test_popen.py revision 9175742ef001079ef20bb8d77f4bc319e3cf13b7 
1#! /usr/bin/env python
2"""Basic tests for os.popen()
3
4  Particularly useful for platforms that fake popen.
5"""
6
7import unittest
8from test import test_support
9import os, sys
10
11# Test that command-lines get down as we expect.
12# To do this we execute:
13#    python -c "import sys;print sys.argv" {rest_of_commandline}
14# This results in Python being spawned and printing the sys.argv list.
15# We can then eval() the result of this, and see what each argv was.
16python = sys.executable
17if ' ' in python:
18    python = '"' + python + '"'     # quote embedded space for cmdline
19
20class PopenTest(unittest.TestCase):
21    def _do_test_commandline(self, cmdline, expected):
22        cmd = '%s -c "import sys;print sys.argv" %s' % (python, cmdline)
23        data = os.popen(cmd).read()
24        got = eval(data)[1:] # strip off argv[0]
25        self.assertEqual(got, expected)
26
27    def test_popen(self):
28        self.assertRaises(TypeError, os.popen)
29        self._do_test_commandline(
30            "foo bar",
31            ["foo", "bar"]
32        )
33        self._do_test_commandline(
34            'foo "spam and eggs" "silly walk"',
35            ["foo", "spam and eggs", "silly walk"]
36        )
37        self._do_test_commandline(
38            'foo "a \\"quoted\\" arg" bar',
39            ["foo", 'a "quoted" arg', "bar"]
40        )
41        test_support.reap_children()
42
43    def test_return_code(self):
44        self.assertEqual(os.popen("exit 0").close(), None)
45        if os.name == 'nt':
46            self.assertEqual(os.popen("exit 42").close(), 42)
47        else:
48            self.assertEqual(os.popen("exit 42").close(), 42 << 8)
49
50def test_main():
51    test_support.run_unittest(PopenTest)
52
53if __name__ == "__main__":
54    test_main()
55