new_contents: import pytest  # type: ignore
  
  from ppb_vector import Vector2
  from utils import *
  
  @pytest.mark.parametrize('vector_like', UNIT_VECTOR_LIKES) # type: ignore
  def test_convert_subclass(vector_like):
      class V(Vector2): pass
  
      # test_binop_vectorlike already checks the output value is correct
      assert isinstance(V.convert(vector_like), V)
  
subject: Add a test for Vector2.convert