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