lab_move direction W y --> y - 1

src/main/c/labyrinth.c

@@ -37,7 +37,7 @@ void lab_move(unsigned short *x, unsigned short *y, Direction direction){
         return;
     }
     if (direction == W){
-        *y = 0;
+        *y = *y - 1;
         return;
     }
 

src/test/c/test_labyrinth.c

@@ -183,3 +183,20 @@ void test_lab_move_from_1_1_W_expected_1_0(void)
 	TEST_ASSERT_TRUE(x == x_expected && y == y_expected);
 }
 
+void test_lab_move_from_5_5_W_expected_5_4(void)
+{
+    /* arrange */
+	unsigned short x = 5;
+	unsigned short y = 5;
+    Direction direction = W;
+	
+	unsigned short x_expected = 5;
+	unsigned short y_expected = 4;
+
+    /* act */
+    lab_move(&x, &y, direction);
+
+    /* assert */
+	TEST_ASSERT_TRUE(x == x_expected && y == y_expected);
+}
+