Hi i have written a batch class for integration for that i have created the class in batchable class like this 
public class AccountsInsertBatch implements Database.Batchable<Account>,Database.AllowsCallouts{  
     public class accountt
         {
         public string entity_id;
         public string website_id;
         public string email;
         public string group_id;
         public string created_at;
         public string disable_auto_group_change;
         public string firstname;
         public string middlename;
         public string gender;
         public string Telephone;
         public string lastname;
         public string created_in;
         public string suffix;
         public string taxvat;
         public string ShippingAddress;  
         public string dob;      
         }
          public Iterable<Account> start(database.batchablecontext bc) {
 //Logic
     }
public void execute(database.BatchableContext BC, List<Account>accountquery){  
 //Logic
}
public void finish(Database.BatchableContext BC){ 
}
Am not getting the test coverage for the class which i have created in the Batch class.How to cover this class code covwerage?
my test class is
@isTest
public class AccountsInsertBatchTest implements HttpCalloutMock  {    
  public HTTPResponse respond(HTTPRequest req)
    { 
       HttpResponse res = new HttpResponse();
       res.setBody('{"4":{"entity_id":"4","website_id":"1","email":"ed@krishna.com","group_id":"1","created_at":"2013-09-17 14:17:12","disable_auto_group_change":"0","created_in":"Default Store View","prefix":null,"firstname":"test","middlename":null,"lastname":"Sea","suffix":"Mr.","taxvat":"123","dob":"2014-11-03 00:00:00","gender":"1"}}');
       res.setStatusCode(200);
       return res;   
    }
    @isTest static void testAccountInsert(){
        Test.StartTest();
        Test.setMock(HttpCalloutMock.class, new MockHttpResponseGenerator());
        MagentAccountsInsertBatch instance = new MagentAccountsInsertBatch ();
        database.executebatch(instance);        
        Test.StopTest();
        }
     @isTest static void testAccountInsert1(){
     Test.StartTest();
        insert new Account(LastName='krishna',personemail='ed@krishna.com',Entity_Id__c='1656');
        Test.setMock(HttpCalloutMock.class, new MockHttpResponseGenerator());
        MagentAccountsInsertBatch instance1 = new MagentAccountsInsertBatch ();
        database.executebatch(instance1); 
         Test.StopTest();    
}
}