[Server] Feat: Add comprehensive HTTP inspector tests with improved framework (#125)

* feat: add comprehensive HTTP inspector tests and improve test framework

* chore: remove debug flag from server configuration

tests/Inspector/Stdio/StdioInspectorSnapshotTestCase.php

@@ -0,0 +1,37 @@
+<?php
+
+/*
+ * This file is part of the official PHP MCP SDK.
+ *
+ * A collaboration between Symfony and the PHP Foundation.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Mcp\Tests\Inspector\Stdio;
+
+use Mcp\Tests\Inspector\InspectorSnapshotTestCase;
+
+abstract class StdioInspectorSnapshotTestCase extends InspectorSnapshotTestCase
+{
+    abstract protected function getServerScript(): string;
+
+    protected function getServerConnectionArgs(): array
+    {
+        return ['php', $this->getServerScript()];
+    }
+
+    protected function getTransport(): string
+    {
+        return 'stdio';
+    }
+
+    protected function getSnapshotFilePath(string $method, ?string $testName = null): string
+    {
+        $className = substr(static::class, strrpos(static::class, '\\') + 1);
+        $suffix = $testName ? '-'.preg_replace('/[^a-zA-Z0-9_]/', '_', $testName) : '';
+
+        return __DIR__.'/snapshots/'.$className.'-'.str_replace('/', '_', $method).$suffix.'.json';
+    }
+}