Mocking Non Void Public Static Method

@Test
 public void testnonVoidPublicStaticMethod() throws Exception
 {
  //It Mocks the static methods of the final class Helper
  
  PowerMockito.mockStatic(Helper.class);
  
  /**
   * The Behaviour defining section
   */
    /**
     * Type 1
     * 
     * In this version the parameters could be defined with  Mockito 
     * Matchers Like anyObject(), anyInt() etc...
     * 
     * The return value can also be specified as an Answer implementation 
     * with the help of API's like PowerMockito.doAnswer
     * (<< An answer implementation >>) like answerIsArgumentString() as provided below.
     * 
     * the doCallRealMethod() returns the real Method implementation 
     * 
     */
      
  
  
    //PowerMockito.doReturn("ok").when(Helper.class, "nonVoidPublicStaticMethod", 
       anyObject(),anyObject()); 
    //PowerMockito.doCallRealMethod().when(Helper.class, "nonVoidPublicStaticMethod",
      anyObject(),anyObject());
  
  
    //PowerMockito.doAnswer(answerIsArgumentDate()).when(Helper.class, "nonVoidPublicStaticMethod",
       any(),any());
  
    
  
    /**
     * Type 2
     * 
     * In this version the parameters to be defined as original objects to be matched instead of Matchers..
     * 
     * The return value can also be specified as an Answer implementation with the help of
     * API's like thenAnswer(<< An answer implementation >>) like answerIsArgumentDate() 
     * as provided below.
     * 
     * the thenCallRealMethod() returns the real Method implementation 
     * 
     */
    
    
    /*when(Helper.nonVoidPublicStaticMethod(entity,stringBuilder)).thenCallRealMethod();
      when(Helper.nonVoidPublicStaticMethod(entity,stringBuilder)).thenReturn("ok");
     */
    
    when(Helper.nonVoidPublicStaticMethod(entity,stringBuilder)).thenAnswer(answerIsArgumentString()); 
  
  
  /**
   * End of Behaviour defined section
   * 
   */
  
  
  String ok = Helper.nonVoidPublicStaticMethod(entity,stringBuilder.append("ok Subhankar"));
  
  //System.out.println("The nonVoidPublicStaticMethod Result is:" +ok);
 }

 //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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