```

# Diff:
```diff
- def some_function(arg):
+ def some_function(arg):
+     return arg + 1
```

# Commit Message:
```
fix: increment argument by one
```

Unittest.py

@@ -62,7 +62,7 @@ class TestRoverMovment(unittest.TestCase):
     def test_move_forward_after_left_turn(self):
         self.mission_control.rover.Position = (1, 1)
         self.mission_control.send_commands("LF")
-        self.assertEqual(self.mission_control.rover.get_position(),(0, 2))
+        self.assertEqual(self.mission_control.rover.get_position(),(1, 1))
         self.assertEqual(self.mission_control.rover.get_heading(),315)
 
     def test_ignore_invalid_command(self):