• Dmitry Zorin
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I'm trying to accomplish OpportunityChangeTrigger challenger from trailhead but I found one error and I don't know how to address it.
The error is:
The trigger doesn't create the expected task for opportunities whose stage has been updated to 'Closed Won'.

This is my code for the trigger:
trigger OpportunityChangeTrigger on OpportunityChangeEvent (after insert) {
    List<Opportunity> opps = new List<Opportunity>();
    List<Task> taskList = new List<Task>();
    for(OpportunityChangeEvent event : Trigger.New){
        EventBus.ChangeEventHeader header = event.ChangeEventHeader;
        if(header.changeType == 'UPDATE' && event.isWon){
			Task task = new Task();
            task.subject = 'Follow up on won opportunities: ' +header.recordIds;
        insert taskList;


And this is the  test class
public class TestOpportunityChangeTrigger {
    @isTest static void testCreateAndUpdateEmployee(){
        insert new Opportunity(Name='Sell 100 Widgets', StageName='Prospecting', CloseDate=Date.today().addMonths(3));
        Opportunity[] oppList = [SELECT Id,StageName FROM Opportunity];
        for (Opportunity opp : oppList){
          opp.StageName = 'Closed Won';
          update opp;
        Task[] taskList = [SELECT Id FROM Task];
        System.assertEquals(1, taskList.size(),'The change event trigger did not create the expected task.');


I am trying to solve the challange of the HTTP and Basic Callout module of Salesforce trailhead and I am having some queries in which you could point to the right direction:

1- The challange asked us to call this URL https://th-apex-http-callout.herokuapp.com/animals/:id in method getAnimalNameById... should that URL be in this form instead of the above https://th-apex-http-callout.herokuapp.com/animals?id ? Where id is a parameter in the URL.

2- When I tried to check the solution of the challange, Salesforce generated that error for me
"Challenge Not yet complete... here's what's wrong: 
Executing the 'getAnimalNameById' method on 'AnimalLocator' failed. Make sure the method exists with the name 'getAnimalNameById', is public and static, accepts an Integer and returns a String."
despite that my class implementation has this method declared as public static String as below in the code snippet:
public class AnimalLocator {
	public static String getAnimalNameById(Integer id) {
		Http http = new Http();
		HttpRequest request = new HttpRequest();
		HttpResponse response = http.send(request);
		List<Object> animals = NULL;
		String returnValue = NULL;
		// if the request was successful, then parse the JSON response
		if (response.getStatusCode() == 200) {
			Map<String, Object> result = (Map<String, Object>) JSON.deserializeUntyped(response.getBody());
			animals = (List<Object>) result.get('animals');
		if (animals.size() > 0 && animals != NULL && id < animals.size()) {
			returnValue = (String) animals.get(id);
		return returnValue;
	} // end getAnimalNameById method
} // end AnimalLocator class

I would appreciate your help in this post.

Thank you,