Do not fix the bugs in the commit. The units tests should fail.

src/test/java/dotsandboxes/DotsAndBoxesGridTest.java

@@ -2,6 +2,7 @@ package dotsandboxes;
 
 import org.junit.jupiter.api.*;
 import static org.junit.jupiter.api.Assertions.*;
+import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assumptions.*;
 
 import org.apache.logging.log4j.LogManager;
@@ -28,4 +29,30 @@ public class DotsAndBoxesGridTest {
     }
 
     // FIXME: You need to write tests for the two known bugs in the code.
+    @Test
+    public void testBoxComplete() {
+        logger.info("testing whether the box is complete is wrong");
+        int x = 1;
+        int y = 1;
+        int p = 1;
+        DotsAndBoxesGrid z = new DotsAndBoxesGrid(x, y, p);
+
+        assertTrue(z.boxComplete(x, y));
+
+    }
+
+    @Test
+    public void testExistingLine (){
+        logger.info("testing exception is thrown when line exists");
+        int x = 1;
+        int y = 1;
+        int p = 1;
+
+        DotsAndBoxesGrid z = new DotsAndBoxesGrid(x, y, p);
+
+        z.getHorizontal(x, y);
+
+        assertThrows(IllegalStateException.class, () -> z.drawHorizontal(x, y, p), "The line exists");
+    }
+
 }
\ No newline at end of file