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"""Test script for popen2.py"""
import warnings
warnings.filterwarnings("ignore", ".*popen2 module is deprecated.*",
DeprecationWarning)
warnings.filterwarnings("ignore", "os\.popen. is deprecated.*",
DeprecationWarning)
import os
import sys
import unittest
import popen2
from test.test_support import run_unittest, reap_children
if sys.platform[:4] == 'beos' or sys.platform[:6] == 'atheos':
# Locks get messed up or something. Generally we're supposed
# to avoid mixing "posix" fork & exec with native threads, and
# they may be right about that after all.
raise unittest.SkipTest("popen2() doesn't work on " + sys.platform)
# if we don't have os.popen, check that
# we have os.fork. if not, skip the test
# (by raising an ImportError)
try:
from os import popen
del popen
except ImportError:
from os import fork
del fork
class Popen2Test(unittest.TestCase):
cmd = "cat"
if os.name == "nt":
cmd = "more"
teststr = "ab cd\n"
# "more" doesn't act the same way across Windows flavors,
# sometimes adding an extra newline at the start or the
# end. So we strip whitespace off both ends for comparison.
expected = teststr.strip()
def setUp(self):
popen2._cleanup()
# When the test runs, there shouldn't be any open pipes
self.assertFalse(popen2._active, "Active pipes when test starts" +
repr([c.cmd for c in popen2._active]))
def tearDown(self):
for inst in popen2._active:
inst.wait()
popen2._cleanup()
self.assertFalse(popen2._active, "popen2._active not empty")
# The os.popen*() API delegates to the subprocess module (on Unix)
import subprocess
for inst in subprocess._active:
inst.wait()
subprocess._cleanup()
self.assertFalse(subprocess._active, "subprocess._active not empty")
reap_children()
def validate_output(self, teststr, expected_out, r, w, e=None):
w.write(teststr)
w.close()
got = r.read()
self.assertEqual(expected_out, got.strip(), "wrote %r read %r" %
(teststr, got))
if e is not None:
got = e.read()
self.assertFalse(got, "unexpected %r on stderr" % got)
def test_popen2(self):
r, w = popen2.popen2(self.cmd)
self.validate_output(self.teststr, self.expected, r, w)
def test_popen3(self):
if os.name == 'posix':
r, w, e = popen2.popen3([self.cmd])
self.validate_output(self.teststr, self.expected, r, w, e)
r, w, e = popen2.popen3(self.cmd)
self.validate_output(self.teststr, self.expected, r, w, e)
def test_os_popen2(self):
# same test as test_popen2(), but using the os.popen*() API
if os.name == 'posix':
w, r = os.popen2([self.cmd])
self.validate_output(self.teststr, self.expected, r, w)
w, r = os.popen2(["echo", self.teststr])
got = r.read()
self.assertEqual(got, self.teststr + "\n")
w, r = os.popen2(self.cmd)
self.validate_output(self.teststr, self.expected, r, w)
def test_os_popen3(self):
# same test as test_popen3(), but using the os.popen*() API
if os.name == 'posix':
w, r, e = os.popen3([self.cmd])
self.validate_output(self.teststr, self.expected, r, w, e)
w, r, e = os.popen3(["echo", self.teststr])
got = r.read()
self.assertEqual(got, self.teststr + "\n")
got = e.read()
self.assertFalse(got, "unexpected %r on stderr" % got)
w, r, e = os.popen3(self.cmd)
self.validate_output(self.teststr, self.expected, r, w, e)
def test_os_popen4(self):
if os.name == 'posix':
w, r = os.popen4([self.cmd])
self.validate_output(self.teststr, self.expected, r, w)
w, r = os.popen4(["echo", self.teststr])
got = r.read()
self.assertEqual(got, self.teststr + "\n")
w, r = os.popen4(self.cmd)
self.validate_output(self.teststr, self.expected, r, w)
def test_main():
run_unittest(Popen2Test)
if __name__ == "__main__":
test_main()
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