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# Copyright The OpenTelemetry Authors
#
# 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 unittest
from opentelemetry.sdk.util import BoundedList
# pylint: disable=unsubscriptable-object
class TestBoundedList(unittest.TestCase):
base = [52, 36, 53, 29, 54, 99, 56, 48, 22, 35, 21, 65, 10, 95, 42, 60]
def test_raises(self):
"""Test corner cases
- negative list size
- access out of range indexes
"""
with self.assertRaises(ValueError):
BoundedList(-1)
blist = BoundedList(4)
blist.append(37)
blist.append(13)
with self.assertRaises(IndexError):
_ = blist[2]
with self.assertRaises(IndexError):
_ = blist[4]
with self.assertRaises(IndexError):
_ = blist[-3]
def test_from_seq(self):
list_len = len(self.base)
base_copy = list(self.base)
blist = BoundedList.from_seq(list_len, base_copy)
self.assertEqual(len(blist), list_len)
# modify base_copy and test that blist is not changed
for idx in range(list_len):
base_copy[idx] = idx * base_copy[idx]
for idx in range(list_len):
self.assertEqual(blist[idx], self.base[idx])
# test that iter yields the correct number of elements
self.assertEqual(len(tuple(blist)), list_len)
# sequence too big
blist = BoundedList.from_seq(list_len // 2, base_copy)
self.assertEqual(len(blist), list_len // 2)
self.assertEqual(blist.dropped, list_len - (list_len // 2))
def test_append_no_drop(self):
"""Append max capacity elements to the list without dropping elements."""
# create empty list
list_len = len(self.base)
blist = BoundedList(list_len)
self.assertEqual(len(blist), 0)
# fill list
for item in self.base:
blist.append(item)
self.assertEqual(len(blist), list_len)
self.assertEqual(blist.dropped, 0)
for idx in range(list_len):
self.assertEqual(blist[idx], self.base[idx])
# test __iter__ in BoundedList
for idx, val in enumerate(blist):
self.assertEqual(val, self.base[idx])
def test_append_drop(self):
"""Append more than max capacity elements and test that oldest ones are dropped."""
list_len = len(self.base)
# create full BoundedList
blist = BoundedList.from_seq(list_len, self.base)
# try to append more items
for val in self.base:
# should drop the element without raising exceptions
blist.append(2 * val)
self.assertEqual(len(blist), list_len)
self.assertEqual(blist.dropped, list_len)
# test that new elements are in the list
for idx in range(list_len):
self.assertEqual(blist[idx], 2 * self.base[idx])
def test_extend_no_drop(self):
# create empty list
list_len = len(self.base)
blist = BoundedList(list_len)
self.assertEqual(len(blist), 0)
# fill list
blist.extend(self.base)
self.assertEqual(len(blist), list_len)
self.assertEqual(blist.dropped, 0)
for idx in range(list_len):
self.assertEqual(blist[idx], self.base[idx])
# test __iter__ in BoundedList
for idx, val in enumerate(blist):
self.assertEqual(val, self.base[idx])
def test_extend_drop(self):
list_len = len(self.base)
# create full BoundedList
blist = BoundedList.from_seq(list_len, self.base)
other_list = [13, 37, 51, 91]
# try to extend with more elements
blist.extend(other_list)
self.assertEqual(len(blist), list_len)
self.assertEqual(blist.dropped, len(other_list))
def test_no_limit(self):
blist = BoundedList(maxlen=None)
for num in range(100):
blist.append(num)
for num in range(100):
self.assertEqual(blist[num], num)
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