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

from __future__ import absolute_import

import unittest

from apache_beam import Create
from apache_beam.testing.test_pipeline import TestPipeline
from apache_beam.testing.util import TestWindowedValue
from apache_beam.testing.util import assert_that
from apache_beam.testing.util import equal_to
from apache_beam.testing.util import is_empty
from apache_beam.transforms.window import GlobalWindow
from apache_beam.transforms.window import IntervalWindow
from apache_beam.utils.timestamp import MIN_TIMESTAMP


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

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

  def test_assert_that_passes_empty_equal_to(self):
    with TestPipeline() as p:
      assert_that(p | Create([]), equal_to([]))

  def test_assert_that_passes_empty_is_empty(self):
    with TestPipeline() as p:
      assert_that(p | Create([]), is_empty())

  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_reified_value_passes(self):
    expected = [TestWindowedValue(v, MIN_TIMESTAMP, [GlobalWindow()])
                for v in [1, 2, 3]]
    with TestPipeline() as p:
      assert_that(p | Create([2, 3, 1]), equal_to(expected), reify_windows=True)

  def test_reified_value_assert_fail_unmatched_value(self):
    expected = [TestWindowedValue(v + 1, MIN_TIMESTAMP, [GlobalWindow()])
                for v in [1, 2, 3]]
    with self.assertRaises(Exception):
      with TestPipeline() as p:
        assert_that(p | Create([2, 3, 1]), equal_to(expected),
                    reify_windows=True)

  def test_reified_value_assert_fail_unmatched_timestamp(self):
    expected = [TestWindowedValue(v, 1, [GlobalWindow()])
                for v in [1, 2, 3]]
    with self.assertRaises(Exception):
      with TestPipeline() as p:
        assert_that(p | Create([2, 3, 1]), equal_to(expected),
                    reify_windows=True)

  def test_reified_value_assert_fail_unmatched_window(self):
    expected = [TestWindowedValue(v, MIN_TIMESTAMP, [IntervalWindow(0, 1)])
                for v in [1, 2, 3]]
    with self.assertRaises(Exception):
      with TestPipeline() as p:
        assert_that(p | Create([2, 3, 1]), equal_to(expected),
                    reify_windows=True)

  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()