test the coordinate system conversions

OpenRA.Test/OpenRA.Game/CoordinateTest.cs

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+#region Copyright & License Information
+/*
+ * Copyright 2007-2015 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation. For more information,
+ * see COPYING.
+ */
+#endregion
+
+using System;
+using System.Linq;
+using NUnit.Framework;
+
+namespace OpenRA.Test
+{
+	[TestFixture]
+	public class CoordinateTest
+	{
+		[TestCase(TestName = "Test CPos and MPos conversion and back again.")]
+		public void CoarseToMapProjection()
+		{
+			foreach (var shape in Enum.GetValues(typeof(TileShape)).Cast<TileShape>())
+			{
+				for (var x = 0; x < 12; x++)
+				{
+					for (var y = 0; y < 12; y++)
+					{
+						var cell = new CPos(x, y);
+						try
+						{
+							Assert.That(cell, Is.EqualTo(cell.ToMPos(shape).ToCPos(shape)));
+						}
+						catch (Exception e)
+						{
+							// Known problem on isometric mods that shouldn't be visible to players as these are outside the map.
+							if (shape == TileShape.Diamond && y > x)
+								continue;
+
+							Console.WriteLine("Coordinate {0} on shape {1} failed to convert back.".F(cell, shape));
+							throw e;
+						}
+					}
+				}
+			}
+		}
+	}
+}