Added unit tests to perform checks on known bugs, These tests currently fail

src/test/java/dotsandboxes/DotsAndBoxesGridTest.java

@@ -27,5 +27,40 @@ public class DotsAndBoxesGridTest {
         assertTrue(true);
     }
 
-    // FIXME: You need to write tests for the two known bugs in the code.
+    // A test to check that the boxComplete function performs correctly 
+    @Test
+    public void testBoxComplete() {
+
+        // Creates a grid with a box starting at (0,0)
+        DotsAndBoxesGrid grid = new DotsAndBoxesGrid(15, 8, 2);
+        grid.drawHorizontal(0, 0, 1);
+        grid.drawHorizontal(0, 1, 1);
+        grid.drawVertical(0, 0, 1);
+        grid.drawVertical(1, 0, 1);
+
+        logger.info("This test checks that the boxComplete function works correctly");
+
+        assertAll(
+            "A complete box must return true, an incomplete must return false.",
+            () -> assertTrue(grid.boxComplete(0,0)),
+            // Returns false as the x,y co-ordinates passed are not the left and top co-ordinates of the box
+            () -> assertFalse(grid.boxComplete(1,1))
+        );
+    }
+    
+    // A test to check that the program throws an exception when a player attempts to draw a line in a position that
+    // has already been played
+    @Test
+    public void testDrawLine() {
+
+        // Creates a grid and draws a horizontal and vertical line at (0,0)
+        DotsAndBoxesGrid grid = new DotsAndBoxesGrid(15, 8, 2);
+        grid.drawHorizontal(0, 0, 1);
+        grid.drawVertical(0, 0, 1);
+
+        logger.info("This test checks that an exception is thrown when a player tries to draw a line that is already drawn");
+
+        assertThrows(IllegalStateException.class, () -> grid.drawHorizontal(0, 0, 1), "The horizontal line was drawn more than once");
+        assertThrows(IllegalStateException.class, () -> grid.drawVertical(0, 0, 1), "The vertical line was drawn more than once");
+    }
 }