First batch of fixing tests to use best practices. (#11964)

packages/cli/src/ui/components/shared/text-buffer.test.ts

@@ -4,6 +4,8 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+/** @vitest-environment jsdom */
+
 import { describe, it, expect, beforeEach } from 'vitest';
 import stripAnsi from 'strip-ansi';
 import { renderHook, act } from '@testing-library/react';