added bux fixes

src/main/java/dotsandboxes/DotsAndBoxesGrid.java

@@ -111,9 +111,12 @@ public class DotsAndBoxesGrid {
         }
 
         // A box is complete if the north and south horizontals and the east and west verticals have all been drawn.
-        // FIXME: You'll need to fix this code (after writing a test first).
+
+        if (getVertical(x, y) && getVertical(x + 1, y) && getHorizontal(x, y) && getHorizontal(x, y + 1)){
             return true;
           }
+        return false;
+    }
 
     /** Tries to claim a box for a player. If the box is complete, sets the ownership and returns true. */
     private boolean claimBox(int x, int y, int p) {
@@ -140,6 +143,9 @@ public class DotsAndBoxesGrid {
         }
 
         // FIXME: You need to throw an exception if the line was already drawn.
+        if (getHorizontal(x, y)){
+            throw new IllegalStateException(String.format("Horizontal line already drawn"));
+        }
         
         this.horizontals[x][y] = true;
 
@@ -171,6 +177,9 @@ public class DotsAndBoxesGrid {
         }
 
         // You need to throw an exception if the line was already drawn.
+        if (getVertical(x, y)){
+            throw new IllegalStateException(String.format("Vertical line already drawn"));
+        }
 
         this.verticals[x][y] = true;
         // Try to claim the north or south boxes

src/test/java/dotsandboxes/DotsAndBoxesGridTest.java

@@ -35,14 +35,15 @@ public class DotsAndBoxesGridTest {
     public void testCompleteBox() {
         logger.info("Testing whether the algorithm for testing whether a box is complete is wrong");
 
-        DotsAndBoxesGrid grid = new DotsAndBoxesGrid(1, 1, 2);
+        DotsAndBoxesGrid grid = new DotsAndBoxesGrid(15, 8, 2);
         
         // draw three sides of a box, not four!
-        grid.drawVertical(0, 0, 1);
-        grid.drawVertical(1, 0, 1);
-        grid.drawHorizontal(0, 0, 1);
+        grid.drawVertical(1, 1, 1);
+        grid.drawVertical(2, 1, 1);
+        grid.drawHorizontal(1, 1, 1);
+        // grid.drawHorizontal(1, 2, 1);
 
-        assertFalse(grid.boxComplete(1, 0));
+        assertFalse(grid.boxComplete(1, 1));
     }
 
     @Test