Hi Everyone.  I'm embarking on writing my first trigger/unit test and my test class is failing - not sure why.  If you can please provide some insight it would  be greatly appreciated.  Remember - take it easy on me I'm new to code writing =)

Scenario:  When a task is created with certain criteria (via user interface or in masse via data loader or whatever) - create a corresponding Opportunity with certain criteria.  That's basically it.

I'd like to know how I can dig deeper into what is wrong - does the debug log pick this stuff up?  I'm pretty sure the "test that the trigger worked" part of the test is screwy.  I've tried to take this as far as I can by looking up help files and looking at other posts on these boards. Thanks in advance.

Here's the trigger:

trigger insertNewDonation on Task (after insert, after update) {

List<Opportunity> listOppor = new List<Opportunity>();

for(Task t : Trigger.new)
{
if(t.Phonathon_Call_Result__c == 'Pledge' || t.Phonathon_Call_Result__c == 'Undecided')
  { 
  Opportunity o = new Opportunity();
  
  o.Amount = t.Pledge__c;
  o.CloseDate = t.ActivityDate;
  o.Name = 'Overwrite';
  o.Donation_Category__c = 'Phonathon';
  o.Contact_Email__c = t.WhoId;
  o.npe01__Contact_Id_for_Role__c = t.WhoId;
  o.AccountId = t.AccountId;
  
  if(t.Phonathon_Call_Result__c == 'Pledge'){
  o.StageName = 'Pledged';}
  else{
  o.StageName = 'Prospecting';
  }
  
listOppor.add(o);
  }
}

if(listOppor.size() > 0)
     try {
        insert listOppor; 
    } catch (system.Dmlexception e) {
        system.debug (e);
    }  

 Here's the test Apex Class

@isTest 
private class TestTaskDonationInsert {
    static testMethod void testDonationInsert() {
       
       // Prep Data
       List<Task> tasks = new List<Task>();
       for(Integer i = 0;  i < 100; i++){
           
           Task t = new Task(Subject= 'Phonathon Call' +i,Phonathon_Call_Result__c = 'Pledge', ActivityDate = date.today(), Pledge__c=100.0);
           tasks.add(t);
           
        Test.startTest();
        
       // DML Operation
        insert tasks;
        
        Test.stopTest();
           

       // Verify Data
       List<Opportunity> insertedOpps = [SELECT Amount, StageName, Donation_Category__c
                                   FROM Opportunity
                                   WHERE StageName = 'Pledged'];
    
     
       // Test that the trigger worked
       System.assertEquals('Pledged', insertedOpps[0].StageName);
    }
}
}