While I am working on my Apex Specialist super badge, I am got this error message while I am testing my WebService class. Here is the Callout class:

public with sharing class WarehouseCalloutService {

private static final String WAREHOUSE_URL = 'https://th-superbadge-apex.herokuapp.com/equipment';

public static void runWarehouseEquipmentSync(){
    Http http = new Http();
    HttpRequest request = new HttpRequest();
    HttpResponse response = http.send(request);
    if (response.getStatusCode() == 200) {
        List<Object> results = (List<Object>) JSON.deserializeUntyped(response.getBody());
        List<Product2> equipmentList = new List<Product2>();
        for(Object obj: results){
            Map<String, Object> mapJson = (Map<String, Object>)obj;
            Product2 product = new Product2();

            Integer maintenanceperiod = (Integer)mapJson.get('maintenanceperiod');               
            Integer Lifespan = (Integer)mapJson.get('lifespan');
            Integer Cost = (Integer)mapJson.get('cost');
            Boolean replacement = (Boolean)mapJson.get('replacement');
            Integer quantity = ((Integer)mapJson.get('quantity'));

            product.Replacement_Part__c = replacement;
            product.Current_Inventory__c = quantity;
            product.Name = (String)mapJson.get('name');
            product.Maintenance_Cycle__c = maintenanceperiod;
            product.Lifespan_Months__c = Lifespan;
            product.Cost__c = Cost;
            product.Warehouse_SKU__c = (String)mapJson.get('sku');
            Product.ProductCode = (String)mapJson.get('_id');
            upsert equipmentList;

Here is my test class:

private class WarehouseCalloutServiceTest {

   @isTest static void testGetCallout() {

    Boolean expectedReplacement = false;
    String expectedName = 'Generator 3000 kW';
    String expectedSku = '100071';
    Integer expectedMaintenanceperiod = 345;
    Integer expectedLifespan = 110;
    Integer expectedCost = 5000;
    Integer expectedQuantity = 5;

    Test.setMock(HttpCalloutMock.class, new WarehouseCalloutServiceMock());

    Product2 equipment = [SELECT Id, Current_Inventory__c, Replacement_Part__c, Name, Maintenance_Cycle__c, Lifespan_Months__c, Cost__c, Warehouse_SKU__c
                          FROM Product2];
    System.assertEquals(equipment.Current_Inventory__c, expectedQuantity);                
    System.assertEquals(equipment.Replacement_Part__c, expectedReplacement);
    System.assertEquals(equipment.Name, expectedName);
    System.assertEquals(equipment.Maintenance_Cycle__c, expectedMaintenanceperiod);
    System.assertEquals(equipment.Lifespan_Months__c, expectedLifespan);
    System.assertEquals(equipment.Cost__c, expectedCost);
    System.assertEquals(equipment.Warehouse_SKU__c, expectedSku);


Mock class:

global class WarehouseCalloutServiceMock implements HttpCalloutMock {
// implement http mock callout

    global HTTPResponse respond(HTTPRequest request) {
    // Create a fake response
    HttpResponse response = new HttpResponse();
    response.setHeader('Content-Type', 'application/json');
    response.setBody('{"_id":"55d66226726b611100aaf744","replacement":false,"quantity":5,"name":"Generator 3000 kW","maintenanceperiod":345,"lifespan":110,"cost":5000,"sku":"100071"}');
    return response; 

Error screenshot:

enter image description here

This looks like pretty straight forward and I am not sure why I am seeing this error. I do not want to take someone's work and complete my badge, so trying to understand my mistake here and a possible workaround.

  • Do you have a time number where this error is thrown? Feb 7, 2019 at 1:13
  • @ZackWalton Added the screenshot. Feb 7, 2019 at 1:17
  • The problem is in your mock, I think. Can we see that?
    – sfdcfox
    Feb 7, 2019 at 1:20
  • @sfdcfox Updated with the Mock class too. Feb 7, 2019 at 1:30

1 Answer 1


Your code is just fine, your mock class seems to be the culprit. Make sure you're returning JSON like the original, including the outer [...], which makes it a list. If the first character in your JSON is {, it will be a Map<String, ANY>.

Note: Your System.assertEquals method parameters are backwards; the first value is the expected value, the second is the actual value. You'll get nonsensical errors if the test fails from the assertions otherwise.

  • Well, I found the mistake. yes, the mock class is the culprit. Feb 7, 2019 at 1:47

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