Resource resource = createResource(1);
VisualItemValueResolver delegatingResolver = mockDelegatingResolver(slots[1]);
when(
delegatingResolver.resolve(any(VisualItem.class),
any(VisualItemValueResolverContext.class))).thenReturn(
"a1", "a2");
underTest.setResolver(slots[0], delegatingResolver);
underTest.setResolver(slots[1], mockResolverThatCanAlwaysResolve());