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|
Restricted Plugin Managers
--------------------------
In some cases, such as running under the ``python setup.py test`` command,
nose is not able to use all available plugins. In those cases, a
`nose.plugins.manager.RestrictedPluginManager` is used to exclude plugins that
implement API methods that nose is unable to call.
Support files for this test are in the support directory.
>>> import os
>>> support = os.path.join(os.path.dirname(__file__), 'support')
For this test, we'll use a simple plugin that implements the ``startTest``
method.
>>> from nose.plugins.base import Plugin
>>> from nose.plugins.manager import RestrictedPluginManager
>>> class StartPlugin(Plugin):
... def startTest(self, test):
... print "started %s" % test
.. Note ::
The run() function in :mod:`nose.plugins.plugintest` reformats test result
output to remove timings, which will vary from run to run, and
redirects the output to stdout.
>>> from nose.plugins.plugintest import run_buffered as run
..
When run with a normal plugin manager, the plugin executes.
>>> argv = ['plugintest', '-v', '--with-startplugin', support]
>>> run(argv=argv, plugins=[StartPlugin()]) # doctest: +REPORT_NDIFF
started test.test
test.test ... ok
<BLANKLINE>
----------------------------------------------------------------------
Ran 1 test in ...s
<BLANKLINE>
OK
However, when run with a restricted plugin manager configured to exclude
plugins implementing `startTest`, an exception is raised and nose exits.
>>> restricted = RestrictedPluginManager(
... plugins=[StartPlugin()], exclude=('startTest',), load=False)
>>> run(argv=argv, plugins=restricted) #doctest: +REPORT_NDIFF +ELLIPSIS
Traceback (most recent call last):
...
SystemExit: 2
Errors are only raised when options defined by excluded plugins are used.
>>> argv = ['plugintest', '-v', support]
>>> run(argv=argv, plugins=restricted) # doctest: +REPORT_NDIFF
test.test ... ok
<BLANKLINE>
----------------------------------------------------------------------
Ran 1 test in ...s
<BLANKLINE>
OK
When a disabled option appears in a configuration file, instead of on the
command line, a warning is raised instead of an exception.
>>> argv = ['plugintest', '-v', '-c', os.path.join(support, 'start.cfg'),
... support]
>>> run(argv=argv, plugins=restricted) # doctest: +ELLIPSIS
RuntimeWarning: Option 'with-startplugin' in config file '...start.cfg' ignored: excluded by runtime environment
test.test ... ok
<BLANKLINE>
----------------------------------------------------------------------
Ran 1 test in ...s
<BLANKLINE>
OK
However, if an option appears in a configuration file that is not recognized
either as an option defined by nose, or by an active or excluded plugin, an
error is raised.
>>> argv = ['plugintest', '-v', '-c', os.path.join(support, 'bad.cfg'),
... support]
>>> run(argv=argv, plugins=restricted) # doctest: +ELLIPSIS
Traceback (most recent call last):
...
SystemExit: 2
|
