public void GetCellLocation_of_rowF_and_column12() { //Arrange var triangle = new TriangleService(); List <Coordinate> coordinates = new List <Coordinate> { new Coordinate { X = 50, Y = 50 }, new Coordinate { X = 60, Y = 50 }, new Coordinate { X = 60, Y = 60 }, }; //Act var result = triangle.GetTriangleLocation(coordinates); //Assert Assert.AreEqual(result.Row, 'F'); Assert.AreEqual(result.Column, 12); }