code: def testInvalid(self):
      with self.assertRaises(TypeError):
          dtypes.DType(types_pb2.DT_INVALID)
      with self.assertRaises(TypeError):
          dtypes.as_dtype(types_pb2.DT_INVALID)
  
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 5 for calling the TypesTest obj's underlying member method code with example usage: obj.testInvalid() without return types