Mirror
/
cpython
mirror of https://github.com/python/cpython
4
1
Fork 0
Code Issues Releases Wiki Activity
cpython/Lib/test/test_support.py

625 lines
21 KiB
Python
Raw Blame History

"""Supporting definitions for the Python regression tests."""
if __name__ != 'test.test_support':
raise ImportError('test_support must be imported from the test package')
import contextlib
import errno
import socket
import sys
import os
import os.path
import warnings
import types
import unittest
class Error(Exception):
"""Base class for regression test exceptions."""
class TestFailed(Error):
"""Test failed."""
class TestSkipped(Error):
"""Test skipped.
This can be raised to indicate that a test was deliberatly
skipped, but not because a feature wasn't available. For
example, if some resource can't be used, such as the network
appears to be unavailable, this should be raised instead of
TestFailed.
"""
class ResourceDenied(TestSkipped):
"""Test skipped because it requested a disallowed resource.
This is raised when a test calls requires() for a resource that
has not be enabled. It is used to distinguish between expected
and unexpected skips.
"""
verbose = 1 # Flag set to 0 by regrtest.py
use_resources = None # Flag set to [] by regrtest.py
max_memuse = 0 # Disable bigmem tests (they will still be run with
# small sizes, to make sure they work.)
# _original_stdout is meant to hold stdout at the time regrtest began.
# This may be "the real" stdout, or IDLE's emulation of stdout, or whatever.
# The point is to have some flavor of stdout the user can actually see.
_original_stdout = None
def record_original_stdout(stdout):
global _original_stdout
_original_stdout = stdout
def get_original_stdout():
return _original_stdout or sys.stdout
def unload(name):
try:
del sys.modules[name]
except KeyError:
pass
def unlink(filename):
try:
os.unlink(filename)
except OSError:
pass
def forget(modname):
'''"Forget" a module was ever imported by removing it from sys.modules and
deleting any .pyc and .pyo files.'''
unload(modname)
for dirname in sys.path:
unlink(os.path.join(dirname, modname + os.extsep + 'pyc'))
# Deleting the .pyo file cannot be within the 'try' for the .pyc since
# the chance exists that there is no .pyc (and thus the 'try' statement
# is exited) but there is a .pyo file.
unlink(os.path.join(dirname, modname + os.extsep + 'pyo'))
def is_resource_enabled(resource):
"""Test whether a resource is enabled. Known resources are set by
regrtest.py."""
return use_resources is not None and resource in use_resources
def requires(resource, msg=None):
"""Raise ResourceDenied if the specified resource is not available.
If the caller's module is __main__ then automatically return True. The
possibility of False being returned occurs when regrtest.py is executing."""
# see if the caller's module is __main__ - if so, treat as if
# the resource was set
if sys._getframe().f_back.f_globals.get("__name__") == "__main__":
return
if not is_resource_enabled(resource):
if msg is None:
msg = "Use of the `%s' resource not enabled" % resource
raise ResourceDenied(msg)
def bind_port(sock, host='', preferred_port=54321):
"""Try to bind the sock to a port. If we are running multiple
tests and we don't try multiple ports, the test can fails. This
makes the test more robust."""
# some random ports that hopefully no one is listening on.
for port in [preferred_port, 9907, 10243, 32999]:
try:
sock.bind((host, port))
return port
except socket.error, (err, msg):
if err != errno.EADDRINUSE:
raise
print >>sys.__stderr__, \
' WARNING: failed to listen on port %d, trying another' % port
raise TestFailed('unable to find port to listen on')
FUZZ = 1e-6
def fcmp(x, y): # fuzzy comparison function
if type(x) == type(0.0) or type(y) == type(0.0):
try:
x, y = coerce(x, y)
fuzz = (abs(x) + abs(y)) * FUZZ
if abs(x-y) <= fuzz:
return 0
except:
pass
elif type(x) == type(y) and type(x) in (type(()), type([])):
for i in range(min(len(x), len(y))):
outcome = fcmp(x[i], y[i])
if outcome != 0:
return outcome
return cmp(len(x), len(y))
return cmp(x, y)
try:
unicode
have_unicode = True
except NameError:
have_unicode = False
is_jython = sys.platform.startswith('java')
# Filename used for testing
if os.name == 'java':
# Jython disallows @ in module names
TESTFN = '$test'
elif os.name == 'riscos':
TESTFN = 'testfile'
else:
TESTFN = '@test'
# Unicode name only used if TEST_FN_ENCODING exists for the platform.
if have_unicode:
# Assuming sys.getfilesystemencoding()!=sys.getdefaultencoding()
# TESTFN_UNICODE is a filename that can be encoded using the
# file system encoding, but *not* with the default (ascii) encoding
if isinstance('', unicode):
# python -U
# XXX perhaps unicode() should accept Unicode strings?
TESTFN_UNICODE = "@test-\xe0\xf2"
else:
# 2 latin characters.
TESTFN_UNICODE = unicode("@test-\xe0\xf2", "latin-1")
TESTFN_ENCODING = sys.getfilesystemencoding()
# TESTFN_UNICODE_UNENCODEABLE is a filename that should *not* be
# able to be encoded by *either* the default or filesystem encoding.
# This test really only makes sense on Windows NT platforms
# which have special Unicode support in posixmodule.
if (not hasattr(sys, "getwindowsversion") or
sys.getwindowsversion()[3] < 2): # 0=win32s or 1=9x/ME
TESTFN_UNICODE_UNENCODEABLE = None
else:
# Japanese characters (I think - from bug 846133)
TESTFN_UNICODE_UNENCODEABLE = eval('u"@test-\u5171\u6709\u3055\u308c\u308b"')
try:
# XXX - Note - should be using TESTFN_ENCODING here - but for
# Windows, "mbcs" currently always operates as if in
# errors=ignore' mode - hence we get '?' characters rather than
# the exception. 'Latin1' operates as we expect - ie, fails.
# See [ 850997 ] mbcs encoding ignores errors
TESTFN_UNICODE_UNENCODEABLE.encode("Latin1")
except UnicodeEncodeError:
pass
else:
print \
'WARNING: The filename %r CAN be encoded by the filesystem. ' \
'Unicode filename tests may not be effective' \
% TESTFN_UNICODE_UNENCODEABLE
# Make sure we can write to TESTFN, try in /tmp if we can't
fp = None
try:
fp = open(TESTFN, 'w+')
except IOError:
TMP_TESTFN = os.path.join('/tmp', TESTFN)
try:
fp = open(TMP_TESTFN, 'w+')
TESTFN = TMP_TESTFN
del TMP_TESTFN
except IOError:
print ('WARNING: tests will fail, unable to write to: %s or %s' %
(TESTFN, TMP_TESTFN))
if fp is not None:
fp.close()
unlink(TESTFN)
del fp
def findfile(file, here=__file__):
"""Try to find a file on sys.path and the working directory. If it is not
found the argument passed to the function is returned (this does not
necessarily signal failure; could still be the legitimate path)."""
if os.path.isabs(file):
return file
path = sys.path
path = [os.path.dirname(here)] + path
for dn in path:
fn = os.path.join(dn, file)
if os.path.exists(fn): return fn
return file
def verify(condition, reason='test failed'):
"""Verify that condition is true. If not, raise TestFailed.
The optional argument reason can be given to provide
a better error text.
"""
if not condition:
raise TestFailed(reason)
def vereq(a, b):
"""Raise TestFailed if a == b is false.
This is better than verify(a == b) because, in case of failure, the
error message incorporates repr(a) and repr(b) so you can see the
inputs.
Note that "not (a == b)" isn't necessarily the same as "a != b"; the
former is tested.
"""
if not (a == b):
raise TestFailed("%r == %r" % (a, b))
def sortdict(dict):
"Like repr(dict), but in sorted order."
items = dict.items()
items.sort()
reprpairs = ["%r: %r" % pair for pair in items]
withcommas = ", ".join(reprpairs)
return "{%s}" % withcommas
def check_syntax_error(testcase, statement):
try:
compile(statement, '<test string>', 'exec')
except SyntaxError:
pass
else:
testcase.fail('Missing SyntaxError: "%s"' % statement)
def open_urlresource(url):
import urllib, urlparse
requires('urlfetch')
filename = urlparse.urlparse(url)[2].split('/')[-1] # '/': it's URL!
for path in [os.path.curdir, os.path.pardir]:
fn = os.path.join(path, filename)
if os.path.exists(fn):
return open(fn)
print >> get_original_stdout(), '\tfetching %s ...' % url
fn, _ = urllib.urlretrieve(url, filename)
return open(fn)
@contextlib.contextmanager
def guard_warnings_filter():
"""Guard the warnings filter from being permanently changed."""
original_filters = warnings.filters[:]
try:
yield
finally:
warnings.filters = original_filters
class WarningMessage(object):
"Holds the result of the latest showwarning() call"
def __init__(self):
self.message = None
self.category = None
self.filename = None
self.lineno = None
def _showwarning(self, message, category, filename, lineno, file=None):
self.message = message
self.category = category
self.filename = filename
self.lineno = lineno
@contextlib.contextmanager
def catch_warning():
"""
Guard the warnings filter from being permanently changed and record the
data of the last warning that has been issued.
Use like this:
with catch_warning as w:
warnings.warn("foo")
assert str(w.message) == "foo"
"""
warning = WarningMessage()
original_filters = warnings.filters[:]
original_showwarning = warnings.showwarning
warnings.showwarning = warning._showwarning
try:
yield warning
finally:
warnings.showwarning = original_showwarning
warnings.filters = original_filters
class EnvironmentVarGuard(object):
"""Class to help protect the environment variable properly. Can be used as
a context manager."""
def __init__(self):
self._environ = os.environ
self._unset = set()
self._reset = dict()
def set(self, envvar, value):
if envvar not in self._environ:
self._unset.add(envvar)
else:
self._reset[envvar] = self._environ[envvar]
self._environ[envvar] = value
def unset(self, envvar):
if envvar in self._environ:
self._reset[envvar] = self._environ[envvar]
del self._environ[envvar]
def __enter__(self):
return self
def __exit__(self, *ignore_exc):
for envvar, value in self._reset.iteritems():
self._environ[envvar] = value
for unset in self._unset:
del self._environ[unset]
class TransientResource(object):
"""Raise ResourceDenied if an exception is raised while the context manager
is in effect that matches the specified exception and attributes."""
def __init__(self, exc, **kwargs):
self.exc = exc
self.attrs = kwargs
def __enter__(self):
return self
def __exit__(self, type_=None, value=None, traceback=None):
"""If type_ is a subclass of self.exc and value has attributes matching
self.attrs, raise ResourceDenied. Otherwise let the exception
propagate (if any)."""
if type_ is not None and issubclass(self.exc, type_):
for attr, attr_value in self.attrs.iteritems():
if not hasattr(value, attr):
break
if getattr(value, attr) != attr_value:
break
else:
raise ResourceDenied("an optional resource is not available")
def transient_internet():
"""Return a context manager that raises ResourceDenied when various issues
with the Internet connection manifest themselves as exceptions."""
time_out = TransientResource(IOError, errno=errno.ETIMEDOUT)
socket_peer_reset = TransientResource(socket.error, errno=errno.ECONNRESET)
ioerror_peer_reset = TransientResource(IOError, errno=errno.ECONNRESET)
return contextlib.nested(time_out, socket_peer_reset, ioerror_peer_reset)
#=======================================================================
# Decorator for running a function in a different locale, correctly resetting
# it afterwards.
def run_with_locale(catstr, *locales):
def decorator(func):
def inner(*args, **kwds):
try:
import locale
category = getattr(locale, catstr)
orig_locale = locale.setlocale(category)
except AttributeError:
# if the test author gives us an invalid category string
raise
except:
# cannot retrieve original locale, so do nothing
locale = orig_locale = None
else:
for loc in locales:
try:
locale.setlocale(category, loc)
break
except:
pass
# now run the function, resetting the locale on exceptions
try:
return func(*args, **kwds)
finally:
if locale and orig_locale:
locale.setlocale(category, orig_locale)
inner.func_name = func.func_name
inner.__doc__ = func.__doc__
return inner
return decorator
#=======================================================================
# Big-memory-test support. Separate from 'resources' because memory use should be configurable.
# Some handy shorthands. Note that these are used for byte-limits as well
# as size-limits, in the various bigmem tests
_1M = 1024*1024
_1G = 1024 * _1M
_2G = 2 * _1G
# Hack to get at the maximum value an internal index can take.
class _Dummy:
def __getslice__(self, i, j):
return j
MAX_Py_ssize_t = _Dummy()[:]
def set_memlimit(limit):
import re
global max_memuse
sizes = {
'k': 1024,
'm': _1M,
'g': _1G,
't': 1024*_1G,
}
m = re.match(r'(\d+(\.\d+)?) (K|M|G|T)b?$', limit,
re.IGNORECASE | re.VERBOSE)
if m is None:
raise ValueError('Invalid memory limit %r' % (limit,))
memlimit = int(float(m.group(1)) * sizes[m.group(3).lower()])
if memlimit > MAX_Py_ssize_t:
memlimit = MAX_Py_ssize_t
if memlimit < _2G - 1:
raise ValueError('Memory limit %r too low to be useful' % (limit,))
max_memuse = memlimit
def bigmemtest(minsize, memuse, overhead=5*_1M):
"""Decorator for bigmem tests.
'minsize' is the minimum useful size for the test (in arbitrary,
test-interpreted units.) 'memuse' is the number of 'bytes per size' for
the test, or a good estimate of it. 'overhead' specifies fixed overhead,
independant of the testsize, and defaults to 5Mb.
The decorator tries to guess a good value for 'size' and passes it to
the decorated test function. If minsize * memuse is more than the
allowed memory use (as defined by max_memuse), the test is skipped.
Otherwise, minsize is adjusted upward to use up to max_memuse.
"""
def decorator(f):
def wrapper(self):
if not max_memuse:
# If max_memuse is 0 (the default),
# we still want to run the tests with size set to a few kb,
# to make sure they work. We still want to avoid using
# too much memory, though, but we do that noisily.
maxsize = 5147
self.failIf(maxsize * memuse + overhead > 20 * _1M)
else:
maxsize = int((max_memuse - overhead) / memuse)
if maxsize < minsize:
# Really ought to print 'test skipped' or something
if verbose:
sys.stderr.write("Skipping %s because of memory "
"constraint\n" % (f.__name__,))
return
# Try to keep some breathing room in memory use
maxsize = max(maxsize - 50 * _1M, minsize)
return f(self, maxsize)
wrapper.minsize = minsize
wrapper.memuse = memuse
wrapper.overhead = overhead
return wrapper
return decorator
def bigaddrspacetest(f):
"""Decorator for tests that fill the address space."""
def wrapper(self):
if max_memuse < MAX_Py_ssize_t:
if verbose:
sys.stderr.write("Skipping %s because of memory "
"constraint\n" % (f.__name__,))
else:
return f(self)
return wrapper
#=======================================================================
# unittest integration.
class BasicTestRunner:
def run(self, test):
result = unittest.TestResult()
test(result)
return result
def _run_suite(suite):
"""Run tests from a unittest.TestSuite-derived class."""
if verbose:
runner = unittest.TextTestRunner(sys.stdout, verbosity=2)
else:
runner = BasicTestRunner()
result = runner.run(suite)
if not result.wasSuccessful():
if len(result.errors) == 1 and not result.failures:
err = result.errors[0][1]
elif len(result.failures) == 1 and not result.errors:
err = result.failures[0][1]
else:
msg = "errors occurred; run in verbose mode for details"
raise TestFailed(msg)
raise TestFailed(err)
def run_unittest(*classes):
"""Run tests from unittest.TestCase-derived classes."""
valid_types = (unittest.TestSuite, unittest.TestCase)
suite = unittest.TestSuite()
for cls in classes:
if isinstance(cls, str):
if cls in sys.modules:
suite.addTest(unittest.findTestCases(sys.modules[cls]))
else:
raise ValueError("str arguments must be keys in sys.modules")
elif isinstance(cls, valid_types):
suite.addTest(cls)
else:
suite.addTest(unittest.makeSuite(cls))
_run_suite(suite)
#=======================================================================
# doctest driver.
def run_doctest(module, verbosity=None):
"""Run doctest on the given module. Return (#failures, #tests).
If optional argument verbosity is not specified (or is None), pass
test_support's belief about verbosity on to doctest. Else doctest's
usual behavior is used (it searches sys.argv for -v).
"""
import doctest
if verbosity is None:
verbosity = verbose
else:
verbosity = None
# Direct doctest output (normally just errors) to real stdout; doctest
# output shouldn't be compared by regrtest.
save_stdout = sys.stdout
sys.stdout = get_original_stdout()
try:
f, t = doctest.testmod(module, verbose=verbosity)
if f:
raise TestFailed("%d of %d doctests failed" % (f, t))
finally:
sys.stdout = save_stdout
if verbose:
print 'doctest (%s) ... %d tests with zero failures' % (module.__name__, t)
return f, t
#=======================================================================
# Threading support to prevent reporting refleaks when running regrtest.py -R
def threading_setup():
import threading
return len(threading._active), len(threading._limbo)
def threading_cleanup(num_active, num_limbo):
import threading
import time
_MAX_COUNT = 10
count = 0
while len(threading._active) != num_active and count < _MAX_COUNT:
count += 1
time.sleep(0.1)
count = 0
while len(threading._limbo) != num_limbo and count < _MAX_COUNT:
count += 1
time.sleep(0.1)
def reap_children():
"""Use this function at the end of test_main() whenever sub-processes
are started. This will help ensure that no extra children (zombies)
stick around to hog resources and create problems when looking
for refleaks.
"""
# Reap all our dead child processes so we don't leave zombies around.
# These hog resources and might be causing some of the buildbots to die.
if hasattr(os, 'waitpid'):
any_process = -1
while True:
try:
# This will raise an exception on Windows. That's ok.
pid, status = os.waitpid(any_process, os.WNOHANG)
if pid == 0:
break
except:
break
Reference in New Issue View Git Blame Copy Permalink