Fix bugs in the code

src/test/java/dotsandboxes/DotsAndBoxesGame.java

+public class DotsAndBoxesGame {
+    private boolean[][] horizontalLines;
+    private boolean[][] verticalLines;
+    private int gridSize;
+
+    public DotsAndBoxesGame(int gridSize) {
+        this.gridSize = gridSize;
+        horizontalLines = new boolean[gridSize + 1][gridSize];
+        verticalLines = new boolean[gridSize][gridSize + 1];
+    }
+
+    public boolean drawHorizontalLine(int row, int col) {
+        if (row >= 0 && row < gridSize + 1 && col >= 0 && col < gridSize && !horizontalLines[row][col]) {
+            horizontalLines[row][col] = true;
+            return true;
+        }
+        return false;
+    }
+
+    public boolean drawVerticalLine(int row, int col) {
+        if (row >= 0 && row < gridSize && col >= 0 && col < gridSize + 1 && !verticalLines[row][col]) {
+            verticalLines[row][col] = true;
+            return true;
+        }
+        return false;
+    }
+
+    public boolean isLineDrawn(int row, int col, LineType type) {
+        if (type == LineType.HORIZONTAL) {
+            return horizontalLines[row][col];
+        } else if (type == LineType.VERTICAL) {
+            return verticalLines[row][col];
+        }
+        return false;
+    }
+
+    public boolean isSquareComplete(int row, int col) {
+        return isLineDrawn(row, col, LineType.HORIZONTAL) &&
+               isLineDrawn(row + 1, col, LineType.HORIZONTAL) &&
+               isLineDrawn(row, col, LineType.VERTICAL) &&
+               isLineDrawn(row, col + 1, LineType.VERTICAL);
+    }
+}
+
+enum LineType {
+    HORIZONTAL, VERTICAL
+}

src/test/java/dotsandboxes/DotsAndBoxesGridTest.java

@@ -7,7 +7,7 @@ public class DotsAndBoxesGameTest {
     @Test
     public void testSquareComplete() {
         // Given
-        DotsAndBoxesGame game = new DotsAndBoxesGame();
+        DotsAndBoxesGame game = new DotsAndBoxesGame(2);
         // Assuming the following lines form a complete square
         game.drawHorizontalLine(0, 0);
         game.drawHorizontalLine(0, 1);