public void TestAddTwoVectors() { Cartesian2DVector vector1 = new Cartesian2DVector { X = 5, Y = 10 }; Cartesian2DVector vector2 = new Cartesian2DVector { X = 3, Y = 14 }; VectorCalculator calc = new VectorCalculator(); Cartesian2DVector result = calc.Add(vector1, vector2); Assert.That(result.X, Is.EqualTo(8)); Assert.That(result.Y, Is.EqualTo(24)); }