Really Is not possible to delete User or any other option.?

Question

I have created a community where any public user can self register.

As a developer, I'm developing a different functionality for Self registration Page.

Now I've to test self Registration functionality. Salesforce not allow to create a user with duplicate email. and we are not able to delete the user. So here How can i fully test this functionality.

I have already created 15-20 User until with different email.Now how can I move forward to test this?

Answer 1

Create user inside test class and check for functionality

 @isTest
private class YourTestClass {

      private static Integer genRandomNumber() {
        return Crypto.getRandomInteger();
      }
      private  User genPersonAccountUser() {
            User testUser = new User();
            testUser.Username = 'Name+' + genRandomNumber() + '@example.com';
            testUser.Lastname = 'LastName';
            testUser.Firstname = 'FirstName';
            testUser.Alias = ('ABCD' + genRandomNumber()).left(8);
            testUser.email = 'Name+' + genRandomNumber() + '@example.com';
            insert testUser;
            return testUser;
      }
     @isTest(SeeAllData=False)
     private static void testForUser() {
         List<user> users=new List<user>();
         for(int i=0;i<10;i++)
           users.add(genPersonAccountUser);
          //Test Functionality using users 
      }       
}

In Org you can create user with same Email address but not Same username