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# -*- coding: utf-8 -*-
# Copyright (C) 2014 Yahoo! Inc. All Rights Reserved.
#
# Licensed 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
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import string
from taskflow import test
from taskflow.utils import iter_utils
def forever_it():
i = 0
while True:
yield i
i += 1
class IterUtilsTest(test.TestCase):
def test_fill_empty(self):
self.assertEqual([], list(iter_utils.fill([1, 2, 3], 0)))
def test_bad_unique_seen(self):
iters = [
['a', 'b'],
2,
None,
object(),
]
self.assertRaises(ValueError,
iter_utils.unique_seen, iters)
def test_generate_delays(self):
it = iter_utils.generate_delays(1, 60)
self.assertEqual(1, next(it))
self.assertEqual(2, next(it))
self.assertEqual(4, next(it))
self.assertEqual(8, next(it))
self.assertEqual(16, next(it))
self.assertEqual(32, next(it))
self.assertEqual(60, next(it))
self.assertEqual(60, next(it))
def test_generate_delays_custom_multiplier(self):
it = iter_utils.generate_delays(1, 60, multiplier=4)
self.assertEqual(1, next(it))
self.assertEqual(4, next(it))
self.assertEqual(16, next(it))
self.assertEqual(60, next(it))
self.assertEqual(60, next(it))
def test_generate_delays_bad(self):
self.assertRaises(ValueError, iter_utils.generate_delays, -1, -1)
self.assertRaises(ValueError, iter_utils.generate_delays, -1, 2)
self.assertRaises(ValueError, iter_utils.generate_delays, 2, -1)
self.assertRaises(ValueError, iter_utils.generate_delays, 1, 1,
multiplier=0.5)
def test_unique_seen(self):
iters = [
['a', 'b'],
['a', 'c', 'd'],
['a', 'e', 'f'],
['f', 'm', 'n'],
]
self.assertEqual(['a', 'b', 'c', 'd', 'e', 'f', 'm', 'n'],
list(iter_utils.unique_seen(iters)))
def test_unique_seen_empty(self):
iters = []
self.assertEqual([], list(iter_utils.unique_seen(iters)))
def test_unique_seen_selector(self):
iters = [
[(1, 'a'), (1, 'a')],
[(2, 'b')],
[(3, 'c')],
[(1, 'a'), (3, 'c')],
]
it = iter_utils.unique_seen(iters,
seen_selector=lambda value: value[0])
self.assertEqual([(1, 'a'), (2, 'b'), (3, 'c')], list(it))
def test_bad_fill(self):
self.assertRaises(ValueError, iter_utils.fill, 2, 2)
def test_fill_many_empty(self):
result = list(iter_utils.fill(range(0, 50), 500))
self.assertEqual(450, sum(1 for x in result if x is None))
self.assertEqual(50, sum(1 for x in result if x is not None))
def test_fill_custom_filler(self):
self.assertEqual("abcd",
"".join(iter_utils.fill("abc", 4, filler='d')))
def test_fill_less_needed(self):
self.assertEqual("ab", "".join(iter_utils.fill("abc", 2)))
def test_fill(self):
self.assertEqual([None, None], list(iter_utils.fill([], 2)))
self.assertEqual((None, None), tuple(iter_utils.fill([], 2)))
def test_bad_find_first_match(self):
self.assertRaises(ValueError,
iter_utils.find_first_match, 2, lambda v: False)
def test_find_first_match(self):
it = forever_it()
self.assertEqual(100, iter_utils.find_first_match(it,
lambda v: v == 100))
def test_find_first_match_not_found(self):
it = iter(string.ascii_lowercase)
self.assertIsNone(iter_utils.find_first_match(it,
lambda v: v == ''))
def test_bad_count(self):
self.assertRaises(ValueError, iter_utils.count, 2)
def test_count(self):
self.assertEqual(0, iter_utils.count([]))
self.assertEqual(1, iter_utils.count(['a']))
self.assertEqual(10, iter_utils.count(range(0, 10)))
self.assertEqual(1000, iter_utils.count(range(0, 1000)))
self.assertEqual(0, iter_utils.count(range(0)))
self.assertEqual(0, iter_utils.count(range(-1)))
def test_bad_while_is_not(self):
self.assertRaises(ValueError, iter_utils.while_is_not, 2, 'a')
def test_while_is_not(self):
it = iter(string.ascii_lowercase)
self.assertEqual(['a'],
list(iter_utils.while_is_not(it, 'a')))
it = iter(string.ascii_lowercase)
self.assertEqual(['a', 'b'],
list(iter_utils.while_is_not(it, 'b')))
self.assertEqual(list(string.ascii_lowercase[2:]),
list(iter_utils.while_is_not(it, 'zzz')))
it = iter(string.ascii_lowercase)
self.assertEqual(list(string.ascii_lowercase),
list(iter_utils.while_is_not(it, '')))
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