Added failing unit tests for known bugs in square completion and duplicate line draw

src/test/java/dotsandboxes/DotsAndBoxesGridTest.java

@@ -20,12 +20,30 @@ public class DotsAndBoxesGridTest {
      * or more assertions to check that a condition holds.
      *
      * This is a dummy test just to show that the test suite itself runs
+     * Following are the Unit testing done
      */
+    
      @Test
-    public void testTestSuiteRuns() {
-        logger.info("Dummy test to show the test suite runs");
-        assertTrue(true);
+     public void testIncompleteSquare() {
+         DotsAndBoxesGrid grid = new DotsAndBoxesGrid(3, 3, 2); // Create a 3x3 grid
+ 
+         // Mark only two lines of a square (incomplete)
+         grid.drawHorizontal(0, 0, 1);
+         grid.drawVertical(0, 1, 1);
+ 
+         // Assert that the square is not complete
+         assertFalse(grid.boxComplete(0, 0), "Square should not be complete with only two lines");
      }
  
-    // FIXME: You need to write tests for the two known bugs in the code.
+     @Test
+     public void testDuplicateLineDrawing() {
+         DotsAndBoxesGrid grid = new DotsAndBoxesGrid(3, 3, 2); // Create a 3x3 grid
+ 
+         // Mark a horizontal line
+         grid.drawHorizontal(0, 0, 1);
+ 
+         // Attempt to draw the same line again
+         assertThrows(IllegalStateException.class, () -> grid.drawHorizontal(0, 0, 1),
+                 "Duplicate line drawing should throw an IllegalStateException");
+     }
     }
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