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518 lines
22 KiB
518 lines
22 KiB
3 years ago
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"""Loading unittests."""
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import os
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import re
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import sys
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import traceback
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import types
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import functools
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import warnings
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from fnmatch import fnmatch, fnmatchcase
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from . import case, suite, util
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__unittest = True
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# what about .pyc (etc)
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# we would need to avoid loading the same tests multiple times
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# from '.py', *and* '.pyc'
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VALID_MODULE_NAME = re.compile(r'[_a-z]\w*\.py$', re.IGNORECASE)
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class _FailedTest(case.TestCase):
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_testMethodName = None
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def __init__(self, method_name, exception):
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self._exception = exception
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super(_FailedTest, self).__init__(method_name)
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def __getattr__(self, name):
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if name != self._testMethodName:
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return super(_FailedTest, self).__getattr__(name)
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def testFailure():
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raise self._exception
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return testFailure
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def _make_failed_import_test(name, suiteClass):
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message = 'Failed to import test module: %s\n%s' % (
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name, traceback.format_exc())
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return _make_failed_test(name, ImportError(message), suiteClass, message)
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def _make_failed_load_tests(name, exception, suiteClass):
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message = 'Failed to call load_tests:\n%s' % (traceback.format_exc(),)
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return _make_failed_test(
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name, exception, suiteClass, message)
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def _make_failed_test(methodname, exception, suiteClass, message):
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test = _FailedTest(methodname, exception)
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return suiteClass((test,)), message
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def _make_skipped_test(methodname, exception, suiteClass):
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@case.skip(str(exception))
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def testSkipped(self):
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pass
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attrs = {methodname: testSkipped}
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TestClass = type("ModuleSkipped", (case.TestCase,), attrs)
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return suiteClass((TestClass(methodname),))
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def _jython_aware_splitext(path):
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if path.lower().endswith('$py.class'):
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return path[:-9]
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return os.path.splitext(path)[0]
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class TestLoader(object):
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"""
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This class is responsible for loading tests according to various criteria
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and returning them wrapped in a TestSuite
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"""
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testMethodPrefix = 'test'
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sortTestMethodsUsing = staticmethod(util.three_way_cmp)
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testNamePatterns = None
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suiteClass = suite.TestSuite
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_top_level_dir = None
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def __init__(self):
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super(TestLoader, self).__init__()
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self.errors = []
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# Tracks packages which we have called into via load_tests, to
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# avoid infinite re-entrancy.
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self._loading_packages = set()
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def loadTestsFromTestCase(self, testCaseClass):
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"""Return a suite of all test cases contained in testCaseClass"""
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if issubclass(testCaseClass, suite.TestSuite):
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raise TypeError("Test cases should not be derived from "
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"TestSuite. Maybe you meant to derive from "
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"TestCase?")
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testCaseNames = self.getTestCaseNames(testCaseClass)
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if not testCaseNames and hasattr(testCaseClass, 'runTest'):
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testCaseNames = ['runTest']
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loaded_suite = self.suiteClass(map(testCaseClass, testCaseNames))
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return loaded_suite
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# XXX After Python 3.5, remove backward compatibility hacks for
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# use_load_tests deprecation via *args and **kws. See issue 16662.
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def loadTestsFromModule(self, module, *args, pattern=None, **kws):
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"""Return a suite of all test cases contained in the given module"""
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# This method used to take an undocumented and unofficial
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# use_load_tests argument. For backward compatibility, we still
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# accept the argument (which can also be the first position) but we
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# ignore it and issue a deprecation warning if it's present.
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if len(args) > 0 or 'use_load_tests' in kws:
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warnings.warn('use_load_tests is deprecated and ignored',
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DeprecationWarning)
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kws.pop('use_load_tests', None)
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if len(args) > 1:
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# Complain about the number of arguments, but don't forget the
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# required `module` argument.
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complaint = len(args) + 1
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raise TypeError('loadTestsFromModule() takes 1 positional argument but {} were given'.format(complaint))
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if len(kws) != 0:
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# Since the keyword arguments are unsorted (see PEP 468), just
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# pick the alphabetically sorted first argument to complain about,
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# if multiple were given. At least the error message will be
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# predictable.
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complaint = sorted(kws)[0]
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raise TypeError("loadTestsFromModule() got an unexpected keyword argument '{}'".format(complaint))
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tests = []
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for name in dir(module):
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obj = getattr(module, name)
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if isinstance(obj, type) and issubclass(obj, case.TestCase):
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tests.append(self.loadTestsFromTestCase(obj))
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load_tests = getattr(module, 'load_tests', None)
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tests = self.suiteClass(tests)
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if load_tests is not None:
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try:
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return load_tests(self, tests, pattern)
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except Exception as e:
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error_case, error_message = _make_failed_load_tests(
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module.__name__, e, self.suiteClass)
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self.errors.append(error_message)
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return error_case
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return tests
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def loadTestsFromName(self, name, module=None):
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"""Return a suite of all test cases given a string specifier.
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The name may resolve either to a module, a test case class, a
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test method within a test case class, or a callable object which
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returns a TestCase or TestSuite instance.
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The method optionally resolves the names relative to a given module.
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"""
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parts = name.split('.')
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error_case, error_message = None, None
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if module is None:
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parts_copy = parts[:]
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while parts_copy:
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try:
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module_name = '.'.join(parts_copy)
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module = __import__(module_name)
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break
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except ImportError:
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next_attribute = parts_copy.pop()
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# Last error so we can give it to the user if needed.
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error_case, error_message = _make_failed_import_test(
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next_attribute, self.suiteClass)
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if not parts_copy:
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# Even the top level import failed: report that error.
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self.errors.append(error_message)
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return error_case
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parts = parts[1:]
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obj = module
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for part in parts:
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try:
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parent, obj = obj, getattr(obj, part)
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except AttributeError as e:
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# We can't traverse some part of the name.
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if (getattr(obj, '__path__', None) is not None
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and error_case is not None):
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# This is a package (no __path__ per importlib docs), and we
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# encountered an error importing something. We cannot tell
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# the difference between package.WrongNameTestClass and
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# package.wrong_module_name so we just report the
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# ImportError - it is more informative.
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self.errors.append(error_message)
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return error_case
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else:
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# Otherwise, we signal that an AttributeError has occurred.
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error_case, error_message = _make_failed_test(
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part, e, self.suiteClass,
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'Failed to access attribute:\n%s' % (
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traceback.format_exc(),))
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self.errors.append(error_message)
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return error_case
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if isinstance(obj, types.ModuleType):
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return self.loadTestsFromModule(obj)
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elif isinstance(obj, type) and issubclass(obj, case.TestCase):
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return self.loadTestsFromTestCase(obj)
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elif (isinstance(obj, types.FunctionType) and
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isinstance(parent, type) and
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issubclass(parent, case.TestCase)):
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name = parts[-1]
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inst = parent(name)
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# static methods follow a different path
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if not isinstance(getattr(inst, name), types.FunctionType):
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return self.suiteClass([inst])
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elif isinstance(obj, suite.TestSuite):
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return obj
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if callable(obj):
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test = obj()
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if isinstance(test, suite.TestSuite):
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return test
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elif isinstance(test, case.TestCase):
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return self.suiteClass([test])
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else:
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raise TypeError("calling %s returned %s, not a test" %
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(obj, test))
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else:
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raise TypeError("don't know how to make test from: %s" % obj)
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def loadTestsFromNames(self, names, module=None):
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"""Return a suite of all test cases found using the given sequence
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of string specifiers. See 'loadTestsFromName()'.
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"""
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suites = [self.loadTestsFromName(name, module) for name in names]
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return self.suiteClass(suites)
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def getTestCaseNames(self, testCaseClass):
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"""Return a sorted sequence of method names found within testCaseClass
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"""
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def shouldIncludeMethod(attrname):
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if not attrname.startswith(self.testMethodPrefix):
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return False
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testFunc = getattr(testCaseClass, attrname)
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if not callable(testFunc):
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return False
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fullName = f'%s.%s.%s' % (
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testCaseClass.__module__, testCaseClass.__qualname__, attrname
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)
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return self.testNamePatterns is None or \
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any(fnmatchcase(fullName, pattern) for pattern in self.testNamePatterns)
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testFnNames = list(filter(shouldIncludeMethod, dir(testCaseClass)))
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if self.sortTestMethodsUsing:
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testFnNames.sort(key=functools.cmp_to_key(self.sortTestMethodsUsing))
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return testFnNames
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def discover(self, start_dir, pattern='test*.py', top_level_dir=None):
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"""Find and return all test modules from the specified start
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directory, recursing into subdirectories to find them and return all
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tests found within them. Only test files that match the pattern will
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be loaded. (Using shell style pattern matching.)
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All test modules must be importable from the top level of the project.
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If the start directory is not the top level directory then the top
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level directory must be specified separately.
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If a test package name (directory with '__init__.py') matches the
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pattern then the package will be checked for a 'load_tests' function. If
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this exists then it will be called with (loader, tests, pattern) unless
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the package has already had load_tests called from the same discovery
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invocation, in which case the package module object is not scanned for
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tests - this ensures that when a package uses discover to further
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discover child tests that infinite recursion does not happen.
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If load_tests exists then discovery does *not* recurse into the package,
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load_tests is responsible for loading all tests in the package.
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The pattern is deliberately not stored as a loader attribute so that
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packages can continue discovery themselves. top_level_dir is stored so
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load_tests does not need to pass this argument in to loader.discover().
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Paths are sorted before being imported to ensure reproducible execution
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order even on filesystems with non-alphabetical ordering like ext3/4.
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"""
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set_implicit_top = False
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if top_level_dir is None and self._top_level_dir is not None:
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# make top_level_dir optional if called from load_tests in a package
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top_level_dir = self._top_level_dir
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elif top_level_dir is None:
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set_implicit_top = True
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top_level_dir = start_dir
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top_level_dir = os.path.abspath(top_level_dir)
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if not top_level_dir in sys.path:
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# all test modules must be importable from the top level directory
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# should we *unconditionally* put the start directory in first
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# in sys.path to minimise likelihood of conflicts between installed
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# modules and development versions?
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sys.path.insert(0, top_level_dir)
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self._top_level_dir = top_level_dir
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is_not_importable = False
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is_namespace = False
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tests = []
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if os.path.isdir(os.path.abspath(start_dir)):
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start_dir = os.path.abspath(start_dir)
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if start_dir != top_level_dir:
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is_not_importable = not os.path.isfile(os.path.join(start_dir, '__init__.py'))
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else:
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# support for discovery from dotted module names
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try:
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__import__(start_dir)
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except ImportError:
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is_not_importable = True
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else:
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the_module = sys.modules[start_dir]
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top_part = start_dir.split('.')[0]
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try:
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start_dir = os.path.abspath(
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os.path.dirname((the_module.__file__)))
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except AttributeError:
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# look for namespace packages
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try:
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spec = the_module.__spec__
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except AttributeError:
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spec = None
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if spec and spec.loader is None:
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if spec.submodule_search_locations is not None:
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is_namespace = True
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for path in the_module.__path__:
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if (not set_implicit_top and
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not path.startswith(top_level_dir)):
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continue
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self._top_level_dir = \
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(path.split(the_module.__name__
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.replace(".", os.path.sep))[0])
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tests.extend(self._find_tests(path,
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pattern,
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namespace=True))
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elif the_module.__name__ in sys.builtin_module_names:
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# builtin module
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raise TypeError('Can not use builtin modules '
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'as dotted module names') from None
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else:
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raise TypeError(
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'don\'t know how to discover from {!r}'
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.format(the_module)) from None
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if set_implicit_top:
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if not is_namespace:
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self._top_level_dir = \
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self._get_directory_containing_module(top_part)
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sys.path.remove(top_level_dir)
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else:
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sys.path.remove(top_level_dir)
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if is_not_importable:
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raise ImportError('Start directory is not importable: %r' % start_dir)
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if not is_namespace:
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tests = list(self._find_tests(start_dir, pattern))
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return self.suiteClass(tests)
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def _get_directory_containing_module(self, module_name):
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module = sys.modules[module_name]
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full_path = os.path.abspath(module.__file__)
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if os.path.basename(full_path).lower().startswith('__init__.py'):
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return os.path.dirname(os.path.dirname(full_path))
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else:
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||
|
|
# here we have been given a module rather than a package - so
|
||
|
|
# all we can do is search the *same* directory the module is in
|
||
|
|
# should an exception be raised instead
|
||
|
|
return os.path.dirname(full_path)
|
||
|
|
|
||
|
|
def _get_name_from_path(self, path):
|
||
|
|
if path == self._top_level_dir:
|
||
|
|
return '.'
|
||
|
|
path = _jython_aware_splitext(os.path.normpath(path))
|
||
|
|
|
||
|
|
_relpath = os.path.relpath(path, self._top_level_dir)
|
||
|
|
assert not os.path.isabs(_relpath), "Path must be within the project"
|
||
|
|
assert not _relpath.startswith('..'), "Path must be within the project"
|
||
|
|
|
||
|
|
name = _relpath.replace(os.path.sep, '.')
|
||
|
|
return name
|
||
|
|
|
||
|
|
def _get_module_from_name(self, name):
|
||
|
|
__import__(name)
|
||
|
|
return sys.modules[name]
|
||
|
|
|
||
|
|
def _match_path(self, path, full_path, pattern):
|
||
|
|
# override this method to use alternative matching strategy
|
||
|
|
return fnmatch(path, pattern)
|
||
|
|
|
||
|
|
def _find_tests(self, start_dir, pattern, namespace=False):
|
||
|
|
"""Used by discovery. Yields test suites it loads."""
|
||
|
|
# Handle the __init__ in this package
|
||
|
|
name = self._get_name_from_path(start_dir)
|
||
|
|
# name is '.' when start_dir == top_level_dir (and top_level_dir is by
|
||
|
|
# definition not a package).
|
||
|
|
if name != '.' and name not in self._loading_packages:
|
||
|
|
# name is in self._loading_packages while we have called into
|
||
|
|
# loadTestsFromModule with name.
|
||
|
|
tests, should_recurse = self._find_test_path(
|
||
|
|
start_dir, pattern, namespace)
|
||
|
|
if tests is not None:
|
||
|
|
yield tests
|
||
|
|
if not should_recurse:
|
||
|
|
# Either an error occurred, or load_tests was used by the
|
||
|
|
# package.
|
||
|
|
return
|
||
|
|
# Handle the contents.
|
||
|
|
paths = sorted(os.listdir(start_dir))
|
||
|
|
for path in paths:
|
||
|
|
full_path = os.path.join(start_dir, path)
|
||
|
|
tests, should_recurse = self._find_test_path(
|
||
|
|
full_path, pattern, namespace)
|
||
|
|
if tests is not None:
|
||
|
|
yield tests
|
||
|
|
if should_recurse:
|
||
|
|
# we found a package that didn't use load_tests.
|
||
|
|
name = self._get_name_from_path(full_path)
|
||
|
|
self._loading_packages.add(name)
|
||
|
|
try:
|
||
|
|
yield from self._find_tests(full_path, pattern, namespace)
|
||
|
|
finally:
|
||
|
|
self._loading_packages.discard(name)
|
||
|
|
|
||
|
|
def _find_test_path(self, full_path, pattern, namespace=False):
|
||
|
|
"""Used by discovery.
|
||
|
|
|
||
|
|
Loads tests from a single file, or a directories' __init__.py when
|
||
|
|
passed the directory.
|
||
|
|
|
||
|
|
Returns a tuple (None_or_tests_from_file, should_recurse).
|
||
|
|
"""
|
||
|
|
basename = os.path.basename(full_path)
|
||
|
|
if os.path.isfile(full_path):
|
||
|
|
if not VALID_MODULE_NAME.match(basename):
|
||
|
|
# valid Python identifiers only
|
||
|
|
return None, False
|
||
|
|
if not self._match_path(basename, full_path, pattern):
|
||
|
|
return None, False
|
||
|
|
# if the test file matches, load it
|
||
|
|
name = self._get_name_from_path(full_path)
|
||
|
|
try:
|
||
|
|
module = self._get_module_from_name(name)
|
||
|
|
except case.SkipTest as e:
|
||
|
|
return _make_skipped_test(name, e, self.suiteClass), False
|
||
|
|
except:
|
||
|
|
error_case, error_message = \
|
||
|
|
_make_failed_import_test(name, self.suiteClass)
|
||
|
|
self.errors.append(error_message)
|
||
|
|
return error_case, False
|
||
|
|
else:
|
||
|
|
mod_file = os.path.abspath(
|
||
|
|
getattr(module, '__file__', full_path))
|
||
|
|
realpath = _jython_aware_splitext(
|
||
|
|
os.path.realpath(mod_file))
|
||
|
|
fullpath_noext = _jython_aware_splitext(
|
||
|
|
os.path.realpath(full_path))
|
||
|
|
if realpath.lower() != fullpath_noext.lower():
|
||
|
|
module_dir = os.path.dirname(realpath)
|
||
|
|
mod_name = _jython_aware_splitext(
|
||
|
|
os.path.basename(full_path))
|
||
|
|
expected_dir = os.path.dirname(full_path)
|
||
|
|
msg = ("%r module incorrectly imported from %r. Expected "
|
||
|
|
"%r. Is this module globally installed?")
|
||
|
|
raise ImportError(
|
||
|
|
msg % (mod_name, module_dir, expected_dir))
|
||
|
|
return self.loadTestsFromModule(module, pattern=pattern), False
|
||
|
|
elif os.path.isdir(full_path):
|
||
|
|
if (not namespace and
|
||
|
|
not os.path.isfile(os.path.join(full_path, '__init__.py'))):
|
||
|
|
return None, False
|
||
|
|
|
||
|
|
load_tests = None
|
||
|
|
tests = None
|
||
|
|
name = self._get_name_from_path(full_path)
|
||
|
|
try:
|
||
|
|
package = self._get_module_from_name(name)
|
||
|
|
except case.SkipTest as e:
|
||
|
|
return _make_skipped_test(name, e, self.suiteClass), False
|
||
|
|
except:
|
||
|
|
error_case, error_message = \
|
||
|
|
_make_failed_import_test(name, self.suiteClass)
|
||
|
|
self.errors.append(error_message)
|
||
|
|
return error_case, False
|
||
|
|
else:
|
||
|
|
load_tests = getattr(package, 'load_tests', None)
|
||
|
|
# Mark this package as being in load_tests (possibly ;))
|
||
|
|
self._loading_packages.add(name)
|
||
|
|
try:
|
||
|
|
tests = self.loadTestsFromModule(package, pattern=pattern)
|
||
|
|
if load_tests is not None:
|
||
|
|
# loadTestsFromModule(package) has loaded tests for us.
|
||
|
|
return tests, False
|
||
|
|
return tests, True
|
||
|
|
finally:
|
||
|
|
self._loading_packages.discard(name)
|
||
|
|
else:
|
||
|
|
return None, False
|
||
|
|
|
||
|
|
|
||
|
|
defaultTestLoader = TestLoader()
|
||
|
|
|
||
|
|
|
||
|
|
def _makeLoader(prefix, sortUsing, suiteClass=None, testNamePatterns=None):
|
||
|
|
loader = TestLoader()
|
||
|
|
loader.sortTestMethodsUsing = sortUsing
|
||
|
|
loader.testMethodPrefix = prefix
|
||
|
|
loader.testNamePatterns = testNamePatterns
|
||
|
|
if suiteClass:
|
||
|
|
loader.suiteClass = suiteClass
|
||
|
|
return loader
|
||
|
|
|
||
|
|
def getTestCaseNames(testCaseClass, prefix, sortUsing=util.three_way_cmp, testNamePatterns=None):
|
||
|
|
return _makeLoader(prefix, sortUsing, testNamePatterns=testNamePatterns).getTestCaseNames(testCaseClass)
|
||
|
|
|
||
|
|
def makeSuite(testCaseClass, prefix='test', sortUsing=util.three_way_cmp,
|
||
|
|
suiteClass=suite.TestSuite):
|
||
|
|
return _makeLoader(prefix, sortUsing, suiteClass).loadTestsFromTestCase(
|
||
|
|
testCaseClass)
|
||
|
|
|
||
|
|
def findTestCases(module, prefix='test', sortUsing=util.three_way_cmp,
|
||
|
|
suiteClass=suite.TestSuite):
|
||
|
|
return _makeLoader(prefix, sortUsing, suiteClass).loadTestsFromModule(\
|
||
|
|
module)
|