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Standardized KHR_interactivity testing using custom events

The structure below outlines how to configure glTF interactivity test assets using a standardized approach. It leverages a custom event with the ID onTestEnd to indicate when a test is complete and to provide result details, including information about the test outcome.

Extras Data

To help test runners understand the expected duration of a test, test assets SHOULD include a property at the graph entry level of the KHR_interactivity extension the anticipated completion time in milliseconds.

KHR_interactivity:{
  graphs: [
    {
      extras: {
        expectedTestTime: number

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public class ObjectToJson {
    public static void main(String[] args) throws IOException {
        ObjectMapper objectMapper = new ObjectMapper();
        ClassRoom classRoom1 =  new ClassRoom("Math 101", Arrays.asList(new Person("Bill", 12), new Person("John", 15), new Person("Matt", 10)));
        ClassRoom classRoom2 =  new ClassRoom("English 101", Arrays.asList(new Person("Bob", 13), new Person("Alex", 16), new Person("Matt", 10)));
        ClassRoom classRoom3 =  new ClassRoom("French 101", Arrays.asList(new Person("Jill", 9), new Person("John", 15), new Person("John", 15)));


        //write it
        String classRoomJson = objectMapper.writeValueAsString(new ClassRoom[]{classRoom1, classRoom2, classRoom3});

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public class ObjectToJson {
    public static void main(String[] args) throws IOException {
        ObjectMapper objectMapper = new ObjectMapper();
        ClassRoom classRoom1 =  new ClassRoom("Math 101", Arrays.asList(new Person("Bill", 12), new Person("John", 15), new Person("Matt", 10)));
        ClassRoom classRoom2 =  new ClassRoom("English 101", Arrays.asList(new Person("Bob", 13), new Person("Alex", 16), new Person("Matt", 10)));
        ClassRoom classRoom3 =  new ClassRoom("French 101", Arrays.asList(new Person("Jill", 9), new Person("John", 15), new Person("John", 15)));

        //write it
        String classRoomJson = objectMapper.writeValueAsString(new ClassRoom[]{classRoom1, classRoom2, classRoom3});
        System.out.println(classRoomJson);

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public class Person {
    private String name;
    private int age;


    public Person() {
    }

    public Person(String name, int age) {
        this.name = name;

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public class ClassRoom {
    private String className;
    private List<Person> members;

    public ClassRoom() {
    }

    public ClassRoom(String className, List<Person> members) {
        this.className = className;
        this.members = members;

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public class ParseJson {
    public static void main(String[] args) throws IOException {
        File jsonFile = new File("src/main/java/parsejson/jsonExample");
        String content = readFile(jsonFile);

        ObjectMapper objectMapper = new ObjectMapper();

        JsonNode jsonNode = objectMapper.readTree(content);
        jsonNode.get("restaurants").forEach(
                (restaurant)->{restaurant.get("menu").get("menuitem").forEach(

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public class ParseJson {
    public static void main(String[] args) throws IOException {
        File jsonFile = new File("src/main/java/parsejson/jsonExample");
        String content = readFile(jsonFile);
    }

    public static String readFile(File file) throws IOException {
        BufferedReader reader = new BufferedReader(new FileReader(file));
        StringBuilder stringBuilder = new StringBuilder();
        String line;