Adopt server examples

tests/Example/InspectorSnapshotTestCase.php

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+<?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\Example;
+
+use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Process\Process;
+
+abstract class InspectorSnapshotTestCase extends TestCase
+{
+    #[DataProvider('provideMethods')]
+    public function testResourcesListOutputMatchesSnapshot(string $method): void
+    {
+        $process = Process::fromShellCommandline(
+            \sprintf('npx @modelcontextprotocol/inspector --cli php %s --method %s', $this->getServerScript(), $method)
+        )->mustRun();
+
+        $output = $process->getOutput();
+        $snapshotFile = $this->getSnapshotFilePath($method);
+
+        if (!file_exists($snapshotFile)) {
+            file_put_contents($snapshotFile, $output.\PHP_EOL);
+            $this->markTestIncomplete("Snapshot created at $snapshotFile, please re-run tests.");
+        }
+
+        $expected = file_get_contents($snapshotFile);
+
+        $this->assertJsonStringEqualsJsonString($expected, $output);
+    }
+
+    /**
+     * List of methods to test.
+     *
+     * @return array<string, array{method: string}>
+     */
+    abstract public static function provideMethods(): array;
+
+    abstract protected function getServerScript(): string;
+
+    /**
+     * @return array<string, array{method: string}>
+     */
+    protected static function provideListMethods(): array
+    {
+        return [
+            'Prompt Listing' => ['method' => 'prompts/list'],
+            'Resource Listing' => ['method' => 'resources/list'],
+            // 'Resource Template Listing' => ['method' => 'resources/templates/list'],
+            'Tool Listing' => ['method' => 'tools/list'],
+        ];
+    }
+
+    private function getSnapshotFilePath(string $method): string
+    {
+        $className = substr(static::class, strrpos(static::class, '\\') + 1);
+
+        return __DIR__.'/snapshots/'.$className.'-'.str_replace('/', '_', $method).'.json';
+    }
+}