# File test/test_DocumentTable.rb, line 513
    def test_add_filter_unknown
      entry = {
        :params => @mount_params,
        :filter_selected => 'Apple',
        :pos => 0
      }
      @mask = :mount_mask
      @DocumentTable.entry = entry
      assert_exception(RuntimeError) {
        @DocumentTable.add_filter
      }
    end