### Question:
DMNGridPanelControlImpl extends AbstractCanvasControl<AbstractCanvas> implements DMNGridPanelControl { @Override protected void doInit() { }  @Override void bind(final DMNSession session); @Override DMNGridPanel getGridPanel();  }### Answer:
@Test public void testDoInit() { assertNull(control.getGridPanel()); control.doInit(); assertNull(control.getGridPanel()); }