Added unit tests for square completion and duplicate line drawing

src/test/java/dotsandboxes/DotsAndBoxesGridTest.java

 package dotsandboxes;
 
-import org.junit.jupiter.api.*;
+import org.junit.jupiter.api.Test;
 import static org.junit.jupiter.api.Assertions.*;
-import static org.junit.jupiter.api.Assumptions.*;
-
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
 public class DotsAndBoxesGridTest {
-    /*
-     * Because Test classes are classes, they can have fields, and can have static fields.
-     * 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);
 
-    /*
-     * Tests are functions that have an @Test annotation before them.
-     * The typical format of a test is that it contains some code that does something, and then one
-     * or more assertions to check that a condition holds.
-     *
-     * This is a dummy test just to show that the test suite itself runs
-     */
     @Test
     public void testTestSuiteRuns() {
         logger.info("Dummy test to show the test suite runs");
         assertTrue(true);
     }
+
     @Test
     public void testSquareCompletion() {
         logger.info("Testing if square completion detection is working");
-        DotsAndBoxesGrid grid = new DotsAndBoxesGrid(3, 3);
+
+        // Initialize the grid with dimensions and number of players
+        DotsAndBoxesGrid grid = new DotsAndBoxesGrid(3, 3, 2);
         
         // Simulate drawing lines to complete a square at (0,0)
         grid.drawHorizontal(0, 0, 1);
@@ -37,14 +27,16 @@ public class DotsAndBoxesGridTest {
         grid.drawHorizontal(0, 1, 1);
         grid.drawVertical(1, 0, 1);
 
-        // The square at (0,0) should be complete
-        assertTrue(grid.isSquareComplete(0, 0), "Square at (0,0) should be complete");
+        // Check if the square at (0,0) is complete
+        assertTrue(grid.boxComplete(0, 0), "Square at (0,0) should be complete");
     }
 
     @Test
     public void testDrawingLineTwiceThrowsException() {
         logger.info("Testing if drawing a line twice throws an IllegalStateException");
-        DotsAndBoxesGrid grid = new DotsAndBoxesGrid(3, 3);
+
+        // Initialize the grid with dimensions and number of players
+        DotsAndBoxesGrid grid = new DotsAndBoxesGrid(3, 3, 2);
 
         // Simulate drawing a horizontal line
         grid.drawHorizontal(0, 0, 1);
@@ -53,3 +45,4 @@ public class DotsAndBoxesGridTest {
         assertThrows(IllegalStateException.class, () -> grid.drawHorizontal(0, 0, 1));
     }
 }
+