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I have a helper method in my code called canQueryObject, and that method returns a boolean. I have some code that calls the method via the following line of code:

if(!myObjectHelper.canQueryObject(Schema.SObjectType.<<objectType>>)){ ... }

I'd like to test some scenarios where the scenario is false. Is there a way I can use Mock or Stubs in a unit-test to set canQueryObject to false?

I typically use a fairly simple pattern and don't bring in a framework. It would look something like the following:

public virtual with sharing class MyObjectHelper

{

    static MyObjectHelper instance = new MyObjectHelper();

    @TestVisible static void setMock(MyObjectHelper mock) { instance = mock; }



    public static Boolean canQueryObject(SObjectType sObjectType)

    {

        return instance.getCanQueryObject(sObjectType);

    }



    // the two method names cannot match or you will get a compile fail

    protected virtual Boolean getCanQueryObject(SObjectType sObjectType)

    {

        return sObjectType.getDescribe().isQueryable();

    }

}

Then in your test, you can have a mock return always true or always false, as you wish.

@IsTest

class MyObjectHelperTests

{

    class HelperMock extends MyObjectHelper

    {

        Boolean isQueryable = true;

        protected override Boolean getCanQueryObject(SObjectType sObjectType)

        {

            return isQueryable;

        }

    }



    @IsTest static void testCannotQuery()

    {

        HelperMock mock = new HelperMock();

        mock.isQueryable = false;

        MyObjectHelper.setMock(mock);



        Test.startTest();

            Boolean canQuery = MyObjectHelper.canQueryObject(...);

        Test.stopTest();



        system.assertEquals(false, canQuery, 'Some informative message');

    }

}