message: fix CodeSnippet test case warnings
diff: */
  import React from 'react';
  -import { render, fireEvent } from '@testing-library/react';
  -import { wrapInTestApp } from '@backstage/test-utils';
  +import { fireEvent } from '@testing-library/react';
  +import { act } from 'react-dom/test-utils';
  +import { renderInTestApp } from '@backstage/test-utils';
  import { CodeSnippet } from './CodeSnippet';
  @@ -32,24 +33,24 @@ const minProps = {
  };
  describe('<CodeSnippet />', () => {
  - it('renders text without exploding', () => {
  - const { getByText } = render(wrapInTestApp(<CodeSnippet {...minProps} />));
  + it('renders text without exploding', async () => {
  + const { getByText } = await renderInTestApp(<CodeSnippet {...minProps} />);
  expect(getByText(/"Hello"/)).toBeInTheDocument();
  expect(getByText(/"World"/)).toBeInTheDocument();
  });
  - it('renders without line numbers', () => {
  - const { queryByText } = render(
  - wrapInTestApp(<CodeSnippet {...minProps} />),
  + it('renders without line numbers', async () => {
  + const { queryByText } = await renderInTestApp(
  + <CodeSnippet {...minProps} />,
  );
  expect(queryByText('1')).not.toBeInTheDocument();
  expect(queryByText('2')).not.toBeInTheDocument();
  expect(queryByText('3')).not.toBeInTheDocument();
  });
  - it('renders with line numbers', () => {
  - const { getByText } = render(
  - wrapInTestApp(<CodeSnippet {...minProps} showLineNumbers />),
  + it('renders with line numbers', async () => {
  + const { getByText } = await renderInTestApp(
  + <CodeSnippet {...minProps} showLineNumbers />,
  );
  expect(getByText('1')).toBeInTheDocument();
  expect(getByText('2')).toBeInTheDocument();
  @@ -57,12 +58,17 @@ describe('<CodeSnippet />', () => {
  });
  it('copy code using button', async () => {
  + jest.useFakeTimers();
  document.execCommand = jest.fn();
  - const { getByTitle } = render(
  - wrapInTestApp(<CodeSnippet {...minProps} showCopyCodeButton />),
  + const { getByTitle } = await renderInTestApp(
  + <CodeSnippet {...minProps} showCopyCodeButton />,
  );
  const button = getByTitle('Text copied to clipboard');
  fireEvent.click(button);
  + act(() => {
  + jest.runAllTimers();
  + });
  expect(document.execCommand).toHaveBeenCalled();
  + jest.useRealTimers();
  });
  });
  