AddPaypalShortcutsTest.php

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

use Magento\Braintree\Block\Paypal\Button;
use Magento\Catalog\Block\ShortcutButtons;
use Magento\Framework\Event;
use Magento\Framework\Event\Observer;
use Magento\Braintree\Observer\AddPaypalShortcuts;
use Magento\Framework\View\LayoutInterface;

class AddPaypalShortcutsTest extends \PHPUnit\Framework\TestCase
{
    public function testExecute()
    {
        $addPaypalShortcuts = new AddPaypalShortcuts();

        $observerMock = $this->getMockBuilder(Observer::class)
            ->disableOriginalConstructor()
            ->getMock();

        $eventMock = $this->getMockBuilder(Event::class)
            ->setMethods(['getContainer'])
            ->disableOriginalConstructor()
            ->getMock();

        $shortcutButtonsMock = $this->getMockBuilder(ShortcutButtons::class)
            ->disableOriginalConstructor()
            ->getMock();

        $layoutMock = $this->getMockBuilder(LayoutInterface::class)
            ->getMockForAbstractClass();

        $blockMock = $this->getMockBuilder(Button::class)
            ->disableOriginalConstructor()
            ->getMock();

        $observerMock->expects(self::once())
            ->method('getEvent')
            ->willReturn($eventMock);

        $eventMock->expects(self::once())
            ->method('getContainer')
            ->willReturn($shortcutButtonsMock);

        $shortcutButtonsMock->expects(self::once())
            ->method('getLayout')
            ->willReturn($layoutMock);

        $layoutMock->expects(self::once())
            ->method('createBlock')
            ->with(AddPaypalShortcuts::PAYPAL_SHORTCUT_BLOCK)
            ->willReturn($blockMock);

        $shortcutButtonsMock->expects(self::once())
            ->method('addShortcut')
            ->with($blockMock);

        $addPaypalShortcuts->execute($observerMock);
    }
}