chore: add tests for new conformance test scenarios

Author: anubhav756

src/scenarios/client/stateless.test.ts

@@ -0,0 +1,33 @@
+import { describe, test } from 'vitest';
+import {
+  runClientAgainstScenario,
+  InlineClientRunner
+} from './auth/test_helpers/testClient';
+
+// A bad client that does not send _meta
+async function badClient(serverUrl: string) {
+  const response = await fetch(serverUrl, {
+    method: 'POST',
+    headers: {
+      'Content-Type': 'application/json'
+    },
+    body: JSON.stringify({
+      jsonrpc: '2.0',
+      id: 1,
+      method: 'tools/list',
+      params: {} // Missing _meta
+    })
+  });
+  return response.json();
+}
+
+describe('Stateless Client Scenario Negative Tests', () => {
+  test('client fails when omitting _meta', async () => {
+    const runner = new InlineClientRunner(badClient);
+
+    // runClientAgainstScenario searches for the scenario by name in the registry
+    await runClientAgainstScenario(runner, 'stateless-client', {
+      expectedFailureSlugs: ['client-populates-meta']
+    });
+  });
+});