code: @Test public void should_map_rows_with_set() throws Exception {
    Set<String> followers=new HashSet<String>();
    def1=ColumnDefinitionBuilder.buildColumnDef("keyspace","table","followers",DataType.set(DataType.text()));
    columnDefs=ColumnDefinitionBuilder.buildColumnDefinitions(def1);
    when(row.getColumnDefinitions()).thenReturn(columnDefs);
    when(row.getSet("followers",String.class)).thenReturn(followers);
    List<TypedMap> result=mapper.mapRows(Arrays.asList(row));
    assertThat(result).hasSize(1);
    TypedMap line=result.get(0);
    assertThat(line).hasSize(1);
    assertThat(line.get("followers")).isSameAs(followers);
  }
  