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#! /usr/bin/env python
"""Basic tests for os.popen()
Particularly useful for platforms that fake popen.
"""
import os
import sys
from test_support import TestSkipped
from os import popen
# Test that command-lines get down as we expect.
# To do this we execute:
# python -c "import sys;print sys.argv" {rest_of_commandline}
# This results in Python being spawned and printing the sys.argv list.
# We can then eval() the result of this, and see what each argv was.
def _do_test_commandline(cmdline, expected):
cmd = '%s -c "import sys;print sys.argv" %s' % (sys.executable, cmdline)
data = popen(cmd).read()
got = eval(data)[1:] # strip off argv[0]
if got != expected:
print "Error in popen commandline handling."
print " executed '%s', expected '%r', but got '%r'" \
% (cmdline, expected, got)
def _test_commandline():
_do_test_commandline("foo bar", ["foo", "bar"])
_do_test_commandline('foo "spam and eggs" "silly walk"', ["foo", "spam and eggs", "silly walk"])
_do_test_commandline('foo "a \\"quoted\\" arg" bar', ["foo", 'a "quoted" arg', "bar"])
print "popen seemed to process the command-line correctly"
def main():
print "Test popen:"
_test_commandline()
main()
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