Add castle tests

src/main/scala/model/Role.scala

@@ -47,6 +47,5 @@ case object Pawn extends Role {
 
 object Role {
 
-  val all = List(King, Queen, Rook, Bishop, Knight, Pawn)
-
+  lazy val all = List(King, Queen, Rook, Bishop, Knight, Pawn)
 }

src/test/scala/model/CastleTest.scala

@@ -0,0 +1,45 @@
+package lila
+package model
+
+import Pos._
+
+class CastleTest extends LilaSpec {
+
+  "a king" should {
+
+    val king = White - King
+
+    "castle" in {
+      "king side" in {
+        "impossible" in {
+          "pieces in the way" in {
+            Board().movesFrom(E1) must bePoss()
+          }
+        }
+        "possible" in {
+          val board = """
+PPPPPPPP
+R  QK  R"""
+          "viable moves" in {
+            board movesFrom E1 must bePoss(F1, G1)
+          }
+        }
+      }
+      "queen side" in {
+        "impossible" in {
+          "pieces in the way" in {
+            Board() movesFrom E1 must bePoss()
+          }
+        }
+        "possible" in {
+          val board = """
+PPPPPP
+R   KB"""
+          "viable moves" in {
+            board movesFrom E1 must bePoss(D1, C1)
+          }
+        }
+      }
+    }
+  }
+}

src/test/scala/model/KingTest.scala

@@ -21,6 +21,12 @@ class KingTest extends LilaSpec {
       moves(H8) must bePoss(H7, G7, G8)
     }
 
+    "move behind pawn barrier" in {
+      """
+PPPPPPPP
+R  QK NR""" movesFrom(E1) must bePoss(F1)
+    }
+
     "not move to positions that are occupied by the same colour" in {
       val board = """
 k B