public void Rectangle_Area_CheckResult()
{
//Arrange
decimal a = 4m;
decimal b = 2m;
decimal c = 2m;
decimal expectedResult = 8m;
RectangleShape op = new RectangleShape()
{
Side1 = a, Side2 = b, Height = c
};
//Act
decimal response = op.Area();
//Assert
Assert.AreEqual(expectedResult, response);
}