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"""
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
from inspect import isfunction, 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 cmp_lineno, getpackage, isclass, isgenerator, ispackage, \
match_last, resolve_name, transplant_func, transplant_class
from nose.suite import ContextSuiteFactory, ContextList, LazySuite
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 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:
cases.sort(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)
entries.sort(lambda a, b: match_last(a, b, 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:
map(remove_path, paths_added)
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)])
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):
for test in g():
try:
test_func, arg = (test[0], test[1:])
except ValueError:
test_func, arg = test[0], tuple()
if not callable(test_func):
test_func = getattr(m, test_func)
yield FunctionTestCase(test_func, arg=arg, descriptor=g)
return self.suiteClass(generate)
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
cls = generator.im_class
inst = cls()
method = generator.__name__
generator = getattr(inst, method)
def generate(g=generator, c=cls):
for test in g():
try:
test_func, arg = (test[0], test[1:])
except ValueError:
test_func, arg = test[0], tuple()
if not callable(test_func):
test_func = 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)
return self.suiteClass(generate)
def loadTestsFromModule(self, module, 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)
test_classes.sort(lambda a, b: cmp(a.__name__, b.__name__))
test_funcs.sort(cmp_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?
paths = getattr(module, '__path__', [])
for path in paths:
tests.extend(self.loadTestsFromDir(path))
for test in self.config.plugins.loadTestsFromModule(module):
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)])
if addr.call:
return self.loadTestsFromName(addr.call, module)
else:
return self.loadTestsFromModule(
module, 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))])
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)])
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)])
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 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):
"""Given a test object and its parent, return a test case
or test suite.
"""
plug_tests = []
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:
return Failure(*sys.exc_info())
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)
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
defaultTestLoader = TestLoader