Getting exception in Test Class

Question

I'm getting exception in Test class Assertion failed.

Test Class:

 @isTest (SeeAllData = False)
public class OpportunityTriggerHandlerTest {
    
    @TestSetup
    public static void testDataCreation(){
        
        //Account creation for Opportunity
        Account acc = new Account();
        acc.name = 'TestAccount';
        insert acc;
        
        
        //Opportunity Creation
        Opportunity oppty = new Opportunity();
        oppty.Name = 'TestOppty';
        oppty.AccountId = acc.Id;
        oppty.SAP_Account__c = sapAcc.Id;
        oppty.CloseDate = Date.today();
        oppty.stageName = 'Cultivate';
        oppty.Pricebook2Id = pricebookId;
        
        insert oppty;        
        System.assertEquals(oppty.Name,'TestOppty');
        
        //Create Clone of 'TestOppty'
        Opportunity cloneOpportunity = new Opportunity();
        cloneOpportunity.Name = 'Clone-TestOppty';
        cloneOpportunity.AccountId = acc.Id;
        cloneOpportunity.SAP_Account__c = sapAcc.Id;
        cloneOpportunity.ParentOpportunityId__c = oppty.Id; 
        cloneOpportunity.Child_Cloned_Opportunity__c = true; 
        cloneOpportunity.CloseDate = Date.today();
        cloneOpportunity.stageName = 'Cultivate';
        cloneOpportunity.Pricebook2Id = pricebookId;
        
        insert cloneOpportunity;
        System.assertEquals(cloneOpportunity.Name,'Clone-TestOppty');
        
    }
    
    @isTest
    private static void deleteCloneOpportunitiesPositiveTest(){
        
        List<Opportunity> parentOpportunityList = [SELECT Id, Name FROM Opportunity WHERE Name = 'TestOppty']; 
        List<Opportunity> cloneOpportunityList = [SELECT Id, Name FROM Opportunity WHERE Name = 'Clone-TestOppty'];

        Test.startTest();
        delete parentOpportunityList; 
        OpportunityTriggerHandler.deleteCloneOpportunities(parentOpportunityList); 
        System.assertEquals(0, cloneOpportunityList.size());
        Test.stopTest();
        
    }

Apex Class:

public class OpportunityTriggerHandler {
        
    public static void deleteCloneOpportunities(List<Opportunity> oldOpportunityList){
        
        Set<id> parentOpportunityIdSet = new Set<id>();
        for(Opportunity oppObj : oldOpportunityList){
            parentOpportunityIdSet.add(oppObj.id);
            
        }
        
        List<Opportunity> childClonedOpportunities = new List<Opportunity>([select id from Opportunity where ParentOpportunityId__c in : parentOpportunityIdSet]);
        
        if(childClonedOpportunities!=null && !childClonedOpportunities.isEmpty()){
          
            delete childClonedOpportunities;            
        }
        
    }
}

Apex Class Handles if Parent Opportunity is deleted then it's related cloned opportunity is also deleted.

But Test Class is failing because of following error.

System.AssertException: Assertion Failed: Expected: 0, Actual: 1

Answer 1

Each Test method executes in it's own execution context, and all DML performed are rolled back. Therefore the changes you do in one test do not carry over to the "next test".

One suggestion if data is shared across multiple test is to use @TestSetup so you can set up your data and then do multiple tests over that data.