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# Copyright 2012 Canonical Ltd. This software is licensed under the
# GNU Affero General Public License version 3 (see the file LICENSE).
from subprocess import CalledProcessError
import unittest
from helpers import command
class TestCommand(unittest.TestCase):
def test_simple_command(self):
# Creating a simple command (ls) works and running the command
# produces a string.
ls = command('/bin/ls')
self.assertIsInstance(ls(), str)
def test_arguments(self):
# Arguments can be passed to commands.
ls = command('/bin/ls')
self.assertIn('Usage:', ls('--help'))
def test_missing_executable(self):
# If the command does not exist, an OSError (No such file or
# directory) is raised.
bad = command('this command does not exist')
with self.assertRaises(OSError) as info:
bad()
self.assertEqual(2, info.exception.errno)
def test_error(self):
# If the command returns a non-zero exit code, an exception is raised.
ls = command('/bin/ls')
with self.assertRaises(CalledProcessError):
ls('--not a valid switch')
def test_baked_in_arguments(self):
# Arguments can be passed when creating the command as well as when
# executing it.
ll = command('/bin/ls', '-l')
self.assertIn('rw', ll()) # Assumes a file is r/w in the pwd.
self.assertIn('Usage:', ll('--help'))
def test_quoting(self):
# There is no need to quote special shell characters in commands.
ls = command('/bin/ls')
ls('--help', '>')
if __name__ == '__main__':
unittest.main()
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