text: """Test libraries."""
  SECOND_SLEEP_FOR_TEST_SHORT = 0.12
  SECOND_SLEEP_FOR_TEST_MIDDLE = 0.25
  # New window in Windows works much slow.
  SECOND_SLEEP_FOR_TEST_WINDOWS_NEW_WINDOW = 3
  # When set 150, test_keyboard_interrupt_ctrl_c_popen failed in GitHub Actions.
  SECOND_SLEEP_FOR_TEST_KEYBOARD_INTERRUPT_CTRL_C_POPEN_SHORT = 180
  SECOND_SLEEP_FOR_TEST_KEYBOARD_INTERRUPT_CTRL_C_POPEN_MIDDLE = 180
  