@Override protected void tearDown(){
  m_Classifier=null;
  m_OptionTester=null;
  File file=new File(MODEL_FILENAME);
  if (file.exists()) {
    file.delete();
  }
}

@ Override protected void tearDown ( ) { m_Classifier = null ; m_OptionTester = null ; File file = new File ( MODEL_FILENAME ) ; if ( file . exists ( ) ) { file . delete ( ) ; } }
called by junit after each test method
