Hello,
Here i am tried to write a test class for importing csv file.THere is no code coverage.Plese help me on this.

public class adminPriorSale {
    public list<Distributor_Prior_Sales__c> accon{get;set;}
    public Distributor_Prior_Sales__c agnt{get;set;}
    public Integer PriorSale{set;get;}
    public id tobeEdited{get; set;} 
    public string deleteid{get;set;}
    public boolean editSection {get;set;}
    public ApexPages.StandardController stand;
    Public String retURL{get;set;}
    //To import file
    public Blob csvFileBody{get;set;}
    public string csvAsString{get;set;}
    public String[] csvFileLines{get;set;}
    
    public adminPriorSale(apexpages.standardcontroller controller )
   {
     
     retURL = ApexPages.currentPage().getParameters().get('retURL');
     this.stand=controller;
     tobeEdited = controller.getId();
     agnt = new Distributor_Prior_Sales__c();
     accon = New List<Distributor_Prior_Sales__c>(); 
     accon= [select id,Name,SMS_sales_amount__c,SMS_Year__c,Customer__c,Calculation_Type__c from Distributor_Prior_Sales__c]; 
     
     csvFileLines = new String[]{};
     
     }


public PageReference EdittheSection()
     {
       PageReference ref=new PageReference('/apex/adminPriorSale1?retURL=/apex/Admin');
       ref.setRedirect(true);
       update accon;
       return ref;
       }
    
   private void LoadData()
       {
           accon= [select id,Name,SMS_sales_amount__c,SMS_Year__c,Customer__c,Calculation_Type__c from Distributor_Prior_Sales__c WHERE (owner.id =: userinfo.getuserid())];
       }
        
       // Import CSV file to list of record
       
        public void importCSVFile(){
        
       try{
           csvAsString = csvFileBody.toString();
           csvFileLines = csvAsString.split('\n'); 
           for(Integer i=0;i<csvFileLines.size();i++){
               Distributor_Prior_Sales__c prisale = new Distributor_Prior_Sales__c () ;
               string[] csvRecordData = csvFileLines[i].split(',');
               prisale.SMS_Year__c= csvRecordData[0] ;             
               prisale.SMS_sales_amount__c= Decimal.valueof(csvRecordData[1]);
               prisale.Customer__c= csvRecordData[2];
               prisale.Calculation_Type__c = csvRecordData[3];   
               accon.add(prisale); 
             
           }
        upsert accon;
        
        }
        catch (Exception e)
        {
            ApexPages.Message errorMessage = new ApexPages.Message(ApexPages.severity.ERROR,e.getMessage());
            ApexPages.addMessage(errorMessage);
        } 
        
  }    
        
        
    public void save1()
        {
         update accon;
        }
     public void DeleteSale()
       {

        Distributor_Prior_Sales__c del_task=new Distributor_Prior_Sales__c(id=deleteid);
        delete del_task;
        accon=[select id,Name,SMS_sales_amount__c,SMS_Year__c,Customer__c,Calculation_Type__c from Distributor_Prior_Sales__c];
        
        }
        
        
     public pagereference saveRecord()
     {
        List<Distributor_Prior_Sales__c> discLocal=accon.clone() ;
        List<Distributor_Prior_Sales__c> discLocal2=new List<Distributor_Prior_Sales__c>(accon);
         integer i=0;
        for(Distributor_Prior_Sales__c sale:accon){
        
               if(sale.SMS_sales_amount__c==null && sale.SMS_Year__c ==null && sale.Customer__c ==null && sale.Calculation_Type__c==null  )
               { discLocal2.remove(i); }
               
               else if(sale.SMS_sales_amount__c==null || sale.SMS_Year__c ==null || sale.Customer__c ==null || sale.Calculation_Type__c==null )
               {
               ApexPages.Message msg = new ApexPages.Message(ApexPages.Severity.ERROR,'You must enter all required fields');
               ApexPages.addMessage(msg);
               return null;
              }
              i++;
           }
          upsert discLocal2; 
        PageReference pageRef = new PageReference('/apex/adminPriorSale?retURL=/apex/Admin');
        pageref.setRedirect(true);
        return pageref; 
      }
    
     public PageReference cancel()  
     {
      PageReference pg1=new PageReference('/apex/adminPriorSale?retURL=/apexAdmin');
      pg1.setRedirect(true);
      return pg1;
     }  
   public void addrow() {
            
        Distributor_Prior_Sales__c proSale = new Distributor_Prior_Sales__c();
        proSale.SMS_sales_amount__c= (agnt.SMS_sales_amount__c);
        proSale.SMS_Year__c =(agnt.SMS_Year__c );
        proSale.Customer__c=(agnt.Customer__c);
        proSale.Calculation_Type__c=(agnt.Calculation_Type__c);
        
        accon.add(proSale );
       }  
     }


And it test class is 


@isTest(seeAllData=true)
private class test_adminPriorSale {
    static testMethod void test_adminPriorSale()
    { 
        Distributor_Prior_Sales__c   t1= new Distributor_Prior_Sales__c  ();
        t1.Name='test1';
        t1.SMS_sales_amount__c =123;
        t1.SMS_Year__c='2012';
        insert t1;
        
        String csvContent = 'test1',123,'2012','I Architects','Estimated Prior sales';
        
        PageReference pageRef = Page.adminPriorSale; // Adding VF page Name here
        pageRef.getParameters().put('id', String.valueOf(t1.id));//for page reference
        Test.setCurrentPage(pageRef);
        
        ApexPages.currentPage().getParameters().put('RecordType','adminPriorSale');
        ApexPages.StandardController sc = new ApexPages.standardController(t1);
        adminPriorSale controller = new adminPriorSale(sc);
        
        controller.save1();
        controller.saveRecord();
        controller.addrow();
        controller.DeleteSale();
        controller.editSection = true;
        controller.EdittheSection();
        //controller.LoadData();
        controller.cancel();
        controller.importCSVFile();
        
    }
    static testMethod void test_adminPriorSale2()
    { 
        Distributor_Prior_Sales__c   t1= new Distributor_Prior_Sales__c  ();
        t1.Name='test1';
        //t1.SMS_sales_amount__c =123;
        //t1.SMS_Year__c='2014';
        insert t1;

        Distributor_Prior_Sales__c   t2= new Distributor_Prior_Sales__c  ();
        t2.Name='test1';
        t2.SMS_sales_amount__c =123;
        t2.SMS_Year__c='2014';
        insert t2;
        
        PageReference pageRef = Page.adminPriorSale; // Adding VF page Name here
        pageRef.getParameters().put('id', String.valueOf(t1.id));//for page reference
        pageRef.getParameters().put('retURL', String.valueOf(t1.id));//for page reference
        Test.setCurrentPage(pageRef);
        
        ApexPages.currentPage().getParameters().put('RecordType','adminPriorSale');
        ApexPages.StandardController sc = new ApexPages.standardController(t1);
        adminPriorSale controller = new adminPriorSale(sc);
        controller.saveRecord();
        controller.cancel();
    }

    static testMethod void test_adminPriorSale3()
    { 
        Distributor_Prior_Sales__c   t1= new Distributor_Prior_Sales__c  ();
        t1.Name='test1';
        //t1.SMS_sales_amount__c =123;
        //t1.SMS_Year__c='2014';
        insert t1;
        
        PageReference pageRef = Page.adminPriorSale; // Adding VF page Name here
        pageRef.getParameters().put('id', String.valueOf(t1.id));//for page reference
        Test.setCurrentPage(pageRef);
        
        ApexPages.currentPage().getParameters().put('RecordType','adminPriorSale');
        ApexPages.StandardController sc = new ApexPages.standardController(t1);
        adminPriorSale controller = new adminPriorSale(sc);
        controller.cancel();
        controller.editSection = true;
        controller.EdittheSection();
    }
    
}

It is giving 64% code coverage.not covering the importing csv file part.someone please help me on this.