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✏️ test_popen.py

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"""Basic tests for os.popen()

Particularly useful for platforms that fake popen.
"""

import unittest
from test import test_support
import os, sys

# 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.
python = sys.executable

class PopenTest(unittest.TestCase):
    def _do_test_commandline(self, cmdline, expected):
        cmd = '%s -c "import sys;print sys.argv" %s' % (python, cmdline)
        data = os.popen(cmd).read() + '\n'
        got = eval(data)[1:] # strip off argv[0]
        self.assertEqual(got, expected)

def test_popen(self):
        self.assertRaises(TypeError, os.popen)
        self._do_test_commandline(
            "foo bar",
            ["foo", "bar"]
        )
        self._do_test_commandline(
            'foo "spam and eggs" "silly walk"',
            ["foo", "spam and eggs", "silly walk"]
        )
        self._do_test_commandline(
            'foo "a \\"quoted\\" arg" bar',
            ["foo", 'a "quoted" arg', "bar"]
        )
        test_support.reap_children()

def test_return_code(self):
        self.assertEqual(os.popen("exit 0").close(), None)
        if os.name == 'nt':
            self.assertEqual(os.popen("exit 42").close(), 42)
        else:
            self.assertEqual(os.popen("exit 42").close(), 42 << 8)

def test_main():
    test_support.run_unittest(PopenTest)

if __name__ == "__main__":
    test_main()

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✏️ test_popen.py