code: def test_types_with_nothing(self) -> None:
      # GIVEN
      to_parse = "foobar"
  
      # WHEN
      req = Requirement(to_parse)
  
      # THEN
      assert isinstance(req.name, str)
      assert isinstance(req.extras, set)
      assert req.url is None
      assert isinstance(req.specifier, SpecifierSet)
      assert req.marker is None
  
imports: from typing import Optional, Set
  import pytest
  from packaging.markers import Marker
  from packaging.requirements import InvalidRequirement, Requirement
  from packaging.specifiers import SpecifierSet
label_desc: Use image node_id 1 for calling the TestRequirementBehaviour obj's underlying member method code with example usage: obj.test_types_with_nothing() without return types