code: def test_iter(self):
      layout_map = distribution_lib.LayoutMap(self.device_mesh)
  
      layout_map["dense/kernel"] = self.sharded_2d
      layout_map["dense/bias"] = self.sharded_1d
  
      # Make sure the items are ordered based on the insertion order.
      self.assertEqual(
          list(layout_map.keys()), ["dense/kernel", "dense/bias"]
      )
  
      keys = []
      values = []
      for k, v in layout_map.items():
          keys.append(k)
          values.append(v)
  
      self.assertEqual(keys, ["dense/kernel", "dense/bias"])
      self.assertEqual(values, [self.sharded_2d, self.sharded_1d])
  
imports: import os
  from unittest import mock
  import numpy
  import pytest
  import tensorflow
  from keras import backend
  from keras import testing
  from keras.backend import distribution_lib
  from keras.distribution import distribution_lib
label_desc: Use image node_id 6 for calling the LayoutMapTest obj's underlying member method code with example usage: obj.test_iter() without return types