visualizationModel.setResolver(slot,
mockResolverThatCanResolveExactResourceSet(resources1));
ResourceSet allResources = createResources(TYPE_1);
allResources.addAll(resources1);
allResources.addAll(resources2);
helper.addToContainedResources(allResources);
assertThat(underTest.getVisualItems(allResources),
containsVisualItemsForExactResourceSets(resources1));