Example integration test for terminal app

terminal-integration-test.tsx

test('ls <tab> with no arg should cycle through options', async (): Promise<void> => {
  const { getByLabelText } = render(
    <Terminal fileSystem={exampleFileSystem} />,
  );
  const input = getByLabelText('terminal-input') as HTMLInputElement;
  await userEvent.type(input, 'ls ');
  await fireTabInput(input);
  await fireTabInput(input);

  expect(input.value).toBe('ls home/');

  await fireTabInput(input);
  expect(input.value).toBe('ls docs/');

  await fireTabInput(input);
  expect(input.value).toBe('ls file3.txt');
});