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"""Tests for scandir.walk(), copied from CPython's tests for os.walk()."""
import os
import shutil
import sys
import unittest
import scandir
walk_func = scandir.walk
IS_PY3 = sys.version_info >= (3, 0)
class TestWalk(unittest.TestCase):
testfn = os.path.join(os.path.dirname(__file__), 'temp')
def test_traversal(self):
# Build:
# TESTFN/
# TEST1/ a file kid and two directory kids
# tmp1
# SUB1/ a file kid and a directory kid
# tmp2
# SUB11/ no kids
# SUB2/ a file kid and a dirsymlink kid
# tmp3
# link/ a symlink to TESTFN.2
# TEST2/
# tmp4 a lone file
walk_path = os.path.join(self.testfn, "TEST1")
sub1_path = os.path.join(walk_path, "SUB1")
sub11_path = os.path.join(sub1_path, "SUB11")
sub2_path = os.path.join(walk_path, "SUB2")
tmp1_path = os.path.join(walk_path, "tmp1")
tmp2_path = os.path.join(sub1_path, "tmp2")
tmp3_path = os.path.join(sub2_path, "tmp3")
link_path = os.path.join(sub2_path, "link")
t2_path = os.path.join(self.testfn, "TEST2")
tmp4_path = os.path.join(self.testfn, "TEST2", "tmp4")
# Create stuff.
os.makedirs(sub11_path)
os.makedirs(sub2_path)
os.makedirs(t2_path)
for path in tmp1_path, tmp2_path, tmp3_path, tmp4_path:
f = open(path, "w")
f.write("I'm " + path + " and proud of it. Blame test_os.\n")
f.close()
has_symlink = hasattr(os, "symlink")
if has_symlink:
try:
if IS_PY3:
os.symlink(os.path.abspath(t2_path), link_path, target_is_directory=True)
else:
os.symlink(os.path.abspath(t2_path), link_path)
sub2_tree = (sub2_path, ["link"], ["tmp3"])
except NotImplementedError:
sub2_tree = (sub2_path, [], ["tmp3"])
else:
sub2_tree = (sub2_path, [], ["tmp3"])
# Walk top-down.
all = list(walk_func(walk_path))
self.assertEqual(len(all), 4)
# We can't know which order SUB1 and SUB2 will appear in.
# Not flipped: TESTFN, SUB1, SUB11, SUB2
# flipped: TESTFN, SUB2, SUB1, SUB11
flipped = all[0][1][0] != "SUB1"
all[0][1].sort()
self.assertEqual(all[0], (walk_path, ["SUB1", "SUB2"], ["tmp1"]))
self.assertEqual(all[1 + flipped], (sub1_path, ["SUB11"], ["tmp2"]))
self.assertEqual(all[2 + flipped], (sub11_path, [], []))
self.assertEqual(all[3 - 2 * flipped], sub2_tree)
# Prune the search.
all = []
for root, dirs, files in walk_func(walk_path):
all.append((root, dirs, files))
# Don't descend into SUB1.
if 'SUB1' in dirs:
# Note that this also mutates the dirs we appended to all!
dirs.remove('SUB1')
self.assertEqual(len(all), 2)
self.assertEqual(all[0], (walk_path, ["SUB2"], ["tmp1"]))
self.assertEqual(all[1], sub2_tree)
# Walk bottom-up.
all = list(walk_func(walk_path, topdown=False))
self.assertEqual(len(all), 4)
# We can't know which order SUB1 and SUB2 will appear in.
# Not flipped: SUB11, SUB1, SUB2, TESTFN
# flipped: SUB2, SUB11, SUB1, TESTFN
flipped = all[3][1][0] != "SUB1"
all[3][1].sort()
self.assertEqual(all[3], (walk_path, ["SUB1", "SUB2"], ["tmp1"]))
self.assertEqual(all[flipped], (sub11_path, [], []))
self.assertEqual(all[flipped + 1], (sub1_path, ["SUB11"], ["tmp2"]))
self.assertEqual(all[2 - 2 * flipped], sub2_tree)
if has_symlink:
# Walk, following symlinks.
for root, dirs, files in walk_func(walk_path, followlinks=True):
if root == link_path:
self.assertEqual(dirs, [])
self.assertEqual(files, ["tmp4"])
break
else:
self.fail("Didn't follow symlink with followlinks=True")
# Test creating a directory and adding it to dirnames
sub3_path = os.path.join(walk_path, "SUB3")
all = []
for root, dirs, files in walk_func(walk_path):
all.append((root, dirs, files))
if 'SUB1' in dirs:
os.makedirs(sub3_path)
dirs.append('SUB3')
all.sort()
self.assertEqual(os.path.split(all[-1][0])[1], 'SUB3')
def tearDown(self):
# Tear everything down. This is a decent use for bottom-up on
# Windows, which doesn't have a recursive delete command. The
# (not so) subtlety is that rmdir will fail unless the dir's
# kids are removed first, so bottom up is essential.
for root, dirs, files in os.walk(self.testfn, topdown=False):
for name in files:
os.remove(os.path.join(root, name))
for name in dirs:
dirname = os.path.join(root, name)
if not os.path.islink(dirname):
os.rmdir(dirname)
else:
os.remove(dirname)
os.rmdir(self.testfn)
class TestWalkSymlink(unittest.TestCase):
temp_dir = os.path.join(os.path.dirname(__file__), 'temp')
def setUp(self):
os.mkdir(self.temp_dir)
self.dir_name = os.path.join(self.temp_dir, 'dir')
os.mkdir(self.dir_name)
open(os.path.join(self.dir_name, 'subfile'), 'w').close()
self.file_name = os.path.join(self.temp_dir, 'file')
open(self.file_name, 'w').close()
def tearDown(self):
shutil.rmtree(self.temp_dir)
def test_symlink_to_file(self):
if not hasattr(os, 'symlink'):
return
try:
os.symlink(self.file_name, os.path.join(self.temp_dir,
'link_to_file'))
except NotImplementedError:
# Windows versions before Vista don't support symbolic links
return
output = sorted(walk_func(self.temp_dir))
dirs = sorted(output[0][1])
files = sorted(output[0][2])
self.assertEqual(dirs, ['dir'])
self.assertEqual(files, ['file', 'link_to_file'])
self.assertEqual(len(output), 2)
self.assertEqual(output[1][1], [])
self.assertEqual(output[1][2], ['subfile'])
def test_symlink_to_directory(self):
if not hasattr(os, 'symlink'):
return
link_name = os.path.join(self.temp_dir, 'link_to_dir')
try:
if IS_PY3:
os.symlink(self.dir_name, link_name, target_is_directory=True)
else:
os.symlink(self.dir_name, link_name)
except NotImplementedError:
# Windows versions before Vista don't support symbolic links
return
output = sorted(walk_func(self.temp_dir))
dirs = sorted(output[0][1])
files = sorted(output[0][2])
self.assertEqual(dirs, ['dir', 'link_to_dir'])
self.assertEqual(files, ['file'])
self.assertEqual(len(output), 2)
self.assertEqual(output[1][1], [])
self.assertEqual(output[1][2], ['subfile'])
output = sorted(walk_func(self.temp_dir, followlinks=True))
dirs = sorted(output[0][1])
files = sorted(output[0][2])
self.assertEqual(dirs, ['dir', 'link_to_dir'])
self.assertEqual(files, ['file'])
self.assertEqual(len(output), 3)
self.assertEqual(output[1][1], [])
self.assertEqual(output[1][2], ['subfile'])
self.assertEqual(os.path.basename(output[2][0]), 'link_to_dir')
self.assertEqual(output[2][1], [])
self.assertEqual(output[2][2], ['subfile'])
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