Hi All,

I have a requirement where account's user updated related contact's user should be populated with the same value. I have written a trigger which will get execute and passes the accountid to batchclass and updates the contact field.
Now, when I write the batchclass and call it from Test.starttest () and Test.stoptest(), it is not executing execute method of batch class.

Below is the sample code:
Trigger accountupdate on Account(before update){
Map<Id,Account> accmap = new Map<Id,Account>();
for(Account a : trigger.new) {
if(a.userid!=null && a.parentId!=null && trigger.oldmap.get(a.id).userid != trigger.newmap.get(a.id).userid)){
accmap.put(a.id,a);
}}
database.executeBatch(new AccountUpdateBatch(accmap));
------------------------------------------
Batch Class
global class AccountUpdateBatch implements Database.Batachable<sObject>{
Map<Id, Account> acctmap = new Map<Id,Account>();
 global  AccountUpdateBatch(Map<Id,Account> accmap){
acctmap = accmap;
}
global Database.getQuerylocator start(Database.BatachableContext bc){
return Database.getquerylocator([select id,name,userid,accountid from contact where accountid in:acctmap.keyset()];

global void execute(Database.BatchableContext bc, list<contact> scope){

List<Contact> updateconlist = new List<contact>();
for(contact con:scope){
if(con.AccountId!=null)
{
if(acctmap.get(con.AccountId).userid!=null)
con.userid = acctmap.get(con.accountid).userid;
updateconlist.add(con);
} 
}
}
update updateconlist;

-----------------
Test class:
@isTest
public class TestAccountBatch{
@isTest
public static void testbatch(){
user uid = new user(lastname ='Test user');
insert u;
Account parentacc = new Account(name = 'Parent account',recordtypeid='xxxx');
insert parentacc;
List<Account> acclist = new List<Account>();
Map<ID, ACcount> acckeymap = new Map<ID,Account>();
for(Integer i=0;i<200;i++)
Account acc= new Account();
acc.name='Test'+i;
acc.recordtypeid ='XXXX';
acc.parentid=parentacc.id;
acclist.add(acc);
acckeymap.put(acc.id,acc);

}
insert acclist;

List<Account> updateuser = new List<Account>();
Map<Id,Account> updatedacctidmap = new Map<Id,Account>();
updateuser =[select id,userid from account where id in:acckeymap.keyset()];
for(Account acc:updateuser ){
 acc.userid = u.id;
updatedacctidmap.put(acc.id,acc);
}
update updateuser;
Test.starttest();
    AccountUpdateBatch obj = new AccountUpdateBatch(updatedacctidmap)
database.executeBatch(obj);
Test.stoptest();

}
}
The test class is only covering 31% code coverage. The code highlighted in bold is not covering. Appreciate it if anyone can help me to write the test class. Thanks!