autocomplete_test.py

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"""Test for the autocomplete example."""

import unittest

import apache_beam as beam
from apache_beam.examples.complete import autocomplete
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 AutocompleteTest(unittest.TestCase):

  WORDS = ['this', 'this', 'that', 'to', 'to', 'to']

  def test_top_prefixes(self):
    with TestPipeline() as p:
      words = p | beam.Create(self.WORDS)
      result = words | autocomplete.TopPerPrefix(5)
      # values must be hashable for now
      result = result | beam.Map(lambda (k, vs): (k, tuple(vs)))
      assert_that(result, equal_to(
          [
              ('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'), )),
          ]))


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