We have a migration and below is the class  causing issue because of code coverage  . I have attached the test class to.

Help really  appreciated as its very urgent  

 global class Migrate_Account_Class_Batch implements Schedulable

{ 
  global void execute(SchedulableContext sc)
  { 
     // query to get the lastupdate date from the Custom Settings - MigrationDate
     
     MigrationDate__c MigDt =[SELECT Id,LastUpdateDate__c FROM MigrationDate__c where Name like 'Account%' order by LastUpdateDate__c desc Limit 1];
     
     if(MigDt <> null)
     {
         DateTime Dt = MigDt.LastUpdateDate__c;
         List<Account> accounts = [Select Id ,EMC_Match__c, DUNS_Match__c from Account where LastModifiedDate > :Dt AND (EMC_Match__c = true OR DUNS_Match__c = true)];
    
         //inset a new entry in the Custom Setting - MigrationDate
         MigrationDate__c mg = new MigrationDate__c(Name='Account'+ System.now(),LastUpdateDate__c=System.Today());
         insert mg;  
        
        // Define connection id 
        Id networkId = ConnectionHelper.getConnectionId('Hartford Life GBD'); 
        
        //  System.debug('After networkId');
         
        Set<Id> localAccountSet = new Set<Id>(); 
        List<Account> localAccounts = new List<Account>();
        
        // only share records created in this org, do not add accounts received from another org. 
        for (Account newAccounts : accounts )
         {
          System.Debug('EMC: ' + newAccounts.EMC_Match__c + ', Duns:' + newAccounts.DUNS_Match__c ); 
           if  (newAccounts.Id != null && (newAccounts.EMC_Match__c == true || newAccounts.DUNS_Match__c == true )) 
             
            { 
                localAccountSet.add(newAccounts.Id);
                //  System.Debug('Size: '+localAccountSet.size()+', Id:' + newAccounts.Id); 
                localAccounts.add(newAccounts); 
              }     
            }
                if (localAccountSet.size() > 0)
                { 
                //    System.debug('Before Partner Network');   
                List<PartnerNetworkRecordConnection> accountConnections =  new  List<PartnerNetworkRecordConnection>(); 
                
                for (Account newAccount : localAccounts) { 
                  if (localAccountSet.contains(newAccount.Id)) 
                  { 
                       PartnerNetworkRecordConnection newConnection = 
                          new PartnerNetworkRecordConnection( 
                              ConnectionId = networkId, 
                              LocalRecordId = newAccount.Id, 
                              SendClosedTasks = false, 
                              SendOpenTasks = false, 
                              SendEmails = false,
                              RelatedRecords = 'Location_Assignment__c'); 
                              accountConnections.add(newConnection); 
                             //  System.Debug('Network Id: '+networkId+', Account Id:' + newAccount.Id+', Related:' + newConnection.RelatedRecords); 
                    } 
                } 
                if (accountConnections.size() > 0 ) 
                { 
                       database.insert(accountConnections); 
                       System.debug('After Database commit');
                     
                      //    Migrate_LocAssign_Class_Batch LocAssign = new Migrate_LocAssign_Class_Batch(); 
                      //    LocAssign.setPCLocAssign();
                }
        } 
        
    }  
 }
}