Wrote unit tests for known bugs

src/test/java/dotsandboxes/DotsAndBoxesGridTest.java

@@ -13,6 +13,18 @@ public class DotsAndBoxesGridTest {
      * 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);
+    public static DotsAndBoxesGrid grid;
+
+    @BeforeAll
+    public static void beforeAll(){
+        logger.info("Running 'before all' setup");
+    }
+
+    @BeforeEach
+    public void beforeEach(){
+        logger.info("Running 'before each' setup");
+        grid = new DotsAndBoxesGrid(3,3,2);
+    }
 
     /*
      * Tests are functions that have an @Test annotation before them.
@@ -28,4 +40,35 @@ public class DotsAndBoxesGridTest {
     }
 
     // FIXME: You need to write tests for the two known bugs in the code.
+
+    @Test
+    public void testBoxIsComplete() {
+        logger.info("Checking completed box is correctly detected");
+
+        //empty grid, test top left box
+        assertFalse(grid.boxComplete(0,0));
+
+        //draw top horizontal and test
+        grid.drawHorizontal(0,0,1);
+        assertFalse(grid.boxComplete(0,0));
+
+        //draw left vertical and test
+        grid.drawVertical(0,0,1);
+        assertFalse(grid.boxComplete(0,0));
+
+        //draw bottom horizontal and test
+        grid.drawHorizontal(0,1,1);
+        assertFalse(grid.boxComplete(0,0));
+
+        //draw right vertical and test, box now complete
+        grid.drawVertical(1,0,1);
+        assertTrue(grid.boxComplete(0,0));
+    }
+
+    @Test
+    public void testCantRedrawLine(){
+        //draw line first time
+        grid.drawHorizontal(0,0,1);
+        assertThrows(IllegalStateException.class, () -> grid.drawHorizontal(0,0,2));
+    }
 }