assertEmpty($childBlock->getTitle()); $this->assertNotEquals($expectedHtml, $block->getCommentsHtml($shipment)); $childBlock->setText($expectedHtml); $actualHtml = $block->getCommentsHtml($shipment); $this->assertSame($shipment, $childBlock->getEntity()); $this->assertNotEmpty($childBlock->getTitle()); $this->assertEquals($expectedHtml, $actualHtml); } }