/usr/share/pyshared/nose/loader.py is in python-nose 1.1.2-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 | """
Test Loader
-----------
nose's test loader implements the same basic functionality as its
superclass, unittest.TestLoader, but extends it by more liberal
interpretations of what may be a test and how a test may be named.
"""
from __future__ import generators
import logging
import os
import sys
import unittest
import types
from inspect import isfunction
from nose.pyversion import unbound_method, ismethod
from nose.case import FunctionTestCase, MethodTestCase
from nose.failure import Failure
from nose.config import Config
from nose.importer import Importer, add_path, remove_path
from nose.selector import defaultSelector, TestAddress
from nose.util import func_lineno, getpackage, isclass, isgenerator, \
ispackage, regex_last_key, resolve_name, transplant_func, \
transplant_class, test_address
from nose.suite import ContextSuiteFactory, ContextList, LazySuite
from nose.pyversion import sort_list, cmp_to_key
log = logging.getLogger(__name__)
#log.setLevel(logging.DEBUG)
# for efficiency and easier mocking
op_normpath = os.path.normpath
op_abspath = os.path.abspath
op_join = os.path.join
op_isdir = os.path.isdir
op_isfile = os.path.isfile
__all__ = ['TestLoader', 'defaultTestLoader']
class TestLoader(unittest.TestLoader):
"""Test loader that extends unittest.TestLoader to:
* Load tests from test-like functions and classes that are not
unittest.TestCase subclasses
* Find and load test modules in a directory
* Support tests that are generators
* Support easy extensions of or changes to that behavior through plugins
"""
config = None
importer = None
workingDir = None
selector = None
suiteClass = None
def __init__(self, config=None, importer=None, workingDir=None,
selector=None):
"""Initialize a test loader.
Parameters (all optional):
* config: provide a `nose.config.Config`_ or other config class
instance; if not provided a `nose.config.Config`_ with
default values is used.
* importer: provide an importer instance that implements
`importFromPath`. If not provided, a
`nose.importer.Importer`_ is used.
* workingDir: the directory to which file and module names are
relative. If not provided, assumed to be the current working
directory.
* selector: a selector class or instance. If a class is
provided, it will be instantiated with one argument, the
current config. If not provided, a `nose.selector.Selector`_
is used.
"""
if config is None:
config = Config()
if importer is None:
importer = Importer(config=config)
if workingDir is None:
workingDir = config.workingDir
if selector is None:
selector = defaultSelector(config)
elif isclass(selector):
selector = selector(config)
self.config = config
self.importer = importer
self.workingDir = op_normpath(op_abspath(workingDir))
self.selector = selector
if config.addPaths:
add_path(workingDir, config)
self.suiteClass = ContextSuiteFactory(config=config)
unittest.TestLoader.__init__(self)
def getTestCaseNames(self, testCaseClass):
"""Override to select with selector, unless
config.getTestCaseNamesCompat is True
"""
if self.config.getTestCaseNamesCompat:
return unittest.TestLoader.getTestCaseNames(self, testCaseClass)
def wanted(attr, cls=testCaseClass, sel=self.selector):
item = getattr(cls, attr, None)
if isfunction(item):
item = unbound_method(cls, item)
elif not ismethod(item):
return False
return sel.wantMethod(item)
cases = filter(wanted, dir(testCaseClass))
for base in testCaseClass.__bases__:
for case in self.getTestCaseNames(base):
if case not in cases:
cases.append(case)
# add runTest if nothing else picked
if not cases and hasattr(testCaseClass, 'runTest'):
cases = ['runTest']
if self.sortTestMethodsUsing:
sort_list(cases, cmp_to_key(self.sortTestMethodsUsing))
return cases
def loadTestsFromDir(self, path):
"""Load tests from the directory at path. This is a generator
-- each suite of tests from a module or other file is yielded
and is expected to be executed before the next file is
examined.
"""
log.debug("load from dir %s", path)
plugins = self.config.plugins
plugins.beforeDirectory(path)
if self.config.addPaths:
paths_added = add_path(path, self.config)
entries = os.listdir(path)
sort_list(entries, regex_last_key(self.config.testMatch))
for entry in entries:
# this hard-coded initial-dot test will be removed:
# http://code.google.com/p/python-nose/issues/detail?id=82
if entry.startswith('.'):
continue
entry_path = op_abspath(op_join(path, entry))
is_file = op_isfile(entry_path)
wanted = False
if is_file:
is_dir = False
wanted = self.selector.wantFile(entry_path)
else:
is_dir = op_isdir(entry_path)
if is_dir:
# this hard-coded initial-underscore test will be removed:
# http://code.google.com/p/python-nose/issues/detail?id=82
if entry.startswith('_'):
continue
wanted = self.selector.wantDirectory(entry_path)
is_package = ispackage(entry_path)
if wanted:
if is_file:
plugins.beforeContext()
if entry.endswith('.py'):
yield self.loadTestsFromName(
entry_path, discovered=True)
else:
yield self.loadTestsFromFile(entry_path)
plugins.afterContext()
elif is_package:
# Load the entry as a package: given the full path,
# loadTestsFromName() will figure it out
yield self.loadTestsFromName(
entry_path, discovered=True)
else:
# Another test dir in this one: recurse lazily
yield self.suiteClass(
lambda: self.loadTestsFromDir(entry_path))
tests = []
for test in plugins.loadTestsFromDir(path):
tests.append(test)
# TODO: is this try/except needed?
try:
if tests:
yield self.suiteClass(tests)
except (KeyboardInterrupt, SystemExit):
raise
except:
yield self.suiteClass([Failure(*sys.exc_info())])
# pop paths
if self.config.addPaths:
for p in paths_added:
remove_path(p)
plugins.afterDirectory(path)
def loadTestsFromFile(self, filename):
"""Load tests from a non-module file. Default is to raise a
ValueError; plugins may implement `loadTestsFromFile` to
provide a list of tests loaded from the file.
"""
log.debug("Load from non-module file %s", filename)
try:
tests = [test for test in
self.config.plugins.loadTestsFromFile(filename)]
if tests:
# Plugins can yield False to indicate that they were
# unable to load tests from a file, but it was not an
# error -- the file just had no tests to load.
tests = filter(None, tests)
return self.suiteClass(tests)
else:
# Nothing was able to even try to load from this file
open(filename, 'r').close() # trigger os error
raise ValueError("Unable to load tests from file %s"
% filename)
except (KeyboardInterrupt, SystemExit):
raise
except:
exc = sys.exc_info()
return self.suiteClass(
[Failure(exc[0], exc[1], exc[2],
address=(filename, None, None))])
def loadTestsFromGenerator(self, generator, module):
"""Lazy-load tests from a generator function. The generator function
may yield either:
* a callable, or
* a function name resolvable within the same module
"""
def generate(g=generator, m=module):
try:
for test in g():
test_func, arg = self.parseGeneratedTest(test)
if not callable(test_func):
test_func = getattr(m, test_func)
yield FunctionTestCase(test_func, arg=arg, descriptor=g)
except KeyboardInterrupt:
raise
except:
exc = sys.exc_info()
yield Failure(exc[0], exc[1], exc[2],
address=test_address(generator))
return self.suiteClass(generate, context=generator, can_split=False)
def loadTestsFromGeneratorMethod(self, generator, cls):
"""Lazy-load tests from a generator method.
This is more complicated than loading from a generator function,
since a generator method may yield:
* a function
* a bound or unbound method, or
* a method name
"""
# convert the unbound generator method
# into a bound method so it can be called below
if hasattr(generator, 'im_class'):
cls = generator.im_class
inst = cls()
method = generator.__name__
generator = getattr(inst, method)
def generate(g=generator, c=cls):
try:
for test in g():
test_func, arg = self.parseGeneratedTest(test)
if not callable(test_func):
test_func = unbound_method(c, getattr(c, test_func))
if ismethod(test_func):
yield MethodTestCase(test_func, arg=arg, descriptor=g)
elif isfunction(test_func):
# In this case we're forcing the 'MethodTestCase'
# to run the inline function as its test call,
# but using the generator method as the 'method of
# record' (so no need to pass it as the descriptor)
yield MethodTestCase(g, test=test_func, arg=arg)
else:
yield Failure(
TypeError,
"%s is not a function or method" % test_func)
except KeyboardInterrupt:
raise
except:
exc = sys.exc_info()
yield Failure(exc[0], exc[1], exc[2],
address=test_address(generator))
return self.suiteClass(generate, context=generator, can_split=False)
def loadTestsFromModule(self, module, path=None, discovered=False):
"""Load all tests from module and return a suite containing
them. If the module has been discovered and is not test-like,
the suite will be empty by default, though plugins may add
their own tests.
"""
log.debug("Load from module %s", module)
tests = []
test_classes = []
test_funcs = []
# For *discovered* modules, we only load tests when the module looks
# testlike. For modules we've been directed to load, we always
# look for tests. (discovered is set to True by loadTestsFromDir)
if not discovered or self.selector.wantModule(module):
for item in dir(module):
test = getattr(module, item, None)
# print "Check %s (%s) in %s" % (item, test, module.__name__)
if isclass(test):
if self.selector.wantClass(test):
test_classes.append(test)
elif isfunction(test) and self.selector.wantFunction(test):
test_funcs.append(test)
sort_list(test_classes, lambda x: x.__name__)
sort_list(test_funcs, func_lineno)
tests = map(lambda t: self.makeTest(t, parent=module),
test_classes + test_funcs)
# Now, descend into packages
# FIXME can or should this be lazy?
# is this syntax 2.2 compatible?
module_paths = getattr(module, '__path__', [])
if path:
path = os.path.realpath(path)
for module_path in module_paths:
log.debug("Load tests from module path %s?", module_path)
log.debug("path: %s os.path.realpath(%s): %s",
path, module_path, os.path.realpath(module_path))
if (self.config.traverseNamespace or not path) or \
os.path.realpath(module_path).startswith(path):
tests.extend(self.loadTestsFromDir(module_path))
for test in self.config.plugins.loadTestsFromModule(module, path):
tests.append(test)
return self.suiteClass(ContextList(tests, context=module))
def loadTestsFromName(self, name, module=None, discovered=False):
"""Load tests from the entity with the given name.
The name may indicate a file, directory, module, or any object
within a module. See `nose.util.split_test_name` for details on
test name parsing.
"""
# FIXME refactor this method into little bites?
log.debug("load from %s (%s)", name, module)
suite = self.suiteClass
# give plugins first crack
plug_tests = self.config.plugins.loadTestsFromName(name, module)
if plug_tests:
return suite(plug_tests)
addr = TestAddress(name, workingDir=self.workingDir)
if module:
# Two cases:
# name is class.foo
# The addr will be incorrect, since it thinks class.foo is
# a dotted module name. It's actually a dotted attribute
# name. In this case we want to use the full submitted
# name as the name to load from the module.
# name is module:class.foo
# The addr will be correct. The part we want is the part after
# the :, which is in addr.call.
if addr.call:
name = addr.call
parent, obj = self.resolve(name, module)
if (isclass(parent)
and getattr(parent, '__module__', None) != module.__name__):
parent = transplant_class(parent, module.__name__)
obj = getattr(parent, obj.__name__)
log.debug("parent %s obj %s module %s", parent, obj, module)
if isinstance(obj, Failure):
return suite([obj])
else:
return suite(ContextList([self.makeTest(obj, parent)],
context=parent))
else:
if addr.module:
try:
if addr.filename is None:
module = resolve_name(addr.module)
else:
self.config.plugins.beforeImport(
addr.filename, addr.module)
# FIXME: to support module.name names,
# do what resolve-name does and keep trying to
# import, popping tail of module into addr.call,
# until we either get an import or run out of
# module parts
try:
module = self.importer.importFromPath(
addr.filename, addr.module)
finally:
self.config.plugins.afterImport(
addr.filename, addr.module)
except (KeyboardInterrupt, SystemExit):
raise
except:
exc = sys.exc_info()
return suite([Failure(exc[0], exc[1], exc[2],
address=addr.totuple())])
if addr.call:
return self.loadTestsFromName(addr.call, module)
else:
return self.loadTestsFromModule(
module, addr.filename,
discovered=discovered)
elif addr.filename:
path = addr.filename
if addr.call:
package = getpackage(path)
if package is None:
return suite([
Failure(ValueError,
"Can't find callable %s in file %s: "
"file is not a python module" %
(addr.call, path),
address=addr.totuple())])
return self.loadTestsFromName(addr.call, module=package)
else:
if op_isdir(path):
# In this case we *can* be lazy since we know
# that each module in the dir will be fully
# loaded before its tests are executed; we
# also know that we're not going to be asked
# to load from . and ./some_module.py *as part
# of this named test load*
return LazySuite(
lambda: self.loadTestsFromDir(path))
elif op_isfile(path):
return self.loadTestsFromFile(path)
else:
return suite([
Failure(OSError, "No such file %s" % path,
address=addr.totuple())])
else:
# just a function? what to do? I think it can only be
# handled when module is not None
return suite([
Failure(ValueError, "Unresolvable test name %s" % name,
address=addr.totuple())])
def loadTestsFromNames(self, names, module=None):
"""Load tests from all names, returning a suite containing all
tests.
"""
plug_res = self.config.plugins.loadTestsFromNames(names, module)
if plug_res:
suite, names = plug_res
if suite:
return self.suiteClass([
self.suiteClass(suite),
unittest.TestLoader.loadTestsFromNames(self, names, module)
])
return unittest.TestLoader.loadTestsFromNames(self, names, module)
def loadTestsFromTestCase(self, testCaseClass):
"""Load tests from a unittest.TestCase subclass.
"""
cases = []
plugins = self.config.plugins
for case in plugins.loadTestsFromTestCase(testCaseClass):
cases.append(case)
# For efficiency in the most common case, just call and return from
# super. This avoids having to extract cases and rebuild a context
# suite when there are no plugin-contributed cases.
if not cases:
return super(TestLoader, self).loadTestsFromTestCase(testCaseClass)
cases.extend(
[case for case in
super(TestLoader, self).loadTestsFromTestCase(testCaseClass)])
return self.suiteClass(cases)
def loadTestsFromTestClass(self, cls):
"""Load tests from a test class that is *not* a unittest.TestCase
subclass.
In this case, we can't depend on the class's `__init__` taking method
name arguments, so we have to compose a MethodTestCase for each
method in the class that looks testlike.
"""
def wanted(attr, cls=cls, sel=self.selector):
item = getattr(cls, attr, None)
if isfunction(item):
item = unbound_method(cls, item)
elif not ismethod(item):
return False
return sel.wantMethod(item)
cases = [self.makeTest(getattr(cls, case), cls)
for case in filter(wanted, dir(cls))]
for test in self.config.plugins.loadTestsFromTestClass(cls):
cases.append(test)
return self.suiteClass(ContextList(cases, context=cls))
def makeTest(self, obj, parent=None):
try:
return self._makeTest(obj, parent)
except (KeyboardInterrupt, SystemExit):
raise
except:
exc = sys.exc_info()
try:
addr = test_address(obj)
except KeyboardInterrupt:
raise
except:
addr = None
return Failure(exc[0], exc[1], exc[2], address=addr)
def _makeTest(self, obj, parent=None):
"""Given a test object and its parent, return a test case
or test suite.
"""
plug_tests = []
try:
addr = test_address(obj)
except KeyboardInterrupt:
raise
except:
addr = None
for test in self.config.plugins.makeTest(obj, parent):
plug_tests.append(test)
# TODO: is this try/except needed?
try:
if plug_tests:
return self.suiteClass(plug_tests)
except (KeyboardInterrupt, SystemExit):
raise
except:
exc = sys.exc_info()
return Failure(exc[0], exc[1], exc[2], address=addr)
if isfunction(obj) and parent and not isinstance(parent, types.ModuleType):
# This is a Python 3.x 'unbound method'. Wrap it with its
# associated class..
obj = unbound_method(parent, obj)
if isinstance(obj, unittest.TestCase):
return obj
elif isclass(obj):
if parent and obj.__module__ != parent.__name__:
obj = transplant_class(obj, parent.__name__)
if issubclass(obj, unittest.TestCase):
return self.loadTestsFromTestCase(obj)
else:
return self.loadTestsFromTestClass(obj)
elif ismethod(obj):
if parent is None:
parent = obj.__class__
if issubclass(parent, unittest.TestCase):
return parent(obj.__name__)
else:
if isgenerator(obj):
return self.loadTestsFromGeneratorMethod(obj, parent)
else:
return MethodTestCase(obj)
elif isfunction(obj):
if parent and obj.__module__ != parent.__name__:
obj = transplant_func(obj, parent.__name__)
if isgenerator(obj):
return self.loadTestsFromGenerator(obj, parent)
else:
return FunctionTestCase(obj)
else:
return Failure(TypeError,
"Can't make a test from %s" % obj,
address=addr)
def resolve(self, name, module):
"""Resolve name within module
"""
obj = module
parts = name.split('.')
for part in parts:
parent, obj = obj, getattr(obj, part, None)
if obj is None:
# no such test
obj = Failure(ValueError, "No such test %s" % name)
return parent, obj
def parseGeneratedTest(self, test):
"""Given the yield value of a test generator, return a func and args.
This is used in the two loadTestsFromGenerator* methods.
"""
if not isinstance(test, tuple): # yield test
test_func, arg = (test, tuple())
elif len(test) == 1: # yield (test,)
test_func, arg = (test[0], tuple())
else: # yield test, foo, bar, ...
assert len(test) > 1 # sanity check
test_func, arg = (test[0], test[1:])
return test_func, arg
defaultTestLoader = TestLoader
|