code: def testRepr(self):
      self.assertEqual(repr(tensor_shape.Dimension(7)), "Dimension(7)")
      self.assertEqual(
          repr(tensor_shape.Dimension(None)), "Dimension(None)"
      )
  
imports: from absl.testing import parameterized
  from tensorflow.core.framework import tensor_shape_pb2
  from tensorflow.core.function import trace_type
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import tensor_shape
  from tensorflow.python.framework import test_util
  from tensorflow.python.platform import googletest
label_desc: Use image node_id 9 for calling the DimensionTest obj's underlying member method code with example usage: obj.testRepr() without return types