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Ashritha ReddyAshritha Reddy 

system.runas

what is system.runas() can any one explain how can we use it?
Best Answer chosen by Ashritha Reddy
Amit Chaudhary 8Amit Chaudhary 8

Problem
Generally, all Apex code runs in system mode, where the permissions and record sharing of the current user are not taken into account. The system method runAs enables you to write test methods that change the user context to an existing user or a new user so that the user’s record sharing is enforced. The runAs method doesn’t enforce user permissions or field-level permissions, only record sharing.

Solution
You can use runAs only in test methods. The original system context is started again after all runAs test methods complete
  
@isTest
private class TestRunAs {
   public static testMethod void testRunAs() {
      // Setup test data
      // This code runs as the system user
      Profile p = [SELECT Id FROM Profile WHERE Name='Standard User']; 
      User u = new User(Alias = 'standt', Email='standarduser@testorg.com', 
      EmailEncodingKey='UTF-8', LastName='Testing', LanguageLocaleKey='en_US', 
      LocaleSidKey='en_US', ProfileId = p.Id, 
      TimeZoneSidKey='America/Los_Angeles', UserName='standarduser@testorg.com');

      System.runAs(u) {
         // The following code runs as user 'u' 
         System.debug('Current User: ' + UserInfo.getUserName());
         System.debug('Current Profile: ' + UserInfo.getProfileId()); 
      }
   }
}
Other Uses of runAs

You can also use the runAs method to perform mixed DML operations in your test by enclosing the DML operations within the runAs block. In this way, you bypass the mixed DML error that is otherwise returned when inserting or updating setup objects together with other sObjects

Let us know if this will help you

Thanks
Amit Chaudhary

All Answers

hitesh90hitesh90
Hello Ashritha,

System.RunAs() is enables us to write test methods that change the user context which we have passed as a parameter. see below link:

https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_testing_tools_runas.htm

Let me know if you have any question on this.

Thank You,
Hitesh Patel
Email :- hiteshpatel.aspl@gmail.com
http://mrjavascript.blogspot.in/
Amit Chaudhary 8Amit Chaudhary 8

Problem
Generally, all Apex code runs in system mode, where the permissions and record sharing of the current user are not taken into account. The system method runAs enables you to write test methods that change the user context to an existing user or a new user so that the user’s record sharing is enforced. The runAs method doesn’t enforce user permissions or field-level permissions, only record sharing.

Solution
You can use runAs only in test methods. The original system context is started again after all runAs test methods complete
  
@isTest
private class TestRunAs {
   public static testMethod void testRunAs() {
      // Setup test data
      // This code runs as the system user
      Profile p = [SELECT Id FROM Profile WHERE Name='Standard User']; 
      User u = new User(Alias = 'standt', Email='standarduser@testorg.com', 
      EmailEncodingKey='UTF-8', LastName='Testing', LanguageLocaleKey='en_US', 
      LocaleSidKey='en_US', ProfileId = p.Id, 
      TimeZoneSidKey='America/Los_Angeles', UserName='standarduser@testorg.com');

      System.runAs(u) {
         // The following code runs as user 'u' 
         System.debug('Current User: ' + UserInfo.getUserName());
         System.debug('Current Profile: ' + UserInfo.getProfileId()); 
      }
   }
}
Other Uses of runAs

You can also use the runAs method to perform mixed DML operations in your test by enclosing the DML operations within the runAs block. In this way, you bypass the mixed DML error that is otherwise returned when inserting or updating setup objects together with other sObjects

Let us know if this will help you

Thanks
Amit Chaudhary
This was selected as the best answer
Rakesh51Rakesh51
Generally, all Apex code runs in system mode, and the permissions and record sharing of the current user are not taken into account. The system method runAs enables you to write test methods that change either the user contexts to an existing user or a new user. When running as a user, all of that user's record sharing is then enforced. You can only use runAs in a test method. The original system context is started again after all runAs test methods complete.

The following items use the permissions granted by the user specified with runAs running as a specific user:
  • Dynamic Apex
  • Methods using with sharing or without sharing
  • Shared records
The original permissions are reset after runAs completes.
The runAs method ignores user license limits. You can create new users with runAs even if your organization has no additional user licenses.