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#
# Copyright 2015 Google Inc.
#
# 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.
"""Tests for stream_slice."""
import string
import unittest
import six
from apitools.base.py import exceptions
from apitools.base.py import stream_slice
class StreamSliceTest(unittest.TestCase):
def setUp(self):
self.stream = six.StringIO(string.ascii_letters)
self.value = self.stream.getvalue()
self.stream.seek(0)
def testSimpleSlice(self):
ss = stream_slice.StreamSlice(self.stream, 10)
self.assertEqual('', ss.read(0))
self.assertEqual(self.value[0:3], ss.read(3))
self.assertIn('7/10', str(ss))
self.assertEqual(self.value[3:10], ss.read())
self.assertEqual('', ss.read())
self.assertEqual('', ss.read(10))
self.assertEqual(10, self.stream.tell())
def testEmptySlice(self):
ss = stream_slice.StreamSlice(self.stream, 0)
self.assertEqual('', ss.read(5))
self.assertEqual('', ss.read())
self.assertEqual(0, self.stream.tell())
def testOffsetStream(self):
self.stream.seek(26)
ss = stream_slice.StreamSlice(self.stream, 26)
self.assertEqual(self.value[26:36], ss.read(10))
self.assertEqual(self.value[36:], ss.read())
self.assertEqual('', ss.read())
def testTooShortStream(self):
ss = stream_slice.StreamSlice(self.stream, 1000)
self.assertEqual(self.value, ss.read())
self.assertEqual('', ss.read(0))
with self.assertRaises(exceptions.StreamExhausted) as e:
ss.read()
with self.assertRaises(exceptions.StreamExhausted) as e:
ss.read(10)
self.assertIn('exhausted after %d' % len(self.value), str(e.exception))