### Question:
SelectionUtils { public static boolean isMultiSelect(final GridData uiModel) { return uiModel.getSelectedCells().size() > 1; }  static boolean isMultiSelect(final GridData uiModel); static boolean isMultiRow(final GridData uiModel); static boolean isMultiColumn(final GridData uiModel); static boolean isMultiHeaderColumn(final GridData uiModel);  }### Answer:
@Test public void testIsMultiSelectZeroSelections() { assertThat(SelectionUtils.isMultiSelect(uiModel)).isFalse(); }
@Test public void testIsMultiSelectSingleSelection() { uiModel.selectCell(0, 0); assertThat(SelectionUtils.isMultiSelect(uiModel)).isFalse(); }
@Test public void testIsMultiSelectMultipleSelections() { uiModel.selectCell(0, 0); uiModel.selectCell(0, 1); assertThat(SelectionUtils.isMultiSelect(uiModel)).isTrue(); }