<?php

declare(strict_types=1);

namespace Blax\ReactPhpKernel\Tests;

use Blax\ReactPhpKernel\Ipc\SocketPairIpc;
use PHPUnit\Framework\TestCase;
use React\EventLoop\StreamSelectLoop;

final class SocketPairIpcTest extends TestCase
{
    protected function setUp(): void
    {
        if (! SocketPairIpc::isSupported()) {
            $this->markTestSkipped('ext-sockets (socket_create_pair / socket_export_stream) not available');
        }
    }

    public function test_reports_support_on_this_platform(): void
    {
        $this->assertTrue(SocketPairIpc::isSupported());
    }

    public function test_create_returns_an_unconfigured_instance(): void
    {
        $ipc = SocketPairIpc::create(new StreamSelectLoop);

        $this->assertInstanceOf(SocketPairIpc::class, $ipc);
    }

    public function test_double_configuration_is_rejected(): void
    {
        $ipc = SocketPairIpc::create(new StreamSelectLoop);
        $ipc->setupChild();

        $this->expectException(\LogicException::class);
        $ipc->setupChild();
    }

    public function test_send_from_a_non_child_is_rejected(): void
    {
        $ipc = SocketPairIpc::create(new StreamSelectLoop);

        // Not configured as child -> sendToParent must refuse.
        $this->expectException(\LogicException::class);
        $ipc->sendToParent('nope');
    }
}