code: @Test public void should_map_rows_with_map() throws Exception {
    Map<BigInteger,String> preferences=new HashMap<BigInteger,String>();
    def1=ColumnDefinitionBuilder.buildColumnDef("keyspace","table","preferences",DataType.map(DataType.varint(),DataType.text()));
    columnDefs=ColumnDefinitionBuilder.buildColumnDefinitions(def1);
    when(row.getColumnDefinitions()).thenReturn(columnDefs);
    when(row.getMap("preferences",BigInteger.class,String.class)).thenReturn(preferences);
    List<TypedMap> result=mapper.mapRows(Arrays.asList(row));
    assertThat(result).hasSize(1);
    TypedMap line=result.get(0);
    assertThat(line).hasSize(1);
    assertThat(line.get("preferences")).isSameAs(preferences);
  }
  