/** * @covers \Magento\Framework\Data\Form\Element\AbstractElement::getHtmlContainerId() */ public function testGetHtmlContainerIdWithFieldContainerIdPrefix() { $id = 'id'; $prefix = 'prefix_'; $formMock = $this->getMock('Magento\\Framework\\Data\\Form\\AbstractForm', ['getFieldContainerIdPrefix'], [], '', false); $formMock->expects($this->once())->method('getFieldContainerIdPrefix')->will($this->returnValue($prefix)); $this->_model->setId($id); $this->_model->setForm($formMock); $this->assertEquals($prefix . $id, $this->_model->getHtmlContainerId()); }