when:
        watchingVirtualFileSystem.updateRootUnderLock { root -> nonEmptySnapshotHierarchy }
        watchingVirtualFileSystem.afterBuildStarted(WatchMode.DISABLED, VfsLogging.NORMAL, WatchLogging.NORMAL, buildOperationRunner)
        then:
        0 * _

        watchingVirtualFileSystem.root == emptySnapshotHierarchy

        when:

                watchRegistry.virtualFileSystemContentsChanged(removedSnapshots, addedSnapshots, newRoot)
            ));
        }
    }

    @Override
    public boolean afterBuildStarted(
        WatchMode watchMode,
        VfsLogging vfsLogging,
        WatchLogging watchLogging,
        BuildOperationRunner buildOperationRunner
    ) {