CancellationException e = assertThrows(CancellationException.class, () -> future.get());
    assertThat(e.getCause()).isNotNull();
  }

  public void testSetFuture_misbehavingFutureDoesNotThrow() throws Exception {
    ListenableFuture<String> badFuture =
        new ListenableFuture<String>() {
          @Override
          public boolean cancel(boolean interrupt) {
            return false;