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# -*- test-case-name: twisted.trial.test.test_runner -*-
# Copyright (c) 2001-2010 Twisted Matrix Laboratories.
# See LICENSE for details.
"""
A miscellany of code used to run Trial tests.
Maintainer: Jonathan Lange
"""
import pdb
import os, types, warnings, sys, inspect, imp
import random, doctest, time
from twisted.python import reflect, log, failure, modules, filepath
from twisted.python.compat import set
from twisted.python.lockfile import FilesystemLock
from twisted.internet import defer
from twisted.trial import util, unittest
from twisted.trial.itrial import ITestCase
from twisted.trial.reporter import UncleanWarningsReporterWrapper
# These are imported so that they remain in the public API for t.trial.runner
from twisted.trial.unittest import suiteVisit, TestSuite
from zope.interface import implements
pyunit = __import__('unittest')
class _WorkingDirectoryBusy(Exception):
"""
A working directory was specified to the runner, but another test run is
currently using that directory.
"""
class _NoTrialMarker(Exception):
"""
No trial marker file could be found.
Raised when trial attempts to remove a trial temporary working directory
that does not contain a marker file.
"""
def isPackage(module):
"""Given an object return True if the object looks like a package"""
if not isinstance(module, types.ModuleType):
return False
basename = os.path.splitext(os.path.basename(module.__file__))[0]
return basename == '__init__'
def isPackageDirectory(dirname):
"""Is the directory at path 'dirname' a Python package directory?
Returns the name of the __init__ file (it may have a weird extension)
if dirname is a package directory. Otherwise, returns False"""
for ext in zip(*imp.get_suffixes())[0]:
initFile = '__init__' + ext
if os.path.exists(os.path.join(dirname, initFile)):
return initFile
return False
def samefile(filename1, filename2):
"""
A hacky implementation of C{os.path.samefile}. Used by L{filenameToModule}
when the platform doesn't provide C{os.path.samefile}. Do not use this.
"""
return os.path.abspath(filename1) == os.path.abspath(filename2)
def filenameToModule(fn):
"""
Given a filename, do whatever possible to return a module object matching
that file.
If the file in question is a module in Python path, properly import and
return that module. Otherwise, load the source manually.
@param fn: A filename.
@return: A module object.
@raise ValueError: If C{fn} does not exist.
"""
if not os.path.exists(fn):
raise ValueError("%r doesn't exist" % (fn,))
try:
ret = reflect.namedAny(reflect.filenameToModuleName(fn))
except (ValueError, AttributeError):
# Couldn't find module. The file 'fn' is not in PYTHONPATH
return _importFromFile(fn)
# ensure that the loaded module matches the file
retFile = os.path.splitext(ret.__file__)[0] + '.py'
# not all platforms (e.g. win32) have os.path.samefile
same = getattr(os.path, 'samefile', samefile)
if os.path.isfile(fn) and not same(fn, retFile):
del sys.modules[ret.__name__]
ret = _importFromFile(fn)
return ret
def _importFromFile(fn, moduleName=None):
fn = _resolveDirectory(fn)
if not moduleName:
moduleName = os.path.splitext(os.path.split(fn)[-1])[0]
if moduleName in sys.modules:
return sys.modules[moduleName]
fd = open(fn, 'r')
try:
module = imp.load_source(moduleName, fn, fd)
finally:
fd.close()
return module
def _resolveDirectory(fn):
if os.path.isdir(fn):
initFile = isPackageDirectory(fn)
if initFile:
fn = os.path.join(fn, initFile)
else:
raise ValueError('%r is not a package directory' % (fn,))
return fn
class DestructiveTestSuite(TestSuite):
"""
A test suite which remove the tests once run, to minimize memory usage.
"""
def run(self, result):
"""
Almost the same as L{TestSuite.run}, but with C{self._tests} being
empty at the end.
"""
while self._tests:
if result.shouldStop:
break
test = self._tests.pop(0)
test(result)
return result
# When an error occurs outside of any test, the user will see this string
# in place of a test's name.
NOT_IN_TEST = "<not in test>"
class LoggedSuite(TestSuite):
"""
Any errors logged in this suite will be reported to the L{TestResult}
object.
"""
def run(self, result):
"""
Run the suite, storing all errors in C{result}. If an error is logged
while no tests are running, then it will be added as an error to
C{result}.
@param result: A L{TestResult} object.
"""
observer = unittest._logObserver
observer._add()
super(LoggedSuite, self).run(result)
observer._remove()
for error in observer.getErrors():
result.addError(TestHolder(NOT_IN_TEST), error)
observer.flushErrors()
class DocTestSuite(TestSuite):
"""
DEPRECATED in Twisted 8.0.
Behaves like doctest.DocTestSuite, but decorates individual TestCases so
they support visit and so that id() behaviour is meaningful and consistent
between Python versions.
"""
def __init__(self, testModule):
warnings.warn("DocTestSuite is deprecated in Twisted 8.0.",
category=DeprecationWarning, stacklevel=2)
TestSuite.__init__(self)
suite = doctest.DocTestSuite(testModule)
for test in suite._tests: #yay encapsulation
self.addTest(ITestCase(test))
class PyUnitTestCase(object):
"""
DEPRECATED in Twisted 8.0.
This class decorates the pyunit.TestCase class, mainly to work around the
differences between unittest in Python 2.3, 2.4, and 2.5. These
differences are::
- The way doctest unittests describe themselves
- Where the implementation of TestCase.run is (used to be in __call__)
- Where the test method name is kept (mangled-private or non-mangled
private variable)
It also implements visit, which we like.
"""
def __init__(self, test):
warnings.warn("Deprecated in Twisted 8.0.",
category=DeprecationWarning)
self._test = test
test.id = self.id
def id(self):
cls = self._test.__class__
tmn = getattr(self._test, '_TestCase__testMethodName', None)
if tmn is None:
# python2.5's 'unittest' module is more sensible; but different.
tmn = self._test._testMethodName
return (cls.__module__ + '.' + cls.__name__ + '.' +
tmn)
def __repr__(self):
return 'PyUnitTestCase<%r>'%(self.id(),)
def __call__(self, results):
return self._test(results)
def visit(self, visitor):
"""
Call the given visitor with the original, standard library, test case
that C{self} wraps. See L{unittest.TestCase.visit}.
Deprecated in Twisted 8.0.
"""
warnings.warn("Test visitors deprecated in Twisted 8.0",
category=DeprecationWarning)
visitor(self._test)
def __getattr__(self, name):
return getattr(self._test, name)
class DocTestCase(PyUnitTestCase):
"""
DEPRECATED in Twisted 8.0.
"""
def id(self):
"""
In Python 2.4, doctests have correct id() behaviour. In Python 2.3,
id() returns 'runit'.
Here we override id() so that at least it will always contain the
fully qualified Python name of the doctest.
"""
return self._test.shortDescription()
class TrialSuite(TestSuite):
"""
Suite to wrap around every single test in a C{trial} run. Used internally
by Trial to set up things necessary for Trial tests to work, regardless of
what context they are run in.
"""
def __init__(self, tests=()):
suite = LoggedSuite(tests)
super(TrialSuite, self).__init__([suite])
def _bail(self):
from twisted.internet import reactor
d = defer.Deferred()
reactor.addSystemEventTrigger('after', 'shutdown',
lambda: d.callback(None))
reactor.fireSystemEvent('shutdown') # radix's suggestion
# As long as TestCase does crap stuff with the reactor we need to
# manually shutdown the reactor here, and that requires util.wait
# :(
# so that the shutdown event completes
unittest.TestCase('mktemp')._wait(d)
def run(self, result):
try:
TestSuite.run(self, result)
finally:
self._bail()
def name(thing):
"""
@param thing: an object from modules (instance of PythonModule,
PythonAttribute), a TestCase subclass, or an instance of a TestCase.
"""
if isTestCase(thing):
# TestCase subclass
theName = reflect.qual(thing)
else:
# thing from trial, or thing from modules.
# this monstrosity exists so that modules' objects do not have to
# implement id(). -jml
try:
theName = thing.id()
except AttributeError:
theName = thing.name
return theName
def isTestCase(obj):
"""
Returns C{True} if C{obj} is a class that contains test cases, C{False}
otherwise. Used to find all the tests in a module.
"""
try:
return issubclass(obj, pyunit.TestCase)
except TypeError:
return False
class TestHolder(object):
"""
Placeholder for a L{TestCase} inside a reporter. As far as a L{TestResult}
is concerned, this looks exactly like a unit test.
"""
implements(ITestCase)
failureException = None
def __init__(self, description):
"""
@param description: A string to be displayed L{TestResult}.
"""
self.description = description
def __call__(self, result):
return self.run(result)
def id(self):
return self.description
def countTestCases(self):
return 0
def run(self, result):
"""
This test is just a placeholder. Run the test successfully.
@param result: The C{TestResult} to store the results in.
@type result: L{twisted.trial.itrial.ITestResult}.
"""
result.startTest(self)
result.addSuccess(self)
result.stopTest(self)
def shortDescription(self):
return self.description
class ErrorHolder(TestHolder):
"""
Used to insert arbitrary errors into a test suite run. Provides enough
methods to look like a C{TestCase}, however, when it is run, it simply adds
an error to the C{TestResult}. The most common use-case is for when a
module fails to import.
"""
def __init__(self, description, error):
"""
@param description: A string used by C{TestResult}s to identify this
error. Generally, this is the name of a module that failed to import.
@param error: The error to be added to the result. Can be an exc_info
tuple or a L{twisted.python.failure.Failure}.
"""
super(ErrorHolder, self).__init__(description)
self.error = error
def __repr__(self):
return "<ErrorHolder description=%r error=%r>" % (self.description,
self.error)
def run(self, result):
"""
Run the test, reporting the error.
@param result: The C{TestResult} to store the results in.
@type result: L{twisted.trial.itrial.ITestResult}.
"""
result.startTest(self)
result.addError(self, util.excInfoOrFailureToExcInfo(self.error))
result.stopTest(self)
def visit(self, visitor):
"""
See L{unittest.TestCase.visit}.
"""
visitor(self)
class TestLoader(object):
"""
I find tests inside function, modules, files -- whatever -- then return
them wrapped inside a Test (either a L{TestSuite} or a L{TestCase}).
@ivar methodPrefix: A string prefix. C{TestLoader} will assume that all the
methods in a class that begin with C{methodPrefix} are test cases.
@ivar modulePrefix: A string prefix. Every module in a package that begins
with C{modulePrefix} is considered a module full of tests.
@ivar forceGarbageCollection: A flag applied to each C{TestCase} loaded.
See L{unittest.TestCase} for more information.
@ivar sorter: A key function used to sort C{TestCase}s, test classes,
modules and packages.
@ivar suiteFactory: A callable which is passed a list of tests (which
themselves may be suites of tests). Must return a test suite.
"""
methodPrefix = 'test'
modulePrefix = 'test_'
def __init__(self):
self.suiteFactory = TestSuite
self.sorter = name
self._importErrors = []
def sort(self, xs):
"""
Sort the given things using L{sorter}.
@param xs: A list of test cases, class or modules.
"""
return sorted(xs, key=self.sorter)
def findTestClasses(self, module):
"""Given a module, return all Trial test classes"""
classes = []
for name, val in inspect.getmembers(module):
if isTestCase(val):
classes.append(val)
return self.sort(classes)
def findByName(self, name):
"""
Return a Python object given a string describing it.
@param name: a string which may be either a filename or a
fully-qualified Python name.
@return: If C{name} is a filename, return the module. If C{name} is a
fully-qualified Python name, return the object it refers to.
"""
if os.path.exists(name):
return filenameToModule(name)
return reflect.namedAny(name)
def loadModule(self, module):
"""
Return a test suite with all the tests from a module.
Included are TestCase subclasses and doctests listed in the module's
__doctests__ module. If that's not good for you, put a function named
either C{testSuite} or C{test_suite} in your module that returns a
TestSuite, and I'll use the results of that instead.
If C{testSuite} and C{test_suite} are both present, then I'll use
C{testSuite}.
"""
## XXX - should I add an optional parameter to disable the check for
## a custom suite.
## OR, should I add another method
if not isinstance(module, types.ModuleType):
raise TypeError("%r is not a module" % (module,))
if hasattr(module, 'testSuite'):
return module.testSuite()
elif hasattr(module, 'test_suite'):
return module.test_suite()
suite = self.suiteFactory()
for testClass in self.findTestClasses(module):
suite.addTest(self.loadClass(testClass))
if not hasattr(module, '__doctests__'):
return suite
docSuite = self.suiteFactory()
for doctest in module.__doctests__:
docSuite.addTest(self.loadDoctests(doctest))
return self.suiteFactory([suite, docSuite])
loadTestsFromModule = loadModule
def loadClass(self, klass):
"""
Given a class which contains test cases, return a sorted list of
C{TestCase} instances.
"""
if not (isinstance(klass, type) or isinstance(klass, types.ClassType)):
raise TypeError("%r is not a class" % (klass,))
if not isTestCase(klass):
raise ValueError("%r is not a test case" % (klass,))
names = self.getTestCaseNames(klass)
tests = self.sort([self._makeCase(klass, self.methodPrefix+name)
for name in names])
return self.suiteFactory(tests)
loadTestsFromTestCase = loadClass
def getTestCaseNames(self, klass):
"""
Given a class that contains C{TestCase}s, return a list of names of
methods that probably contain tests.
"""
return reflect.prefixedMethodNames(klass, self.methodPrefix)
def loadMethod(self, method):
"""
Given a method of a C{TestCase} that represents a test, return a
C{TestCase} instance for that test.
"""
if not isinstance(method, types.MethodType):
raise TypeError("%r not a method" % (method,))
return self._makeCase(method.im_class, method.__name__)
def _makeCase(self, klass, methodName):
return klass(methodName)
def loadPackage(self, package, recurse=False):
"""
Load tests from a module object representing a package, and return a
TestSuite containing those tests.
Tests are only loaded from modules whose name begins with 'test_'
(or whatever C{modulePrefix} is set to).
@param package: a types.ModuleType object (or reasonable facsimilie
obtained by importing) which may contain tests.
@param recurse: A boolean. If True, inspect modules within packages
within the given package (and so on), otherwise, only inspect modules
in the package itself.
@raise: TypeError if 'package' is not a package.
@return: a TestSuite created with my suiteFactory, containing all the
tests.
"""
if not isPackage(package):
raise TypeError("%r is not a package" % (package,))
pkgobj = modules.getModule(package.__name__)
if recurse:
discovery = pkgobj.walkModules()
else:
discovery = pkgobj.iterModules()
discovered = []
for disco in discovery:
if disco.name.split(".")[-1].startswith(self.modulePrefix):
discovered.append(disco)
suite = self.suiteFactory()
for modinfo in self.sort(discovered):
try:
module = modinfo.load()
except:
thingToAdd = ErrorHolder(modinfo.name, failure.Failure())
else:
thingToAdd = self.loadModule(module)
suite.addTest(thingToAdd)
return suite
def loadDoctests(self, module):
"""
Return a suite of tests for all the doctests defined in C{module}.
@param module: A module object or a module name.
"""
if isinstance(module, str):
try:
module = reflect.namedAny(module)
except:
return ErrorHolder(module, failure.Failure())
if not inspect.ismodule(module):
warnings.warn("trial only supports doctesting modules")
return
extraArgs = {}
if sys.version_info > (2, 4):
# Work around Python issue2604: DocTestCase.tearDown clobbers globs
def saveGlobals(test):
"""
Save C{test.globs} and replace it with a copy so that if
necessary, the original will be available for the next test
run.
"""
test._savedGlobals = getattr(test, '_savedGlobals', test.globs)
test.globs = test._savedGlobals.copy()
extraArgs['setUp'] = saveGlobals
return doctest.DocTestSuite(module, **extraArgs)
def loadAnything(self, thing, recurse=False):
"""
Given a Python object, return whatever tests that are in it. Whatever
'in' might mean.
@param thing: A Python object. A module, method, class or package.
@param recurse: Whether or not to look in subpackages of packages.
Defaults to False.
@return: A C{TestCase} or C{TestSuite}.
"""
if isinstance(thing, types.ModuleType):
if isPackage(thing):
return self.loadPackage(thing, recurse)
return self.loadModule(thing)
elif isinstance(thing, types.ClassType):
return self.loadClass(thing)
elif isinstance(thing, type):
return self.loadClass(thing)
elif isinstance(thing, types.MethodType):
return self.loadMethod(thing)
raise TypeError("No loader for %r. Unrecognized type" % (thing,))
def loadByName(self, name, recurse=False):
"""
Given a string representing a Python object, return whatever tests
are in that object.
If C{name} is somehow inaccessible (e.g. the module can't be imported,
there is no Python object with that name etc) then return an
L{ErrorHolder}.
@param name: The fully-qualified name of a Python object.
"""
try:
thing = self.findByName(name)
except:
return ErrorHolder(name, failure.Failure())
return self.loadAnything(thing, recurse)
loadTestsFromName = loadByName
def loadByNames(self, names, recurse=False):
"""
Construct a TestSuite containing all the tests found in 'names', where
names is a list of fully qualified python names and/or filenames. The
suite returned will have no duplicate tests, even if the same object
is named twice.
"""
things = []
errors = []
for name in names:
try:
things.append(self.findByName(name))
except:
errors.append(ErrorHolder(name, failure.Failure()))
suites = [self.loadAnything(thing, recurse)
for thing in set(things)]
suites.extend(errors)
return self.suiteFactory(suites)
class DryRunVisitor(object):
"""
A visitor that makes a reporter think that every test visited has run
successfully.
"""
def __init__(self, reporter):
"""
@param reporter: A C{TestResult} object.
"""
self.reporter = reporter
def markSuccessful(self, testCase):
"""
Convince the reporter that this test has been run successfully.
"""
self.reporter.startTest(testCase)
self.reporter.addSuccess(testCase)
self.reporter.stopTest(testCase)
class TrialRunner(object):
"""
A specialised runner that the trial front end uses.
"""
DEBUG = 'debug'
DRY_RUN = 'dry-run'
def _getDebugger(self):
dbg = pdb.Pdb()
try:
import readline
except ImportError:
print "readline module not available"
sys.exc_clear()
for path in ('.pdbrc', 'pdbrc'):
if os.path.exists(path):
try:
rcFile = file(path, 'r')
except IOError:
sys.exc_clear()
else:
dbg.rcLines.extend(rcFile.readlines())
return dbg
def _removeSafely(self, path):
"""
Safely remove a path, recursively.
If C{path} does not contain a node named C{"_trial_marker"}, a
L{_NoTrialMarker} exception is raised and the path is not removed.
@type path: L{twisted.python.filepath.FilePath}
@param path: The absolute path to a test directory
"""
if not path.child('_trial_marker').exists():
raise _NoTrialMarker(
'%r is not a trial temporary path, refusing to remove it'
% (path,))
try:
path.remove()
except OSError, e:
print ("could not remove %r, caught OSError [Errno %s]: %s"
% (path, e.errno, e.strerror))
try:
newPath = filepath.FilePath('_trial_temp_old%s'
% random.randint(0, 99999999))
path.moveTo(newPath)
except OSError, e:
print ("could not rename path, caught OSError [Errno %s]: %s"
% (e.errno, e.strerror))
raise
def _setUpTestdir(self):
self._tearDownLogFile()
currentDir = os.getcwd()
base = filepath.FilePath(self.workingDirectory)
counter = 0
while True:
if counter:
testdir = base.sibling('%s-%d' % (base.basename(), counter))
else:
testdir = base
self._testDirLock = FilesystemLock(testdir.path + '.lock')
if self._testDirLock.lock():
# It is not in use
if testdir.exists():
# It exists though - delete it
self._removeSafely(testdir)
break
else:
# It is in use
if self.workingDirectory == '_trial_temp':
counter += 1
else:
raise _WorkingDirectoryBusy()
testdir.makedirs()
os.chdir(testdir.path)
file('_trial_marker', 'w').close()
return currentDir
def _tearDownTestdir(self, oldDir):
os.chdir(oldDir)
self._testDirLock.unlock()
_log = log
def _makeResult(self):
reporter = self.reporterFactory(self.stream, self.tbformat,
self.rterrors, self._log)
if self.uncleanWarnings:
reporter = UncleanWarningsReporterWrapper(reporter)
return reporter
def __init__(self, reporterFactory,
mode=None,
logfile='test.log',
stream=sys.stdout,
profile=False,
tracebackFormat='default',
realTimeErrors=False,
uncleanWarnings=False,
workingDirectory=None,
forceGarbageCollection=False):
self.reporterFactory = reporterFactory
self.logfile = logfile
self.mode = mode
self.stream = stream
self.tbformat = tracebackFormat
self.rterrors = realTimeErrors
self.uncleanWarnings = uncleanWarnings
self._result = None
self.workingDirectory = workingDirectory or '_trial_temp'
self._logFileObserver = None
self._logFileObject = None
self._forceGarbageCollection = forceGarbageCollection
if profile:
self.run = util.profiled(self.run, 'profile.data')
def _tearDownLogFile(self):
if self._logFileObserver is not None:
log.removeObserver(self._logFileObserver.emit)
self._logFileObserver = None
if self._logFileObject is not None:
self._logFileObject.close()
self._logFileObject = None
def _setUpLogFile(self):
self._tearDownLogFile()
if self.logfile == '-':
logFile = sys.stdout
else:
logFile = file(self.logfile, 'a')
self._logFileObject = logFile
self._logFileObserver = log.FileLogObserver(logFile)
log.startLoggingWithObserver(self._logFileObserver.emit, 0)
def run(self, test):
"""
Run the test or suite and return a result object.
"""
test = unittest.decorate(test, ITestCase)
if self._forceGarbageCollection:
test = unittest.decorate(
test, unittest._ForceGarbageCollectionDecorator)
return self._runWithoutDecoration(test)
def _runWithoutDecoration(self, test):
"""
Private helper that runs the given test but doesn't decorate it.
"""
result = self._makeResult()
# decorate the suite with reactor cleanup and log starting
# This should move out of the runner and be presumed to be
# present
suite = TrialSuite([test])
startTime = time.time()
if self.mode == self.DRY_RUN:
for single in unittest._iterateTests(suite):
result.startTest(single)
result.addSuccess(single)
result.stopTest(single)
else:
if self.mode == self.DEBUG:
# open question - should this be self.debug() instead.
debugger = self._getDebugger()
run = lambda: debugger.runcall(suite.run, result)
else:
run = lambda: suite.run(result)
oldDir = self._setUpTestdir()
try:
self._setUpLogFile()
run()
finally:
self._tearDownLogFile()
self._tearDownTestdir(oldDir)
endTime = time.time()
done = getattr(result, 'done', None)
if done is None:
warnings.warn(
"%s should implement done() but doesn't. Falling back to "
"printErrors() and friends." % reflect.qual(result.__class__),
category=DeprecationWarning, stacklevel=3)
result.printErrors()
result.writeln(result.separator)
result.writeln('Ran %d tests in %.3fs', result.testsRun,
endTime - startTime)
result.write('\n')
result.printSummary()
else:
result.done()
return result
def runUntilFailure(self, test):
"""
Repeatedly run C{test} until it fails.
"""
count = 0
while True:
count += 1
self.stream.write("Test Pass %d\n" % (count,))
if count == 1:
result = self.run(test)
else:
result = self._runWithoutDecoration(test)
if result.testsRun == 0:
break
if not result.wasSuccessful():
break
return result
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