public void CalculateArea_withSquare_ShouldReturn25()
 {
     //arrange
     var square = new Squere{ Width = 5};
     //act
     var result = AreaCalculator.CalculateArea(square);
     //assert
     Assert.AreEqual(25, result);
 }
 public void CalculateArea_withRectangle_ShouldReturn25()
 {
     //arrange
     Rectangle newRectangle = new Squere();
     newRectangle.Width = 10;
     newRectangle.Height  = 8;
     //act
     var result = AreaCalculator.CalculateArea(newRectangle);
     //assert
     Assert.AreEqual(80, result);
 }