public final AssertThat withMaterializations(String model,

        Function<JsonBuilder, List<Object>> materializations) {

      final JsonBuilder builder = new JsonBuilder();

      final List<Object> list = materializations.apply(builder);

      final String buf =

          "materializations: " + builder.toJsonString(list);

      final String model2;

      if (model.contains("defaultSchema: 'foodmart'")) {

        model2 = model.replace("]",

            ", { name: 'mat', "

            + buf

            + "}
"

            + "]");

      } else if (model.contains("type: ")) {

        model2 = model.replace("type: ",

            buf + ",
"

            + "type: ");

      } else {

        throw new AssertionError("do not know where to splice");

      }

      return withModel(model2);

    }