.getColumnHeaderDataLayer();
nattable.registerLabelOnColumnHeader(colHeaderDataLayer, 1, TEST_LABEL);
// Disable sorting on column 2 - null comparator
nattable.getConfigRegistry().registerConfigAttribute(
SortConfigAttributes.SORT_COMPARATOR, new NullComparator(),
DisplayMode.NORMAL, TEST_LABEL);
altClickColumn2Header();
// Assert no sort icon is displayed