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test_popen.py
"""Basic tests for os.popen() Particularly useful for platforms that fake popen. """ import unittest from test import 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 if ' ' in python: python = '"' + python + '"' # quote embedded space for cmdline 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) if os.name == 'nt': self.assertEqual(os.popen("exit 42").close(), 42) else: self.assertEqual(os.popen("exit 42").close(), 42 << 8) 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()