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Mocks for subprocess commands

Project description

MockProcess is a mock for the subprocess module to be used in your unit tests. Right now it only supports the check_output method, but eventually popen will be supported as well.

It is used via a context manager. Here’s a basic example

>>> import subprocess
>>> import unittest
>>> from mockprocess import MockCheckOutput
>>> class Test(unittest.TestCase):
...     def test_simple(self):
...         with MockCheckOutput('hello\n'):
...             output = subprocess.check_output(['/bin/echo', 'hello'])
...         self.assertEqual(output, 'hello\n')
...

If you need to test how you handle errors, you can set an exit code as well.

>>> import subprocess
>>> import unittest
>>> from mockprocess import MockCheckoutput
>>> class Test(unittest.TestCase):
...     def test_exception(self):
...         try:
...             with MockCheckOutput('hello\n', exit_code=127):
...                 subprocess.check_output(['/bin/false'])
...         except subprocess.CalledProcessError as exp:
...             pass
...         else:
...             self.fail('exception was not raised')

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