underTest = helper.createTestVisualizationModel();
textSlot = helper.getSlots()[0];
numberSlot = helper.getSlots()[1];
Resource r1 = createResource(1);
r1.putValue(NUMBER_PROPERTY_1, new Double(0));
r1.putValue(TEXT_PROPERTY_1, "value2");
Resource r2 = createResource(2);
r2.putValue(NUMBER_PROPERTY_1, new Double(4));
r2.putValue(TEXT_PROPERTY_1, "value2");
Resource r3 = createResource(3);
r3.putValue(NUMBER_PROPERTY_1, new Double(8));
r3.putValue(TEXT_PROPERTY_1, "value2");
helper.getContainedResources().addAll(toResourceSet(r1, r2, r3));
underTest.setCategorizer(new ResourceByPropertyMultiCategorizer(
TEXT_PROPERTY_1));
}