get( \Magento\Framework\View\LayoutInterface::class ); // Create block with blocking _prepateLayout(), which is used by block to instantly add 'form' child /** @var $block \Magento\Backend\Block\Widget\Form\Container */ $block = $this->getMockBuilder(\Magento\Backend\Block\Widget\Form\Container::class) ->onlyMethods(['_prepareLayout']) ->setConstructorArgs([$objectManager->create(\Magento\Backend\Block\Widget\Context::class)]) ->getMock(); $layout->addBlock($block, 'block'); $form = $layout->addBlock(\Magento\Framework\View\Element\Text::class, 'form', 'block'); $expectedHtml = 'html'; $this->assertNotEquals($expectedHtml, $block->getFormHtml()); $form->setText($expectedHtml); $this->assertEquals($expectedHtml, $block->getFormHtml()); } public function testPseudoConstruct() { /** @var $block \Magento\Backend\Block\Widget\Form\Container */ $block = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()->get( \Magento\Framework\View\LayoutInterface::class )->createBlock( \Magento\Backend\Block\Widget\Form\Container::class, '', [ 'data' => [ \Magento\Backend\Block\Widget\Container::PARAM_CONTROLLER => 'user', \Magento\Backend\Block\Widget\Form\Container::PARAM_MODE => 'edit', \Magento\Backend\Block\Widget\Form\Container::PARAM_BLOCK_GROUP => 'Magento_User' ] ] ); $this->assertInstanceOf(\Magento\User\Block\User\Edit\Form::class, $block->getChildBlock('form')); } }