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"""Basic tests for os.popen()
Particularly useful for platforms that fake popen.
"""
import unittest
from test import support
import os, sys
if not hasattr(os, 'popen'):
raise unittest.SkipTest("need os.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.
python = sys.executable
if ' ' in python:
python = '"' + python + '"' # quote embedded space for cmdline
@support.requires_subprocess()
class PopenTest(unittest.TestCase):
def _do_test_commandline(self, cmdline, expected):
cmd = '%s -c "import sys; print(sys.argv)" %s'
cmd = cmd % (python, cmdline)
with os.popen(cmd) as p:
data = p.read()
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"]
)
support.reap_children()
def test_return_code(self):
self.assertEqual(os.popen("exit 0").close(), None)
status = os.popen("exit 42").close()
if os.name == 'nt':
self.assertEqual(status, 42)
else:
self.assertEqual(os.waitstatus_to_exitcode(status), 42)
def test_contextmanager(self):
with os.popen("echo hello") as f:
self.assertEqual(f.read(), "hello\n")
def test_iterating(self):
with os.popen("echo hello") as f:
self.assertEqual(list(f), ["hello\n"])
def test_keywords(self):
with os.popen(cmd="exit 0", mode="w", buffering=-1):
pass
if __name__ == "__main__":
unittest.main()
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