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PHP Mutation Testing

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<?php
 
declare(strict_types=1);
 
namespace Infected;
 
class SourceClass
{
    public function add(int $a, int $b): int
    {
        return $a + $b;
    }
}
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<?php
 
declare(strict_types=1);
 
namespace Infected\Tests;
 
use Infected\SourceClass;
use PHPUnit\Framework\TestCase;
 
class SourceClassTest extends TestCase
{
    public function test_it_adds_2_numbers(): void
    {
        $source = new SourceClass();
 
        $result = $source->add(1, 2);
 
        self::assertSame(3, $result);
    }
}
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{
    "mutators": {
        "@default": true
    }
}
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