turn_direction_right W --> N

src/main/c/labyrinth.c

@@ -16,5 +16,8 @@ void turn_direction_right(Direction *direction){
         case S:
             *direction = W;
             break;
+        case W:
+            *direction = N;
+            break;
     }
 }

src/test/c/test_labyrinth.c

@@ -51,3 +51,16 @@ void test_turn_direction_right_from_S_expected_W(void)
 	TEST_ASSERT_TRUE(expected == actual);
 }
 
+void test_turn_direction_right_from_W_expected_N(void)
+{
+    /* arrange */
+    Direction actual = W;
+    Direction expected = N;
+
+    /* act */
+    turn_direction_right(&actual);
+
+    /* assert */
+	TEST_ASSERT_TRUE(expected == actual);
+}
+