RegexTest.php

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<?php
namespace Magento\Framework\Event\Test\Unit\Observer;

use \Magento\Framework\Event\Observer\Regex;

class RegexTest extends \PHPUnit\Framework\TestCase
{
    protected $regex;

    protected function setUp()
    {
        $this->regex = new Regex();
    }

    protected function tearDown()
    {
        $this->regex = null;
    }

    public function testIsValidFor($pattern, $name, $expectedResult)
    {
        $this->regex->setEventRegex($pattern);
        $eventMock = $this->createMock(\Magento\Framework\Event::class);
        $eventMock->expects($this->any())
            ->method('getName')
            ->will($this->returnValue($name));

        $this->assertEquals($expectedResult, $this->regex->isValidFor($eventMock));
    }

    public function isValidForProvider()
    {
        return [
            ['~_name$~', 'event_name', true],
            ['~_names$~', 'event_name', false]
        ];
    }
}