#
# 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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"""Tests for util.py."""
from __future__ import absolute_import

import unittest

from apache_beam.io.gcp.datastore.v1 import util


class MovingSumTest(unittest.TestCase):

  TIMESTAMP = 1500000000

  def test_bad_bucket_size(self):
    with self.assertRaises(ValueError):
      _ = util.MovingSum(1, 0)

  def test_bad_window_size(self):
    with self.assertRaises(ValueError):
      _ = util.MovingSum(1, 2)

  def test_no_data(self):
    ms = util.MovingSum(10, 1)
    self.assertEqual(0, ms.sum(MovingSumTest.TIMESTAMP))
    self.assertEqual(0, ms.count(MovingSumTest.TIMESTAMP))
    self.assertFalse(ms.has_data(MovingSumTest.TIMESTAMP))

  def test_one_data_point(self):
    ms = util.MovingSum(10, 1)
    ms.add(MovingSumTest.TIMESTAMP, 5)
    self.assertEqual(5, ms.sum(MovingSumTest.TIMESTAMP))
    self.assertEqual(1, ms.count(MovingSumTest.TIMESTAMP))
    self.assertTrue(ms.has_data(MovingSumTest.TIMESTAMP))

  def test_aggregates_within_window(self):
    ms = util.MovingSum(10, 1)
    ms.add(MovingSumTest.TIMESTAMP, 5)
    ms.add(MovingSumTest.TIMESTAMP+1, 3)
    ms.add(MovingSumTest.TIMESTAMP+2, 7)
    self.assertEqual(15, ms.sum(MovingSumTest.TIMESTAMP+3))
    self.assertEqual(3, ms.count(MovingSumTest.TIMESTAMP+3))

  def test_data_expires_from_moving_window(self):
    ms = util.MovingSum(5, 1)
    ms.add(MovingSumTest.TIMESTAMP, 5)
    ms.add(MovingSumTest.TIMESTAMP+3, 3)
    ms.add(MovingSumTest.TIMESTAMP+6, 7)
    self.assertEqual(10, ms.sum(MovingSumTest.TIMESTAMP+7))
    self.assertEqual(2, ms.count(MovingSumTest.TIMESTAMP+7))


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