| """Supporting definitions for the Python regression tests.""" |
| |
| if __name__ != 'test.support': |
| raise ImportError('support must be imported from the test package') |
| |
| import contextlib |
| import errno |
| import functools |
| import gc |
| import socket |
| import sys |
| import os |
| import platform |
| import shutil |
| import warnings |
| import unittest |
| import importlib |
| import collections.abc |
| import re |
| import subprocess |
| import imp |
| import time |
| import sysconfig |
| import fnmatch |
| import logging.handlers |
| import struct |
| import tempfile |
| |
| try: |
| import _thread, threading |
| except ImportError: |
| _thread = None |
| threading = None |
| try: |
| import multiprocessing.process |
| except ImportError: |
| multiprocessing = None |
| |
| try: |
| import zlib |
| except ImportError: |
| zlib = None |
| |
| try: |
| import bz2 |
| except ImportError: |
| bz2 = None |
| |
| try: |
| import lzma |
| except ImportError: |
| lzma = None |
| |
| __all__ = [ |
| "Error", "TestFailed", "ResourceDenied", "import_module", "verbose", |
| "use_resources", "max_memuse", "record_original_stdout", |
| "get_original_stdout", "unload", "unlink", "rmtree", "forget", |
| "is_resource_enabled", "requires", "requires_freebsd_version", |
| "requires_linux_version", "requires_mac_ver", "find_unused_port", |
| "bind_port", "IPV6_ENABLED", "is_jython", "TESTFN", "HOST", "SAVEDCWD", |
| "temp_cwd", "findfile", "create_empty_file", "sortdict", |
| "check_syntax_error", "open_urlresource", "check_warnings", "CleanImport", |
| "EnvironmentVarGuard", "TransientResource", "captured_stdout", |
| "captured_stdin", "captured_stderr", "time_out", "socket_peer_reset", |
| "ioerror_peer_reset", "run_with_locale", 'temp_umask', |
| "transient_internet", "set_memlimit", "bigmemtest", "bigaddrspacetest", |
| "BasicTestRunner", "run_unittest", "run_doctest", "threading_setup", |
| "threading_cleanup", "reap_children", "cpython_only", "check_impl_detail", |
| "get_attribute", "swap_item", "swap_attr", "requires_IEEE_754", |
| "TestHandler", "Matcher", "can_symlink", "skip_unless_symlink", |
| "skip_unless_xattr", "import_fresh_module", "requires_zlib", |
| "PIPE_MAX_SIZE", "failfast", "anticipate_failure", "run_with_tz", |
| "requires_bz2", "requires_lzma" |
| ] |
| |
| class Error(Exception): |
| """Base class for regression test exceptions.""" |
| |
| class TestFailed(Error): |
| """Test failed.""" |
| |
| class ResourceDenied(unittest.SkipTest): |
| """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. |
| """ |
| |
| @contextlib.contextmanager |
| def _ignore_deprecated_imports(ignore=True): |
| """Context manager to suppress package and module deprecation |
| warnings when importing them. |
| |
| If ignore is False, this context manager has no effect.""" |
| if ignore: |
| with warnings.catch_warnings(): |
| warnings.filterwarnings("ignore", ".+ (module|package)", |
| DeprecationWarning) |
| yield |
| else: |
| yield |
| |
| |
| def import_module(name, deprecated=False): |
| """Import and return the module to be tested, raising SkipTest if |
| it is not available. |
| |
| If deprecated is True, any module or package deprecation messages |
| will be suppressed.""" |
| with _ignore_deprecated_imports(deprecated): |
| try: |
| return importlib.import_module(name) |
| except ImportError as msg: |
| raise unittest.SkipTest(str(msg)) |
| |
| |
| def _save_and_remove_module(name, orig_modules): |
| """Helper function to save and remove a module from sys.modules |
| |
| Raise ImportError if the module can't be imported.""" |
| # try to import the module and raise an error if it can't be imported |
| if name not in sys.modules: |
| __import__(name) |
| del sys.modules[name] |
| for modname in list(sys.modules): |
| if modname == name or modname.startswith(name + '.'): |
| orig_modules[modname] = sys.modules[modname] |
| del sys.modules[modname] |
| |
| def _save_and_block_module(name, orig_modules): |
| """Helper function to save and block a module in sys.modules |
| |
| Return True if the module was in sys.modules, False otherwise.""" |
| saved = True |
| try: |
| orig_modules[name] = sys.modules[name] |
| except KeyError: |
| saved = False |
| sys.modules[name] = None |
| return saved |
| |
| |
| def anticipate_failure(condition): |
| """Decorator to mark a test that is known to be broken in some cases |
| |
| Any use of this decorator should have a comment identifying the |
| associated tracker issue. |
| """ |
| if condition: |
| return unittest.expectedFailure |
| return lambda f: f |
| |
| |
| def import_fresh_module(name, fresh=(), blocked=(), deprecated=False): |
| """Imports and returns a module, deliberately bypassing the sys.modules cache |
| and importing a fresh copy of the module. Once the import is complete, |
| the sys.modules cache is restored to its original state. |
| |
| Modules named in fresh are also imported anew if needed by the import. |
| If one of these modules can't be imported, None is returned. |
| |
| Importing of modules named in blocked is prevented while the fresh import |
| takes place. |
| |
| If deprecated is True, any module or package deprecation messages |
| will be suppressed.""" |
| # NOTE: test_heapq, test_json and test_warnings include extra sanity checks |
| # to make sure that this utility function is working as expected |
| with _ignore_deprecated_imports(deprecated): |
| # Keep track of modules saved for later restoration as well |
| # as those which just need a blocking entry removed |
| orig_modules = {} |
| names_to_remove = [] |
| _save_and_remove_module(name, orig_modules) |
| try: |
| for fresh_name in fresh: |
| _save_and_remove_module(fresh_name, orig_modules) |
| for blocked_name in blocked: |
| if not _save_and_block_module(blocked_name, orig_modules): |
| names_to_remove.append(blocked_name) |
| fresh_module = importlib.import_module(name) |
| except ImportError: |
| fresh_module = None |
| finally: |
| for orig_name, module in orig_modules.items(): |
| sys.modules[orig_name] = module |
| for name_to_remove in names_to_remove: |
| del sys.modules[name_to_remove] |
| return fresh_module |
| |
| |
| def get_attribute(obj, name): |
| """Get an attribute, raising SkipTest if AttributeError is raised.""" |
| try: |
| attribute = getattr(obj, name) |
| except AttributeError: |
| raise unittest.SkipTest("object %r has no attribute %r" % (obj, name)) |
| else: |
| return attribute |
| |
| 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.) |
| real_max_memuse = 0 |
| failfast = False |
| match_tests = None |
| |
| # _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 as error: |
| # The filename need not exist. |
| if error.errno not in (errno.ENOENT, errno.ENOTDIR): |
| raise |
| |
| def rmtree(path): |
| try: |
| shutil.rmtree(path) |
| except OSError as error: |
| if error.errno != errno.ENOENT: |
| raise |
| |
| def make_legacy_pyc(source): |
| """Move a PEP 3147 pyc/pyo file to its legacy pyc/pyo location. |
| |
| The choice of .pyc or .pyo extension is done based on the __debug__ flag |
| value. |
| |
| :param source: The file system path to the source file. The source file |
| does not need to exist, however the PEP 3147 pyc file must exist. |
| :return: The file system path to the legacy pyc file. |
| """ |
| pyc_file = imp.cache_from_source(source) |
| up_one = os.path.dirname(os.path.abspath(source)) |
| legacy_pyc = os.path.join(up_one, source + ('c' if __debug__ else 'o')) |
| os.rename(pyc_file, legacy_pyc) |
| return legacy_pyc |
| |
| def forget(modname): |
| """'Forget' a module was ever imported. |
| |
| This removes the module from sys.modules and deletes any PEP 3147 or |
| legacy .pyc and .pyo files. |
| """ |
| unload(modname) |
| for dirname in sys.path: |
| source = os.path.join(dirname, modname + '.py') |
| # It doesn't matter if they exist or not, unlink all possible |
| # combinations of PEP 3147 and legacy pyc and pyo files. |
| unlink(source + 'c') |
| unlink(source + 'o') |
| unlink(imp.cache_from_source(source, debug_override=True)) |
| unlink(imp.cache_from_source(source, debug_override=False)) |
| |
| # On some platforms, should not run gui test even if it is allowed |
| # in `use_resources'. |
| if sys.platform.startswith('win'): |
| import ctypes |
| import ctypes.wintypes |
| def _is_gui_available(): |
| UOI_FLAGS = 1 |
| WSF_VISIBLE = 0x0001 |
| class USEROBJECTFLAGS(ctypes.Structure): |
| _fields_ = [("fInherit", ctypes.wintypes.BOOL), |
| ("fReserved", ctypes.wintypes.BOOL), |
| ("dwFlags", ctypes.wintypes.DWORD)] |
| dll = ctypes.windll.user32 |
| h = dll.GetProcessWindowStation() |
| if not h: |
| raise ctypes.WinError() |
| uof = USEROBJECTFLAGS() |
| needed = ctypes.wintypes.DWORD() |
| res = dll.GetUserObjectInformationW(h, |
| UOI_FLAGS, |
| ctypes.byref(uof), |
| ctypes.sizeof(uof), |
| ctypes.byref(needed)) |
| if not res: |
| raise ctypes.WinError() |
| return bool(uof.dwFlags & WSF_VISIBLE) |
| else: |
| def _is_gui_available(): |
| return True |
| |
| 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. |
| """ |
| if resource == 'gui' and not _is_gui_available(): |
| raise unittest.SkipTest("Cannot use the 'gui' resource") |
| # see if the caller's module is __main__ - if so, treat as if |
| # the resource was set |
| if sys._getframe(1).f_globals.get("__name__") == "__main__": |
| return |
| if not is_resource_enabled(resource): |
| if msg is None: |
| msg = "Use of the %r resource not enabled" % resource |
| raise ResourceDenied(msg) |
| |
| def _requires_unix_version(sysname, min_version): |
| """Decorator raising SkipTest if the OS is `sysname` and the version is less |
| than `min_version`. |
| |
| For example, @_requires_unix_version('FreeBSD', (7, 2)) raises SkipTest if |
| the FreeBSD version is less than 7.2. |
| """ |
| def decorator(func): |
| @functools.wraps(func) |
| def wrapper(*args, **kw): |
| if platform.system() == sysname: |
| version_txt = platform.release().split('-', 1)[0] |
| try: |
| version = tuple(map(int, version_txt.split('.'))) |
| except ValueError: |
| pass |
| else: |
| if version < min_version: |
| min_version_txt = '.'.join(map(str, min_version)) |
| raise unittest.SkipTest( |
| "%s version %s or higher required, not %s" |
| % (sysname, min_version_txt, version_txt)) |
| return wrapper |
| return decorator |
| |
| def requires_freebsd_version(*min_version): |
| """Decorator raising SkipTest if the OS is FreeBSD and the FreeBSD version is |
| less than `min_version`. |
| |
| For example, @requires_freebsd_version(7, 2) raises SkipTest if the FreeBSD |
| version is less than 7.2. |
| """ |
| return _requires_unix_version('FreeBSD', min_version) |
| |
| def requires_linux_version(*min_version): |
| """Decorator raising SkipTest if the OS is Linux and the Linux version is |
| less than `min_version`. |
| |
| For example, @requires_linux_version(2, 6, 32) raises SkipTest if the Linux |
| version is less than 2.6.32. |
| """ |
| return _requires_unix_version('Linux', min_version) |
| |
| def requires_mac_ver(*min_version): |
| """Decorator raising SkipTest if the OS is Mac OS X and the OS X |
| version if less than min_version. |
| |
| For example, @requires_mac_ver(10, 5) raises SkipTest if the OS X version |
| is lesser than 10.5. |
| """ |
| def decorator(func): |
| @functools.wraps(func) |
| def wrapper(*args, **kw): |
| if sys.platform == 'darwin': |
| version_txt = platform.mac_ver()[0] |
| try: |
| version = tuple(map(int, version_txt.split('.'))) |
| except ValueError: |
| pass |
| else: |
| if version < min_version: |
| min_version_txt = '.'.join(map(str, min_version)) |
| raise unittest.SkipTest( |
| "Mac OS X %s or higher required, not %s" |
| % (min_version_txt, version_txt)) |
| return func(*args, **kw) |
| wrapper.min_version = min_version |
| return wrapper |
| return decorator |
| |
| |
| HOST = 'localhost' |
| |
| def find_unused_port(family=socket.AF_INET, socktype=socket.SOCK_STREAM): |
| """Returns an unused port that should be suitable for binding. This is |
| achieved by creating a temporary socket with the same family and type as |
| the 'sock' parameter (default is AF_INET, SOCK_STREAM), and binding it to |
| the specified host address (defaults to 0.0.0.0) with the port set to 0, |
| eliciting an unused ephemeral port from the OS. The temporary socket is |
| then closed and deleted, and the ephemeral port is returned. |
| |
| Either this method or bind_port() should be used for any tests where a |
| server socket needs to be bound to a particular port for the duration of |
| the test. Which one to use depends on whether the calling code is creating |
| a python socket, or if an unused port needs to be provided in a constructor |
| or passed to an external program (i.e. the -accept argument to openssl's |
| s_server mode). Always prefer bind_port() over find_unused_port() where |
| possible. Hard coded ports should *NEVER* be used. As soon as a server |
| socket is bound to a hard coded port, the ability to run multiple instances |
| of the test simultaneously on the same host is compromised, which makes the |
| test a ticking time bomb in a buildbot environment. On Unix buildbots, this |
| may simply manifest as a failed test, which can be recovered from without |
| intervention in most cases, but on Windows, the entire python process can |
| completely and utterly wedge, requiring someone to log in to the buildbot |
| and manually kill the affected process. |
| |
| (This is easy to reproduce on Windows, unfortunately, and can be traced to |
| the SO_REUSEADDR socket option having different semantics on Windows versus |
| Unix/Linux. On Unix, you can't have two AF_INET SOCK_STREAM sockets bind, |
| listen and then accept connections on identical host/ports. An EADDRINUSE |
| socket.error will be raised at some point (depending on the platform and |
| the order bind and listen were called on each socket). |
| |
| However, on Windows, if SO_REUSEADDR is set on the sockets, no EADDRINUSE |
| will ever be raised when attempting to bind two identical host/ports. When |
| accept() is called on each socket, the second caller's process will steal |
| the port from the first caller, leaving them both in an awkwardly wedged |
| state where they'll no longer respond to any signals or graceful kills, and |
| must be forcibly killed via OpenProcess()/TerminateProcess(). |
| |
| The solution on Windows is to use the SO_EXCLUSIVEADDRUSE socket option |
| instead of SO_REUSEADDR, which effectively affords the same semantics as |
| SO_REUSEADDR on Unix. Given the propensity of Unix developers in the Open |
| Source world compared to Windows ones, this is a common mistake. A quick |
| look over OpenSSL's 0.9.8g source shows that they use SO_REUSEADDR when |
| openssl.exe is called with the 's_server' option, for example. See |
| http://bugs.python.org/issue2550 for more info. The following site also |
| has a very thorough description about the implications of both REUSEADDR |
| and EXCLUSIVEADDRUSE on Windows: |
| http://msdn2.microsoft.com/en-us/library/ms740621(VS.85).aspx) |
| |
| XXX: although this approach is a vast improvement on previous attempts to |
| elicit unused ports, it rests heavily on the assumption that the ephemeral |
| port returned to us by the OS won't immediately be dished back out to some |
| other process when we close and delete our temporary socket but before our |
| calling code has a chance to bind the returned port. We can deal with this |
| issue if/when we come across it. |
| """ |
| |
| tempsock = socket.socket(family, socktype) |
| port = bind_port(tempsock) |
| tempsock.close() |
| del tempsock |
| return port |
| |
| def bind_port(sock, host=HOST): |
| """Bind the socket to a free port and return the port number. Relies on |
| ephemeral ports in order to ensure we are using an unbound port. This is |
| important as many tests may be running simultaneously, especially in a |
| buildbot environment. This method raises an exception if the sock.family |
| is AF_INET and sock.type is SOCK_STREAM, *and* the socket has SO_REUSEADDR |
| or SO_REUSEPORT set on it. Tests should *never* set these socket options |
| for TCP/IP sockets. The only case for setting these options is testing |
| multicasting via multiple UDP sockets. |
| |
| Additionally, if the SO_EXCLUSIVEADDRUSE socket option is available (i.e. |
| on Windows), it will be set on the socket. This will prevent anyone else |
| from bind()'ing to our host/port for the duration of the test. |
| """ |
| |
| if sock.family == socket.AF_INET and sock.type == socket.SOCK_STREAM: |
| if hasattr(socket, 'SO_REUSEADDR'): |
| if sock.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR) == 1: |
| raise TestFailed("tests should never set the SO_REUSEADDR " \ |
| "socket option on TCP/IP sockets!") |
| if hasattr(socket, 'SO_REUSEPORT'): |
| if sock.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT) == 1: |
| raise TestFailed("tests should never set the SO_REUSEPORT " \ |
| "socket option on TCP/IP sockets!") |
| if hasattr(socket, 'SO_EXCLUSIVEADDRUSE'): |
| sock.setsockopt(socket.SOL_SOCKET, socket.SO_EXCLUSIVEADDRUSE, 1) |
| |
| sock.bind((host, 0)) |
| port = sock.getsockname()[1] |
| return port |
| |
| def _is_ipv6_enabled(): |
| """Check whether IPv6 is enabled on this host.""" |
| if socket.has_ipv6: |
| try: |
| sock = socket.socket(socket.AF_INET6, socket.SOCK_STREAM) |
| sock.bind(('::1', 0)) |
| except (socket.error, socket.gaierror): |
| pass |
| else: |
| sock.close() |
| return True |
| return False |
| |
| IPV6_ENABLED = _is_ipv6_enabled() |
| |
| |
| # A constant likely larger than the underlying OS pipe buffer size. |
| # Windows limit seems to be around 512B, and most Unix kernels have a 64K pipe |
| # buffer size: take 1M to be sure. |
| PIPE_MAX_SIZE = 1024 * 1024 |
| |
| |
| # decorator for skipping tests on non-IEEE 754 platforms |
| requires_IEEE_754 = unittest.skipUnless( |
| float.__getformat__("double").startswith("IEEE"), |
| "test requires IEEE 754 doubles") |
| |
| requires_zlib = unittest.skipUnless(zlib, 'requires zlib') |
| |
| requires_bz2 = unittest.skipUnless(bz2, 'requires bz2') |
| |
| requires_lzma = unittest.skipUnless(lzma, 'requires lzma') |
| |
| is_jython = sys.platform.startswith('java') |
| |
| # Filename used for testing |
| if os.name == 'java': |
| # Jython disallows @ in module names |
| TESTFN = '$test' |
| else: |
| TESTFN = '@test' |
| |
| # Disambiguate TESTFN for parallel testing, while letting it remain a valid |
| # module name. |
| TESTFN = "{}_{}_tmp".format(TESTFN, os.getpid()) |
| |
| |
| # TESTFN_UNICODE is a non-ascii filename |
| TESTFN_UNICODE = TESTFN + "-\xe0\xf2\u0258\u0141\u011f" |
| if sys.platform == 'darwin': |
| # In Mac OS X's VFS API file names are, by definition, canonically |
| # decomposed Unicode, encoded using UTF-8. See QA1173: |
| # http://developer.apple.com/mac/library/qa/qa2001/qa1173.html |
| import unicodedata |
| TESTFN_UNICODE = unicodedata.normalize('NFD', TESTFN_UNICODE) |
| TESTFN_ENCODING = sys.getfilesystemencoding() |
| |
| # TESTFN_UNENCODABLE is a filename (str type) that should *not* be able to be |
| # encoded by the filesystem encoding (in strict mode). It can be None if we |
| # cannot generate such filename. |
| TESTFN_UNENCODABLE = None |
| if os.name in ('nt', 'ce'): |
| # skip win32s (0) or Windows 9x/ME (1) |
| if sys.getwindowsversion().platform >= 2: |
| # Different kinds of characters from various languages to minimize the |
| # probability that the whole name is encodable to MBCS (issue #9819) |
| TESTFN_UNENCODABLE = TESTFN + "-\u5171\u0141\u2661\u0363\uDC80" |
| try: |
| TESTFN_UNENCODABLE.encode(TESTFN_ENCODING) |
| except UnicodeEncodeError: |
| pass |
| else: |
| print('WARNING: The filename %r CAN be encoded by the filesystem encoding (%s). ' |
| 'Unicode filename tests may not be effective' |
| % (TESTFN_UNENCODABLE, TESTFN_ENCODING)) |
| TESTFN_UNENCODABLE = None |
| # Mac OS X denies unencodable filenames (invalid utf-8) |
| elif sys.platform != 'darwin': |
| try: |
| # ascii and utf-8 cannot encode the byte 0xff |
| b'\xff'.decode(TESTFN_ENCODING) |
| except UnicodeDecodeError: |
| # 0xff will be encoded using the surrogate character u+DCFF |
| TESTFN_UNENCODABLE = TESTFN \ |
| + b'-\xff'.decode(TESTFN_ENCODING, 'surrogateescape') |
| else: |
| # File system encoding (eg. ISO-8859-* encodings) can encode |
| # the byte 0xff. Skip some unicode filename tests. |
| pass |
| |
| # Save the initial cwd |
| SAVEDCWD = os.getcwd() |
| |
| @contextlib.contextmanager |
| def temp_cwd(name='tempcwd', quiet=False, path=None): |
| """ |
| Context manager that temporarily changes the CWD. |
| |
| An existing path may be provided as *path*, in which case this |
| function makes no changes to the file system. |
| |
| Otherwise, the new CWD is created in the current directory and it's |
| named *name*. If *quiet* is False (default) and it's not possible to |
| create or change the CWD, an error is raised. If it's True, only a |
| warning is raised and the original CWD is used. |
| """ |
| saved_dir = os.getcwd() |
| is_temporary = False |
| if path is None: |
| path = name |
| try: |
| os.mkdir(name) |
| is_temporary = True |
| except OSError: |
| if not quiet: |
| raise |
| warnings.warn('tests may fail, unable to create temp CWD ' + name, |
| RuntimeWarning, stacklevel=3) |
| try: |
| os.chdir(path) |
| except OSError: |
| if not quiet: |
| raise |
| warnings.warn('tests may fail, unable to change the CWD to ' + name, |
| RuntimeWarning, stacklevel=3) |
| try: |
| yield os.getcwd() |
| finally: |
| os.chdir(saved_dir) |
| if is_temporary: |
| rmtree(name) |
| |
| |
| if hasattr(os, "umask"): |
| @contextlib.contextmanager |
| def temp_umask(umask): |
| """Context manager that temporarily sets the process umask.""" |
| oldmask = os.umask(umask) |
| try: |
| yield |
| finally: |
| os.umask(oldmask) |
| |
| |
| def findfile(file, here=__file__, subdir=None): |
| """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 |
| if subdir is not None: |
| file = os.path.join(subdir, 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 create_empty_file(filename): |
| """Create an empty file. If the file already exists, truncate it.""" |
| fd = os.open(filename, os.O_WRONLY | os.O_CREAT | os.O_TRUNC) |
| os.close(fd) |
| |
| def sortdict(dict): |
| "Like repr(dict), but in sorted order." |
| items = sorted(dict.items()) |
| reprpairs = ["%r: %r" % pair for pair in items] |
| withcommas = ", ".join(reprpairs) |
| return "{%s}" % withcommas |
| |
| def make_bad_fd(): |
| """ |
| Create an invalid file descriptor by opening and closing a file and return |
| its fd. |
| """ |
| file = open(TESTFN, "wb") |
| try: |
| return file.fileno() |
| finally: |
| file.close() |
| unlink(TESTFN) |
| |
| def check_syntax_error(testcase, statement): |
| testcase.assertRaises(SyntaxError, compile, statement, |
| '<test string>', 'exec') |
| |
| def open_urlresource(url, *args, **kw): |
| import urllib.request, urllib.parse |
| |
| check = kw.pop('check', None) |
| |
| filename = urllib.parse.urlparse(url)[2].split('/')[-1] # '/': it's URL! |
| |
| fn = os.path.join(os.path.dirname(__file__), "data", filename) |
| |
| def check_valid_file(fn): |
| f = open(fn, *args, **kw) |
| if check is None: |
| return f |
| elif check(f): |
| f.seek(0) |
| return f |
| f.close() |
| |
| if os.path.exists(fn): |
| f = check_valid_file(fn) |
| if f is not None: |
| return f |
| unlink(fn) |
| |
| # Verify the requirement before downloading the file |
| requires('urlfetch') |
| |
| print('\tfetching %s ...' % url, file=get_original_stdout()) |
| f = urllib.request.urlopen(url, timeout=15) |
| try: |
| with open(fn, "wb") as out: |
| s = f.read() |
| while s: |
| out.write(s) |
| s = f.read() |
| finally: |
| f.close() |
| |
| f = check_valid_file(fn) |
| if f is not None: |
| return f |
| raise TestFailed('invalid resource %r' % fn) |
| |
| |
| class WarningsRecorder(object): |
| """Convenience wrapper for the warnings list returned on |
| entry to the warnings.catch_warnings() context manager. |
| """ |
| def __init__(self, warnings_list): |
| self._warnings = warnings_list |
| self._last = 0 |
| |
| def __getattr__(self, attr): |
| if len(self._warnings) > self._last: |
| return getattr(self._warnings[-1], attr) |
| elif attr in warnings.WarningMessage._WARNING_DETAILS: |
| return None |
| raise AttributeError("%r has no attribute %r" % (self, attr)) |
| |
| @property |
| def warnings(self): |
| return self._warnings[self._last:] |
| |
| def reset(self): |
| self._last = len(self._warnings) |
| |
| |
| def _filterwarnings(filters, quiet=False): |
| """Catch the warnings, then check if all the expected |
| warnings have been raised and re-raise unexpected warnings. |
| If 'quiet' is True, only re-raise the unexpected warnings. |
| """ |
| # Clear the warning registry of the calling module |
| # in order to re-raise the warnings. |
| frame = sys._getframe(2) |
| registry = frame.f_globals.get('__warningregistry__') |
| if registry: |
| registry.clear() |
| with warnings.catch_warnings(record=True) as w: |
| # Set filter "always" to record all warnings. Because |
| # test_warnings swap the module, we need to look up in |
| # the sys.modules dictionary. |
| sys.modules['warnings'].simplefilter("always") |
| yield WarningsRecorder(w) |
| # Filter the recorded warnings |
| reraise = list(w) |
| missing = [] |
| for msg, cat in filters: |
| seen = False |
| for w in reraise[:]: |
| warning = w.message |
| # Filter out the matching messages |
| if (re.match(msg, str(warning), re.I) and |
| issubclass(warning.__class__, cat)): |
| seen = True |
| reraise.remove(w) |
| if not seen and not quiet: |
| # This filter caught nothing |
| missing.append((msg, cat.__name__)) |
| if reraise: |
| raise AssertionError("unhandled warning %s" % reraise[0]) |
| if missing: |
| raise AssertionError("filter (%r, %s) did not catch any warning" % |
| missing[0]) |
| |
| |
| @contextlib.contextmanager |
| def check_warnings(*filters, **kwargs): |
| """Context manager to silence warnings. |
| |
| Accept 2-tuples as positional arguments: |
| ("message regexp", WarningCategory) |
| |
| Optional argument: |
| - if 'quiet' is True, it does not fail if a filter catches nothing |
| (default True without argument, |
| default False if some filters are defined) |
| |
| Without argument, it defaults to: |
| check_warnings(("", Warning), quiet=True) |
| """ |
| quiet = kwargs.get('quiet') |
| if not filters: |
| filters = (("", Warning),) |
| # Preserve backward compatibility |
| if quiet is None: |
| quiet = True |
| return _filterwarnings(filters, quiet) |
| |
| |
| class CleanImport(object): |
| """Context manager to force import to return a new module reference. |
| |
| This is useful for testing module-level behaviours, such as |
| the emission of a DeprecationWarning on import. |
| |
| Use like this: |
| |
| with CleanImport("foo"): |
| importlib.import_module("foo") # new reference |
| """ |
| |
| def __init__(self, *module_names): |
| self.original_modules = sys.modules.copy() |
| for module_name in module_names: |
| if module_name in sys.modules: |
| module = sys.modules[module_name] |
| # It is possible that module_name is just an alias for |
| # another module (e.g. stub for modules renamed in 3.x). |
| # In that case, we also need delete the real module to clear |
| # the import cache. |
| if module.__name__ != module_name: |
| del sys.modules[module.__name__] |
| del sys.modules[module_name] |
| |
| def __enter__(self): |
| return self |
| |
| def __exit__(self, *ignore_exc): |
| sys.modules.update(self.original_modules) |
| |
| |
| class EnvironmentVarGuard(collections.abc.MutableMapping): |
| |
| """Class to help protect the environment variable properly. Can be used as |
| a context manager.""" |
| |
| def __init__(self): |
| self._environ = os.environ |
| self._changed = {} |
| |
| def __getitem__(self, envvar): |
| return self._environ[envvar] |
| |
| def __setitem__(self, envvar, value): |
| # Remember the initial value on the first access |
| if envvar not in self._changed: |
| self._changed[envvar] = self._environ.get(envvar) |
| self._environ[envvar] = value |
| |
| def __delitem__(self, envvar): |
| # Remember the initial value on the first access |
| if envvar not in self._changed: |
| self._changed[envvar] = self._environ.get(envvar) |
| if envvar in self._environ: |
| del self._environ[envvar] |
| |
| def keys(self): |
| return self._environ.keys() |
| |
| def __iter__(self): |
| return iter(self._environ) |
| |
| def __len__(self): |
| return len(self._environ) |
| |
| def set(self, envvar, value): |
| self[envvar] = value |
| |
| def unset(self, envvar): |
| del self[envvar] |
| |
| def __enter__(self): |
| return self |
| |
| def __exit__(self, *ignore_exc): |
| for (k, v) in self._changed.items(): |
| if v is None: |
| if k in self._environ: |
| del self._environ[k] |
| else: |
| self._environ[k] = v |
| os.environ = self._environ |
| |
| |
| class DirsOnSysPath(object): |
| """Context manager to temporarily add directories to sys.path. |
| |
| This makes a copy of sys.path, appends any directories given |
| as positional arguments, then reverts sys.path to the copied |
| settings when the context ends. |
| |
| Note that *all* sys.path modifications in the body of the |
| context manager, including replacement of the object, |
| will be reverted at the end of the block. |
| """ |
| |
| def __init__(self, *paths): |
| self.original_value = sys.path[:] |
| self.original_object = sys.path |
| sys.path.extend(paths) |
| |
| def __enter__(self): |
| return self |
| |
| def __exit__(self, *ignore_exc): |
| sys.path = self.original_object |
| sys.path[:] = self.original_value |
| |
| |
| 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.items(): |
| if not hasattr(value, attr): |
| break |
| if getattr(value, attr) != attr_value: |
| break |
| else: |
| raise ResourceDenied("an optional resource is not available") |
| |
| # Context managers that raise ResourceDenied when various issues |
| # with the Internet connection manifest themselves as exceptions. |
| # XXX deprecate these and use transient_internet() instead |
| time_out = TransientResource(IOError, errno=errno.ETIMEDOUT) |
| socket_peer_reset = TransientResource(socket.error, errno=errno.ECONNRESET) |
| ioerror_peer_reset = TransientResource(IOError, errno=errno.ECONNRESET) |
| |
| |
| @contextlib.contextmanager |
| def transient_internet(resource_name, *, timeout=30.0, errnos=()): |
| """Return a context manager that raises ResourceDenied when various issues |
| with the Internet connection manifest themselves as exceptions.""" |
| default_errnos = [ |
| ('ECONNREFUSED', 111), |
| ('ECONNRESET', 104), |
| ('EHOSTUNREACH', 113), |
| ('ENETUNREACH', 101), |
| ('ETIMEDOUT', 110), |
| ] |
| default_gai_errnos = [ |
| ('EAI_AGAIN', -3), |
| ('EAI_FAIL', -4), |
| ('EAI_NONAME', -2), |
| ('EAI_NODATA', -5), |
| # Encountered when trying to resolve IPv6-only hostnames |
| ('WSANO_DATA', 11004), |
| ] |
| |
| denied = ResourceDenied("Resource %r is not available" % resource_name) |
| captured_errnos = errnos |
| gai_errnos = [] |
| if not captured_errnos: |
| captured_errnos = [getattr(errno, name, num) |
| for (name, num) in default_errnos] |
| gai_errnos = [getattr(socket, name, num) |
| for (name, num) in default_gai_errnos] |
| |
| def filter_error(err): |
| n = getattr(err, 'errno', None) |
| if (isinstance(err, socket.timeout) or |
| (isinstance(err, socket.gaierror) and n in gai_errnos) or |
| n in captured_errnos): |
| if not verbose: |
| sys.stderr.write(denied.args[0] + "\n") |
| raise denied from err |
| |
| old_timeout = socket.getdefaulttimeout() |
| try: |
| if timeout is not None: |
| socket.setdefaulttimeout(timeout) |
| yield |
| except IOError as err: |
| # urllib can wrap original socket errors multiple times (!), we must |
| # unwrap to get at the original error. |
| while True: |
| a = err.args |
| if len(a) >= 1 and isinstance(a[0], IOError): |
| err = a[0] |
| # The error can also be wrapped as args[1]: |
| # except socket.error as msg: |
| # raise IOError('socket error', msg).with_traceback(sys.exc_info()[2]) |
| elif len(a) >= 2 and isinstance(a[1], IOError): |
| err = a[1] |
| else: |
| break |
| filter_error(err) |
| raise |
| # XXX should we catch generic exceptions and look for their |
| # __cause__ or __context__? |
| finally: |
| socket.setdefaulttimeout(old_timeout) |
| |
| |
| @contextlib.contextmanager |
| def captured_output(stream_name): |
| """Return a context manager used by captured_stdout/stdin/stderr |
| that temporarily replaces the sys stream *stream_name* with a StringIO.""" |
| import io |
| orig_stdout = getattr(sys, stream_name) |
| setattr(sys, stream_name, io.StringIO()) |
| try: |
| yield getattr(sys, stream_name) |
| finally: |
| setattr(sys, stream_name, orig_stdout) |
| |
| def captured_stdout(): |
| """Capture the output of sys.stdout: |
| |
| with captured_stdout() as s: |
| print("hello") |
| self.assertEqual(s.getvalue(), "hello") |
| """ |
| return captured_output("stdout") |
| |
| def captured_stderr(): |
| return captured_output("stderr") |
| |
| def captured_stdin(): |
| return captured_output("stdin") |
| |
| |
| def gc_collect(): |
| """Force as many objects as possible to be collected. |
| |
| In non-CPython implementations of Python, this is needed because timely |
| deallocation is not guaranteed by the garbage collector. (Even in CPython |
| this can be the case in case of reference cycles.) This means that __del__ |
| methods may be called later than expected and weakrefs may remain alive for |
| longer than expected. This function tries its best to force all garbage |
| objects to disappear. |
| """ |
| gc.collect() |
| if is_jython: |
| time.sleep(0.1) |
| gc.collect() |
| gc.collect() |
| |
| @contextlib.contextmanager |
| def disable_gc(): |
| have_gc = gc.isenabled() |
| gc.disable() |
| try: |
| yield |
| finally: |
| if have_gc: |
| gc.enable() |
| |
| |
| def python_is_optimized(): |
| """Find if Python was built with optimizations.""" |
| cflags = sysconfig.get_config_var('PY_CFLAGS') or '' |
| final_opt = "" |
| for opt in cflags.split(): |
| if opt.startswith('-O'): |
| final_opt = opt |
| return final_opt != '' and final_opt != '-O0' |
| |
| |
| #======================================================================= |
| # 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.__name__ = func.__name__ |
| inner.__doc__ = func.__doc__ |
| return inner |
| return decorator |
| |
| #======================================================================= |
| # Decorator for running a function in a specific timezone, correctly |
| # resetting it afterwards. |
| |
| def run_with_tz(tz): |
| def decorator(func): |
| def inner(*args, **kwds): |
| try: |
| tzset = time.tzset |
| except AttributeError: |
| raise unittest.SkipTest("tzset required") |
| if 'TZ' in os.environ: |
| orig_tz = os.environ['TZ'] |
| else: |
| orig_tz = None |
| os.environ['TZ'] = tz |
| tzset() |
| |
| # now run the function, resetting the tz on exceptions |
| try: |
| return func(*args, **kwds) |
| finally: |
| if orig_tz == None: |
| del os.environ['TZ'] |
| else: |
| os.environ['TZ'] = orig_tz |
| time.tzset() |
| |
| inner.__name__ = 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 |
| _4G = 4 * _1G |
| |
| MAX_Py_ssize_t = sys.maxsize |
| |
| def set_memlimit(limit): |
| global max_memuse |
| global real_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()]) |
| real_max_memuse = memlimit |
| 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 |
| |
| class _MemoryWatchdog: |
| """An object which periodically watches the process' memory consumption |
| and prints it out. |
| """ |
| |
| def __init__(self): |
| self.procfile = '/proc/{pid}/statm'.format(pid=os.getpid()) |
| self.started = False |
| |
| def start(self): |
| try: |
| f = open(self.procfile, 'r') |
| except OSError as e: |
| warnings.warn('/proc not available for stats: {}'.format(e), |
| RuntimeWarning) |
| sys.stderr.flush() |
| return |
| |
| watchdog_script = findfile("memory_watchdog.py") |
| self.mem_watchdog = subprocess.Popen([sys.executable, watchdog_script], |
| stdin=f, stderr=subprocess.DEVNULL) |
| f.close() |
| self.started = True |
| |
| def stop(self): |
| if self.started: |
| self.mem_watchdog.terminate() |
| self.mem_watchdog.wait() |
| |
| |
| def bigmemtest(size, memuse, dry_run=True): |
| """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. |
| |
| if 'dry_run' is False, it means the test doesn't support dummy runs |
| when -M is not specified. |
| """ |
| def decorator(f): |
| def wrapper(self): |
| size = wrapper.size |
| memuse = wrapper.memuse |
| if not real_max_memuse: |
| maxsize = 5147 |
| else: |
| maxsize = size |
| |
| if ((real_max_memuse or not dry_run) |
| and real_max_memuse < maxsize * memuse): |
| raise unittest.SkipTest( |
| "not enough memory: %.1fG minimum needed" |
| % (size * memuse / (1024 ** 3))) |
| |
| if real_max_memuse and verbose: |
| print() |
| print(" ... expected peak memory use: {peak:.1f}G" |
| .format(peak=size * memuse / (1024 ** 3))) |
| watchdog = _MemoryWatchdog() |
| watchdog.start() |
| else: |
| watchdog = None |
| |
| try: |
| return f(self, maxsize) |
| finally: |
| if watchdog: |
| watchdog.stop() |
| |
| wrapper.size = size |
| wrapper.memuse = memuse |
| 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 MAX_Py_ssize_t >= 2**63 - 1 and max_memuse >= 2**31: |
| raise unittest.SkipTest( |
| "not enough memory: try a 32-bit build instead") |
| else: |
| raise unittest.SkipTest( |
| "not enough memory: %.1fG minimum needed" |
| % (MAX_Py_ssize_t / (1024 ** 3))) |
| else: |
| return f(self) |
| return wrapper |
| |
| #======================================================================= |
| # unittest integration. |
| |
| class BasicTestRunner: |
| def run(self, test): |
| result = unittest.TestResult() |
| test(result) |
| return result |
| |
| def _id(obj): |
| return obj |
| |
| def requires_resource(resource): |
| if resource == 'gui' and not _is_gui_available(): |
| return unittest.skip("resource 'gui' is not available") |
| if is_resource_enabled(resource): |
| return _id |
| else: |
| return unittest.skip("resource {0!r} is not enabled".format(resource)) |
| |
| def cpython_only(test): |
| """ |
| Decorator for tests only applicable on CPython. |
| """ |
| return impl_detail(cpython=True)(test) |
| |
| def impl_detail(msg=None, **guards): |
| if check_impl_detail(**guards): |
| return _id |
| if msg is None: |
| guardnames, default = _parse_guards(guards) |
| if default: |
| msg = "implementation detail not available on {0}" |
| else: |
| msg = "implementation detail specific to {0}" |
| guardnames = sorted(guardnames.keys()) |
| msg = msg.format(' or '.join(guardnames)) |
| return unittest.skip(msg) |
| |
| def _parse_guards(guards): |
| # Returns a tuple ({platform_name: run_me}, default_value) |
| if not guards: |
| return ({'cpython': True}, False) |
| is_true = list(guards.values())[0] |
| assert list(guards.values()) == [is_true] * len(guards) # all True or all False |
| return (guards, not is_true) |
| |
| # Use the following check to guard CPython's implementation-specific tests -- |
| # or to run them only on the implementation(s) guarded by the arguments. |
| def check_impl_detail(**guards): |
| """This function returns True or False depending on the host platform. |
| Examples: |
| if check_impl_detail(): # only on CPython (default) |
| if check_impl_detail(jython=True): # only on Jython |
| if check_impl_detail(cpython=False): # everywhere except on CPython |
| """ |
| guards, default = _parse_guards(guards) |
| return guards.get(platform.python_implementation().lower(), default) |
| |
| |
| def no_tracing(func): |
| """Decorator to temporarily turn off tracing for the duration of a test.""" |
| if not hasattr(sys, 'gettrace'): |
| return func |
| else: |
| @functools.wraps(func) |
| def wrapper(*args, **kwargs): |
| original_trace = sys.gettrace() |
| try: |
| sys.settrace(None) |
| return func(*args, **kwargs) |
| finally: |
| sys.settrace(original_trace) |
| return wrapper |
| |
| |
| def refcount_test(test): |
| """Decorator for tests which involve reference counting. |
| |
| To start, the decorator does not run the test if is not run by CPython. |
| After that, any trace function is unset during the test to prevent |
| unexpected refcounts caused by the trace function. |
| |
| """ |
| return no_tracing(cpython_only(test)) |
| |
| |
| def _filter_suite(suite, pred): |
| """Recursively filter test cases in a suite based on a predicate.""" |
| newtests = [] |
| for test in suite._tests: |
| if isinstance(test, unittest.TestSuite): |
| _filter_suite(test, pred) |
| newtests.append(test) |
| else: |
| if pred(test): |
| newtests.append(test) |
| suite._tests = newtests |
| |
| def _run_suite(suite): |
| """Run tests from a unittest.TestSuite-derived class.""" |
| if verbose: |
| runner = unittest.TextTestRunner(sys.stdout, verbosity=2, |
| failfast=failfast) |
| 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: |
| err = "multiple errors occurred" |
| if not verbose: err += "; run in verbose mode for details" |
| 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)) |
| def case_pred(test): |
| if match_tests is None: |
| return True |
| for name in test.id().split("."): |
| if fnmatch.fnmatchcase(name, match_tests): |
| return True |
| return False |
| _filter_suite(suite, case_pred) |
| _run_suite(suite) |
| |
| |
| #======================================================================= |
| # doctest driver. |
| |
| def run_doctest(module, verbosity=None, optionflags=0): |
| """Run doctest on the given module. Return (#failures, #tests). |
| |
| If optional argument verbosity is not specified (or is None), pass |
| 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 |
| |
| f, t = doctest.testmod(module, verbose=verbosity, optionflags=optionflags) |
| if f: |
| raise TestFailed("%d of %d doctests failed" % (f, t)) |
| if verbose: |
| print('doctest (%s) ... %d tests with zero failures' % |
| (module.__name__, t)) |
| return f, t |
| |
| |
| #======================================================================= |
| # Support for saving and restoring the imported modules. |
| |
| def modules_setup(): |
| return sys.modules.copy(), |
| |
| def modules_cleanup(oldmodules): |
| # Encoders/decoders are registered permanently within the internal |
| # codec cache. If we destroy the corresponding modules their |
| # globals will be set to None which will trip up the cached functions. |
| encodings = [(k, v) for k, v in sys.modules.items() |
| if k.startswith('encodings.')] |
| sys.modules.clear() |
| sys.modules.update(encodings) |
| # XXX: This kind of problem can affect more than just encodings. In particular |
| # extension modules (such as _ssl) don't cope with reloading properly. |
| # Really, test modules should be cleaning out the test specific modules they |
| # know they added (ala test_runpy) rather than relying on this function (as |
| # test_importhooks and test_pkg do currently). |
| # Implicitly imported *real* modules should be left alone (see issue 10556). |
| sys.modules.update(oldmodules) |
| |
| #======================================================================= |
| # Threading support to prevent reporting refleaks when running regrtest.py -R |
| |
| # NOTE: we use thread._count() rather than threading.enumerate() (or the |
| # moral equivalent thereof) because a threading.Thread object is still alive |
| # until its __bootstrap() method has returned, even after it has been |
| # unregistered from the threading module. |
| # thread._count(), on the other hand, only gets decremented *after* the |
| # __bootstrap() method has returned, which gives us reliable reference counts |
| # at the end of a test run. |
| |
| def threading_setup(): |
| if _thread: |
| return _thread._count(), threading._dangling.copy() |
| else: |
| return 1, () |
| |
| def threading_cleanup(*original_values): |
| if not _thread: |
| return |
| _MAX_COUNT = 10 |
| for count in range(_MAX_COUNT): |
| values = _thread._count(), threading._dangling |
| if values == original_values: |
| break |
| time.sleep(0.1) |
| gc_collect() |
| # XXX print a warning in case of failure? |
| |
| def reap_threads(func): |
| """Use this function when threads are being used. This will |
| ensure that the threads are cleaned up even when the test fails. |
| If threading is unavailable this function does nothing. |
| """ |
| if not _thread: |
| return func |
| |
| @functools.wraps(func) |
| def decorator(*args): |
| key = threading_setup() |
| try: |
| return func(*args) |
| finally: |
| threading_cleanup(*key) |
| return decorator |
| |
| 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 |
| |
| @contextlib.contextmanager |
| def swap_attr(obj, attr, new_val): |
| """Temporary swap out an attribute with a new object. |
| |
| Usage: |
| with swap_attr(obj, "attr", 5): |
| ... |
| |
| This will set obj.attr to 5 for the duration of the with: block, |
| restoring the old value at the end of the block. If `attr` doesn't |
| exist on `obj`, it will be created and then deleted at the end of the |
| block. |
| """ |
| if hasattr(obj, attr): |
| real_val = getattr(obj, attr) |
| setattr(obj, attr, new_val) |
| try: |
| yield |
| finally: |
| setattr(obj, attr, real_val) |
| else: |
| setattr(obj, attr, new_val) |
| try: |
| yield |
| finally: |
| delattr(obj, attr) |
| |
| @contextlib.contextmanager |
| def swap_item(obj, item, new_val): |
| """Temporary swap out an item with a new object. |
| |
| Usage: |
| with swap_item(obj, "item", 5): |
| ... |
| |
| This will set obj["item"] to 5 for the duration of the with: block, |
| restoring the old value at the end of the block. If `item` doesn't |
| exist on `obj`, it will be created and then deleted at the end of the |
| block. |
| """ |
| if item in obj: |
| real_val = obj[item] |
| obj[item] = new_val |
| try: |
| yield |
| finally: |
| obj[item] = real_val |
| else: |
| obj[item] = new_val |
| try: |
| yield |
| finally: |
| del obj[item] |
| |
| def strip_python_stderr(stderr): |
| """Strip the stderr of a Python process from potential debug output |
| emitted by the interpreter. |
| |
| This will typically be run on the result of the communicate() method |
| of a subprocess.Popen object. |
| """ |
| stderr = re.sub(br"\[\d+ refs\]\r?\n?", b"", stderr).strip() |
| return stderr |
| |
| def args_from_interpreter_flags(): |
| """Return a list of command-line arguments reproducing the current |
| settings in sys.flags and sys.warnoptions.""" |
| return subprocess._args_from_interpreter_flags() |
| |
| #============================================================ |
| # Support for assertions about logging. |
| #============================================================ |
| |
| class TestHandler(logging.handlers.BufferingHandler): |
| def __init__(self, matcher): |
| # BufferingHandler takes a "capacity" argument |
| # so as to know when to flush. As we're overriding |
| # shouldFlush anyway, we can set a capacity of zero. |
| # You can call flush() manually to clear out the |
| # buffer. |
| logging.handlers.BufferingHandler.__init__(self, 0) |
| self.matcher = matcher |
| |
| def shouldFlush(self): |
| return False |
| |
| def emit(self, record): |
| self.format(record) |
| self.buffer.append(record.__dict__) |
| |
| def matches(self, **kwargs): |
| """ |
| Look for a saved dict whose keys/values match the supplied arguments. |
| """ |
| result = False |
| for d in self.buffer: |
| if self.matcher.matches(d, **kwargs): |
| result = True |
| break |
| return result |
| |
| class Matcher(object): |
| |
| _partial_matches = ('msg', 'message') |
| |
| def matches(self, d, **kwargs): |
| """ |
| Try to match a single dict with the supplied arguments. |
| |
| Keys whose values are strings and which are in self._partial_matches |
| will be checked for partial (i.e. substring) matches. You can extend |
| this scheme to (for example) do regular expression matching, etc. |
| """ |
| result = True |
| for k in kwargs: |
| v = kwargs[k] |
| dv = d.get(k) |
| if not self.match_value(k, dv, v): |
| result = False |
| break |
| return result |
| |
| def match_value(self, k, dv, v): |
| """ |
| Try to match a single stored value (dv) with a supplied value (v). |
| """ |
| if type(v) != type(dv): |
| result = False |
| elif type(dv) is not str or k not in self._partial_matches: |
| result = (v == dv) |
| else: |
| result = dv.find(v) >= 0 |
| return result |
| |
| |
| _can_symlink = None |
| def can_symlink(): |
| global _can_symlink |
| if _can_symlink is not None: |
| return _can_symlink |
| symlink_path = TESTFN + "can_symlink" |
| try: |
| os.symlink(TESTFN, symlink_path) |
| can = True |
| except (OSError, NotImplementedError, AttributeError): |
| can = False |
| else: |
| os.remove(symlink_path) |
| _can_symlink = can |
| return can |
| |
| def skip_unless_symlink(test): |
| """Skip decorator for tests that require functional symlink""" |
| ok = can_symlink() |
| msg = "Requires functional symlink implementation" |
| return test if ok else unittest.skip(msg)(test) |
| |
| _can_xattr = None |
| def can_xattr(): |
| global _can_xattr |
| if _can_xattr is not None: |
| return _can_xattr |
| if not hasattr(os, "setxattr"): |
| can = False |
| else: |
| tmp_fp, tmp_name = tempfile.mkstemp() |
| try: |
| with open(TESTFN, "wb") as fp: |
| try: |
| # TESTFN & tempfile may use different file systems with |
| # different capabilities |
| os.setxattr(tmp_fp, b"user.test", b"") |
| os.setxattr(fp.fileno(), b"user.test", b"") |
| # Kernels < 2.6.39 don't respect setxattr flags. |
| kernel_version = platform.release() |
| m = re.match("2.6.(\d{1,2})", kernel_version) |
| can = m is None or int(m.group(1)) >= 39 |
| except OSError: |
| can = False |
| finally: |
| unlink(TESTFN) |
| unlink(tmp_name) |
| _can_xattr = can |
| return can |
| |
| def skip_unless_xattr(test): |
| """Skip decorator for tests that require functional extended attributes""" |
| ok = can_xattr() |
| msg = "no non-broken extended attribute support" |
| return test if ok else unittest.skip(msg)(test) |
| |
| def patch(test_instance, object_to_patch, attr_name, new_value): |
| """Override 'object_to_patch'.'attr_name' with 'new_value'. |
| |
| Also, add a cleanup procedure to 'test_instance' to restore |
| 'object_to_patch' value for 'attr_name'. |
| The 'attr_name' should be a valid attribute for 'object_to_patch'. |
| |
| """ |
| # check that 'attr_name' is a real attribute for 'object_to_patch' |
| # will raise AttributeError if it does not exist |
| getattr(object_to_patch, attr_name) |
| |
| # keep a copy of the old value |
| attr_is_local = False |
| try: |
| old_value = object_to_patch.__dict__[attr_name] |
| except (AttributeError, KeyError): |
| old_value = getattr(object_to_patch, attr_name, None) |
| else: |
| attr_is_local = True |
| |
| # restore the value when the test is done |
| def cleanup(): |
| if attr_is_local: |
| setattr(object_to_patch, attr_name, old_value) |
| else: |
| delattr(object_to_patch, attr_name) |
| |
| test_instance.addCleanup(cleanup) |
| |
| # actually override the attribute |
| setattr(object_to_patch, attr_name, new_value) |