code: def setUp(self):
      super().setUp()
      self.enter_context(mock.patch.object(config, "_values", {}))
      self._flag = bool_flag(
          "test", default=False, help="Just a test flag."
      )
  
file_path: flax/tests/configurations_test.py
imports: from unittest import mock
  from absl.testing import absltest
  from flax.configurations import bool_flag, config
label_desc: Use image node_id 1 for calling the MyTestCase obj's underlying member method code with example usage: obj.setUp() without return types