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Copy pathtest_atomic.py
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53 lines (46 loc) · 1.54 KB
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# Copyright 2015 Planet Labs, 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.
import os
from planet.api._fatomic import atomic_open
def test_atomic_open(tmpdir):
outfile = str(tmpdir.join('foo'))
def lsdir():
return os.listdir(str(tmpdir))
def assert_content_is(expected):
with open(outfile, 'r') as fp:
assert fp.read() == expected
# success case
with atomic_open(outfile, 'w') as fp:
fp.write('bar')
assert_content_is('bar')
# no tmp files remain
assert ['foo'] == lsdir()
# exception during write, assert file remains untouched
try:
with atomic_open(outfile, 'w') as fp:
fp.write('bazzy')
raise Exception('drat')
except Exception:
assert_content_is('bar')
else:
assert False
# no tmp files remain
assert ['foo'] == lsdir()
# manual discarding
with atomic_open(outfile, 'w') as fp:
fp.write('bazzy')
fp.discard()
assert_content_is('bar')
# no tmp files remain
assert ['foo'] == lsdir()