Mocking Non Void Public Method

@Test
 public void testnonVoidPublicMethod() throws Exception
 {
  
  
  Helper helper = PowerMockito.mock(Helper.class);
  
   //PowerMockito.mockStatic(Helper.class);
  //ArgumentCaptor captor = ArgumentCaptor.forClass(StringBuilder.class);

  /**
   * Mocking the result of Public Non Void Instance method
   * Returning Result as an Answer implementation
   * 
   */
  
  //PowerMockito.doAnswer(answerIsArgumentString()).when(helper,"nonVoidPublicMethod",
    entity,stringBuilder);
   
  /**
   * Making the mocked behaviour of the method to throw an Exception
   * 
   */
  
  PowerMockito.doThrow(new RuntimeException(" Mocked Exception ")).when(helper
,"nonVoidPublicMethod",entity,stringBuilder);
  
  String ok= helper.nonVoidPublicMethod(entity,stringBuilder.append("ok Subhankar"));
  
  
  /**
   * We  can keep Assert statements Here
   * 
   */
  
  
  /**
   * End of Assert Statements
   */
  
 }

 
 //This method returns the toString() version of the second argument of the method invoked
 
 private static Answer answerIsArgumentString() { 
    return new Answer() {
      public String answer(InvocationOnMock invocation) {
         String str = (invocation.getArguments()[1].toString());
         return str;
      }
    };
  }
 
 
 //This method returns the toString() version of the first argument of the method invoked
 
 private static Answer answerIsArgumentDate() { 
    return new Answer() {
      public String answer(InvocationOnMock invocation) {
         String str = (invocation.getArguments()[0]).toString();
         return str;
      }
    };
  }
 

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