sdks/python/apache_beam/examples/complete/autocomplete_it_test.py

#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You 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.
#

"""End-to-end test for Autocomplete example."""
# pytype: skip-file

import logging
import re
import unittest
import uuid

import pytest

from apache_beam.examples.complete import autocomplete
from apache_beam.testing.test_pipeline import TestPipeline
from apache_beam.testing.test_utils import create_file
from apache_beam.testing.test_utils import read_files_from_pattern


def format_output_file(output_string):
  def extract_prefix_topk_words_tuples(line):
    match = re.match(r'(.*): \[(.*)\]', line)
    prefix = match.group(1)
    topK_words_string = extract_top_k_words_tuples(match.group(2))
    return prefix, topK_words_string

  def extract_top_k_words_tuples(top_k_words_string):
    top_k_list = top_k_words_string.split("), (")
    return tuple(
        map(
            lambda top_k_string: tuple(format_top_k_tuples(top_k_string)),
            top_k_list))

  def format_top_k_tuples(top_k_string):
    (frequency, words) = top_k_string.replace('(', '').replace(')', '').replace(
        '\"', '').replace('\'', '').replace(' ', '').split(',')
    return int(frequency), words

  return list(
      map(
          lambda line: extract_prefix_topk_words_tuples(line),
          output_string.split('\n')))


class AutocompleteIT(unittest.TestCase):
  WORDS = ['this', 'this', 'that', 'to', 'to', 'to']
  EXPECTED_PREFIXES = [
      ('t', ((3, 'to'), (2, 'this'), (1, 'that'))),
      ('to', ((3, 'to'), )),
      ('th', ((2, 'this'), (1, 'that'))),
      ('thi', ((2, 'this'), )),
      ('this', ((2, 'this'), )),
      ('tha', ((1, 'that'), )),
      ('that', ((1, 'that'), )),
  ]

  @pytest.mark.no_xdist
  @pytest.mark.examples_postcommit
  def test_autocomplete_output_files_on_small_input(self):
    test_pipeline = TestPipeline(is_integration_test=True)
    # Setup the files with expected content.
    OUTPUT_FILE_DIR = \
        'gs://temp-storage-for-end-to-end-tests/py-it-cloud/output'
    output = '/'.join([OUTPUT_FILE_DIR, str(uuid.uuid4()), 'result'])
    INPUT_FILE_DIR = \
        'gs://temp-storage-for-end-to-end-tests/py-it-cloud/input'
    input = '/'.join([INPUT_FILE_DIR, str(uuid.uuid4()), 'input.txt'])
    create_file(input, ' '.join(self.WORDS))
    extra_opts = {'input': input, 'output': output}

    autocomplete.run(test_pipeline.get_full_options_as_args(**extra_opts))

    # Load result file and compare.
    result = read_files_from_pattern('%s*' % output).strip()

    self.assertEqual(
        sorted(self.EXPECTED_PREFIXES), sorted(format_output_file(result)))


if __name__ == '__main__':
  logging.getLogger().setLevel(logging.INFO)
  unittest.main()