def successful = Mock(DependencyGraphEdge) {
            getSelector() >> Stub(DependencyGraphSelector) {
                getResultId() >> 4L
                getRequested() >> requested
            }
            getFromVariant() >> 55L
            getFailure() >> null
            getSelected() >> 12L
            getSelectedVariant() >> 123L
            getReason() >> ComponentSelectionReasons.requested()
        }

        when:

    ComponentSelectionReason getReason();

    boolean isConstraint();

    /**
     * Returns the simple id of the source variant, as per {@link ResolvedGraphVariant#getNodeId()}.
     */
    Long getFromVariant();

    /**
     * Returns the simple id of the selected variant, as per {@link ResolvedGraphVariant#getNodeId()}.
     */
    @Nullable
    Long getSelectedVariant();

        encoder.writeSmallLong(value.getSelector().getResultId());
        encoder.writeBoolean(value.isConstraint());
        encoder.writeSmallLong(value.getFromVariant());
        if (value.getFailure() == null) {
            if (value.getSelectedVariant() != null) {
                encoder.writeByte(SUCCESSFUL);
                encoder.writeSmallLong(value.getSelected());

            DependencyResult dependencyResult;
            ResolvedVariantResult fromVariant = fromComponent.getVariant(d.getFromVariant());
            if (fromVariant == null) {
                throw new IllegalStateException("Corrupt serialized resolution result. Cannot find variant (" + d.getFromVariant() + ") for " + (d.isConstraint() ? "constraint " : "") + fromComponent + " -> " + d.getRequested().getDisplayName());
            }

    public ModuleVersionResolveException getFailure() {
        return failure;
    }

    @Override
    public boolean isConstraint() {
        return constraint;
    }

    @Override
    public Long getFromVariant() {
        return fromVariant;
    }

    @Override
    public Long getSelectedVariant() {
        return targetVariant;
    }

        failure = failure == null ? null : new ModuleVersionResolveException(moduleVersionSelector, failure)
        return Stub(ResolvedGraphDependency) {
            getRequested() >> selector
            getFromVariant() >> id(from)
            getSelected() >> id(selected)
            getSelectedVariant() >> id(selected)
            getFailure() >> failure
        }
    }

    private Long id(String module) {

        return selector.getSelectionReason();
    }

    @Override
    public boolean isConstraint() {
        return isConstraint;
    }

    @Override
    public Long getFromVariant() {
        return from.getNodeId();
    }

    @Nullable
    private ComponentState getSelectedComponent() {
        return selector.getTargetModule().getSelected();
    }

    @Override