unit test for testing argument parsing in nose plugin

[ali]

Hi, 

I'm trying to write some unit tests to validate the arguments that a plugin should / shouldn't accept. As an example I have the following:

import nose.plugins

import unittest

class SimplePlugin(nose.plugins.Plugin):

    name = "simple-plugin"

    def options(self, parser, env):

        super(SimplePlugin, self).options(parser, env)

        parser.add_option("--some-number", dest="number", type = "choice", choices=[1,2,3])

class TestSimplePlugin(nose.plugins.PluginTester,unittest.TestCase):

    activate = "--with-simple-plugin"

    plugins = [ SimplePlugin() ]

    args = ["--some-number=10"]

    def test(self):

        pass

    def makeSuite(self):

        class TC(unittest.TestCase):

            def runTest(self):

                pass

When the above is run, the argument passing does indeed raise an error, but I'm not sure what the correct way to capture these errors and assert on them is.

thanks,

./A