feat: add /commands reload to refresh custom TOML commands (#19078)

packages/cli/src/ui/commands/commandsCommand.test.ts

@@ -0,0 +1,56 @@
+/**
+ * @license
+ * Copyright 2026 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { commandsCommand } from './commandsCommand.js';
+import { MessageType } from '../types.js';
+import { createMockCommandContext } from '../../test-utils/mockCommandContext.js';
+import type { CommandContext } from './types.js';
+
+describe('commandsCommand', () => {
+  let context: CommandContext;
+
+  beforeEach(() => {
+    vi.clearAllMocks();
+    context = createMockCommandContext({
+      ui: {
+        reloadCommands: vi.fn(),
+      },
+    });
+  });
+
+  describe('default action', () => {
+    it('should return an info message prompting subcommand usage', async () => {
+      const result = await commandsCommand.action!(context, '');
+
+      expect(result).toEqual({
+        type: 'message',
+        messageType: 'info',
+        content:
+          'Use "/commands reload" to reload custom command definitions from .toml files.',
+      });
+    });
+  });
+
+  describe('reload', () => {
+    it('should call reloadCommands and show a success message', async () => {
+      const reloadCmd = commandsCommand.subCommands!.find(
+        (s) => s.name === 'reload',
+      )!;
+
+      await reloadCmd.action!(context, '');
+
+      expect(context.ui.reloadCommands).toHaveBeenCalledTimes(1);
+      expect(context.ui.addItem).toHaveBeenCalledWith(
+        expect.objectContaining({
+          type: MessageType.INFO,
+          text: 'Custom commands reloaded successfully.',
+        }),
+        expect.any(Number),
+      );
+    });
+  });
+});