CodeCheckTest.php

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<?php
namespace Magento\Test\Utility\File;

use Magento\TestFramework\Utility\CodeCheck;

class CodeCheckTest extends \PHPUnit\Framework\TestCase
{
    private $codeCheck;

    protected function setUp()
    {
        $this->codeCheck = new CodeCheck();
    }

    public function testIsClassUsed($fileContent, $isClassUsed)
    {
        $this->assertEquals(
            $isClassUsed,
            $this->codeCheck->isClassUsed('MyClass', $fileContent)
        );
    }

    public function isClassUsedDataProvider()
    {
        return [
            [file_get_contents(__DIR__ . '/_files/create_new_instance.txt'), true],
            [file_get_contents(__DIR__ . '/_files/create_new_instance2.txt'), true],
            [file_get_contents(__DIR__ . '/_files/create_new_instance3.txt'), true],
            [file_get_contents(__DIR__ . '/_files/class_name_in_namespace_and_variable_name.txt'), false],
            [file_get_contents(__DIR__ . '/_files/extends.txt'), true],
            [file_get_contents(__DIR__ . '/_files/extends2.txt'), true],
            [file_get_contents(__DIR__ . '/_files/use.txt'), true],
            [file_get_contents(__DIR__ . '/_files/use2.txt'), true]
        ];
    }

    public function testIsDirectDescendant($fileContent, $isDirectDescendant)
    {
        $this->assertEquals(
            $isDirectDescendant,
            $this->codeCheck->isDirectDescendant($fileContent, 'MyClass')
        );
    }

    public function isDirectDescendantDataProvider()
    {
        return [
            [file_get_contents(__DIR__ . '/_files/extends.txt'), true],
            [file_get_contents(__DIR__ . '/_files/extends2.txt'), true],
            [file_get_contents(__DIR__ . '/_files/implements.txt'), true],
            [file_get_contents(__DIR__ . '/_files/implements2.txt'), true]
        ];
    }
}