UTests pass with Pathfinder2D

PathFinding/Enums.cs

@@ -0,0 +1,19 @@
+namespace PathFinding
+{
+  public enum HaltCondition
+  {
+    /// <summary>
+    /// Do not stop until you reach the collection boundary.
+    /// </summary>
+    None,
+    /// <summary>
+    /// Halt after encountering a non-null element.
+    /// </summary>
+    AfterCollide
+  }
+}
+public enum Distance
+{
+  OneStep,
+  MultiStep
+}