QueueableHandler for HttpCalloutMock class throws "Callout loop not allowed" error when Test classes are run
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QueueableHandler for HttpCalloutMock class throws "Callout loop not allowed" error when Test classes are run

Last updated 2016-12-08 ·Reference W-2701771 ·Reported By 21 users

Fixed - Spring '16

When testing a callout with HttpCalloutMock class from a Queueable Apex instance there is a "Callout loop not allowed" exception thrown and captured in the debug logs.

Create a class that perform a remote callout:

public class PirateTranslator {
public static String translate(String sourceText) {
String endpoint ='http://isithackday.com/arrpi.php?format=text&text=' + EncodingUtil.urlEncode( sourceText,'UTF-8');
HttpRequest req = new HttpRequest();
Http h = new Http();
HttpResponse res = h.send(req);
return res.GetBody();

Create a “caller” class that will call this function from a queueable Apex call:

public class TranslateCaller implements queueable, Database.allowsCallouts{
public void execute(QueueableContext context) {
system.debug(PirateTranslator.translate('Hello Friend'));

Now, create a class to mock the call:

public class MockTranslate implements HttpCalloutMock {
public HTTPResponse respond(HTTPRequest req)
String requestBody = req.getBody();
HttpResponse res = new HttpResponse();
res.setHeader('Content-Type', 'text');
res.setBody(requestBody + ' mocked result');
return res;

Create the following unit test:
public class TestTranslate {
public static testmethod void testQueueable() {
Test.setMock(HttpCalloutMock.class, new MockTranslate());
TranslateCaller t = new TranslateCaller();

None at this time

Is it Fixed?

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