I have nearly completed a registration handler for our community that uses person accounts, but need a little help finishing up.  Below you can see my registration handler class, along with the corresponding test.  

• Since this is for a community, do I have to specify the Salesforce License type of Customer Community Login user when creating the user?
• I tried to create a person account, then capture the ContactId to use when creating the user, does that look complete?

Also, both the class and test save, and when the test runs, it says that it covers 100% of the class code, but it fails.  I get the following error:

System.DmlException: Update failed. First exception on row 0 with id 0054C000000M2VbQAK; first error: MIXED_DML_OPERATION, DML operation on setup object is not permitted after you have updated a non-setup object (or vice versa): User, original object: Account: []
Class.FamilySearchRegHandler.updateUser: line 52, column 1
Class.FamilySearchRegHandler_Test.testCreateAndUpdateUser: line 20, column 1

I found this suggestion, but I am not quite sure how to implement it.

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

Any suggestions?
 

global class FamilySearchRegHandler implements Auth.RegistrationHandler{

global User createUser(Id portalId, Auth.UserData data){

    RecordType personAccountRecordType =  [SELECT Id FROM RecordType WHERE Name = 'Person Account' and SObjectType = 'Account'];
    Account newPersonAccount = new Account();
        // for person accounts we can not update the Name field instead we have to update the FirstName and LastName individually
        newPersonAccount.FirstName = data.firstName;
        newPersonAccount.LastName =  data.lastName;
        newPersonAccount.RecordType = personAccountRecordType;
        insert newPersonAccount;
    	
    	Contact c = [SELECT AccountId,Id FROM Contact WHERE AccountId = :newPersonAccount.Id];   
    
        //TODO: Customize the username and profile. Also check that the username doesn't already exist and
        //possibly ensure there are enough org licenses to create a user. Must be 80 characters or less.
        User u = new User();
        Profile p = [SELECT Id FROM profile WHERE name='Community - FS - Public'];
        u.username = data.username + '.fscommunity';
        u.email = data.email;
        u.lastName = data.lastName;
        u.firstName = data.firstName;
        String alias = data.username;
        //Alias must be 8 characters or less
        if(alias.length() > 8) {
            alias = alias.substring(0, 8);
        }
        u.alias = alias;
        u.languagelocalekey = UserInfo.getLocale();
        u.localesidkey = UserInfo.getLocale();
        u.emailEncodingKey = 'UTF-8';
        u.timeZoneSidKey = 'America/Denver';
        u.profileId = p.Id;
        u.contactId = c.Id;
        return u;
    } 


global void updateUser(Id userId, Id portalId, Auth.UserData data){
    User u = new User(id=userId);
    //TODO: Customize the username. Must be 80 characters or less.
    //u.username = data.username + '.fscommunity';
    u.email = data.email;
    u.lastName = data.lastName;
    u.firstName = data.firstName;
    //String alias = data.username;
    //Alias must be 8 characters or less
    //if(alias.length() > 8) {
        //alias = alias.substring(0, 8);
    //}
    //u.alias = alias;
    update(u);
}
}

 

@isTest
private class FamilySearchRegHandler_Test {
static testMethod void testCreateAndUpdateUser() {
    FamilySearchRegHandler handler = new FamilySearchRegHandler();
    Auth.UserData sampleData = new Auth.UserData('testId', 'testFirst', 'testLast',
        'testFirst testLast', 'testuser@example.org', null, 'testuserlong@fs.org', 'en_US', 'facebook',
        null, new Map<String, String>{'language' => 'en_US'});
    User u = handler.createUser(null, sampleData);
    System.assertEquals('testuserlong@fs.org.fscommunity', u.userName);
    System.assertEquals('testuser@example.org', u.email);
    System.assertEquals('testLast', u.lastName);
    System.assertEquals('testFirst', u.firstName);
    System.assertEquals('testuser', u.alias);
    insert(u);
    String uid = u.id;
    
    sampleData = new Auth.UserData('testNewId', 'testNewFirst', 'testNewLast',
        'testNewFirst testNewLast', 'testnewuser@example.org', null, 'testnewuserlong', 'en_US', 'facebook',
        null, new Map<String, String>{});
    handler.updateUser(uid, null, sampleData);
    
    User updatedUser = [SELECT userName, email, firstName, lastName, alias FROM user WHERE id=:uid];
    System.assertEquals('testnewuserlong@salesforce.com', updatedUser.userName);
    System.assertEquals('testnewuser@example.org', updatedUser.email);
    System.assertEquals('testNewLast', updatedUser.lastName);
    System.assertEquals('testNewFirst', updatedUser.firstName);
    System.assertEquals('testnewu', updatedUser.alias);
}
}