AssertEmptyNullableObjectToAssertInstanceofRector.php

<?php

declare(strict_types=1);

namespace Rector\PHPUnit\CodeQuality\Rector\MethodCall;

use PhpParser\Node;
use PhpParser\Node\Arg;
use PhpParser\Node\Expr\ClassConstFetch;
use PhpParser\Node\Expr\MethodCall;
use PhpParser\Node\Identifier;
use PhpParser\Node\Name\FullyQualified;
use PHPStan\Type\ObjectType;
use PHPStan\Type\TypeCombinator;
use PHPStan\Type\UnionType;
use Rector\PHPUnit\NodeAnalyzer\TestsNodeAnalyzer;
use Rector\Rector\AbstractRector;
use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
use Symplify\RuleDocGenerator\ValueObject\RuleDefinition;

/**
 * @see \Rector\PHPUnit\Tests\CodeQuality\Rector\MethodCall\AssertEmptyNullableObjectToAssertInstanceofRector\AssertEmptyNullableObjectToAssertInstanceofRectorTest
 */
final class AssertEmptyNullableObjectToAssertInstanceofRector extends AbstractRector
{
    public function __construct(
        private readonly TestsNodeAnalyzer $testsNodeAnalyzer
    ) {
    }

    public function getRuleDefinition(): RuleDefinition
    {
        return new RuleDefinition(
            'Change assertNotEmpty() and assertNotNull() on an object to more clear assertInstanceof()',
            [
                new CodeSample(
                    <<<'CODE_SAMPLE'
use PHPUnit\Framework\TestCase;

class SomeClass extends TestCase
{
    public function test()
    {
        $someObject = new stdClass();

        $this->assertNotEmpty($someObject);
    }
}
CODE_SAMPLE
                    ,
                    <<<'CODE_SAMPLE'
use PHPUnit\Framework\TestCase;

class SomeClass extends TestCase
{
    public function test()
    {
        $someObject = new stdClass();

        $this->assertInstanceof(stdClass::class, $someObject);
    }
}
CODE_SAMPLE
                ),

            ]
        );
    }

    /**
     * @return array<class-string<Node>>
     */
    public function getNodeTypes(): array
    {
        return [MethodCall::class];
    }

    /**
     * @param MethodCall $node
     */
    public function refactor(Node $node): ?Node
    {
        if (! $this->testsNodeAnalyzer->isInTestClass($node)) {
            return null;
        }

        if (! $this->isNames($node->name, ['assertNotEmpty', 'assertEmpty', 'assertNull', 'assertNotNull'])) {
            return null;
        }

        if ($node->isFirstClassCallable()) {
            return null;
        }

        $firstArg = $node->getArgs()[0] ?? null;
        if (! $firstArg instanceof Arg) {
            return null;
        }

        $firstArgType = $this->getType($firstArg->value);
        if (! $firstArgType instanceof UnionType) {
            return null;
        }

        $pureType = TypeCombinator::removeNull($firstArgType);
        if (! $pureType instanceof ObjectType) {
            return null;
        }

        $methodName = $this->isNames(
            $node->name,
            ['assertEmpty', 'assertNull']
        ) ? 'assertNotInstanceOf' : 'assertInstanceOf';

        $node->name = new Identifier($methodName);

        $fullyQualified = new FullyQualified($pureType->getClassName());

        $customMessageArg = $node->getArgs()[1] ?? null;

        $node->args[0] = new Arg(new ClassConstFetch($fullyQualified, 'class'));
        $node->args[1] = $firstArg;

        if ($customMessageArg instanceof Arg) {
            $node->args[] = $customMessageArg;
        }

        return $node;
    }
}