1 #! /usr/bin/env python

     2 """Basic tests for os.popen()

     3 

     4   Particularly useful for platforms that fake popen.

     5 """

     6 

     7 import os

     8 import sys

     9 from test.test_support import TestSkipped, reap_children

    10 from os import popen

    11 

    12 # Test that command-lines get down as we expect.

    13 # To do this we execute:

    14 #    python -c "import sys;print sys.argv" {rest_of_commandline}

    15 # This results in Python being spawned and printing the sys.argv list.

    16 # We can then eval() the result of this, and see what each argv was.

    17 python = sys.executable

    18 if ' ' in python:

    19     python = '"' + python + '"'     # quote embedded space for cmdline

    20 def _do_test_commandline(cmdline, expected):

    21     cmd = '%s -c "import sys;print sys.argv" %s' % (python, cmdline)

    22     data = popen(cmd).read()

    23     got = eval(data)[1:] # strip off argv[0]

    24     if got != expected:

    25         print "Error in popen commandline handling."

    26         print " executed '%s', expected '%r', but got '%r'" \

    27                                                     % (cmdline, expected, got)

    28 

    29 def _test_commandline():

    30     _do_test_commandline("foo bar", ["foo", "bar"])

    31     _do_test_commandline('foo "spam and eggs" "silly walk"', ["foo", "spam and eggs", "silly walk"])

    32     _do_test_commandline('foo "a \\"quoted\\" arg" bar', ["foo", 'a "quoted" arg', "bar"])

    33     print "popen seemed to process the command-line correctly"

    34 

    35 def main():

    36     print "Test popen:"

    37     _test_commandline()

    38     reap_children()

    39 

    40 main()