1 * attributeMatcher.matches(_, _, _) >> transformedVariants
    }

    ResolvedVariantSet variantSetOf(List<ResolvedVariant> variants) {
        return Mock(ResolvedVariantSet) {
            asDescribable() >> Describables.of("mock producer")
            getVariants() >> variants
            getOverriddenAttributes() >> ImmutableAttributes.EMPTY

            }

            if (variants.isEmpty() && spec.getAllowNoMatchingVariants()) {
                return ResolvedArtifactSet.EMPTY;
            }

            ResolvedVariantSet variantSet = new DefaultResolvedVariantSet(componentId, producerSchema, overriddenAttributes, variants);