System.DmlException: Insert failed. First exception on row 0; first error: DUPLICATE_VALUE, An active or archived group with this name already exists or is being deleted. Choose a different name or try again in a few minutes.: [Name]
Stack Trace: Class.SandboxRefreshScript.runApexClass: line 37, column 1 Class.System.Test.testSandboxPostCopyScript: line 85, column 1 Class.TestSandboxRefreshScript.testMySandboxPrep: line 9, column 1

global class SandboxRefreshScript implements SandboxPostCopy {
global void runApexClass(SandboxContext context) {
    // Change value of Alias below to the Alias of user who should own the group
    // ensuring that it is unique among your users
    List<User> groupOwner = [SELECT Id, Username FROM User WHERE Alias = 'MKolo'];
    Id grpOwnerId = groupOwner[0].Id;

    // Create a Chatter Group for Payment Pipeline Changes
    List<CollaborationGroup> groups = new List<CollaborationGroup>();

    CollaborationGroup pipeline = new CollaborationGroup(
        CollaborationType = 'Public',
        Description = 'Group for showing changes to the cashflow pipeline. ',
        Name = 'Payment Pipeline Changes',
        OwnerId = grpOwnerId
    );
    groups.add(pipeline);

    //Create another Chatter Group for All Spark
    CollaborationGroup allSpark = new CollaborationGroup(
        CollaborationType = 'Public',
        Description = 'All Spark group. ',
        Name = 'All Spark',
        OwnerId = grpOwnerId
    );
    groups.add(allSpark);

    //Create another Chatter Group for Hiring Notifications
    CollaborationGroup hiringNotifications = new CollaborationGroup(
        CollaborationType = 'Private',
        Description = 'Hiring Notifications group. ',
        Name = 'Hiring Notifications',
        OwnerId = grpOwnerId
    );
    groups.add(hiringNotifications);

    insert groups;


    //Create a Task for yesterday (so it's immediately overdue) that
    //reminds to update Process Builders to use the new Chatter Groups.
    Task newTask = new Task(
        Subject = 'Fix Process Builders',
        ActivityDate = Date.today()-1,
        OwnerId = grpOwnerId
    );
    insert newTask;

    StarWarsTestDataUtil.createJediStudents();
    StarWarsTestDataUtil.createCampaignHierarchy();
    StarWarsTestDataUtil.createNextYrCampaignHierarchy();
    StarWarsTestDataUtil.createStarWarsCompaniesWithMentors();
    StarWarsTestDataUtil.createStarWarsRecruitCamp();
    StarWarsTestDataUtil.createStarWarsPrograms();
    StarWarsTestDataUtil.putMentorsOnCampaign();
    StarWarsTestDataUtil.putStudentsOnCampaign();
    StarWarsTestDataUtil.putProgramOnCatEnts();
    StarWarsTestDataUtil.putMentorships();

}

@isTest

@isTest
static void testMySandboxPrep() {

    Test.startTest();

    Test.testSandboxPostCopyScript(
        new SandboxRefreshScript(), UserInfo.getOrganizationId(),
        UserInfo.getOrganizationId(), UserInfo.getOrganizationName());

    Test.stopTest();

    // Test for Payment Pipeline Changes
    List<CollaborationGroup> chGroup = [SELECT Id, CollaborationType from CollaborationGroup WHERE Name = 'Payment Pipeline Changes'];
    System.assertEquals(1, chGroup.size(), 'Chatter Group List size not equal to 1');
    System.assertEquals('Public', chGroup[0].CollaborationType, 'Chatter group is not public');

    // Test for All Spark
    List<CollaborationGroup> chGroup2 = [SELECT Id, CollaborationType from CollaborationGroup WHERE Name = 'All Spark'];
    System.assertEquals(1, chGroup2.size(), 'Chatter Group List size not equal to 1');
    System.assertEquals('Public', chGroup2[0].CollaborationType, 'Chatter group is not public');

    // Test for Hiring Notifications
    List<CollaborationGroup> chGroup3 = [SELECT Id, CollaborationType from CollaborationGroup WHERE Name = 'Hiring Notifications'];
    System.assertEquals(1, chGroup3.size(), 'Chatter Group List size not equal to 1');
    System.assertEquals('Private', chGroup3[0].CollaborationType, 'Chatter group is not private');

    //Test for Task Insert
    List<Task> tasks = [SELECT Id, ActivityDate, Subject from Task WHERE Subject = 'Fix Process Builders'];
    System.assertEquals(1, tasks.size(), 'Task Group List size not equal to 1');

    //Tests for StarWarsTestDataUtil are below
    //test createJediStudents
    list<Account> schools = [SELECT Id, School_District__c from Account WHERE RecordType.Name = 'Partner School'];
    system.assert(schools.size() == 1);
    system.assert(schools[0].School_District__c != null);
    list<Contact> students = [SELECT Id from Contact WHERE RecordType.Name = 'Spark Student'];
    system.assert(students.size() == 4);
    list<Contact> parents = [SELECT Id from Contact WHERE RecordType.Name = 'Student Family Member'];
    system.assert(parents.size() == 4);

    //test that all campaigns were created (this year hierarchy =4, next year =4, student recruit, mentor recruit)
    list<Campaign> campsNow = [SELECT Id, Name from Campaign];
    system.assert(campsNow.size() == 10);

    //test createStarWarsCompaniesWithMentors();
    list<Account> allaccts = [SELECT Id, Name FROM Account WHERE RecordType.Name = 'Corporate'];
    system.assert(allaccts.size() == 2);
    list<Contact> mentContacts = [SELECT Id FROM Contact WHERE RecordType.Name = 'Individual'];
    system.assert(mentContacts.size() == 4);

    //test createStarWarsPrograms();
    list<yat__Program__c> progs = [SELECT Id, Name from yat__Program__c WHERE Name LIKE '%Jedi Middle School%'];
    system.assert(progs.size() == 3);
    list<yat__Program__c> progswith = [SELECT Id, Name from yat__Program__c WHERE Name LIKE '%Withdrawn%'];
    system.assert(progswith.size() == 2);

    //test contacts on campaigns
    Campaign mentcamp = [SELECT Id, NumberOfContacts FROM Campaign WHERE Name LIKE '%Star Wars (test data) Mentor Recruitment Spring SY%'];
    system.assert(mentcamp.NumberOfContacts == 4);
    Campaign stucamp = [SELECT Id, NumberOfContacts FROM Campaign WHERE Name LIKE '%Star Wars (test data) Student Recruitment SY%'];
    system.assert(stucamp.NumberOfContacts == 4);


    //test putProgramOnCatEnts();
    list<Catalog_Entry__c> catEnts = [SELECT Id, Assigned_Program__c from Catalog_Entry__c];
    system.assert(catEnts[0].Assigned_Program__c != null);

    //test putMentorships();
    list<Apprenticeship__c> ments = [SELECT Id, Student_Name__c from Apprenticeship__c];
    system.assert(ments[0].Student_Name__c != null);
    system.assert(ments.size() == 4);

}