@Test
public void testClickPrevious() {

  clickOn(previousNextButtons.getPreviousButton());
  WaitForAsyncUtils.waitForFxEvents();
  assertEquals("Previous should have been called once", -1, previousNext.index);
  verifyThat("." + PreviousNextButtons.PREVIOUS_BUTTON_STYLE_CLASS, (ToggleButton t) -> !t
      .isSelected());
}