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from __future__ import unicode_literals

import os

import os.path

import random

import pytest

from pre_commit.util import clean_path_on_failure

from pre_commit.util import cwd

from pre_commit.util import memoize_by_cwd

from pre_commit.util import tmpdir

@pytest.fixture

def memoized_by_cwd():

@memoize_by_cwd

def func(arg):

return arg + str(random.getrandbits(64))

return func

def test_memoized_by_cwd_returns_same_twice_in_a_row(memoized_by_cwd):

ret = memoized_by_cwd('baz')

ret2 = memoized_by_cwd('baz')

assert ret is ret2

def test_memoized_by_cwd_returns_different_for_different_args(memoized_by_cwd):

ret = memoized_by_cwd('baz')

ret2 = memoized_by_cwd('bar')

assert ret.startswith('baz')

assert ret2.startswith('bar')

assert ret != ret2

def test_memoized_by_cwd_changes_with_different_cwd(memoized_by_cwd):

ret = memoized_by_cwd('baz')

with cwd('.git'):

ret2 = memoized_by_cwd('baz')

assert ret != ret2

def test_clean_on_failure_noop(in_tmpdir):

with clean_path_on_failure('foo'):

pass

def test_clean_path_on_failure_does_nothing_when_not_raising(in_tmpdir):

with clean_path_on_failure('foo'):

os.mkdir('foo')

assert os.path.exists('foo')

def test_clean_path_on_failure_cleans_for_normal_exception(in_tmpdir):

class MyException(Exception):

pass

with pytest.raises(MyException):

with clean_path_on_failure('foo'):

os.mkdir('foo')

raise MyException

assert not os.path.exists('foo')

def test_clean_path_on_failure_cleans_for_system_exit(in_tmpdir):

class MySystemExit(SystemExit):

pass

with pytest.raises(MySystemExit):

with clean_path_on_failure('foo'):

os.mkdir('foo')

raise MySystemExit

assert not os.path.exists('foo')

def test_tmpdir():

with tmpdir() as tempdir:

assert os.path.exists(tempdir)

assert not os.path.exists(tempdir)

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