ArgumentsSerializationTest.php

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

use Magento\Setup\Module\Di\Compiler\Config\Chain\ArgumentsSerialization;
use Magento\Framework\Serialize\SerializerInterface;

class ArgumentsSerializationTest extends \PHPUnit\Framework\TestCase
{
    private $serializer;

    protected function setUp()
    {
        $this->serializer = $this->getMockBuilder(SerializerInterface::class)
            ->getMock();
        $this->serializer->expects($this->any())->method('serialize')->willReturnCallback(function ($param) {
            return json_encode($param);
        });
    }

    public function testModifyArgumentsDoNotExist()
    {
        $inputConfig = [
            'data' => []
        ];
        $modifier = new ArgumentsSerialization($this->serializer);
        $this->assertSame($inputConfig, $modifier->modify($inputConfig));
    }

    public function testModifyArguments()
    {
        $inputConfig = [
            'arguments' => [
                'argument1' => [],
                'argument2' => null,
            ]
        ];

        $expected = [
            'arguments' => [
                'argument1' => json_encode([]),
                'argument2' => null,
            ]
        ];

        $modifier = new ArgumentsSerialization($this->serializer);
        $this->assertEquals($expected, $modifier->modify($inputConfig));
    }
}