assertThat(expected).hasCauseThat().isSameInstanceAs(CHECKED_EXCEPTION);
  }

  // Edge case tests of the exception-construction code through untimed get():

  @SuppressWarnings("FuturesGetCheckedIllegalExceptionType")
  public void testGetCheckedUntimed_exceptionClassIsRuntimeException() {
    assertThrows(
        IllegalArgumentException.class,