ModificationChainTest.php

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<?php
namespace Magento\Setup\Test\Unit\Module\Di\Compiler\Config;

use \Magento\Setup\Module\Di\Compiler\Config\ModificationChain;

class ModificationChainTest extends \PHPUnit\Framework\TestCase
{
    public function testConstructor()
    {
        $modificationsList = [];
        $modificationsList[] = $this->getMockBuilder(
            \Magento\Setup\Module\Di\Compiler\Config\ModificationInterface::class
        )->getMock();
        $modificationsList[] = $this->getMockBuilder(
            \Magento\Setup\Module\Di\Compiler\Config\ModificationInterface::class
        )->getMock();

        new ModificationChain($modificationsList);
    }

    public function testConstructorException()
    {
        $this->expectException('InvalidArgumentException');
        $this->expectExceptionMessage('Wrong modifier provided');
        $modificationsList = [];
        $modificationsList[] = $this->getMockBuilder(
            \Magento\Setup\Module\Di\Compiler\Config\ModificationInterface::class
        )->getMock();
        $modificationsList[] = $this->getMockBuilder(
            \Magento\Setup\Module\Di\Compiler\Config\ModificationInterface::class
        )->getMock();
        $modificationsList[] = 'banana';

        new ModificationChain($modificationsList);
    }

    public function testModify()
    {
        $inputArray = [
            'data' => [1, 2, 3]
        ];

        $expectedArray1 = [
            'data' => [1, 2, 3, 1]
        ];

        $expectedArray2 = [
            'data' => [1, 2, 3, 1, 1]
        ];

        $modifier1 = $this->getMockBuilder(\Magento\Setup\Module\Di\Compiler\Config\ModificationInterface::class)
            ->getMock();
        $modifier2 = $this->getMockBuilder(\Magento\Setup\Module\Di\Compiler\Config\ModificationInterface::class)
            ->getMock();

        $modificationsList = [$modifier1, $modifier2];

        $modifier1->expects($this->once())
            ->method('modify')
            ->with($inputArray)
            ->willReturn($expectedArray1);

        $modifier2->expects($this->once())
            ->method('modify')
            ->with($expectedArray1)
            ->willReturn($expectedArray2);

        $chain = new ModificationChain($modificationsList);

        $this->assertEquals($expectedArray2, $chain->modify($inputArray));
    }
}