code: def testZeroLengthDim(self):
      x = array_ops.zeros(shape=(0, 1, 2))
      y = self.evaluate(array_ops_stack.unstack(x, axis=1)[0])
      self.assertEqual(y.shape, (0, 2))
  
imports: import numpy
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import array_ops_stack
  from tensorflow.python.ops import gradient_checker_v2
  from tensorflow.python.platform import test
label_desc: Use image node_id 15 for calling the UnstackOpTest obj's underlying member method code with example usage: obj.testZeroLengthDim() without return types