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deter danglerdeter dangler 

Mixed DML operations in test method without System.runAs() method

I am new to salesforce, so trying every example that is given there on the helo document.

The below code is from the link https://www.salesforce.com/us/developer/docs/apexcode/index_Left.htm#CSHID=apex_qs_HelloWorld.htm|StartTopic=Content%2Fapex_qs_HelloWorld.htm|SkinName=webhelp
  
@isTest
private class MixedDML {
    static testMethod void mixedDMLExample() {  
        User u;
        Account a;
        User thisUser = [SELECT Id FROM User WHERE Id = :UserInfo.getUserId()];
       // Insert account as current user
        System.runAs (thisUser) {
            Profile p = [SELECT Id FROM Profile WHERE Name='Standard User'];
            UserRole r = [SELECT Id FROM UserRole WHERE Name='COO'];
            u = new User(alias = 'jsmith', email='jsmith@acme.com', 
                emailencodingkey='UTF-8', lastname='Smith', 
                languagelocalekey='en_US', 
                localesidkey='en_US', profileid = p.Id, userroleid = r.Id,
                timezonesidkey='America/Los_Angeles', 
                username='jsmith@acme.com');
            insert u;
            a = new Account(name='Acme');
            insert a;
        }
    }
}
As per the link, this code should throw error if i remove the block System.runAs() but it is working fine.

Am I doing something wrong??

I am just running my test class in mavensmate
 
Vishnu VaishnavVishnu Vaishnav
hi Deter,

I understand that what r u trying for. Actually System.runAs() used when we need a customer portal user for test class , means that in this case u have no user and u create a temp user for noly test class.

like :
 @isTest
private class MixedDML {
    static testMethod void mixedDMLExample() { 
        //Create Account
        Account accObj = new Account(name='Test');
        insert accObj;
        
        //Create Contact
        Contact con = new contact(lastname='test',email='test@gmail.com',accountid=accObj.id);
        insert con;
        
        Profile p = [SELECT Id FROM Profile WHERE Name=''];//Profile name of customer portal
        Database.DMLOptions dmo = new Database.DMLOptions();
        dmo.EmailHeader.triggerUserEmail = false;
        User u = new User(alias = 'standt', email=con.email,
        emailencodingkey='UTF-8', lastname=con.lastname, firstname=con.firstname, languagelocalekey='en_US',
        localesidkey='en_US', profileid = p.Id, contactId=con.Id,
        timezonesidkey='America/Los_Angeles', username=con.email);
        u.setOptions(dmo);
        insert u;
        
        System.runAs(u) {
        //Some work with this test user
        } 
    }
}

In your code u are using real user so i think it will hrlpful.