new_contents: import pytest
  
  from netsgiro.converters import value_or_none, truthy_or_none, to_bool
  
  values = [
      (int, None, None, None),
      (int, 1, 1, 1),
      (int, 1.5, 1, 1),
      (float, 1.5, 1.5, 1.5),
      (bool, 1.5, True, True),
      (bool, 0, False, None),  # different
  ]
  
  
  @pytest.mark.parametrize('c, v, v1, v2', values)
  def test_value_or_none(c, v, v1, v2):
      """
      Test the value or none and truthy or none converters.
  
      They're almost identical.
      """
      assert value_or_none(c)(v) == v1
      assert truthy_or_none(c)(v) == v2
  
  
  def test_to_bool():
      assert to_bool(True) is True
      assert to_bool(False) is False
      assert to_bool('J') is True
      assert to_bool('N') is False
      for v in [None, 'S', '', [], {}]:
          with pytest.raises(ValueError, match="Expected 'J' or 'N', got "):
              to_bool(v)
  
subject: Add tests for untested converters