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# These classes implement a doctest runner plugin for nose, a "known failure"
# error class, and a customized TestProgram for NumPy.
# Because this module imports nose directly, it should not
# be used except by nosetester.py to avoid a general NumPy
# dependency on nose.
from __future__ import division, absolute_import, print_function
import os
import doctest
import inspect
import nose
from nose.plugins import doctests as npd
from nose.plugins.errorclass import ErrorClass, ErrorClassPlugin
from nose.plugins.base import Plugin
from nose.util import src
import numpy
from .nosetester import get_package_name
from .utils import KnownFailureException, KnownFailureTest
# Some of the classes in this module begin with 'Numpy' to clearly distinguish
# them from the plethora of very similar names from nose/unittest/doctest
#-----------------------------------------------------------------------------
# Modified version of the one in the stdlib, that fixes a python bug (doctests
# not found in extension modules, http://bugs.python.org/issue3158)
class NumpyDocTestFinder(doctest.DocTestFinder):
def _from_module(self, module, object):
"""
Return true if the given object is defined in the given
module.
"""
if module is None:
return True
elif inspect.isfunction(object):
return module.__dict__ is object.__globals__
elif inspect.isbuiltin(object):
return module.__name__ == object.__module__
elif inspect.isclass(object):
return module.__name__ == object.__module__
elif inspect.ismethod(object):
# This one may be a bug in cython that fails to correctly set the
# __module__ attribute of methods, but since the same error is easy
# to make by extension code writers, having this safety in place
# isn't such a bad idea
return module.__name__ == object.__self__.__class__.__module__
elif inspect.getmodule(object) is not None:
return module is inspect.getmodule(object)
elif hasattr(object, '__module__'):
return module.__name__ == object.__module__
elif isinstance(object, property):
return True # [XX] no way not be sure.
else:
raise ValueError("object must be a class or function")
def _find(self, tests, obj, name, module, source_lines, globs, seen):
"""
Find tests for the given object and any contained objects, and
add them to `tests`.
"""
doctest.DocTestFinder._find(self, tests, obj, name, module,
source_lines, globs, seen)
# Below we re-run pieces of the above method with manual modifications,
# because the original code is buggy and fails to correctly identify
# doctests in extension modules.
# Local shorthands
from inspect import (
isroutine, isclass, ismodule, isfunction, ismethod
)
# Look for tests in a module's contained objects.
if ismodule(obj) and self._recurse:
for valname, val in obj.__dict__.items():
valname1 = '%s.%s' % (name, valname)
if ( (isroutine(val) or isclass(val))
and self._from_module(module, val)):
self._find(tests, val, valname1, module, source_lines,
globs, seen)
# Look for tests in a class's contained objects.
if isclass(obj) and self._recurse:
for valname, val in obj.__dict__.items():
# Special handling for staticmethod/classmethod.
if isinstance(val, staticmethod):
val = getattr(obj, valname)
if isinstance(val, classmethod):
val = getattr(obj, valname).__func__
# Recurse to methods, properties, and nested classes.
if ((isfunction(val) or isclass(val) or
ismethod(val) or isinstance(val, property)) and
self._from_module(module, val)):
valname = '%s.%s' % (name, valname)
self._find(tests, val, valname, module, source_lines,
globs, seen)
# second-chance checker; if the default comparison doesn't
# pass, then see if the expected output string contains flags that
# tell us to ignore the output
class NumpyOutputChecker(doctest.OutputChecker):
def check_output(self, want, got, optionflags):
ret = doctest.OutputChecker.check_output(self, want, got,
optionflags)
if not ret:
if "#random" in want:
return True
# it would be useful to normalize endianness so that
# bigendian machines don't fail all the tests (and there are
# actually some bigendian examples in the doctests). Let's try
# making them all little endian
got = got.replace("'>", "'<")
want = want.replace("'>", "'<")
# try to normalize out 32 and 64 bit default int sizes
for sz in [4, 8]:
got = got.replace("'<i%d'" % sz, "int")
want = want.replace("'<i%d'" % sz, "int")
ret = doctest.OutputChecker.check_output(self, want,
got, optionflags)
return ret
# Subclass nose.plugins.doctests.DocTestCase to work around a bug in
# its constructor that blocks non-default arguments from being passed
# down into doctest.DocTestCase
class NumpyDocTestCase(npd.DocTestCase):
def __init__(self, test, optionflags=0, setUp=None, tearDown=None,
checker=None, obj=None, result_var='_'):
self._result_var = result_var
self._nose_obj = obj
doctest.DocTestCase.__init__(self, test,
optionflags=optionflags,
setUp=setUp, tearDown=tearDown,
checker=checker)
print_state = numpy.get_printoptions()
class NumpyDoctest(npd.Doctest):
name = 'numpydoctest' # call nosetests with --with-numpydoctest
score = 1000 # load late, after doctest builtin
# always use whitespace and ellipsis options for doctests
doctest_optflags = doctest.NORMALIZE_WHITESPACE | doctest.ELLIPSIS
# files that should be ignored for doctests
doctest_ignore = ['generate_numpy_api.py',
'setup.py']
# Custom classes; class variables to allow subclassing
doctest_case_class = NumpyDocTestCase
out_check_class = NumpyOutputChecker
test_finder_class = NumpyDocTestFinder
# Don't use the standard doctest option handler; hard-code the option values
def options(self, parser, env=os.environ):
Plugin.options(self, parser, env)
# Test doctests in 'test' files / directories. Standard plugin default
# is False
self.doctest_tests = True
# Variable name; if defined, doctest results stored in this variable in
# the top-level namespace. None is the standard default
self.doctest_result_var = None
def configure(self, options, config):
# parent method sets enabled flag from command line --with-numpydoctest
Plugin.configure(self, options, config)
self.finder = self.test_finder_class()
self.parser = doctest.DocTestParser()
if self.enabled:
# Pull standard doctest out of plugin list; there's no reason to run
# both. In practice the Unplugger plugin above would cover us when
# run from a standard numpy.test() call; this is just in case
# someone wants to run our plugin outside the numpy.test() machinery
config.plugins.plugins = [p for p in config.plugins.plugins
if p.name != 'doctest']
def set_test_context(self, test):
""" Configure `test` object to set test context
We set the numpy / scipy standard doctest namespace
Parameters
----------
test : test object
with ``globs`` dictionary defining namespace
Returns
-------
None
Notes
-----
`test` object modified in place
"""
# set the namespace for tests
pkg_name = get_package_name(os.path.dirname(test.filename))
# Each doctest should execute in an environment equivalent to
# starting Python and executing "import numpy as np", and,
# for SciPy packages, an additional import of the local
# package (so that scipy.linalg.basic.py's doctests have an
# implicit "from scipy import linalg" as well.
#
# Note: __file__ allows the doctest in NoseTester to run
# without producing an error
test.globs = {'__builtins__':__builtins__,
'__file__':'__main__',
'__name__':'__main__',
'np':numpy}
# add appropriate scipy import for SciPy tests
if 'scipy' in pkg_name:
p = pkg_name.split('.')
p2 = p[-1]
test.globs[p2] = __import__(pkg_name, test.globs, {}, [p2])
# Override test loading to customize test context (with set_test_context
# method), set standard docstring options, and install our own test output
# checker
def loadTestsFromModule(self, module):
if not self.matches(module.__name__):
npd.log.debug("Doctest doesn't want module %s", module)
return
try:
tests = self.finder.find(module)
except AttributeError:
# nose allows module.__test__ = False; doctest does not and
# throws AttributeError
return
if not tests:
return
tests.sort()
module_file = src(module.__file__)
for test in tests:
if not test.examples:
continue
if not test.filename:
test.filename = module_file
# Set test namespace; test altered in place
self.set_test_context(test)
yield self.doctest_case_class(test,
optionflags=self.doctest_optflags,
checker=self.out_check_class(),
result_var=self.doctest_result_var)
# Add an afterContext method to nose.plugins.doctests.Doctest in order
# to restore print options to the original state after each doctest
def afterContext(self):
numpy.set_printoptions(**print_state)
# Ignore NumPy-specific build files that shouldn't be searched for tests
def wantFile(self, file):
bn = os.path.basename(file)
if bn in self.doctest_ignore:
return False
return npd.Doctest.wantFile(self, file)
class Unplugger(object):
""" Nose plugin to remove named plugin late in loading
By default it removes the "doctest" plugin.
"""
name = 'unplugger'
enabled = True # always enabled
score = 4000 # load late in order to be after builtins
def __init__(self, to_unplug='doctest'):
self.to_unplug = to_unplug
def options(self, parser, env):
pass
def configure(self, options, config):
# Pull named plugin out of plugins list
config.plugins.plugins = [p for p in config.plugins.plugins
if p.name != self.to_unplug]
class KnownFailurePlugin(ErrorClassPlugin):
'''Plugin that installs a KNOWNFAIL error class for the
KnownFailureClass exception. When KnownFailure is raised,
the exception will be logged in the knownfail attribute of the
result, 'K' or 'KNOWNFAIL' (verbose) will be output, and the
exception will not be counted as an error or failure.'''
enabled = True
knownfail = ErrorClass(KnownFailureException,
label='KNOWNFAIL',
isfailure=False)
def options(self, parser, env=os.environ):
env_opt = 'NOSE_WITHOUT_KNOWNFAIL'
parser.add_option('--no-knownfail', action='store_true',
dest='noKnownFail', default=env.get(env_opt, False),
help='Disable special handling of KnownFailure '
'exceptions')
def configure(self, options, conf):
if not self.can_configure:
return
self.conf = conf
disable = getattr(options, 'noKnownFail', False)
if disable:
self.enabled = False
KnownFailure = KnownFailurePlugin # backwards compat
# Class allows us to save the results of the tests in runTests - see runTests
# method docstring for details
class NumpyTestProgram(nose.core.TestProgram):
def runTests(self):
"""Run Tests. Returns true on success, false on failure, and
sets self.success to the same value.
Because nose currently discards the test result object, but we need
to return it to the user, override TestProgram.runTests to retain
the result
"""
if self.testRunner is None:
self.testRunner = nose.core.TextTestRunner(stream=self.config.stream,
verbosity=self.config.verbosity,
config=self.config)
plug_runner = self.config.plugins.prepareTestRunner(self.testRunner)
if plug_runner is not None:
self.testRunner = plug_runner
self.result = self.testRunner.run(self.test)
self.success = self.result.wasSuccessful()
return self.success
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