GridLienzoScrollHandler { DefaultGridLayer emptyLayer() { if (Objects.isNull(emptyLayer)) { emptyLayer = new DefaultGridLayer(); } return emptyLayer; } GridLienzoScrollHandler(final GridLienzoPanel panel); void init(); Integer scrollbarWidth(); Integer scrollbarHeight(); void refreshScrollPosition(); void setBounds(final Bounds bounds);  }
@Test public void testEmptyLayerReuse() { Assertions.assertThat(gridLienzoScrollHandler.emptyLayer()).isEqualTo(gridLienzoScrollHandler.emptyLayer()); }
@Test public void testEmptyLayer() { assertTrue(gridLienzoScrollHandler.emptyLayer() != null); }