patternSet.excludes = ["${a}*"]
        patternSet.exclude("${b}*")

        expect:
        excluded file("aaa")
        excluded file("bbb")
        included file("ccc")
    }

    def supportIsEmptyMethod() {
        expect:
        patternSet.isEmpty()
        patternSet.intersect().isEmpty()

        when:
        patternSet = new PatternSet()
        patternSet.include { false }
        then: