def dirFile2 = dir1.createFile("dirFile2")
        def rootFile2 = root.createFile("rootFile2")

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

        when:
        fileTree.visit(visitor)

        then:
        visitor.visited.sort() == [rootFile1, rootFile2, dirFile2, dirFile1, dir1].sort()

        where:

        filteredPaths(unfiltered, include("**/*2")) == [root, dir1, dirFile2, subdir, rootFile2] as Set
        filteredPaths(unfiltered, include("dir1/**")) == [root, dir1, dirFile1, dirFile2, subdir, subdirFile1] as Set
        filteredPaths(unfiltered, include("*/subdir/**")) == [root, dir1, subdir, subdirFile1] as Set
        filteredPaths(unfiltered, include("dir1/dirFile1")) == [root, dir1, dirFile1] as Set
    }

    def "filters empty tree"() {