### Question:
ExpressionContainerUIModelMapper extends BaseUIModelMapper<Expression> { @Override public void toDMNModel(final int rowIndex, final int columnIndex, final Supplier<Optional<GridCellValue<?>>> cell) { throw new UnsupportedOperationException("ExpressionContainerUIModelMapper does not support updating DMN models."); } ExpressionContainerUIModelMapper(final GridCellTuple parent,
                                            final Supplier<GridData> uiModel,
                                            final Supplier<Optional<Expression>> dmnModel,
                                            final Supplier<String> nodeUUID,
                                            final Supplier<HasExpression> hasExpression,
                                            final Supplier<Optional<HasName>> hasName,
                                            final Supplier<Boolean> isOnlyVisualChangeAllowedSupplier,
                                            final Supplier<ExpressionEditorDefinitions> expressionEditorDefinitions,
                                            final Supplier<ExpressionGridCache> expressionGridCache,
                                            final ListSelectorView.Presenter listSelector); @Override void fromDMNModel(final int rowIndex,
                             final int columnIndex); @Override void toDMNModel(final int rowIndex,
                           final int columnIndex,
                           final Supplier<Optional<GridCellValue<?>>> cell);  }### Answer:
@Test(expected = UnsupportedOperationException.class) public void testToDMNModelIsUnsupported() { setup(false); mapper.toDMNModel(0, 0, () -> null); }