Hello All,

I've been having trouble trying to write a test method for this class... I'm not sure if it's because I'm using querystring parameters or what, but any help would be appreciated.

public with sharing class msaOppExtension {
  public String locToSet {get;set;}
  public String statusToSet {get;set;}
  public Opportunity o;
  
  public msaOppExtension(ApexPages.StandardController ctr) {
    o = [SELECT MSA_Location__c, MSA_Location_Date__c, MSA_Returned__c, MSA_PO__c, MSA_Deposit__c FROM Opportunity WHERE Id=:ctr.getRecord().Id];
  }
   
  public PageReference updateLoc() {
    
    o.MSA_Location__c = locToSet;
    o.MSA_Location_Date__c=System.Now();
    string f = ApexPages.currentPage().getParameters().get('from');
    if (f =='Releases' && locToSet=='Releases'){
    	o.MSA_Returned__c=true;
    }
    else {
    	o.MSA_Returned__c=false;
    }
    update o;
    return null;
  }
  
  public PageReference updateStatus() {
    o.MSA_Status__c = statusToSet;
    update o;
    return null;
  }
  
  public PageReference updateCancel() {
    o.MSA_Location__c = 'Archive';
    o.MSA_Location_Date__c=System.Now();
    o.StageName='Closed Lost';
    o.Reason__c='Duplicate';
    o.Lost_To_Competitor__c='Other';
    update o;
return null;
  }
  
  public PageReference createNew(){
  		string oppId=ApexPages.currentPage().getParameters().get('id');
  		
	  	o.MSA_Location__c = 'Processing';
	    o.MSA_Location_Date__c=System.Now();
	    o.MSA_PO__c='Not Started';
	    o.MSA_Deposit__c='Not Started';
	    update o;
  	
    	List<MSA__c> rows = new List<MSA__c>();
  		rows.add(new MSA__c(Opportunity__c=oppId, RecordTypeId='01270000000UJ4M'));//Invoice

		insert rows;
		
		String newPageUrl = '/apex/MSA_Processing?l=Processing&ddl=VA';
  		PageReference newPage = new PageReference(newPageUrl);
  		newPage.setRedirect(true);
  		return newPage;
    }
    }
}