So I've come to realize that there are two errors that I am learning to dislike very much...

1)  Easilly the one I dislike the most is:  "System.NullPointerException: Attempt to de-reference a null object"

2) The second has become:  Save error: Constructor not defined: [ApexPages.StandardController].<Constructor>(xxxxx)

I've just written a half dozen or more Test Classes using the same syntax for creating the constructor in my test method but for some reason, this one is giving me a fit.

This class is an extension class.  Is there something I need to do different? The constructors in all my classes are set up almost identically so I would assume creating them in my test class would be as well.

public with sharing class taskMyDelegatedView {
	
	public Id tskId {get;set;}	
	public Id uID {get;set;}
	public String iView {get;set;}
	
	
	private ApexPages.StandardController controller;
	public taskMyDelegatedView(ApexPages.StandardController stdController) {
      controller = stdController;
   }
	
	Id currentUserId = userinfo.getUserId();	
	   
	public List<Task> getMyDelegatedTasks() {
        return [SELECT id, Subject, Description, Status, WhatId, What.Name, Owner.Name, OwnerId, CreatedBy.Name, CreatedById, ActivityDate, Task_Due_Date__c, LastModifiedDate FROM Task WHERE CreatedById =: currentUserId ORDER BY LastModifiedDate];        
    }
    
   
   String result='Click on a task subject to preview the latest notes.';
   public String getFetchedData() {
   		return result;
   } 
   
   public PageReference invokeService() {
   		Id id = System.currentPageReference().getParameters().get('id');
   		result = [SELECT Description FROM Task WHERE Id=:id].Description;
   		return null;   	
   }
   

    public static Task testTsk;
    public static taskMyDelegatedView testTaskMDV;
    public static Task_Informed_Users__c testInformedUser;
    public static User testUserId;
        
    static testMethod void informedUserListTest() {    	
    	Test.startTest();    		
    		
	    	testUserId = [SELECT ID FROM User WHERE LastName=: 'User2'];
	    	System.Debug(testUserId);
	    	
	        testTsk = new Task(Subject='testTask', description='ABC', ownerId=testUserId.Id); 
	        insert testTsk;
	        System.Debug(testTsk.Id);	        
	       	        
	            
	        testInformedUser = new Task_Informed_Users__c(Informed_user__c=testUserId.Id, Task_ID__c=testTsk.Id, Chatter_Notification__c=FALSE, Send_Email__c=FALSE);
	        insert testInformedUser;
	        System.Debug(testInformedUser.Id);

	        
	        Test.setCurrentPage(Page.delegatedTaskView);
		ApexPages.currentPage().getParameters().put('Id',testTsk.Id);
			
		ApexPages.Standardcontroller con = new ApexPages.Standardcontroller(testTaskMDV); //ERROR HAPPENING HERE
		taskMyDelegatedView tTMDV = new taskMyDelegatedView(con);
	        
	        system.runas(testUserId) {
				

		}
        
        Test.stopTest();        
    }


}