### Question:
ActionMailValidator extends ActionBase implements Cloneable, IAction { public Result execute( Result previousResult, int nr ) { Result result = previousResult; result.setNrErrors( 1 ); result.setResult( false ); String realEmailAddress = environmentSubstitute( emailAddress ); if ( Utils.isEmpty( realEmailAddress ) ) { logError( BaseMessages.getString( PKG, "ActionMailValidator.Error.EmailEmpty" ) ); return result; } String realSender = environmentSubstitute( emailSender ); if ( smtpCheck ) { if ( Utils.isEmpty( realSender ) ) { logError( BaseMessages.getString( PKG, "ActionMailValidator.Error.EmailSenderEmpty" ) ); return result; } } String realDefaultSMTP = environmentSubstitute( defaultSMTP ); int timeOut = Const.toInt( environmentSubstitute( timeout ), 0 ); String[] mailsCheck = realEmailAddress.split( " " ); boolean exitloop = false; boolean mailIsValid = false; String MailError = null; for ( int i = 0; i < mailsCheck.length && !exitloop; i++ ) { String email = mailsCheck[ i ]; if ( log.isDetailed() ) { logDetailed( BaseMessages.getString( PKG, "ActionMailValidator.CheckingMail", email ) ); } MailValidationResult resultValidator = MailValidation.isAddressValid( log, email, realSender, realDefaultSMTP, timeOut, smtpCheck ); mailIsValid = resultValidator.isValide(); MailError = resultValidator.getErrorMessage(); if ( log.isDetailed() ) { if ( mailIsValid ) { logDetailed( BaseMessages.getString( PKG, "ActionMailValidator.MailValid", email ) ); } else { logDetailed( BaseMessages.getString( PKG, "ActionMailValidator.MailNotValid", email ) ); logDetailed( MailError ); } } if ( !resultValidator.isValide() ) { exitloop = true; } } result.setResult( mailIsValid ); if ( mailIsValid ) { result.setNrErrors( 0 ); } return result; } ActionMailValidator( String n, String scr );  ActionMailValidator(); void setSMTPCheck( boolean smtpcheck ); boolean isSMTPCheck(); String getEmailAddress(); void setEmailAddress( String emailAddress ); String getTimeOut(); void setTimeOut( String timeout ); String getDefaultSMTP(); void setDefaultSMTP( String defaultSMTP ); String geteMailSender(); void seteMailSender( String emailSender ); Object clone(); String getXml(); void loadXml( Node entrynode,
                       IHopMetadataProvider metadataProvider ); Result execute( Result previousResult, int nr ); boolean evaluates(); @Override void check( List<ICheckResult> remarks, WorkflowMeta workflowMeta, IVariables variables, IHopMetadataProvider metadataProvider );  }### Answer:
@Test public void testExecute() { HopLogStore.init(); Result previousResult = new Result(); ActionMailValidator validator = new ActionMailValidator(); Result result = validator.execute( previousResult, 0 ); assertNotNull( result ); }