assertThat(expected).hasCauseThat().isInstanceOf(IllegalArgumentException.class);
    assertThat(expected).hasCauseThat().hasMessageThat().contains(badFuture.toString());
  }

  public void testSetFuture_misbehavingFutureDoesNotThrow() throws Exception {
    SettableFuture<String> future = SettableFuture.create();
    ListenableFuture<String> badFuture =
        new ListenableFuture<String>() {
          @Override