code: def testProperties(self):
      v = self.create_variable()
      self.assertIsInstance(v.name, str)
      # _shared_name is also part of the interface. E.g. it's used in optimizer to
      # determine slot variable key.
      self.assertIsInstance(v._shared_name, str)
      self.assertIsNone(v.initializer)
      self.assertIsInstance(v.device, str)
      self.assertEqual(v.dtype, dtypes.float32)
      with self.assertRaises(AttributeError):
          v.op  # pylint: disable=pointless-statement
      with self.assertRaises(AttributeError):
          v.graph
  
imports: from absl.testing import parameterized
  from tensorflow.python.distribute import combinations
  from tensorflow.python.distribute import strategy_combinations
  from tensorflow.python.distribute import test_util
  from tensorflow.python.distribute import values_v2
  from tensorflow.python.eager import def_function
  from tensorflow.python.eager import test
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import indexed_slices
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import tensor
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import resource_variable_ops
  from tensorflow.python.ops import variables
label_desc: Use image node_id 23 for calling the _VariableInterfaceTestBase obj's underlying member method code with example usage: obj.testProperties() without return types