lab_can_move y undefined below 0 (overflow)

src/main/c/labyrinth.c

@@ -61,7 +61,7 @@ short lab_can_move(Field_State** field, unsigned short x, unsigned short y, Dire
     if (x >= len_x){
         return 1;
     }
-	if (y == 1){
+	if (y >= len_y){
 		return 1;
 	}
 

src/test/c/test_labyrinth.c

@@ -445,6 +445,37 @@ void test_lab_can_move_at_0_0_direction_S_target_undefined_expected_1(void)
     free(field);
 }
 
+void test_lab_can_move_at_0_0_direction_W_target_undefined_expected_1(void)
+{
+    /* arrange */
+	unsigned short x = 0;
+	unsigned short y = 0;
+	Direction direction = W;
+	short expected = 1;
+	short actual;
+	
+	unsigned short len_x = 1, len_y = 1;
+    Field_State **field;
+
+    field = malloc(len_x * sizeof *field);
+    for (int c_index = 0; c_index < len_x; c_index++){
+        field[c_index] = malloc(len_y * sizeof field[c_index]);
+    }
+
+    /* act */
+    actual = lab_can_move(field, x, y, direction, len_x, len_y);
+
+    /* assert */
+	TEST_ASSERT_EQUAL_INT8(expected, actual);
+
+    for (int c_index = 0; c_index < len_x; c_index++)
+    {
+        free(field[c_index]);
+    }
+    free(field);
+}
+
+