Hi, 
 
 I wrote below test class for helper class but it is not covering not sure what is the issue when i run the test class its just run in fractions of seconds. 
 

@isTest(seealldata=true)
public class CaseTriggerUtilsTest {

    static void CreateTestData()
    {
      test.StartTest();
 
      Case cse = new Case(Status='New',Case_Category__c='Analytics',Subject='Testing for email',Origin='Email');
      
      insert cse;
      
       test.StopTest();  
     }
     
}

  

public class CaseTriggerUtils {

    private static Set<String> keyWords = new Set<String>{'FW:', 'RE:', 'RW:'};
    private static String CASEORIGIN = 'Email';
    private static integer SUBJLEN = 18;

    public static void processInsert(list<Case> cseLst) {
        String subject;
        Map<String, List<Case>> caseMap = new Map<String, List<Case>>();

        // build map for case orgin from email and subject more than 18 characters        
        for (Case c : cseLst) {
            if ((c.subject <> null) && (c.Origin == CASEORIGIN) && (c.subject.length() >= SUBJLEN) ) {
                subject = c.Subject;
                for(String keyWord : keyWords) {
                    if(subject.startsWith(keyWord)) {
                        subject = subject.replaceFirst(keyWord,'').trim();
                    }
                }
                system.debug('Subject : '  + subject);

                List<Case> cases = new List<Case>();
                if(caseMap.containsKey(subject)) {
                    cases = caseMap.get(Subject);
                }
                cases.add(c);
                caseMap.put(subject, cases);
            }
        }
        
        // loop through subject - case map to get match case owner
        for (String subj: caseMap.keySet()) {
        
            list<case> cseQry = [select id, casenumber,subject,createddate,ownerid,owner.name  from case where CreatedDate = LAST_N_DAYS:10 and subject like :('%' + subj + '%') order by createddate desc limit 1];   
                                                                                         
            for(Case cs: cseQry){
                 system.debug('Case Number :' + cs.casenumber + 'Case Subject : ' + cs.subject);
                 for(Case locCase : caseMap.get(subj)) {
                      if(locCase.Duplicate_With__c == null) {
                           locCase.Duplicate_Case__c = cs.id;
                           locCase.Duplicate_With__c = cs.id;
                           locCase.ownerid = cs.ownerId;
                           System.debug('___KKK__' + locCase);
                      }
                 }
            }
        }        
    }
}

Please suggest me

Thanks
GMASJ