assertDirectorySnapshot(s4, other)
        assertPartialDirectoryNode(s2, parent)
        flatten(s4) == [parent.path, "1:dir1", "2:child1", "1:dir2", "1:dir3", "1:dir4"]
    }

    def "splits and merges prefixes as directories are added"() {
        def parent = tmpDir.createDir()
        def dir1 = parent.createDir("dir1")
        def dir1dir2 = dir1.createDir("dir2")