Committing bug fixed code to main branch

src/main/java/dotsandboxes/DotsAndBoxesGrid.java

@@ -112,10 +112,13 @@ 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 (this.horizontals[x][y] == true && this.horizontals[x][y+1] == true &&  this.verticals[x][y] == true && this.verticals[x+1][y] == true) {
             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) {
         if (boxComplete(x, y)) {
@@ -141,6 +144,10 @@ public class DotsAndBoxesGrid {
         }
 
         // FIXME: You need to throw an exception if the line was already drawn.
+        if (this.horizontals[x][y] == true) {
+            throw new IllegalStateException(String.format("IllegalStateException - This line has already been drawn"));
+            }
+
 
         this.horizontals[x][y] = true;
 
@@ -172,6 +179,9 @@ public class DotsAndBoxesGrid {
         }
 
         // You need to throw an exception if the line was already drawn.
+        if (this.verticals[x][y]) {
+                throw new IllegalStateException(String.format("This line has already been drawn"));
+        }
 
         this.verticals[x][y] = true;
         // Try to claim the north or south boxes

src/test/java/dotsandboxes/DotsAndBoxesGridTest.java

@@ -32,13 +32,13 @@ public class DotsAndBoxesGridTest {
     @Test
     public void testTestingBoxComplete() {
         logger.info("Test of box completion test");
-        logger.info("Drawing complete box, then asserting incomplete state");
+        logger.info("Drawing complete box, then asserting complete state");
         DotsAndBoxesGrid g = new DotsAndBoxesGrid(4,4,1);
         g.drawHorizontal(1,1, 1);
         g.drawHorizontal(1,2,1);
         g.drawVertical(1,1,1);
         g.drawVertical(2,1,1);
-        assertEquals(false,g.boxComplete(1,1));
+        assertEquals(true,g.boxComplete(1,1));
     }
 
     @Test