}

    def 'generates failures when extra modules visited'() {
        given:
        startWithState([])
        addVisitedNode(newId(mid, '1.0'))

        when:
        def failures = visitor.collectLockingFailures()

        then:
        failures.size() == 1
        failures.each {
            assert it.problem instanceof LockOutOfDateException

     *
     * @return the existing failures augmented with any locking related one
     */
    public Set<UnresolvedDependency> collectLockingFailures() {
        if (dependencyLockingState.mustValidateLockState()) {
            if (!modulesToBeLocked.isEmpty() || !extraModules.isEmpty() || !forcedModules.isEmpty()) {
                lockOutOfDate = true;