Lib/test/test_popen.py

   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
  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
  39 main()