fix(cli): improve focus navigation for interactive and background shells (#18343)

packages/cli/src/ui/utils/keybindingUtils.test.ts

@@ -0,0 +1,53 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { describe, it, expect } from 'vitest';
+import { formatKeyBinding, formatCommand } from './keybindingUtils.js';
+import { Command } from '../../config/keyBindings.js';
+
+describe('keybindingUtils', () => {
+  describe('formatKeyBinding', () => {
+    it('formats simple keys', () => {
+      expect(formatKeyBinding({ key: 'a' })).toBe('A');
+      expect(formatKeyBinding({ key: 'return' })).toBe('Enter');
+      expect(formatKeyBinding({ key: 'escape' })).toBe('Esc');
+    });
+
+    it('formats modifiers', () => {
+      expect(formatKeyBinding({ key: 'c', ctrl: true })).toBe('Ctrl+C');
+      expect(formatKeyBinding({ key: 'z', cmd: true })).toBe('Cmd+Z');
+      expect(formatKeyBinding({ key: 'up', shift: true })).toBe('Shift+Up');
+      expect(formatKeyBinding({ key: 'left', alt: true })).toBe('Alt+Left');
+    });
+
+    it('formats multiple modifiers in order', () => {
+      expect(formatKeyBinding({ key: 'z', ctrl: true, shift: true })).toBe(
+        'Ctrl+Shift+Z',
+      );
+      expect(
+        formatKeyBinding({
+          key: 'a',
+          ctrl: true,
+          alt: true,
+          shift: true,
+          cmd: true,
+        }),
+      ).toBe('Ctrl+Alt+Shift+Cmd+A');
+    });
+  });
+
+  describe('formatCommand', () => {
+    it('formats default commands', () => {
+      expect(formatCommand(Command.QUIT)).toBe('Ctrl+C');
+      expect(formatCommand(Command.SUBMIT)).toBe('Enter');
+      expect(formatCommand(Command.TOGGLE_BACKGROUND_SHELL)).toBe('Ctrl+B');
+    });
+
+    it('returns empty string for unknown commands', () => {
+      expect(formatCommand('unknown.command' as unknown as Command)).toBe('');
+    });
+  });
+});