then:
        def e = thrown(ModelPath.InvalidNameException)
        e.message =~ "empty string"

        when:
        ModelPath.validateName("ü")

        then:
        e = thrown(ModelPath.InvalidNameException)
        e.message =~ "first character"

        when:
        ModelPath.validateName(" ")

        then:
        e = thrown(ModelPath.InvalidNameException)
        e.message =~ "first character"