NodeMergingConfigTest.php

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<?php
namespace Magento\Framework\Config\Test\Unit\Dom;

use \Magento\Framework\Config\Dom\NodeMergingConfig;

class NodeMergingConfigTest extends \PHPUnit\Framework\TestCase
{
    protected $object;

    protected $nodePathMatcher;

    protected function setUp()
    {
        $this->nodePathMatcher = $this->createMock(\Magento\Framework\Config\Dom\NodePathMatcher::class);
        $this->object = new NodeMergingConfig(
            $this->nodePathMatcher,
            ['/root/one' => 'name', '/root/two' => 'id', '/root/three' => 'key']
        );
    }

    public function testGetIdAttributeMatched()
    {
        $xpath = '/root/two[@attr="value"]';
        $this->nodePathMatcher->expects(
            $this->at(0)
        )->method(
            'match'
        )->with(
            '/root/one',
            $xpath
        )->will(
            $this->returnValue(false)
        );
        $this->nodePathMatcher->expects(
            $this->at(1)
        )->method(
            'match'
        )->with(
            '/root/two',
            $xpath
        )->will(
            $this->returnValue(true)
        );
        $this->assertEquals('id', $this->object->getIdAttribute($xpath));
    }

    public function testGetIdAttributeNotMatched()
    {
        $xpath = '/root/four[@attr="value"]';
        $this->nodePathMatcher->expects(
            $this->at(0)
        )->method(
            'match'
        )->with(
            '/root/one',
            $xpath
        )->will(
            $this->returnValue(false)
        );
        $this->nodePathMatcher->expects(
            $this->at(1)
        )->method(
            'match'
        )->with(
            '/root/two',
            $xpath
        )->will(
            $this->returnValue(false)
        );
        $this->nodePathMatcher->expects(
            $this->at(2)
        )->method(
            'match'
        )->with(
            '/root/three',
            $xpath
        )->will(
            $this->returnValue(false)
        );
        $this->assertNull($this->object->getIdAttribute($xpath));
    }
}