code: def test_subclass():
      class Subclass(_NamedMixin):
          def __init__(self, name):
              self.name = name
  
      instance = Subclass("name")
      assert instance.name == "name"
  
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 1 for calling the TestNamedMixin obj's underlying member method code with example usage: obj.test_subclass() without return types