# documentação Django 2.0.8

# Código fonte para unittest.suite

    """TestSuite"""

    import sys

    from . import case
    from . import util

    __unittest = True

    def _call_if_exists(parent, attr):
        func = getattr(parent, attr, lambda: None)
        func()

    class BaseTestSuite(object):
        """A simple test suite that doesn't provide class or module shared fixtures.
        """
        _cleanup = True

        def __init__(self, tests=()):
            self._tests = []
            self._removed_tests = 0
            self.addTests(tests)

        def __repr__(self):
            return "<%s tests=%s>" % (util.strclass(self.__class__), list(self))

        def __eq__(self, other):
            if not isinstance(other, self.__class__):
                return NotImplemented
            return list(self) == list(other)

        def __iter__(self):
            return iter(self._tests)

        def countTestCases(self):
            cases = self._removed_tests
            for test in self:
                if test:
                    cases += test.countTestCases()
            return cases

        def addTest(self, test):
            # sanity checks
            if not callable(test):
                raise TypeError("{} is not callable".format(repr(test)))
            if isinstance(test, type) and issubclass(test,
                                                     (case.TestCase, TestSuite)):
                raise TypeError("TestCases and TestSuites must be instantiated "
                                "before passing them to addTest()")
            self._tests.append(test)

        def addTests(self, tests):
            if isinstance(tests, str):
                raise TypeError("tests must be an iterable of tests, not a string")
            for test in tests:
                self.addTest(test)

        def run(self, result):
            for index, test in enumerate(self):
                if result.shouldStop:
                    break
                test(result)
                if self._cleanup:
                    self._removeTestAtIndex(index)
            return result

        def _removeTestAtIndex(self, index):
            """Stop holding a reference to the TestCase at index."""
            try:
                test = self._tests[index]
            except TypeError:
                # support for suite implementations that have overridden self._tests
                pass
            else:
                # Some unittest tests add non TestCase/TestSuite objects to
                # the suite.
                if hasattr(test, 'countTestCases'):
                    self._removed_tests += test.countTestCases()
                self._tests[index] = None

        def __call__(self, *args, **kwds):
            return self.run(*args, **kwds)

        def debug(self):
            """Run the tests without collecting errors in a TestResult"""
            for test in self:
                test.debug()

    class TestSuite(BaseTestSuite):
        """A test suite is a composite test consisting of a number of TestCases.

        For use, create an instance of TestSuite, then add test case instances.
        When all tests have been added, the suite can be passed to a test
        runner, such as TextTestRunner. It will run the individual test cases
        in the order in which they were added, aggregating the results. When
        subclassing, do not forget to call the base class constructor.
        """

        def run(self, result, debug=False):
            topLevel = False
            if getattr(result, '_testRunEntered', False) is False:
                result._testRunEntered = topLevel = True

            for index, test in enumerate(self):
                if result.shouldStop:
                    break

                if _isnotsuite(test):
                    self._tearDownPreviousClass(test, result)
                    self._handleModuleFixture(test, result)
                    self._handleClassSetUp(test, result)
                    result._previousTestClass = test.__class__

                    if (getattr(test.__class__, '_classSetupFailed', False) or
                        getattr(result, '_moduleSetUpFailed', False)):
                        continue

                if not debug:
                    test(result)
                else:
                    test.debug()

                if self._cleanup:
                    self._removeTestAtIndex(index)

            if topLevel:
                self._tearDownPreviousClass(None, result)
                self._handleModuleTearDown(result)
                result._testRunEntered = False
            return result

        def debug(self):
            """Run the tests without collecting errors in a TestResult"""
            debug = _DebugResult()
            self.run(debug, True)

        ################################

        def _handleClassSetUp(self, test, result):
            previousClass = getattr(result, '_previousTestClass', None)
            currentClass = test.__class__
            if currentClass == previousClass:
                return
            if result._moduleSetUpFailed:
                return
            if getattr(currentClass, "__unittest_skip__", False):
                return

            try:
                currentClass._classSetupFailed = False
            except TypeError:
                # test may actually be a function
                # so its class will be a builtin-type
                pass

            setUpClass = getattr(currentClass, 'setUpClass', None)
            if setUpClass is not None:
                _call_if_exists(result, '_setupStdout')
                try:
                    setUpClass()
                except Exception as e:
                    if isinstance(result, _DebugResult):
                        raise
                    currentClass._classSetupFailed = True
                    className = util.strclass(currentClass)
                    errorName = 'setUpClass (%s)' % className
                    self._addClassOrModuleLevelException(result, e, errorName)
                finally:
                    _call_if_exists(result, '_restoreStdout')

        def _get_previous_module(self, result):
            previousModule = None
            previousClass = getattr(result, '_previousTestClass', None)
            if previousClass is not None:
                previousModule = previousClass.__module__
            return previousModule

        def _handleModuleFixture(self, test, result):
            previousModule = self._get_previous_module(result)
            currentModule = test.__class__.__module__
            if currentModule == previousModule:
                return

            self._handleModuleTearDown(result)

            result._moduleSetUpFailed = False
            try:
                module = sys.modules[currentModule]
            except KeyError:
                return
            setUpModule = getattr(module, 'setUpModule', None)
            if setUpModule is not None:
                _call_if_exists(result, '_setupStdout')
                try:
                    setUpModule()
                except Exception as e:
                    if isinstance(result, _DebugResult):
                        raise
                    result._moduleSetUpFailed = True
                    errorName = 'setUpModule (%s)' % currentModule
                    self._addClassOrModuleLevelException(result, e, errorName)
                finally:
                    _call_if_exists(result, '_restoreStdout')

        def _addClassOrModuleLevelException(self, result, exception, errorName):
            error = _ErrorHolder(errorName)
            addSkip = getattr(result, 'addSkip', None)
            if addSkip is not None and isinstance(exception, case.SkipTest):
                addSkip(error, str(exception))
            else:
                result.addError(error, sys.exc_info())

        def _handleModuleTearDown(self, result):
            previousModule = self._get_previous_module(result)
            if previousModule is None:
                return
            if result._moduleSetUpFailed:
                return

            try:
                module = sys.modules[previousModule]
            except KeyError:
                return

            tearDownModule = getattr(module, 'tearDownModule', None)
            if tearDownModule is not None:
                _call_if_exists(result, '_setupStdout')
                try:
                    tearDownModule()
                except Exception as e:
                    if isinstance(result, _DebugResult):
                        raise
                    errorName = 'tearDownModule (%s)' % previousModule
                    self._addClassOrModuleLevelException(result, e, errorName)
                finally:
                    _call_if_exists(result, '_restoreStdout')

        def _tearDownPreviousClass(self, test, result):
            previousClass = getattr(result, '_previousTestClass', None)
            currentClass = test.__class__
            if currentClass == previousClass:
                return
            if getattr(previousClass, '_classSetupFailed', False):
                return
            if getattr(result, '_moduleSetUpFailed', False):
                return
            if getattr(previousClass, "__unittest_skip__", False):
                return

            tearDownClass = getattr(previousClass, 'tearDownClass', None)
            if tearDownClass is not None:
                _call_if_exists(result, '_setupStdout')
                try:
                    tearDownClass()
                except Exception as e:
                    if isinstance(result, _DebugResult):
                        raise
                    className = util.strclass(previousClass)
                    errorName = 'tearDownClass (%s)' % className
                    self._addClassOrModuleLevelException(result, e, errorName)
                finally:
                    _call_if_exists(result, '_restoreStdout')

    class _ErrorHolder(object):
        """
        Placeholder for a TestCase inside a result. As far as a TestResult
        is concerned, this looks exactly like a unit test. Used to insert
        arbitrary errors into a test suite run.
        """
        # Inspired by the ErrorHolder from Twisted:
        # http://twistedmatrix.com/trac/browser/trunk/twisted/trial/runner.py

        # attribute used by TestResult._exc_info_to_string
        failureException = None

        def __init__(self, description):
            self.description = description

        def id(self):
            return self.description

        def shortDescription(self):
            return None

        def __repr__(self):
            return "<ErrorHolder description=%r>" % (self.description,)

        def __str__(self):
            return self.id()

        def run(self, result):
            # could call result.addError(...) - but this test-like object
            # shouldn't be run anyway
            pass

        def __call__(self, result):
            return self.run(result)

        def countTestCases(self):
            return 0

    def _isnotsuite(test):
        "A crude way to tell apart testcases and suites with duck-typing"
        try:
            iter(test)
        except TypeError:
            return True
        return False

    class _DebugResult(object):
        "Used by the TestSuite to hold previous class when running in debug."
        _previousTestClass = None
        _moduleSetUpFailed = False
        shouldStop = False