then:
        containerHas container, "subTypeOne", "subTypeTwo"
    }

    def "returns all elements when filtered by parent type"() {
        when:
        def container = parent.containerWithType(Type)

        then:
        containerHas container, "otherSubType", "subTypeOne", "subTypeTwo", "typeOne", "typeTwo"
    }

    def "created elements are typed"() {
        when: