DataTest.php

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

class DataTest extends \PHPUnit\Framework\TestCase
{
    protected $helper;

    protected $scopeConfigMock;

    protected $customerSessionMock;

    protected $customerViewHelperMock;

    protected $objectManagerHelper;

    protected function setUp()
    {
        $this->objectManagerHelper = new \Magento\Framework\TestFramework\Unit\Helper\ObjectManager($this);
        $className = \Magento\Contact\Helper\Data::class;
        $arguments = $this->objectManagerHelper->getConstructArguments($className);
        $context = $arguments['context'];
        $this->scopeConfigMock = $context->getScopeConfig();
        $this->customerSessionMock = $arguments['customerSession'];
        $this->customerViewHelperMock = $arguments['customerViewHelper'];
        $this->helper = $this->objectManagerHelper->getObject($className, $arguments);
    }

    public function testIsEnabled()
    {
        $this->scopeConfigMock->expects($this->once())
            ->method('getValue')
            ->willReturn('1');

        $this->assertTrue(is_string($this->helper->isEnabled()));
    }

    public function testIsNotEnabled()
    {
        $this->scopeConfigMock->expects($this->once())
            ->method('getValue')
            ->willReturn(null);

        $this->assertTrue(null === $this->helper->isEnabled());
    }

    public function testGetUserNameNotLoggedIn()
    {
        $this->customerSessionMock->expects($this->once())
            ->method('isLoggedIn')
            ->willReturn(false);

        $this->assertEmpty($this->helper->getUserName());
    }

    public function testGetUserName()
    {
        $this->customerSessionMock->expects($this->once())
            ->method('isLoggedIn')
            ->willReturn(true);

        $customerDataObject = $this->getMockBuilder(\Magento\Customer\Model\Data\Customer::class)
            ->disableOriginalConstructor()
            ->getMock();
        $this->customerSessionMock->expects($this->once())
            ->method('getCustomerDataObject')
            ->willReturn($customerDataObject);

        $this->customerViewHelperMock->expects($this->once())
            ->method('getCustomerName')
            ->willReturn(' customer name ');

        $this->assertEquals('customer name', $this->helper->getUserName());
    }

    public function testGetUserEmailNotLoggedIn()
    {
        $this->customerSessionMock->expects($this->once())
            ->method('isLoggedIn')
            ->willReturn(false);

        $this->assertEmpty($this->helper->getUserEmail());
    }

    public function testGetUserEmail()
    {
        $this->customerSessionMock->expects($this->once())
            ->method('isLoggedIn')
            ->willReturn(true);

        $customerDataObject = $this->createMock(\Magento\Customer\Api\Data\CustomerInterface::class);
        $customerDataObject->expects($this->once())
            ->method('getEmail')
            ->willReturn('[email protected]');

        $this->customerSessionMock->expects($this->once())
            ->method('getCustomerDataObject')
            ->willReturn($customerDataObject);

        $this->assertEquals('[email protected]', $this->helper->getUserEmail());
    }

    public function testGetPostValue()
    {
        $postData = ['name' => 'Some Name', 'email' => 'Some Email'];

        $dataPersistorMock = $this->getMockBuilder(\Magento\Framework\App\Request\DataPersistorInterface::class)
            ->getMockForAbstractClass();
        $dataPersistorMock->expects($this->once())
            ->method('get')
            ->with('contact_us')
            ->willReturn($postData);
        $dataPersistorMock->expects($this->once())
            ->method('clear')
            ->with('contact_us');

        $this->objectManagerHelper->setBackwardCompatibleProperty($this->helper, 'dataPersistor', $dataPersistorMock);

        $this->assertSame($postData['name'], $this->helper->getPostValue('name'));
        $this->assertSame($postData['email'], $this->helper->getPostValue('email'));
    }
}