public void ThreePointsTest()
{
var node1 = new GraphElement(new[] { 15.0 }, "node1");
var node2 = new GraphElement(new[] { 10.0 }, "node2");
var node3 = new GraphElement(new[] { -3.0 }, "node3");
var el = new List<GraphElement> { node1, node2, node3 };
var conn1 = new Connection(0, 1);
var conn2 = new Connection(1, 2);
var conn3 = new Connection(0, 2);
var con = new List<Connection> { conn1, conn2, conn3 };
var gm = new GraphManager(con, el);
var calculator = new LinearCalculator();
calculator.Calculate(gm);
Assert.AreEqual(5, gm.Connections[0].Distance);
Assert.AreEqual(13, gm.Connections[1].Distance);
Assert.AreEqual(18, gm.Connections[2].Distance);
}