when:
        set.srcDir 'dir1'
        set.srcDir 'dir2'

        then:
        assertSetContainsForAllTypes(set, 'subdir/file1.txt')
    }

    void failsWhenSourceDirectoryIsNotADirectory() {
        File srcDir = new File(testDir, 'dir1')
        touch(srcDir)

        when:
        set.srcDir 'dir1'
        set.addToAntBuilder("node", "fileset")

        then: