Using ApexMocks for a class that implements Queueable Interface

Question

I am trying to write a unit test for a trigger handler method that enqueues a queueable class. I am using ApexMocks to write the unit test for this trigger method. https://github.com/financialforcedev/fflib-apex-mocks

For example , my class looks like this:

    public with sharing class DividingLogic implements Queueable {
      public String recId;

      public DividingLogic(String recId){

      }

      public void execute(QueueableContext recId){
        // calls a static method of another class

      }
}

I know that Queueable and QueueableContext both are interfaces that are part of Salesforce and I think I can use them in generating ApexMocks class. So I got started with below testing. I am trying to test if the DividingLogic class gets called once from the trigger method. I plan to check that using mock.verify() method.

public void testmethod afterInsertTest(){

    // Given
    fflib_ApexMocks mocks = new fflib_ApexMocks();
    Queueable mockQueue = (Queueable)mocks.mock(DividingLogic.class);

// When
// I am wondering how would I pass the QueueableContext here
// How do I call the execute() method of Queueable


// Then
// I want to check whether the class was enqueued from the trigger
// or called at only 1 time from the trigger. 
// ((Queueable)mocks.verify(mockQueue,1).execute(); ??


}

appreciate any insights and suggestions?

Answer 1

Good to see an apexMocks user -

The matcher to use for QueueableContext would be (QueuableContext)fflib_Match.anyObject() - that said, I'll be surprised if the StubProvider interface upon which ApexMocks is built will support queueables

If it works at all ...

// Given 
fflib_ApexMocks mocks = new fflib_ApexMocks();
Queueable mockQueue = (Queueable)mocks.mock(DividingLogic.class);

// When the queueable is added
Test.startTest();
insert new Foo__c(...); // does the System.enqueueJob
Test.stopTest();  // async executes here

// Then Verify the queueable was invoked exactly once
((Queueable) mocks.verify(mockQueue,mocks
                          .times(1)
                          .description('Queueable should start')
     ))
     .execute((QueueableContext)fflib_Match.anyObject()); 

An alternate approach to explore in lieu of ApexMocks would be to see if the AsyncApexJob with JobType = Queueable is created after

Test.startTest();
insert new Foo__c(...); // does the System.enqueueJob
Test.stopTest();  // async executes here