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This plugin adds a test id (like #1) to each test name output. After
you've run once to generate test ids, you can re-run individual
tests by activating the plugin and passing the ids (with or
without the # prefix) instead of test names.
For example, if your normal test run looks like::
% nosetests -v
tests.test_a ... ok
tests.test_b ... ok
tests.test_c ... ok
When adding ``--with-id`` you'll see::
% nosetests -v --with-id
#1 tests.test_a ... ok
#2 tests.test_b ... ok
#3 tests.test_c ... ok
Then you can re-run individual tests by supplying just an id number::
% nosetests -v --with-id 2
#2 tests.test_b ... ok
You can also pass multiple id numbers::
% nosetests -v --with-id 2 3
#2 tests.test_b ... ok
#3 tests.test_c ... ok
Since most shells consider '#' a special character, you can leave it out when
specifying a test id.
Note that when run without the -v switch, no special output is displayed, but
the ids file is still written.
Looping over failed tests
This plugin also adds a mode that will direct the test runner to record
failed tests. Subsequent test runs will then run only the tests that failed
last time. Activate this mode with the ``--failed`` switch::
% nosetests -v --failed
#1 test.test_a ... ok
#2 test.test_b ... ERROR
#3 test.test_c ... FAILED
#4 test.test_d ... ok
On the second run, only tests #2 and #3 will run::
% nosetests -v --failed
#2 test.test_b ... ERROR
#3 test.test_c ... FAILED
As you correct errors and tests pass, they'll drop out of subsequent runs.
% nosetests -v --failed
#2 test.test_b ... ok
#3 test.test_c ... FAILED
% nosetests -v --failed
#3 test.test_c ... FAILED
When all tests pass, the full set will run on the next invocation.
% nosetests -v --failed
#3 test.test_c ... ok
% nosetests -v --failed
#1 test.test_a ... ok
#2 test.test_b ... ok
#3 test.test_c ... ok
#4 test.test_d ... ok
.. note ::
If you expect to use ``--failed`` regularly, it's a good idea to always run
using the ``--with-id`` option. This will ensure that an id file is always
created, allowing you to add ``--failed`` to the command line as soon as
you have failing tests. Otherwise, your first run using ``--failed`` will
(perhaps surprisingly) run *all* tests, because there won't be an id file
containing the record of failed tests from your previous run.
__test__ = False
import logging
import os
from nose.plugins import Plugin
from nose.util import src, set
from cPickle import dump, load
except ImportError:
from pickle import dump, load
log = logging.getLogger(__name__)
class TestId(Plugin):
Activate to add a test id (like #1) to each test name output. Activate
with --failed to rerun failing tests only.
name = 'id'
idfile = None
collecting = True
loopOnFailed = False
def options(self, parser, env):
"""Register commandline options.
Plugin.options(self, parser, env)
parser.add_option('--id-file', action='store', dest='testIdFile',
default='.noseids', metavar="FILE",
help="Store test ids found in test runs in this "
"file. Default is the file .noseids in the "
"working directory.")
parser.add_option('--failed', action='store_true',
dest='failed', default=False,
help="Run the tests that failed in the last "
"test run.")
def configure(self, options, conf):
"""Configure plugin.
Plugin.configure(self, options, conf)
if options.failed:
self.enabled = True
self.loopOnFailed = True
log.debug("Looping on failed tests")
self.idfile = os.path.expanduser(options.testIdFile)
if not os.path.isabs(self.idfile):
self.idfile = os.path.join(conf.workingDir, self.idfile) = 1
# Ids and tests are mirror images: ids are {id: test address} and
# tests are {test address: id}
self.ids = {}
self.tests = {}
self.failed = []
self.source_names = []
# used to track ids seen when tests is filled from
# loaded ids file
self._seen = {}
self._write_hashes = conf.verbosity >= 2
def finalize(self, result):
"""Save new ids file, if needed.
if result.wasSuccessful():
self.failed = []
if self.collecting:
ids = dict(list(zip(list(self.tests.values()), list(self.tests.keys()))))
ids = self.ids
fh = open(self.idfile, 'wb')
dump({'ids': ids,
'failed': self.failed,
'source_names': self.source_names}, fh)
log.debug('Saved test ids: %s, failed %s to %s',
ids, self.failed, self.idfile)
def loadTestsFromNames(self, names, module=None):
"""Translate ids in the list of requested names into their
test addresses, if they are found in my dict of tests.
log.debug('ltfn %s %s', names, module)
fh = open(self.idfile, 'rb')
data = load(fh)
if 'ids' in data:
self.ids = data['ids']
self.failed = data['failed']
self.source_names = data['source_names']
# old ids field
self.ids = data
self.failed = []
self.source_names = names
if self.ids: = max(self.ids) + 1
self.tests = dict(list(zip(list(self.ids.values()), list(self.ids.keys()))))
else: = 1
'Loaded test ids %s tests %s failed %s sources %s from %s',
self.ids, self.tests, self.failed, self.source_names,
except ValueError, e:
# load() may throw a ValueError when reading the ids file, if it
# was generated with a newer version of Python than we are currently
# running.
log.debug('Error loading %s : %s', self.idfile, str(e))
except IOError:
log.debug('IO error reading %s', self.idfile)
if self.loopOnFailed and self.failed:
self.collecting = False
names = self.failed
self.failed = []
# I don't load any tests myself, only translate names like '#2'
# into the associated test addresses
translated = []
new_source = []
really_new = []
for name in names:
trans =
if trans != name:
# names that are not ids and that are not in the current
# list of source names go into the list for next time
if new_source:
new_set = set(new_source)
old_set = set(self.source_names)
log.debug("old: %s new: %s", old_set, new_set)
really_new = [s for s in new_source
if not s in old_set]
if really_new:
# remember new sources
if not translated:
# new set of source names, no translations
# means "run the requested tests"
names = new_source
# no new names to translate and add to id set
self.collecting = False
log.debug("translated: %s new sources %s names %s",
translated, really_new, names)
return (None, translated + really_new or names)
def makeName(self, addr):
log.debug("Make name %s", addr)
filename, module, call = addr
if filename is not None:
head = src(filename)
head = module
if call is not None:
return "%s:%s" % (head, call)
return head
def setOutputStream(self, stream):
"""Get handle on output stream so the plugin can print id #s
""" = stream
def startTest(self, test):
"""Maybe output an id # before the test name.
Example output::
#1 test.test ... ok
#2 test.test_two ... ok
adr = test.address()
log.debug('start test %s (%s)', adr, adr in self.tests)
if adr in self.tests:
if adr in self._seen:
self.write(' ')
self.write('#%s ' % self.tests[adr])
self._seen[adr] = 1
self.tests[adr] =
self.write('#%s ' % += 1
def afterTest(self, test):
# None means test never ran, False means failed/err
if test.passed is False:
key = str(self.tests[test.address()])
except KeyError:
# never saw this test -- startTest didn't run
if key not in self.failed:
def tr(self, name):
log.debug("tr '%s'", name)
key = int(name.replace('#', ''))
except ValueError:
return name
log.debug("Got key %s", key)
# I'm running tests mapped from the ids file,
# not collecting new ones
if key in self.ids:
return self.makeName(self.ids[key])
return name
def write(self, output):
if self._write_hashes: