code: def _named_mixin_fixture(self):
      class Subclass(_NamedMixin):
          def __init__(self, name):
              self.name = name
  
      self.Subclass = Subclass
  
file_path: sympy/sympy/physics/biomechanics/tests/test_mixin.py
imports: import pytest
  from sympy.physics.biomechanics._mixin import _NamedMixin
label_desc: Use image node_id 2 for calling the TestNamedMixin obj's underlying member method code with example usage: obj._named_mixin_fixture() without return types