diff -r 8b132f8de8c7 -r fd3f8581ce85 marking/knight1_test.scala
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/marking/knight1_test.scala	Thu Dec 08 12:50:54 2016 +0000
@@ -0,0 +1,19 @@
+
+import scala.concurrent._
+import scala.concurrent.duration._
+import ExecutionContext.Implicits.global
+import scala.language.postfixOps 
+
+lazy val f = Future {
+  assert(legal_moves(8, Nil, (2,2)) == 
+             List((3,4), (4,3), (4,1), (3,0), (1,0), (0,1), (0,3), (1,4)))
+  assert(legal_moves(8, Nil, (7,7)) == List((6,5), (5,6)))
+  assert(legal_moves(8, List((4,1), (1,0)), (2,2)) == 
+             List((3,4), (4,3), (3,0), (0,1), (0,3), (1,4)))
+  assert(legal_moves(8, List((6,6)), (7,7)) == List((6,5), (5,6)))
+  assert(legal_moves(1, Nil, (0,0)) == List())
+  assert(legal_moves(2, Nil, (0,0)) == List())
+  assert(legal_moves(3, Nil, (0,0)) == List((1,2), (2,1)))
+}
+
+Await.result(f, 120 second)