NullTransformationTest.php

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<?php

declare(strict_types=1);

use ILIAS\Refinery\KindlyTo\Transformation\NullTransformation;
use PHPUnit\Framework\TestCase;
use ILIAS\Refinery\ConstraintViolationException;
use PHPUnit\Framework\Attributes\DataProvider;

class NullTransformationTest extends TestCase
{
    private NullTransformation $transformation;

    protected function setUp(): void
    {
        $this->transformation = new NullTransformation();
    }

    public static function NullTestDataProvider(): array
    {
        return [
            'empty string' => ['', true],
            'space' => [' ', true],
            'spaces' => ['   ', true],
            'null' => [null, true],
            'string' => ['str', false],
            'int' => [1, false],
            'negative int' => [-1, false],
            'zero' => [0, false],
            'array' => [[], false],
            'bool (false)' => [false, false],
            'bool (true)' => [true, false]
        ];
    }

    #[DataProvider('NullTestDataProvider')]
    public function testNullTransformation(mixed $value, bool $valid): void
    {
        if (!$valid) {
            $this->expectException(ConstraintViolationException::class);
        }
        $transformed = $this->transformation->transform($value);
        $this->assertNull($transformed);
    }
}