### Question:
ExceptionHandler { public Pane asPane() { return this.asPane(this.exception.getMessage()); } ExceptionHandler(final Throwable exception); Pane asPane(); Pane asPane(final String userReadableError); static Pane fromThrowable(final Throwable throwable); static CompletionStage<Stage> displayExceptionPane(
        final String title,
        final String readable,
        final Throwable exception
    );  }### Answer:
@Test public void asPane() { final Label errLabel = (Label) this.ERR_PANE.getChildren().filtered(node -> node instanceof Label).get(0); assertThat(errLabel.getText()).isEqualTo(this.EXCEPTION.getMessage()); }