Added unit tests

src/test/java/dotsandboxes/DotsAndBoxesGridTest.java

@@ -9,14 +9,17 @@ 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.
+     * 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
+     * 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
@@ -27,5 +30,51 @@ public class DotsAndBoxesGridTest {
         assertTrue(true);
     }
 
-    // FIXME: You need to write tests for the two known bugs in the code.
+    @Test
+    public void boxCompleteDetectsCompletedBoxes() {
+        // code to test that boxComplete returns true for boxes that *are complete*
+        // A grid where we're going to draw a box, and then test whether it's complete
+        DotsAndBoxesGrid case1 = new DotsAndBoxesGrid(5, 5, 2);
+        case1.drawHorizontal(0, 0, 0);
+        case1.drawVertical(0, 0, 1);
+        case1.drawHorizontal(0, 1, 0);
+        case1.drawHorizontal(1, 0, 1);
+
+        assertTrue(case1.boxComplete(0, 0));
+
+    }
+
+    @Test
+    public void boxCompleteDetectsIncompleteBoxes() {
+        // code to test that boxComplete returns false for boxes that *are not complete*
+
+        // A grid where we're going to draw 1 side of a box, and then test whether it's
+        // complete
+        DotsAndBoxesGrid case1 = new DotsAndBoxesGrid(5, 5, 2);
+        case1.drawHorizontal(0, 0, 0);
+
+        assertFalse(case1.boxComplete(0, 0));
+    }
+
+    @Test
+    public void drawMethodsDetectRedrawnLines() {
+        // code to test that drawHorizontal throws an exception if the line was already
+        // drawn
+        // code to test that drawVertical throws an exception if the line was already
+        // drawn goes here
+        DotsAndBoxesGrid case1 = new DotsAndBoxesGrid(5, 5, 2);
+
+        // player 1 draws a horizontal line over the line player 0 has already drawn
+        case1.drawHorizontal(0, 0, 0);
+        assertThrows(IllegalStateException.class, () -> {
+            case1.drawHorizontal(0, 0, 1);
+        });
+
+        // players 1 draws a vertical line over the line player 0 has already drawn
+        case1.drawVertical(0, 0, 0);
+        assertThrows(IllegalStateException.class, () -> {
+            case1.drawVertical(0, 0, 1);
+        });
+    }
+
 }