Hi!

I have written a trigger that updates a case when an associated lead is deleted. 

The struggle I am having is I can't seem to figure out how to test the delete part. Below is my trigger and my class. I have 52% coverage. I have bolded the lines that are not covered. The community helped me earlier on a test class, and I thought I had a better handle on it. But, this is stumping me! 

Any help is appreciated. 

Best, 
Tasia

trigger UpdateCaseWhenLeadDeleted on Lead (after delete) {
if(Trigger.isAfter && Trigger.isDelete)
    {
       List<Case> listCase = new List<Case>();
        Set<Id> DeletedLeads = new Set<Id>();
        Map<String,Boolean> mapLeadDelete = new Map<String, Boolean>();
        for(Lead objLead : Trigger.old)
        {
            if(objLead.IsDeleted)
            {
            DeletedLeads.add(objLead.Id); 
           mapLeadDelete.put(objLead.Id, objLead.IsDeleted);     
        }
        }    
        for(Case objCase : [SELECT Lead__c FROM Case WHERE Lead__c IN : DeletedLeads])    
        {
            if(mapLeadDelete.containsKey(objCase.Lead__c))
        {       
            objCase.Lead__c = null;
            objCase.Status = 'Denied';
            objCase.Type = 'Web Account Denied';
            listCase.add(objCase);
        }
        }
        update listCase;
    }
}

@isTest
public class UpdateCaseWhenLeadDeletedTest {

    private static testMethod void LeadDeletedTest(){
        //create a Lead
        Lead lead=new Lead(LastName='Test',FirstName='Tester',Status='Known', Company = 'CD Test');
        insert lead;
        // create a Case
        Case cscase=new Case(Status = 'New', Priority = 'Medium', Origin = 'Email');
        cscase.Lead__c = lead.Id;
        insert cscase;
       
        //delete Lead
        delete lead;
        
        List<Case> lstCase = [Select id ,Status, Type from Case where Lead__c =:lead.id ];
        System.assert(lstCase.size() > 0 );
        System.assertEquals('Denied', lstCase[0].Status);
        System.assertEquals('Web Account Denied', lstCase[0].Type);
    }
}