diff --git a/src/test/java/puzzles/starbattle/rules/SurroundStarDirectRuleTest.java b/src/test/java/puzzles/starbattle/rules/SurroundStarDirectRuleTest.java
index ae7621b31..f6894d6de 100644
--- a/src/test/java/puzzles/starbattle/rules/SurroundStarDirectRuleTest.java
+++ b/src/test/java/puzzles/starbattle/rules/SurroundStarDirectRuleTest.java
@@ -53,6 +53,33 @@ public void SurroundStarDirectRule_CenterStarOneTile() throws InvalidFileFormatE
         }
     }
 
+    @Test
+    public void SurroundStarDirectRule_CenterStarOneTileDiagonal() throws InvalidFileFormatException {
+        TestUtilities.importTestBoard("puzzles/starbattle/rules/SurroundStarDirectRule/CenterStar", starbattle);
+        TreeNode rootNode = starbattle.getTree().getRootNode();
+        TreeTransition transition = rootNode.getChildren().get(0);
+        transition.setRule(RULE);
+
+        StarBattleBoard board = (StarBattleBoard) transition.getBoard();
+        StarBattleCell cell = board.getCell(0,0);
+        cell.setData(StarBattleCellType.BLACK.value);
+        board.addModifiedData(cell);
+
+        Assert.assertNull(RULE.checkRule(transition));
+
+        Point location = new Point(0, 0);
+        for (int i = 0; i < board.getHeight(); i++) {
+            for (int k = 0; k < board.getWidth(); k++) {
+                Point point = new Point(k, i);
+                if (point.equals(location)) {
+                    Assert.assertNull(RULE.checkRuleAt(transition, board.getCell(k, i)));
+                } else {
+                    Assert.assertNotNull(RULE.checkRuleAt(transition, board.getCell(k, i)));
+                }
+            }
+        }
+    }
+
     @Test
     public void SurroundStarDirectRule_CenterStarAllTiles()
         throws InvalidFileFormatException {
@@ -136,7 +163,7 @@ public void SurroundStarDirectRule_FalseContradiction()
         board.addModifiedData(cell);
 
         Assert.assertNotNull(RULE.checkRule(transition));
-        
+
         for (int i = 0; i < board.getHeight(); i++) {
             for (int k = 0; k < board.getWidth(); k++) {
                 Assert.assertNotNull(RULE.checkRuleAt(transition, board.getCell(k, i)));