AddFieldsToAttributeObserverTest.php

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<?php
namespace Magento\Swatches\Test\Unit\Observer;

class AddFieldsToAttributeObserverTest extends \PHPUnit\Framework\TestCase
{
    protected $moduleManagerMock;

    protected $yesNoMock;

    protected $formMock;

    protected $eventObserverMock;

    protected $observerMock;

    protected function setUp()
    {
        $this->moduleManagerMock = $this->createMock(\Magento\Framework\Module\Manager::class);

        $this->yesNoMock = $this->createMock(\Magento\Config\Model\Config\Source\Yesno::class);
        $this->eventObserverMock = $this->createPartialMock(
            \Magento\Framework\Event\Observer::class,
            ['getForm', 'getEvent', 'getAttribute']
        );
        $this->formMock = $this->createPartialMock(\Magento\Framework\Data\Form::class, ['getElement']);

        $objectManager = new \Magento\Framework\TestFramework\Unit\Helper\ObjectManager($this);
        $this->observerMock = $objectManager->getObject(
            \Magento\Swatches\Observer\AddFieldsToAttributeObserver::class,
            [
                'moduleManager' => $this->moduleManagerMock,
                'yesNo' => $this->yesNoMock,
            ]
        );
    }

    public function testAddFields($expected)
    {
        $this->moduleManagerMock
            ->expects($this->once())
            ->method('isOutputEnabled')
            ->willReturn($expected['isOutputEnabled']);

        $this->eventObserverMock
            ->expects($this->exactly($expected['methods_count']))
            ->method('getForm')
            ->willReturn($this->formMock);

        $element = $this->createMock(\Magento\Framework\Data\Form\Element\AbstractElement::class);
        $this->formMock
            ->expects($this->exactly($expected['methods_count']))
            ->method('getElement')
            ->with('base_fieldset')
            ->willReturn($element);

        $element->expects($this->exactly($expected['addField_count']))->method('addField');
        $this->yesNoMock->expects($this->exactly($expected['yesno_count']))->method('toOptionArray');
        $this->observerMock->execute($this->eventObserverMock);
    }

    public function dataAddFields()
    {
        return [
            [
                [
                    'isOutputEnabled' => true,
                    'methods_count' => 1,
                    'addField_count' => 2,
                    'yesno_count' => 1,
                ],
            ],
            [
                [
                    'isOutputEnabled' => false,
                    'methods_count' => 0,
                    'addField_count' => 0,
                    'yesno_count' => 0,
                ],
            ],
        ];
    }
}