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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;

use function is_object;
use PHPUnit\Framework\ActualValueIsNotAnObjectException;
use PHPUnit\Framework\ComparisonMethodDoesNotAcceptParameterTypeException;
use PHPUnit\Framework\ComparisonMethodDoesNotDeclareBoolReturnTypeException;
use PHPUnit\Framework\ComparisonMethodDoesNotDeclareExactlyOneParameterException;
use PHPUnit\Framework\ComparisonMethodDoesNotDeclareParameterTypeException;
use PHPUnit\Framework\ComparisonMethodDoesNotExistException;
use ReflectionNamedType;
use ReflectionObject;

/**
 * @no-named-arguments Parameter names are not covered by the backward compatibility promise for PHPUnit
 */
final class ObjectEquals extends Constraint
{
    private readonly object $expected;
    private readonly string $method;

public function __construct(object $object, string $method = 'equals')
    {
        $this->expected = $object;
        $this->method   = $method;
    }

public function toString(): string
    {
        return 'two objects are equal';
    }

/**
     * @throws ActualValueIsNotAnObjectException
     * @throws ComparisonMethodDoesNotAcceptParameterTypeException
     * @throws ComparisonMethodDoesNotDeclareBoolReturnTypeException
     * @throws ComparisonMethodDoesNotDeclareExactlyOneParameterException
     * @throws ComparisonMethodDoesNotDeclareParameterTypeException
     * @throws ComparisonMethodDoesNotExistException
     */
    protected function matches(mixed $other): bool
    {
        if (!is_object($other)) {
            throw new ActualValueIsNotAnObjectException;
        }

$object = new ReflectionObject($other);

if (!$object->hasMethod($this->method)) {
            throw new ComparisonMethodDoesNotExistException(
                $other::class,
                $this->method,
            );
        }

$method = $object->getMethod($this->method);

if (!$method->hasReturnType()) {
            throw new ComparisonMethodDoesNotDeclareBoolReturnTypeException(
                $other::class,
                $this->method,
            );
        }

$returnType = $method->getReturnType();

if (!$returnType instanceof ReflectionNamedType) {
            throw new ComparisonMethodDoesNotDeclareBoolReturnTypeException(
                $other::class,
                $this->method,
            );
        }

if ($returnType->allowsNull()) {
            throw new ComparisonMethodDoesNotDeclareBoolReturnTypeException(
                $other::class,
                $this->method,
            );
        }

if ($returnType->getName() !== 'bool') {
            throw new ComparisonMethodDoesNotDeclareBoolReturnTypeException(
                $other::class,
                $this->method,
            );
        }

if ($method->getNumberOfParameters() !== 1 || $method->getNumberOfRequiredParameters() !== 1) {
            throw new ComparisonMethodDoesNotDeclareExactlyOneParameterException(
                $other::class,
                $this->method,
            );
        }

$parameter = $method->getParameters()[0];

if (!$parameter->hasType()) {
            throw new ComparisonMethodDoesNotDeclareParameterTypeException(
                $other::class,
                $this->method,
            );
        }

$type = $parameter->getType();

if (!$type instanceof ReflectionNamedType) {
            throw new ComparisonMethodDoesNotDeclareParameterTypeException(
                $other::class,
                $this->method,
            );
        }

$typeName = $type->getName();

if ($typeName === 'self') {
            $typeName = $other::class;
        }

if (!$this->expected instanceof $typeName) {
            throw new ComparisonMethodDoesNotAcceptParameterTypeException(
                $other::class,
                $this->method,
                $this->expected::class,
            );
        }

return $other->{$this->method}($this->expected);
    }

protected function failureDescription(mixed $other): string
    {
        return $this->toString(true);
    }
}

✏️ Editing: ObjectEquals.php

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