*/
public class VersionHierarchyRoot {
    private final CaseSensitivity caseSensitivity;
    private final VersionHierarchy rootNode;

    public static VersionHierarchyRoot empty(long version, CaseSensitivity caseSensitivity) {
        return new VersionHierarchyRoot(VersionHierarchy.empty(version), caseSensitivity);
    }

    // Mutable state, changes need to be guarded by updateLock
    protected volatile SnapshotHierarchy root;
    private volatile VersionHierarchyRoot versionHierarchyRoot;

    protected AbstractVirtualFileSystem(SnapshotHierarchy root) {
        this.root = root;
        this.versionHierarchyRoot = VersionHierarchyRoot.empty(0, root.getCaseSensitivity());
    }

    protected void underLock(Runnable runnable) {
        updateLock.lock();

 */

package org.gradle.internal.vfs.impl

import org.gradle.internal.snapshot.CaseSensitivity
import spock.lang.Specification

class VersionHierarchyRootTest extends Specification {
    def versionHierarchyRoot = VersionHierarchyRoot.empty(0, CaseSensitivity.CASE_SENSITIVE)

    def "correct versions for: initial state: #initialState, invalidate location: #invalidateLocation"() {
        updateVersions(*initialState)