WP-LIT-MCP/tests/Unit/LogTest.php

<?php

declare(strict_types=1);

namespace LIT\MCP\Tests\Unit;

use LIT\MCP\Log;
use RuntimeException;

final class LogTest extends TestCase
{
    /** @return string What the callback wrote to the error log. */
    private static function captured(callable $write): string
    {
        // error_log() is a PHP internal and cannot be stubbed; redirect it to a temp file instead.
        $log = (string) tempnam(sys_get_temp_dir(), 'lit-mcp-log');
        $previous = ini_set('error_log', $log);

        try {
            $write();
        } finally {
            ini_set('error_log', (string) $previous);
        }

        $content = (string) file_get_contents($log);
        unlink($log);

        return $content;
    }

    public function testFailureKeepsThePrefixedFormat(): void
    {
        $content = self::captured(static fn () => Log::failure('media usage query', 'Table gone'));

        self::assertStringContainsString('[wp-lit-mcp] media usage query failed: Table gone', $content);
    }

    public function testFailureLogsAThrowableWithItsTrace(): void
    {
        $e = new RuntimeException('kaputt');
        $content = self::captured(static fn () => Log::failure('lit/x', $e));

        self::assertStringContainsString('[wp-lit-mcp] lit/x failed: RuntimeException: kaputt', $content);
        self::assertStringContainsString('Stack trace', $content);
    }

    public function testLineOnlyAddsThePrefix(): void
    {
        $content = self::captured(static fn () => Log::line('change log insert failed for a b:1'));

        self::assertStringContainsString('[wp-lit-mcp] change log insert failed for a b:1', $content);
    }
}