Running tests in parallel with testng

Test.java

  /**
   * Running tests in parallel with testng. 
  **/
 
  //Generate tests to be run in parallel 
  //Important! see paralell=true
  @DataProvider(name = "dataProvider", parallel = true)
  public Object[][] generateTets() throws Exception {
    
    //define number of threads to be used, default is 10
    System.setProperty("dataproviderthreadcount", "20");
    return TestGenerator.generateTests();
  }
 
  /**
   * Note : we are using testNg dataProvider annotation to run parametrised tests
   */
  @Test(dataProvider = "dataProvider")
  public void test() {
   ...... 
  }