public class AssignPackageLicense {
public static boolean flag=true;
static String PACKAGE_NAMESPACE_PREFIX = System.Label.PACKAGE_NAMESPACE_PREFIX;
public static String exceptionText {get; set;}

public AssignPackageLicense() {
    exceptionText = 'Initialized';
}

static List<User> getUsersWithProfile(list<user> usr) {
    List<User> matchingUsers = new List<User>();
    list <id>userIds=new list<id>();
    for(user u:usr) {
        userIds.add(u.id);
    }
    matchingUsers = [SELECT Id FROM User where id in:userIds ];
    return matchingUsers;
}

public static void assignLicenseByProfile(List<user> usr) {
    //find the PackageLicense Id
    List<PackageLicense> pl = new list<PackageLicense>();
    pl=[SELECT Id, NamespacePrefix, AllowedLicenses, UsedLicenses,
        ExpirationDate,Status FROM PackageLicense WHERE
        NamespacePrefix = :PACKAGE_NAMESPACE_PREFIX];
    System.debug('pl>>>'+pl);
    if(pl.size()>0){
        System.assert(pl != null, 'PackageLicense cannot be null.');
        List<User> usersToAssignLicenses = getUsersWithProfile(usr);
        List<UserPackageLicense> firstUPLs = new List<UserPackageLicense>();

        //create a new UserPackageLicense record for each user with the specified profile
        for (Integer i = 0; i< usersToAssignLicenses.size(); i++){
            UserPackageLicense upl = new UserPackageLicense();
            upl.PackageLicenseId = pl[0].Id;
            upl.UserId = usersToAssignLicenses[i].Id;
            firstUPLs.add(upl);
        }
        System.debug('firstUPLs>>>'+firstUPLs);
        try {
            //bulk insert
            insert(firstUPLs);
        } catch(DmlException e) {
            for (Integer i = 0; i < e.getNumDml(); i++) {
                // process exception here
                System.debug(e.getDmlMessage(i));
                String status = e.getDmlStatusCode(i);
                System.debug(status + ' ' + e.getDmlMessage(i));
                if(status.equals('LICENSE_LIMIT_EXCEEDED')){
                    exceptionText = 'You tried to assign more licenses than available. ' +' You tried to create '+ firstUPLs.size()+' licenses but only have '+ (pl[0].AllowedLicenses - pl[0].UsedLicenses) + ' licenses free.';
                }
            }
        }
    }
}

@istest

Profile profileId = [SELECT Id,Name FROM Profile WHERE Name = :profileName LIMIT 1];

    User testUser = new User(LastName = 'User',
                             FirstName='Test',
                             Alias = 'Utest',
                             Email = 'user.test@TestTelstra.com',
                             Username = userName,
                             ProfileId = profileId.id,
                             TimeZoneSidKey = 'GMT',
                             LanguageLocaleKey = 'en_US',
                             EmailEncodingKey = 'UTF-8',
                             LocaleSidKey = 'en_US'
                            );
    insert testUser;
    System.debug('testUser>>>>'+testUser);
}
 static testMethod void userTest(){
     List<user> uList=new List<user>([select id,username from user where username='testuserLicense@testOrg.com' limit 1]);

   // AssignPackageLicense.assignLicenseByProfile(uList);
     //system.debug('u>>>>'+u);
     system.assertEquals('testuserlicense@testorg.com',uList[0].username);
     List<UserPackageLicense>u=new list<UserPackageLicense>([select userid from UserPackageLicense]);

 }
static testMethod void userTestcat(){
    try{
    List<user> uList=new List<user>([select id,username from user where username='testuserL3icense@testOrg.com' limit 1]);
    AssignPackageLicense.assignLicenseByProfile(uList);
    }
    catch(DMLException e) {
        //system.assertEquals(e.getMessage().contains('assign more'));
    }


 }