@Test
public void getSafeHtml_ActionRetract() {

    ActionRetractFactCol52 originalColumn = new ActionRetractFactCol52();
    originalColumn.setHeader("action1");
    originalColumn.setHideColumn(false);
    originalColumn.setDefaultValue(new DTCellValue52("def1"));
    ActionRetractFactCol52 newColumn = new ActionRetractFactCol52();
    newColumn.setHeader("action2");
    newColumn.setHideColumn(true);
    newColumn.setDefaultValue(new DTCellValue52("def2"));
    List<BaseColumnFieldDiff> diffs = originalColumn.diff(newColumn);
    SafeHtml result = helper.getSafeHtml(new UpdateColumnAuditLogEntry("mock user", originalColumn, newColumn, diffs));
    assertEquals(getHeaderRepre(newColumn.getHeader()) + getDiffRepre(diffs), result.asString());
}