FormTest.php

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<?php
namespace Magento\GoogleOptimizer\Test\Unit\Helper;

class FormTest extends \PHPUnit\Framework\TestCase
{
    protected $_helper;

    protected $_formMock;

    protected $_fieldsetMock;

    protected $_experimentCodeMock;

    protected function setUp()
    {
        $this->_formMock = $this->createPartialMock(
            \Magento\Framework\Data\Form::class,
            ['setFieldNameSuffix', 'addFieldset']
        );
        $this->_fieldsetMock = $this->createMock(\Magento\Framework\Data\Form\Element\Fieldset::class);
        $this->_experimentCodeMock = $this->createPartialMock(
            \Magento\GoogleOptimizer\Model\Code::class,
            ['getExperimentScript', 'getCodeId', '__wakeup']
        );
        $context = $this->createMock(\Magento\Framework\App\Helper\Context::class);
        $data = ['context' => $context];
        $objectManagerHelper = new \Magento\Framework\TestFramework\Unit\Helper\ObjectManager($this);
        $this->_helper = $objectManagerHelper->getObject(\Magento\GoogleOptimizer\Helper\Form::class, $data);
    }

    public function testAddFieldsWithExperimentCode()
    {
        $experimentCode = 'some-code';
        $experimentCodeId = 'code-id';
        $this->_experimentCodeMock->expects(
            $this->once()
        )->method(
            'getExperimentScript'
        )->will(
            $this->returnValue($experimentCode)
        );
        $this->_experimentCodeMock->expects(
            $this->once()
        )->method(
            'getCodeId'
        )->will(
            $this->returnValue($experimentCodeId)
        );
        $this->_prepareFormMock($experimentCode, $experimentCodeId);

        $this->_helper->addGoogleoptimizerFields($this->_formMock, $this->_experimentCodeMock);
    }

    public function testAddFieldsWithoutExperimentCode()
    {
        $experimentCode = '';
        $experimentCodeId = '';
        $this->_prepareFormMock($experimentCode, $experimentCodeId);

        $this->_helper->addGoogleoptimizerFields($this->_formMock, null);
    }

    protected function _prepareFormMock($experimentCode, $experimentCodeId)
    {
        $this->_formMock->expects(
            $this->once()
        )->method(
            'addFieldset'
        )->with(
            'googleoptimizer_fields',
            ['legend' => 'Google Analytics Content Experiments Code']
        )->will(
            $this->returnValue($this->_fieldsetMock)
        );

        $this->_fieldsetMock->expects(
            $this->at(0)
        )->method(
            'addField'
        )->with(
            'experiment_script',
            'textarea',
            [
                'name' => 'experiment_script',
                'label' => 'Experiment Code',
                'value' => $experimentCode,
                'class' => 'textarea googleoptimizer',
                'required' => false,
                'note' => 'Experiment code should be added to the original page only.',
                'data-form-part' => ''
            ]
        );

        $this->_fieldsetMock->expects(
            $this->at(1)
        )->method(
            'addField'
        )->with(
            'code_id',
            'hidden',
            [
                'name' => 'code_id',
                'value' => $experimentCodeId,
                'required' => false,
                'data-form-part' => ''
            ]
        );
        $this->_formMock->expects($this->once())->method('setFieldNameSuffix')->with('google_experiment');
    }
}