feat(a2a): Introduce /init command for a2a server (#13419)

packages/core/src/commands/init.test.ts

@@ -0,0 +1,29 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { expect, describe, it } from 'vitest';
+import { performInit } from './init.js';
+
+describe('performInit', () => {
+  it('returns info if GEMINI.md already exists', () => {
+    const result = performInit(true);
+
+    expect(result.type).toBe('message');
+    if (result.type === 'message') {
+      expect(result.messageType).toBe('info');
+      expect(result.content).toContain('already exists');
+    }
+  });
+
+  it('returns submit_prompt if GEMINI.md does not exist', () => {
+    const result = performInit(false);
+    expect(result.type).toBe('submit_prompt');
+
+    if (result.type === 'submit_prompt') {
+      expect(result.content).toContain('You are an AI agent');
+    }
+  });
+});