expect:
        assertSetContainsForFileSet(collection, toSet("f1", "f2"))
        assertSetContainsForMatchingTask(collection, toSet("f1", "f2"))
    }

    void includesFilesAndContentsOfDirectoriesWhenConvertedToTreeAndAddedToAntBuilder() {
        TestFile testDir = this.testDir.getTestDirectory()
        TestFile file1 = testDir.file("f1").createFile()
        TestFile dir1 = testDir.file("dir1").createDir()