Added a test to check whether the game completes a box upon adding just one...

Added a test to check whether the game completes a box upon adding just one horizontal line. The test fails.

src/test/java/dotsandboxes/DotsAndBoxesGridTest.java

@@ -28,4 +28,14 @@ public class DotsAndBoxesGridTest {
     }
 
     // FIXME: You need to write tests for the two known bugs in the code.
+    /** this tests whether drawing just a horitonal line at coordinate (0,0)
+     * completes a box at coordinate (0,0) or not.
+     * The game shouldn't complete a box and return false. */
+    @DisplayName("Just horizontal line at [0][0], complete a box at [0][0]")
+    @Test
+    public void testBoxComplete() {
+        DotsAndBoxesGrid grid = new DotsAndBoxesGrid(4, 3, 2);
+        grid.drawHorizontal(0, 0, 1);
+        assertEquals(false, grid.boxComplete(0, 0));
+    }
 }