custom_ptransform_test.py

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"""Tests for the various custom Count implementation examples."""

import logging
import unittest

import apache_beam as beam
from apache_beam.examples.cookbook import custom_ptransform
from apache_beam.testing.test_pipeline import TestPipeline
from apache_beam.testing.util import assert_that
from apache_beam.testing.util import equal_to


class CustomCountTest(unittest.TestCase):

  def test_count1(self):
    self.run_pipeline(custom_ptransform.Count1())

  def test_count2(self):
    self.run_pipeline(custom_ptransform.Count2())

  def test_count3(self):
    factor = 2
    self.run_pipeline(custom_ptransform.Count3(factor), factor=factor)

  def run_pipeline(self, count_implementation, factor=1):
    with TestPipeline() as p:
      words = p | beam.Create(['CAT', 'DOG', 'CAT', 'CAT', 'DOG'])
      result = words | count_implementation
      assert_that(
          result, equal_to([('CAT', (3 * factor)), ('DOG', (2 * factor))]))


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