code: def testShareGPU(self):
      self.assertLen(
          context.context().list_physical_devices("GPU"),
          combinations.env().total_phsyical_gpus,
      )
  
imports: import importlib
  import os
  import sys
  import unittest
  from absl.testing import parameterized
  from tensorflow.python.distribute import combinations
  from tensorflow.python.distribute import test_util
  from tensorflow.python.distribute.cluster_resolver import tfconfig_cluster_resolver
  from tensorflow.python.eager import context
  from tensorflow.python.framework import combinations
  from tensorflow.python.platform import test
label_desc: Use image node_id 2 for calling the ShareGPUTest obj's underlying member method code with example usage: obj.testShareGPU() without return types