public void TestDistance()
        {
            Coordonnees coord1 = new Coordonnees(0, 1);
            Coordonnees coord2 = new Coordonnees(0, 1);
            Coordonnees coord3 = new Coordonnees(0, 2);

            Assert.AreEqual(0.0, coord1.distance(coord1));
            Assert.AreEqual(0.0, coord1.distance(coord2));
            Assert.AreEqual(1.0, coord1.distance(coord3));
        }