AssertSameNullExpectedRule.php

<?php

declare (strict_types=1);
namespace PHPStan\Rules\PHPUnit;

use PhpParser\Node;
use PhpParser\Node\Expr\ConstFetch;
use PhpParser\NodeAbstract;
use PHPStan\Analyser\Scope;
use PHPStan\Rules\Rule;
use PHPStan\Rules\RuleErrorBuilder;
use function count;

/**
 * @implements Rule<NodeAbstract>
 */
class AssertSameNullExpectedRule implements Rule {
    public function getNodeType() : string {
        return NodeAbstract::class;
    }
    public function processNode(Node $node, Scope $scope) : array {
        if (!AssertRuleHelper::isMethodOrStaticCallOnAssert($node, $scope)) {
            return [];
        }
        if (count($node->getArgs()) < 2) {
            return [];
        }
        if (!$node->name instanceof Node\Identifier || $node->name
            ->toLowerString() !== 'assertsame') {
            return [];
        }
        $expectedArgumentValue = $node->getArgs()[0]->value;
        if (!$expectedArgumentValue instanceof ConstFetch) {
            return [];
        }
        if ($expectedArgumentValue->name
            ->toLowerString() === 'null') {
            return [
                RuleErrorBuilder::message('You should use assertNull() instead of assertSame(null, $actual).')->identifier('phpunit.assertNull')
                    ->build(),
            ];
        }
        return [];
    }

}