code: def testAsDtypeReturnsInternedVersion(self):
      dt = dtypes.DType(types_pb2.DT_VARIANT)
      self.assertIs(dtypes.as_dtype(dt), dtypes.variant)
  
imports: from absl.testing import parameterized
  import numpy
  from tensorflow.python.framework import _dtypes
  from tensorflow.core.framework import types_pb2
  from tensorflow.core.function import trace_type
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import test_util
  from tensorflow.python.platform import googletest
label_desc: Use image node_id 22 for calling the TypesTest obj's underlying member method code with example usage: obj.testAsDtypeReturnsInternedVersion() without return types