formatter.node("thing ")
        formatter.appendType(Thing.genericInterfaces[0])

        then:
        formatter.toString() == toPlatformLineSeparators("thing List<TreeFormatterTest.Thing.Nested>")
    }

    def "can append wildcard type name"() {
        when:
        formatter.node("thing ")
        formatter.appendType(Thing.genericInterfaces[1])

        then:

        Map<Type, Type> collectedTypes = new HashMap<>();
        Types.walkTypeHierarchy(implementationType, type -> {
            for (Type genericInterface : type.getGenericInterfaces()) {
                if (collectTypeParameters(genericInterface, foundType, collectedTypes, typeArgumentIndex)) {
                    return TypeVisitResult.TERMINATE;
                }
            }