Add failing unit tests to highlight known bugs in DotsAndBoxesGrid

src/test/java/dotsandboxes/DotsAndBoxesGridTest.java

@@ -13,6 +13,7 @@ public class DotsAndBoxesGridTest {
      * This field is a logger. Loggers are like a more advanced println, for writing messages out to the console or a log file.
      */
     private static final Logger logger = LogManager.getLogger(DotsAndBoxesGridTest.class);
+    private DotsAndBoxesGrid grid;
 
     /*
      * Tests are functions that have an @Test annotation before them.
@@ -27,5 +28,38 @@ public class DotsAndBoxesGridTest {
         assertTrue(true);
     }
 
-    // FIXME: You need to write tests for the two known bugs in the code.
+    @BeforeEach
+    public void setup() {
+        grid = new DotsAndBoxesGrid(3, 3, 2); // Assuming a 3x3 grid with 2 players
+    }
+
+    @Test
+    public void testBoxNotCompleteInitially() {
+        assertFalse(grid.boxComplete(0, 0), "Box should not be complete without any lines drawn.");
+    }
+
+    @Test
+    public void testCompleteBox() {
+        // Draw all four lines around a single box
+        grid.drawHorizontal(0, 0, 1);
+        grid.drawHorizontal(0, 1, 1);
+        grid.drawVertical(0, 0, 1);
+        grid.drawVertical(1, 0, 1);
+
+        assertTrue(grid.boxComplete(0, 0), "Box at (0, 0) should be complete.");
+    }
+
+    @Test
+    public void testRedrawingHorizontalLineThrowsException() {
+        grid.drawHorizontal(0, 0, 1);
+        Exception exception = assertThrows(IllegalStateException.class, () -> grid.drawHorizontal(0, 0, 1));
+        assertEquals("Line already drawn.", exception.getMessage(), "Should throw an exception when redrawing a horizontal line.");
+    }
+
+    @Test
+    public void testRedrawingVerticalLineThrowsException() {
+        grid.drawVertical(0, 0, 1);
+        Exception exception = assertThrows(IllegalStateException.class, () -> grid.drawVertical(0, 0, 1));
+        assertEquals("Line already drawn.", exception.getMessage(), "Should throw an exception when redrawing a vertical line.");
+    }
 }