lab_can_move x undefined over 0

src/main/c/labyrinth.c

@@ -58,7 +58,7 @@ void init_field(Field_State** field, unsigned short len_x, unsigned short len_y)
 short lab_can_move(Field_State** field, unsigned short x, unsigned short y, Direction direction, unsigned short len_x, unsigned short len_y){
 
     lab_move(&x, &y, direction);
-    if (x == 65535){
+    if (x >= len_x){
         return 1;
     }
 	if (y == 1){

src/test/c/test_labyrinth.c

@@ -415,5 +415,36 @@ void test_lab_can_move_at_0_0_direction_E_target_undefined_expected_1(void)
     free(field);
 }
 
+void test_lab_can_move_at_0_0_direction_S_target_undefined_expected_1(void)
+{
+    /* arrange */
+	unsigned short x = 0;
+	unsigned short y = 0;
+	Direction direction = S;
+	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);
+}
+
+