如何从另一个java类中找到TestNG类中有多少个测试用例

I have two class

我有两节课

public class xyzTest {
@Test
public void TestP1TUNG557(){
    TestHelper.excuteTestcase(TUNG557);
    Assert.assertTrue(TestHelper.TestResult);
}
@Test
public void TestP1TUNG559(){
    TestHelper.excuteTestcase(TUNG559);
    Assert.assertTrue(TestHelper.TestResult);
}
@Test
public void TestP0TUNG558(){
    TestHelper.excuteTestcase(TUNG558);
    Assert.assertTrue(TestHelper.TestResult);
}
}

public class TestHelper {
 public excuteTestcase(String abc)
{
  process(abc)
}
int TotalTescase(String pattern, Class testNGclass)
 {
   How to write here..? plz help
 }
}
public class xyzTest