sdks/python/apache_beam/examples/snippets/transforms/aggregation/distinct_test.py

# coding=utf-8
#
# 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
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from __future__ import absolute_import
from __future__ import print_function

import unittest

import mock

from apache_beam.examples.snippets.util import assert_matches_stdout
from apache_beam.testing.test_pipeline import TestPipeline

from . import distinct


def check_unique_elements(actual):
  expected = '''[START unique_elements]
🥕
🍆
🍅
[END unique_elements]'''.splitlines()[1:-1]
  assert_matches_stdout(actual, expected)


@mock.patch('apache_beam.Pipeline', TestPipeline)
@mock.patch(
    'apache_beam.examples.snippets.transforms.aggregation.distinct.print', str)
class DistinctTest(unittest.TestCase):
  def test_distinct(self):
    distinct.distinct(check_unique_elements)


if __name__ == '__main__':
  unittest.main()