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      public void testAddNonEqualNumbers() {
   
          Complex z1 = new Complex(1, 1);
          Complex z2 = new Complex(2, 2);
          Complex z3 = z1.add(z2);
          assertEquals(3, z3.getRealPart(), 0);
          assertEquals(3, z3.getImaginaryPart(), 0);
    
      }    

• This test fails!

• So fix the code