I finally got my code to work and now I need help with my Test Class.  My Test Class is only giving me 24% code coverage.  I am not sure how to test the bottom portion of my trigger.  Please advice.  

Here is my trigger:

trigger TaskSendEmail on Task (before update) {
// Don't forget this- all triggers in SF are bulk triggers and so
// they can fire on multiple objects. So you need to process objects
// in a FOR loop.
Set<Id> CBIds = new Set<Id>();

for(Task tsk: Trigger.New)

if(tsk.RecordTypeId == '012Z00000004WFV' && tsk.Status == 'Completed')

CBIds.add(tsk.CreatedById);

// Build a map of all users who created the tasks.
Map<Id, User> userMap = new Map<Id,User>([select Name, Email from User where Id in :CBIds]);

for(Task tsk : Trigger.New){
if(!TriggerHelperClass.HasAlreadyFired()){

if(tsk.RecordTypeId == '012Z00000004WFV' && tsk.Status == 'Completed')
{


User theUser = userMap.get(tsk.CreatedById);

Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
String[] toAddresses = new String[] {theUser.Email};
mail.setToAddresses(toAddresses); // Set the TO addresses
mail.setSubject('The following Task has been Completed'); // Set the subject
// Next, create a string template. Specify {0}, {1} etc. in place of actual values.
// You can replace these values with a call to String.Format.
String template = 'The following Task has been Completed: \n\n';
template+= 'Subject: {0}\n';
template+= 'Comments: {1}\n\n';
template+= 'Click the link to access the record: https://cs11.salesforce.com/{2}\n';
String duedate = '';

if (tsk.ActivityDate==null)
duedate = '';
else
duedate = tsk.ActivityDate.format();

List<String> args = new List<String>();
args.add(tsk.Subject);
args.add(tsk.Description);
args.add(tsk.Id);


// Here's the String.format() call.
String formattedHtml = String.format(template, args);

mail.setPlainTextBody(formattedHtml);

TriggerHelperClass.setAlreadyFired();
Messaging.SendEmail(new Messaging.SingleEmailMessage[] {mail});

}
}
}
}

Here is my Test Class:

@isTest (seeAllData=true)
public class TestTaskSendEmail {

static testMethod void myUnitTest(){

Test.startTest();

Task testTask = new Task ();
testTask.OwnerId='005G0000001jWxo';
testTask.Type='Email';
testTask.Subject='Test';
testTask.ActivityDate=system.Today();
testTask.Priority='Normal';
testTask.Status='Not Started';
insert testTask;

testTask.Status ='Completed';
update testTask;

System.assertEquals (testTask.Status,'Completed');
Test.stopTest();

}
}