given:
        def root = temporaryFolder.createDir("root")
        def patterns = new PatternSet()
        def owner = Stub(FileTreeInternal)
        def visitor = Mock(MinimalFileTree.MinimalFileTreeStructureVisitor)

        def fileTree = new DirectoryFileTree(root, patterns, TestFiles.fileSystem(), false)

        when:
        fileTree.visitStructure(visitor, owner)

        then: