Sandbox::https://github.com/amanda/bpython/blob/master/bpython/test/test

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import subprocess

import sys

import tempfile

from textwrap import dedent

try:

import unittest2 as unittest

except ImportError:

import unittest

class TestExecArgs(unittest.TestCase):

def test_exec_dunder_file(self):

with tempfile.NamedTemporaryFile(mode="w") as f:

f.write(dedent("""\

import sys

sys.stderr.write(__file__)

sys.stderr.flush()"""))

f.flush()

p = subprocess.Popen(

[sys.executable, "-m", "bpython.curtsies", f.name],

stderr=subprocess.PIPE,

universal_newlines=True)

(_, stderr) = p.communicate()

self.assertEquals(stderr.strip(), f.name)