sdks/python/apache_beam/testing/util_test.py

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"""Unit tests for testing utilities."""

import unittest

from apache_beam import Create
from apache_beam.testing.test_pipeline import TestPipeline
from apache_beam.testing.util import assert_that, equal_to, is_empty


class UtilTest(unittest.TestCase):

  def test_assert_that_passes(self):
    with TestPipeline() as p:
      assert_that(p | Create([1, 2, 3]), equal_to([1, 2, 3]))

  def test_assert_that_fails(self):
    with self.assertRaises(Exception):
      with TestPipeline() as p:
        assert_that(p | Create([1, 10, 100]), equal_to([1, 2, 3]))

  def test_assert_that_fails_on_empty_input(self):
    with self.assertRaises(Exception):
      with TestPipeline() as p:
        assert_that(p | Create([]), equal_to([1, 2, 3]))

  def test_assert_that_fails_on_empty_expected(self):
    with self.assertRaises(Exception):
      with TestPipeline() as p:
        assert_that(p | Create([1, 2, 3]), is_empty())


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