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#! /usr/bin/env python
"""Test script for popen2.py
Christian Tismer
"""
import os
import sys
from test.test_support import TestSkipped, reap_children
# popen2 contains its own testing routine
# which is especially useful to see if open files
# like stdin can be read successfully by a forked
# subprocess.
def main():
print("Test popen2 module:")
if (sys.platform[:4] == 'beos' or sys.platform[:6] == 'atheos') \
and __name__ != '__main__':
# 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 TestSkipped, "popen2() doesn't work during import on " + sys.platform
try:
from os import popen
except ImportError:
# if we don't have os.popen, check that
# we have os.fork. if not, skip the test
# (by raising an ImportError)
from os import fork
import popen2
popen2._test()
def _test():
# same test as popen2._test(), but using the os.popen*() API
print("Testing os module:")
import popen2
# When the test runs, there shouldn't be any open pipes
popen2._cleanup()
assert not popen2._active, "Active pipes when test starts " + repr([c.cmd for c in popen2._active])
cmd = "cat"
teststr = "ab cd\n"
if os.name == "nt":
cmd = "more"
# "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()
print("testing popen2...")
w, r = os.popen2(cmd)
w.write(teststr)
w.close()
got = r.read()
if got.strip() != expected:
raise ValueError("wrote %r read %r" % (teststr, got))
print("testing popen3...")
try:
w, r, e = os.popen3([cmd])
except:
w, r, e = os.popen3(cmd)
w.write(teststr)
w.close()
got = r.read()
if got.strip() != expected:
raise ValueError("wrote %r read %r" % (teststr, got))
got = e.read()
if got:
raise ValueError("unexpected %r on stderr" % (got,))
for inst in popen2._active[:]:
inst.wait()
popen2._cleanup()
if popen2._active:
raise ValueError("_active not empty")
print("All OK")
main()
_test()
reap_children()
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