public void TestComplex()
{
var complex = new ComplexShape();
complex.Add(new Rectangle());
complex.Add(new Rectangle());
complex.Add(new Rectangle());
complex.Add(new Rectangle());
double expectedArea = 4.0;
double actualArea = complex.Area();
Assert.AreEqual(expectedArea, actualArea);
double expectedPerimeter = 16.0;
double actualPerimeter = complex.Perimeter();
Assert.AreEqual(expectedPerimeter, actualPerimeter);
}