Hi, actually i switched over to Sort Line Items on a visiualforce page on the Quote module, but i got some help from a collegue who knows a little more about apex than me. So he is the one who wrote the test class for this. 

I am posting the code here, even if i don't understand it : ) My collegue deleted all information he thought would be critical.

Maybe it gives you an idea how to write your Test Class. 

@isTest
private class TestExtensionControllerQuote {

	public static testMethod void testExtensionControllerQuote() {
		
        // testaccount
        Account testaccount = new Account (Name = 'TestAccount');
        insert testaccount;
        
        // onedate
        Date onedate = Date.valueOf('2009-04-04');
        
        // testprod
        Product2 testprod = new Product2(Name='TestProduct',Description='TestDescription');
        insert testprod;
        
        // testopportunity
        Opportunity testopportunity = new Opportunity (Name = 'TestOpp', 
        							StageName = 'Prospecting', 
        							CloseDate = onedate, 
        							AccountId = testaccount.Id);
        insert testopportunity;
        
		// pb = standart Pricebook
		Pricebook2 pb =[select name,isactive from Pricebook2 where isStandard=true];
		if(!pb.isactive){
		pb.isactive=true;
		Database.update(pb);
		}
		
		// testquote
		Quote testquote = new Quote ( Name = 'TestQuote', 
        					OpportunityId = testopportunity.Id,
        					Pricebook2Id=pb.id );
        insert testquote;
        

        
		// stage = OpportunityStage for Masterlabel
		OpportunityStage stage=[select Masterlabel from OpportunityStage where Masterlabel != '' limit 1];
		
		// opp = Opportunity
		Opportunity opp = new Opportunity();
		opp.Name='TestOpp';
		opp.AccountID=testaccount.id;
		opp.CloseDate=date.today();
		opp.StageName=stage.masterlabel;
		opp.Pricebook2Id=pb.id;
		insert opp;
		
		// p = Product
		Product2 p = new Product2();
		p.Name='TestProd';
		p.IsActive=true;
		insert p;
		
		// sumTotalPrice = double
		double sumTotalPrice = 2.0;
		
		// SumOfPhase = double
		double SumOfPhase = 0.0;
		
		//pbe = pricebook entry
		PricebookEntry pbe=new PricebookEntry();
		pbe.Pricebook2Id=pb.id;
		pbe.Product2Id=p.id;
		pbe.UnitPrice = sumTotalPrice;
		pbe.IsActive=true;
		insert pbe;
		
		
		// testlineitem = QuoteLineItem
		// test2lineitem = QuoteLineItem
		QuoteLineItem testlineitem = new QuoteLineItem();
		QuoteLineItem test2lineitem = new QuoteLineItem();
		testlineitem.QuoteId=testquote.id;
		testlineitem.PricebookEntryId=pbe.id;
		testlineitem.quantity=1;
		testlineitem.discount=0.0;  
		//testlineitem.totalprice = sumTotalPrice;
		testlineitem.UnitPrice = sumTotalPrice;
		insert testlineitem;

        // qwp = QuotePhaseWrapper
		QuotePhaseWrapper qwp=new QuotePhaseWrapper();
		qwp.quoteLineItems.add(testlineitem);
		qwp.quotePhase =testphase;

		//user
		Profile admin = [select id, name from Profile where name = 'System Administrator' OR name = 'Systemadministrator']; 
    	List<User> testusers = [select email, id, name, ProfileId from user where isActive=true and ProfileId= :admin.Id LIMIT 1];
    	system.assert ( testusers.size() == 1);

    	for (Integer i = 0; i < 1;i++){
    		System.runAs(testusers[i]) {
    			system.debug('username' + testusers[i].name);
    		}}
    	
    	// generate page
    	PageReference pageRef = Page.Quote2PDF_Page;
    	pageRef.getParameters().put('id', testquote.id); 
    	Test.setCurrentPage(pageRef);
    	
    	//System.Debug('#testquote:' + testquote); positiv
    	
    			System.Debug('#QuoteLineItems: ' + [Select 
                    o.Quantity, 
                    o.PricebookEntry.Name, 
                    o.PricebookEntryId, 
                    o.UnitPrice, 
                    o.TotalPrice
                   From QuoteLineItem o 
                   Where o.QuoteId =: ApexPages.currentpage().getParameters().get('id')
                   ORDER BY Sort_Order__c ASC limit 100
            ]);
    	
    	ApexPages.Standardcontroller controller = New ApexPages.StandardController(testquote);
    	
    	//System.Debug('#controller: ' + controller); == 'ApexPages.StandardController[Quote]'
        ExtensionControllerQuote ext = new ExtensionControllerQuote(controller); 
        ext.init();
        
        String nextPage = controller.save().getUrl();
        string testquoteid = '/' + testquote.Id;
        //nextPage = '/' + nextPage;
        
        // Verify that page fails without parameters  
        System.assertEquals( testquoteid.substring(0,16),  nextPage.substring(0,16));
//		system.debug('testquoteid.substring(0,18) ' + testquoteid.substring(0,12));
//		system.debug('nextPage' + nextPage);
		List<QuotePhaseWrapper> testextquotePhases = new List<QuotePhaseWrapper>();
    	List<QuoteLineItem> testextQuoteLineItemsSorted = new List<QuoteLineItem>();
		
		//System.currentPageReference().getParameters().put('testquote.Id', testquote.id);
	
		ext.QuotePhaseSorted.add(testphase);
		ext.QuoteLineItemsSorted.add(testlineitem);
		ext.quotePhases.add(qwp);
		
		system.assertequals(ext.QuotePhaseSorted[0].Id,testphase.Id);
		system.assertequals(ext.QuoteLineItemsSorted[0].Id,testlineitem.Id);
		//system.assertequals(ext.quotePhases[0],qwp);

	    qwp.quotePhase = testphase;
        qwp.quoteLineItems.add(testlineitem);
		system.debug(ApexPages.currentPage().getUrl());
		try {
			//system.assertEquals(qwp.quotePhase, ext.QuotePhaseSorted[0]);
			//system.assertEquals(qwp.quoteLineItems[0], ext.QuoteLineItemsSorted[0]);
			//system.assertEquals(qwp, ext.quotePhases[0]);
		}
		catch (ListException e) {
			system.debug('Test failed Alex!');
		}
		
		
		List<QuotePhaseWrapper> quotePhases  = new List<QuotePhaseWrapper> () ;
 		List<QuoteLineItem> QuoteLineItemsSorted = new List<QuoteLineItem>() ;
		Quote selectedQuote = new Quote();
		

 			
 			   QuoteLineItemsSorted = new List<QuoteLineItem>();
  	   			QuoteLineItemsSorted =
						  	   [ Select Id From QuoteLineItem Where QuoteId =: testquote.Id
						  	   ORDER BY Sort_Order__c ASC limit 100
  	   			];
  	   			
  	   List<QuotePhaseWrapper> quotePhases2  = new List<QuotePhaseWrapper> () ;

  	   for (QuotePhase__c phase : QuotePhaseSorted)
  	   {
	  	   QuotePhaseWrapper qwp2=new QuotePhaseWrapper();
	  	   qwp2.quotePhase = testphase;
	  	   for (QuoteLineItem qli : [ Select Id,
	  	  							 QuoteId, PricebookEntryId, quantity, discount, totalprice, Sort_Order__c, QuotePhase__c, UnitPrice
	  	    						From QuoteLineItem Where QuoteId =: testquote.Id])
	  	   {
		  	   system.assert(qli.QuotePhase__c == QuotePhaseSorted[0].Id);
			  	   qwp2.quoteLineItems.add(qli);
	  	   }
 	 	   quotePhases2.add(qwp2);
  	   }
  	   
  	   //system.assert( ext.QuotePhaseSorted == QuotePhaseSorted);
  	   	system.debug('ext.QuotePhaseSorted' + ext.QuotePhaseSorted.size() );
  	   	system.debug('quotePhases2' + quotePhases2 );
  	   	//system.assertequals(quotePhases2[0].quotePhase.Id,testphase.Id);
		//system.assertequals(quotePhases2[0].quoteLineItems[0].Id,testlineitem.Id);
		//system.assertequals(quotePhases[1],qwp);

    } // end testmethod
    
    
        static testMethod void TestQuotePhaseSumChangeTrigger() {
        // TO DO: implement unit test
        
        Account testaccount = new Account (Name = 'TestAccount');
        insert testaccount;
        Date onedate = Date.valueOf('2009-04-04');
        Product2 testprod = new Product2(Name='TestProduct',Description='TestDescription');

        insert testprod;
        
        Opportunity testopportunity = new Opportunity (Name = 'TestOpp', 
        							StageName = 'Prospecting', 
        							CloseDate = onedate, 
        							AccountId = testaccount.Id);
        insert testopportunity;
        
		// Get the standard pricebook
		Pricebook2 pb =[select name,isactive from Pricebook2 where isStandard=true];
		if(!pb.isactive){
		pb.isactive=true;
		Database.update(pb);
		}
		
		Quote testquote = new Quote ( Name = 'TestQuote', 
        					OpportunityId = testopportunity.Id,
        					Pricebook2Id=pb.id );
        insert testquote;
        
        QuotePhase__c testphase = new QuotePhase__c ( 
        										QuotePhaseName_Formula__c = 'Phase 00: 123456890', 
        										Quote__c = testquote.Id );
        insert testphase;
		// get valid stage name
		OpportunityStage stage=[select Masterlabel from OpportunityStage where Masterlabel != '' limit 1];
		
		// setup basic opportunity
		Opportunity opp = new Opportunity();
		opp.Name='TestOpp';
		opp.AccountID=testaccount.id;
		opp.CloseDate=date.today();
		opp.StageName=stage.masterlabel;
		opp.Pricebook2Id=pb.id;
		insert opp;
		
		// Create a product2
		Product2 p = new Product2();
		p.Name='TestProd';
		p.Produktname_lang__c ='TestDescription';
		p.IsActive=true;
		insert p;
		

		double sumTotalPrice = 2.0;
		//Create pricebook entry
		PricebookEntry pbe=new PricebookEntry();
		pbe.Pricebook2Id=pb.id;
		pbe.Product2Id=p.id;
		pbe.UnitPrice = sumTotalPrice;
		pbe.IsActive=true;
		insert pbe;
		double SumOfPhase = 0.0;
		
		system.assertEquals(testphase.Sum_of_Phases__c, null);
		
		// create opportunity line item
		QuoteLineItem testlineitem = new QuoteLineItem();
		QuoteLineItem test2lineitem = new QuoteLineItem();
		testlineitem.QuoteId=testquote.id;
		testlineitem.PricebookEntryId=pbe.id;
		testlineitem.quantity=1;
		testlineitem.discount=0.0;  
		//testlineitem.totalprice = sumTotalPrice;
		testlineitem.Sort_Order__c = 1;
		testlineitem.QuotePhase__c = testphase.Id;
		testlineitem.UnitPrice = sumTotalPrice;
		insert testlineitem;
		system.assertNotEquals(testphase.Sum_of_Phases__c, SumOfPhase);
		system.assertEquals(testlineitem.TotalPrice, testphase.Sum_of_Phases__c);
		test2lineitem = [select Id, TotalPrice, UnitPrice, quantity from QuoteLineItem where Id =: testlineitem.Id];
		system.assertEquals(testlineitem.UnitPrice, sumTotalPrice);

		// create opportunity line item
		testlineitem.quantity=2;
		update testlineitem;
		system.assertEquals(testlineitem.TotalPrice, testphase.Sum_of_Phases__c);
		test2lineitem = [select Id, TotalPrice, UnitPrice, quantity from QuoteLineItem where Id =: testlineitem.Id];
		system.assertEquals(testlineitem.quantity, test2lineitem.quantity);
		system.assertEquals(testlineitem.UnitPrice, test2lineitem.UnitPrice);
		system.assertEquals(testlineitem.quantity, test2lineitem.quantity);
		system.assertEquals(testlineitem.TotalPrice, testphase.Sum_of_Phases__c);
		delete testlineitem;
		system.assertEquals(null, testphase.Sum_of_Phases__c);
		try {
			    update testlineitem;
			} catch (system.Dmlexception e) {
			    system.assert( e.getMessage().contains('entity is deleted'));
			}

    }
    
    
    
} // end class

Good Luck!