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Difference between Apex class and Apex test class?

Hi

 

i am newbie to development

 

Difference between Apex class and Apex test class. 

 

purpose of writing testclass.

 

 

Regards.

Best Answer chosen by Admin (Salesforce Developers) 
@anilbathula@@anilbathula@

Hi

 

Apex Class:- its a piece of code which do some task in your application.

in simple if you have written a  piece of code to add two fields. and display that in another field.

 

 apex class syntax

 

Public Class add{

     your code..........

}

 

 

Apex test Class :-its also a piece of code which test the functionality of the apex class.

Ex:-to check the above apex program is performing correctly or not in runtime ,you will write test method by insert in some dummy data and checking the out put in the same class by using system assert function.

 

 apex test class syntax:-

 

@isTest

private class add {

static testMethod void add() {

          Your test code...............

   }

}

 
Check this link for writing apex class and test classes:-
http://www.salesforce.com/us/developer/docs/apexcode/Content/apex_qs_HelloWorld.htm