when:
        def filtered = FileSystemSnapshotFilter.filterSnapshot(snapshottingFilter(include("**/*File*")).asSnapshotPredicate, unfiltered)

        then:
        filtered.is(unfiltered)
    }

    private Set<File> filteredPaths(FileSystemSnapshot unfiltered, PatternSet patterns) {
        def result = [] as Set
        def filtered = FileSystemSnapshotFilter.filterSnapshot(snapshottingFilter(patterns).asSnapshotPredicate, unfiltered)

public class FileSystemSnapshotFilter {

    private FileSystemSnapshotFilter() {
    }

    public static FileSystemSnapshot filterSnapshot(SnapshottingFilter.FileSystemSnapshotPredicate predicate, FileSystemSnapshot unfiltered) {
        DirectorySnapshotBuilder builder = MerkleDirectorySnapshotBuilder.noSortingRequired();