title: Is there any way to Mock private method call inside another method in Junit5
body: <p>Below is the method which I wanted to test but as per my knowledge Junit5 doesn't support PowerMockito. So is there any way I can mock private method call inside another method ?</p>
  <pre><code>public Class MyClass {    
  
  
  private void sendEmailNotification(Checklist Checklist){
      EmailService emailService = new EmailService();
      BaseDTO esDO = newFolderService.getFolderByUri(ServicesUtils.getDecodedCaseNodeUriFromSelfLink(Checklist.getEs_uri()));
      String esName = esDO.getName();
      SharedInfo sharedInfo = Checklist.getShared_info();
      sharedInfo.setEng_space_name(esName);
      String reviewer = Checklist.getReviewer();
      String ChecklistUri = Checklist.getUri();
      String ChecklistName = Checklist.getName();
      String targetPhase = Checklist.getTarget_phase();
      String comment = Checklist.getComment();
      String submitter = Checklist.getSubmitter();
      String appURL = Checklist.getShared_info().getApp_url();
      String ChecklistLink = buildChecklistURL(appURL, ChecklistUri);
      String emailBodyTemplate;
      String emailSubject;
  
        emailBodyTemplate = EmailTemplates.getEmailTemplateByName(EmailConstants.TEMPLATE_DELIVERABLE_ACCEPTED_REJECTED_WITH_COMMENTS);
        emailSubject = String.format(EmailConstants.ACCEPT_REJECT_WITH_COMMENTS_SUBJECT, ChecklistName, targetPhase);
        emailBodyTemplate = EmailTemplates.replaceSharedVariable(emailBodyTemplate, sharedInfo);
        emailBodyTemplate = EmailTemplates.replaceVariable(emailBodyTemplate, EmailConstants.VAR_TARGET_PHASE, targetPhase);
        emailBodyTemplate = EmailTemplates.replaceVariable(emailBodyTemplate, EmailConstants.VAR_REVIEWER, reviewer);
        emailBodyTemplate = EmailTemplates.replaceVariable(emailBodyTemplate, EmailConstants.VAR_CHECKLIST_ITEM_NAME, ChecklistName);
        emailBodyTemplate = EmailTemplates.replaceVariable(emailBodyTemplate, EmailConstants.VAR_COMMENT, comment);
        emailBodyTemplate = EmailTemplates.replaceVariable(emailBodyTemplate, EmailConstants.VAR_CHECKLIST_ITEM_URL, ChecklistLink);
      try {
        emailService.sendEmail(submitter, EmailConstants.EMAIL_SENDER, emailSubject, emailBodyTemplate);
      } catch (RuntimeException e) {
        Checklist.addError(messages.get(E_ACCEPT_REJECT_SEND_EMAIL));
      }
  </code></pre>
  <p>}</p>
  <pre><code>//Method to be tested
  
  public void method(Checklist checklist){
  
    /*Some Code*/
  
    sendEmail(checklist);  /* want to ignore this, as throwing NullPointerException*/
  
    /*Some Code*/
  
  }}
  </code></pre>