code: def testCreateMeshWithExistingName(self):
      tpu_util.create_tpu_mesh(["x"], [2], "mesh_with_existing_name")
      with self.assertRaises(ValueError):
          tpu_util.create_tpu_mesh(
              ["x"], [2], "mesh_with_existing_name"
          )
  
imports: from tensorflow.dtensor.python import accelerator_util
  from tensorflow.dtensor.python import layout
  from tensorflow.dtensor.python import numpy_util
  from tensorflow.dtensor.python import tpu_util
  from tensorflow.dtensor.python.tests import test_util
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.ops import math_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 25 for calling the DeviceAssignmentTest obj's underlying member method code with example usage: obj.testCreateMeshWithExistingName() without return types