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<?php declare(strict_types=1); /* * This file is part of PHPUnit. * * (c) Sebastian Bergmann <sebastian@phpunit.de> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace PHPUnit\Framework\Constraint; /** * Constraint that accepts null. */ final class IsNull extends Constraint { /** * Returns a string representation of the constraint. */ public function toString(): string { return 'is null'; } /** * Evaluates the constraint for parameter $other. Returns true if the * constraint is met, false otherwise. * * @param mixed $other value or object to evaluate */ protected function matches($other): bool { return $other === null; } }