public void TestSquare_input_is_zero()
 {
     Square s = new Square();
     int number = 0;
     int result = Square.square(number);
     int expected = 0;
     Assert.AreEqual(expected, result);
 }
 public void TestSquare_input_is_minus_5()
 {
     Square s = new Square();
     int number = -5;
     int result = Square.square(number);
     int expected = 25;
     Assert.AreEqual(expected, result);
 }