Hello,

I'm having trouble with apex tests.

As test functions are pretty repetitive, I wanted to code them in a seperated class and call them from my "actual" test class.

Problem is, when i'm developping in a sandbox, and coding tests for a batch class, I call a function from my "separated" test class, to setup my tests objects and everything works fine (tests are ok, code coverage too ...)
But when I try deploying through a Change Set the deployment status return a "Fatal Error" and 0% code coverage.

If I replace the call to my "external" test function, by the actual code of this function, it works during deployment.
see details within *lf_billingEvolutions_updateSubs_test* class code below.

During my deploy I upload all the classes needed.
In my case I have the following :
 

global class lf_billingEvolutions_updateSubs implements
    Database.Batchable<sObject>, Database.Stateful {

    // instance member to retain state across transactions
    global Integer recordsProcessed = 0;

    global Database.QueryLocator start(Database.BatchableContext bc) {
        return Database.getQueryLocator(
            [my code]
        );
    }

    global void execute(Database.BatchableContext bc, List<sofactoapp__Poste_d_abonnement__c> list_subLI_scope){
        // process each batch of records
        List<sofactoapp__Poste_d_abonnement__c > subLI_to_update = new List<sofactoapp__Poste_d_abonnement__c >();
        [my code]
    }

    global void finish(Database.BatchableContext bc){
    }

}

And the corresponding test class :
 

@isTest
public class lf_billingEvolutions_updateSubs_test {

    @testSetup
    static void test_sub_update_setup() {


        // This works in sandbox but not during deployment :
		    lf_testCommonFunctions.lf_billingEvolutions_updateSubs_initDataSet();

        // This works in sandbox and during deployment :
        [code to create tests objects] // same that the code whithin the lf_billingEvolutions_updateSubs_initDataSet function...
    }

    static testmethod void test_sub_update() {
        Test.startTest();
        lf_billingEvolutions_updateSubs batch_sub_update = new lf_billingEvolutions_updateSubs();
        Id batchId = Database.executeBatch(batch_sub_update, 10);
        Test.stopTest();

        // after the testing stops, assert records were updated properly
        System.assertEquals(1, 1); // just testing..

    }

}

My "separated" test class with often used functions :
 

@isTest
public with sharing class lf_testCommonFunctions {

    public static void lf_billingEvolutions_updateSubs_initDataSet(){
        [code to create tests objects]
    }

}

Can you help me having a separated class that contain all my function required to init test objects that I could call within any other specific test class ?
Do you see any problem with the code I provided, or the method detailled ?

Thanks in advance.