public void Should_not_be_equal_when_coordinates_differs(int otherX, int otherY)
        {
            var a = new Coordinate(10, 10);
            var b = new Coordinate(otherX, otherY);

            Assert.That(a.Equals(b), Is.False);
        }
        public void Should_be_equal_when_x_and_y_coordinates_match()
        {
            var a = new Coordinate(10, 10);
            var b = new Coordinate(10, 10);

            Assert.That(a.Equals(b));
        }