return variantMetadataRules;
    }

    @Override
    public MutableComponentVariant addVariant(String variantName, ImmutableAttributes attributes) {
        return addVariant(new MutableVariantImpl(variantName, attributes));
    }

    @Override
    public MutableComponentVariant addVariant(MutableComponentVariant variant) {
        if (newVariants == null) {

            configurations.all {
                resolutionStrategy {
                   capabilitiesResolution.withCapability('org:testB') {
                      select(candidates.find { it.variantName == 'runtimeAlt'})
                      because "we want runtimeAlt with 'special'"
                   }
                }
            }
        """

        when:
        repositoryInteractions {

        final Set<File> files = new LinkedHashSet<>();
        List<Throwable> failures;

        @Override
        public void visitArtifact(DisplayName variantName, AttributeContainer variantAttributes, ImmutableCapabilities capabilities, ResolvableArtifact artifact) {
            try {
                ResolvedArtifact resolvedArtifact = artifact.toPublicView();

        "ResolvedVariantResult"        | "new DefaultResolvedVariantResult(new DefaultModuleComponentIdentifier(DefaultModuleIdentifier.newId('group', System.getProperty('n')), '1.0'), Describables.of('variantName'), services.get(ImmutableAttributesFactory).of(Attribute.of('some', String.class), System.getProperty('n')), ImmutableCapabilities.of(new DefaultImmutableCapability('group', System.getProperty('n'), '1.0')), null)"