feat(cli): unify /chat and /resume command UX (#20256)

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

@@ -0,0 +1,41 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { describe, expect, it } from 'vitest';
+import { resumeCommand } from './resumeCommand.js';
+import type { CommandContext } from './types.js';
+
+describe('resumeCommand', () => {
+  it('should open the session browser for bare /resume', async () => {
+    const result = await resumeCommand.action?.({} as CommandContext, '');
+    expect(result).toEqual({
+      type: 'dialog',
+      dialog: 'sessionBrowser',
+    });
+  });
+
+  it('should expose unified chat subcommands directly under /resume', () => {
+    const visibleSubCommandNames = (resumeCommand.subCommands ?? [])
+      .filter((subCommand) => !subCommand.hidden)
+      .map((subCommand) => subCommand.name);
+
+    expect(visibleSubCommandNames).toEqual(
+      expect.arrayContaining(['list', 'save', 'resume', 'delete', 'share']),
+    );
+  });
+
+  it('should keep a hidden /resume checkpoints compatibility alias', () => {
+    const checkpoints = resumeCommand.subCommands?.find(
+      (subCommand) => subCommand.name === 'checkpoints',
+    );
+    expect(checkpoints?.hidden).toBe(true);
+    expect(
+      checkpoints?.subCommands?.map((subCommand) => subCommand.name),
+    ).toEqual(
+      expect.arrayContaining(['list', 'save', 'resume', 'delete', 'share']),
+    );
+  });
+});