Fixed use of Zobrist hash for positional superko detection.

test/net/woodyfolsom/msproj/GameStateTest.java

@@ -0,0 +1,33 @@
+package net.woodyfolsom.msproj;
+
+import static org.junit.Assert.*;
+
+import java.util.List;
+
+import org.junit.Test;
+
+public class GameStateTest {
+
+	@Test
+	public void testGetEmptyCoords() {
+		GameState gameState = new GameState(3);
+		
+		gameState.playStone(Player.BLACK, "A1");
+		gameState.playStone(Player.WHITE, "A2");
+		gameState.playStone(Player.BLACK, "A3");
+		
+		List<String> validMoves = gameState.getEmptyCoords();
+		
+		assertFalse(validMoves.contains("A1"));
+		assertFalse(validMoves.contains("A2"));
+		assertFalse(validMoves.contains("A3"));
+		
+		assertTrue(validMoves.contains("B1"));
+		assertTrue(validMoves.contains("B2"));
+		assertTrue(validMoves.contains("B3"));
+		assertTrue(validMoves.contains("C1"));
+		assertTrue(validMoves.contains("C2"));
+		assertTrue(validMoves.contains("C3"));
+	}
+
+}