Question

How do I test parameters inside a method itself. For example

class TestClass {

public void paraMethod(String para1, String para2) {
         String testPara1 = para1;
         String testPara2 = para2; 
}
}

class TestingClass {

   @Test
   public void testParaMethod () throws Exception {
             String myPara1 = "MyPara1"; 
             String myPara2 = "MyPara2";

             new TestClass().paraMethod(myPara1, myPara2);

   }
}

Ok, so is it possible to test if the testPara1 and testPara2 are properly set to the values that I have passed?

Thanks.

Answer 1

It is neither possible nor desirable to test the values and state changes of local variables of a method. They are private details of the implementation, not something you are expected to test.

Instead, your tests should judge the correctness of a method by observing something visible from the outside, such as return values, interactions with mocked environment, or externally visible changes of the object’s state.