@Test
public void testAdd_ColumnField() {

    RowAndFamilyAddingSolrUpdateWriter updateWriter = new RowAndFamilyAddingSolrUpdateWriter(null, "_col_",
            uniqueKeyFormatter, keyValue, delegateWriter);
    
    doReturn(new byte[0]).when(keyValue).getFamilyArray();
    doReturn("_famname_").when(uniqueKeyFormatter).formatFamily(any(byte[].class));
    updateWriter.add(solrDocument);
    
    verify(solrDocument).addField("_col_", "_famname_");
    verify(delegateWriter).add(solrDocument);
}