text: # Copyright 2020 Alibaba Group Holding Limited. All Rights Reserved.
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  # =============================================================================
  """ Local UT test, run with `sh test_python_ut.sh`.
  """
  from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  
  import unittest
  
  import graphlearn as gl
  import graphlearn.python.tests.utils as utils
  from graphlearn.python.tests.test_node import NodeTestCase
  
  
  class NodeIterateTestCase(NodeTestCase):
    def test_node_iterate(self):
      file_path = self.gen_test_data([utils.ATTRIBUTED])
      decoder = gl.Decoder(attr_types=utils.ATTR_TYPES)
      g = gl.Graph() \
        .node(source=file_path, node_type=self.node_type_, decoder=decoder)
      g.init(server_id=0, server_count=1, tracker=utils.TRACKER_PATH)
  
      batch_size = 4
      sampler = g.V('user').batch(batch_size).shuffle(traverse=True).values()
      res_ids = []
      max_iter = 100
      for i in range(max_iter):
        try:
          nodes = sampler.next()
          utils.check_node_attrs(nodes)
          res_ids.extend(list(nodes.ids))
        except gl.OutOfRangeError:
          break
      ids = range(self.value_range_[0][0], self.value_range_[0][1])
      utils.check_sorted_equal(res_ids, ids)
  
  
  if __name__ == "__main__":
    unittest.main()
  