Object comparisons: asserting object identity

• assertSame and assertNotSame use the == operator:

       
      public void testAIsA() {
          Fraction a = new Fraction(17, 56);
          assertSame(a, a);
      }
       
       
      public void testAIsNotA2() {
          Fraction a = new Fraction(17, 56);
          Fraction b = new Fraction(17, 56);
          assertNotSame(a, b);
      }

• Does the last test go too far? is that really part of the class's contract?