code: def testStr(self):
      self.assertEqual("<unknown>", str(tensor_shape.unknown_shape()))
      self.assertEqual(
          "(None,)",
          str(tensor_shape.unknown_shape(rank=1)).replace("?", "None"),
      )
      self.assertEqual(
          "(None, None)",
          str(tensor_shape.unknown_shape(rank=2)).replace("?", "None"),
      )
      self.assertEqual(
          "(None, None, None)",
          str(tensor_shape.unknown_shape(rank=3)).replace("?", "None"),
      )
      self.assertEqual(
          "(32, None, 1, 9)",
          str(tensor_shape.TensorShape([32, None, 1, 9])).replace(
              "?", "None"
          ),
      )
      self.assertEqual("()", str(tensor_shape.TensorShape([])))
      self.assertEqual("(7,)", str(tensor_shape.TensorShape([7])))
      self.assertEqual("(3, 8)", str(tensor_shape.TensorShape([3, 8])))
      self.assertEqual(
          "(4, 5, 2)", str(tensor_shape.TensorShape([4, 5, 2]))
      )
  
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 16 for calling the ShapeTest obj's underlying member method code with example usage: obj.testStr() without return types