Hi there, 
i want to upload my testclass or a new Trigger. Everytime i want to validate the testclas, i get this error message :

System.AssertException: Assertion Failed: Expected: 01sD0000000xxxxx, Actual: null 

The ID is a pricebook. Any advise ?  Thanks for your help guys.  The Code blow is my testclass 


@isTest
public class UpdateLorAccRelatedtoTaskTest 
{
    static testMethod void testMethod1()
    {        
        Lead l = new Lead();
     
        l.LastName = 'Batman';
        l.LeadSource = 'Import';
        l.company ='Batman GmbH';
        l.country ='Deutschland';
        l.Status = 'qualified';
        l.PostalCode ='00000';
        l.Phone ='003030';
        l.LeadSource = 'Import';
        l.Time_Task__c = Date.valueOf('2013-05-05');
        
        insert l;
        

        Task t = new Task();
        
        t.whoId = l.Id;
        t.Subject='Demotermin';  
        t.Status = 'Nicht Begonnen';
        t.priority = 'Normal';
        t.ActivityDate = Date.valueOf('2013-05-06');
        
        insert t; 
        t.Subject='Demotermin1';
        t.ActivityDate = Date.valueOf('2013-05-07');
      
        update t;
        
        
        Account acc = new Account();
        
        acc.name = 'Test';
        acc.billingCountry = 'Deutschland';
        acc.billingPostalCode = '00000';
        acc.Type = 'Interessent';
        acc.Leadquelle__c = 'Import';
        acc.Time_Task__c = Date.valueOf('2013-06-05');
        
        insert acc;
        
        Task tt = new Task ();
        tt.whatId = acc.Id;
        tt.Subject='Demotermin';
        tt.Status = 'Nicht Begonnen';
        tt.priority = 'Normal';
        tt.ActivityDate = Date.valueOf('2013-05-07');
        
        insert tt;
        
        tt.Subject = 'Demotermin2';
        tt.ActivityDate = Date.valueOf('2013-07-07');
        
        update tt;       
    }
}