Done unit test but failed

src/test/java/dotsandboxes/DotsAndBoxesGridTest.java

@@ -8,24 +8,36 @@ 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);
     }
 
-    // FIXME: You need to write tests for the two known bugs in the code.
+    @Test
+    public void testIsBoxComplete() {
+        DotsAndBoxesGrid grid = new DotsAndBoxesGrid(3, 3); // Example grid size
+        grid.drawHorizontalLine(0, 0); // Top line
+        grid.drawVerticalLine(0, 0); // Left line
+        grid.drawHorizontalLine(0, 1); // Bottom line
+        grid.drawVerticalLine(1, 0); // Right line
+
+        assertTrue(grid.isBoxComplete(0, 0), "The box should be complete");
+    }
+
+    @Test
+    public void testDrawLineAlreadyDrawn() {
+        DotsAndBoxesGrid grid = new DotsAndBoxesGrid(3, 3); // Example grid size
+        grid.drawHorizontalLine(0, 0); // Draw line once
+
+        IllegalStateException thrown = assertThrows(
+            IllegalStateException.class,
+            () -> grid.drawHorizontalLine(0, 0), // Try to draw the same line again
+            "Expected drawHorizontalLine() to throw, but it didn't"
+        );
+
+        assertTrue(thrown.getMessage().contains("Line already drawn"));
+    }
 }