# Source code for _pytest.python

    # -*- coding: utf-8 -*-
    """ Python test discovery, setup and run of test functions. """
    from __future__ import absolute_import
    from __future__ import division
    from __future__ import print_function

    import collections
    import fnmatch
    import inspect
    import os
    import sys
    import warnings
    from functools import partial
    from textwrap import dedent

    import py
    import six

    import _pytest
    from _pytest import deprecated
    from _pytest import fixtures
    from _pytest import nodes
    from _pytest._code import filter_traceback
    from _pytest.compat import ascii_escaped
    from _pytest.compat import enum
    from _pytest.compat import get_default_arg_names
    from _pytest.compat import get_real_func
    from _pytest.compat import getfslineno
    from _pytest.compat import getimfunc
    from _pytest.compat import getlocation
    from _pytest.compat import is_generator
    from _pytest.compat import isclass
    from _pytest.compat import isfunction
    from _pytest.compat import NOTSET
    from _pytest.compat import REGEX_TYPE
    from _pytest.compat import safe_getattr
    from _pytest.compat import safe_isclass
    from _pytest.compat import safe_str
    from _pytest.compat import STRING_TYPES
    from _pytest.config import hookimpl
    from _pytest.main import FSHookProxy
    from _pytest.mark import MARK_GEN
    from _pytest.mark.structures import get_unpacked_marks
    from _pytest.mark.structures import normalize_mark_list
    from _pytest.outcomes import fail
    from _pytest.outcomes import skip
    from _pytest.pathlib import parts
    from _pytest.warning_types import PytestCollectionWarning
    from _pytest.warning_types import PytestUnhandledCoroutineWarning

    def pyobj_property(name):
        def get(self):
            node = self.getparent(getattr(__import__("pytest"), name))
            if node is not None:
                return node.obj

        doc = "python %s object this node was collected from (can be None)." % (
            name.lower(),
        )
        return property(get, None, None, doc)

    def pytest_addoption(parser):
        group = parser.getgroup("general")
        group.addoption(
            "--fixtures",
            "--funcargs",
            action="store_true",
            dest="showfixtures",
            default=False,
            help="show available fixtures, sorted by plugin appearance "
            "(fixtures with leading '_' are only shown with '-v')",
        )
        group.addoption(
            "--fixtures-per-test",
            action="store_true",
            dest="show_fixtures_per_test",
            default=False,
            help="show fixtures per test",
        )
        parser.addini(
            "python_files",
            type="args",
            # NOTE: default is also used in AssertionRewritingHook.
            default=["test_*.py", "*_test.py"],
            help="glob-style file patterns for Python test module discovery",
        )
        parser.addini(
            "python_classes",
            type="args",
            default=["Test"],
            help="prefixes or glob names for Python test class discovery",
        )
        parser.addini(
            "python_functions",
            type="args",
            default=["test"],
            help="prefixes or glob names for Python test function and method discovery",
        )
        parser.addini(
            "disable_test_id_escaping_and_forfeit_all_rights_to_community_support",
            type="bool",
            default=False,
            help="disable string escape non-ascii characters, might cause unwanted "
            "side effects(use at your own risk)",
        )

        group.addoption(
            "--import-mode",
            default="prepend",
            choices=["prepend", "append"],
            dest="importmode",
            help="prepend/append to sys.path when importing test modules, "
            "default is to prepend.",
        )

    def pytest_cmdline_main(config):
        if config.option.showfixtures:
            showfixtures(config)
            return 0
        if config.option.show_fixtures_per_test:
            show_fixtures_per_test(config)
            return 0

    def pytest_generate_tests(metafunc):
        # those alternative spellings are common - raise a specific error to alert
        # the user
        alt_spellings = ["parameterize", "parametrise", "parameterise"]
        for mark_name in alt_spellings:
            if metafunc.definition.get_closest_marker(mark_name):
                msg = "{0} has '{1}' mark, spelling should be 'parametrize'"
                fail(msg.format(metafunc.function.__name__, mark_name), pytrace=False)
        for marker in metafunc.definition.iter_markers(name="parametrize"):
            metafunc.parametrize(*marker.args, **marker.kwargs)

    def pytest_configure(config):
        config.addinivalue_line(
            "markers",
            "parametrize(argnames, argvalues): call a test function multiple "
            "times passing in different arguments in turn. argvalues generally "
            "needs to be a list of values if argnames specifies only one name "
            "or a list of tuples of values if argnames specifies multiple names. "
            "Example: @parametrize('arg1', [1,2]) would lead to two calls of the "
            "decorated test function, one with arg1=1 and another with arg1=2."
            "see https://docs.pytest.org/en/latest/parametrize.html for more info "
            "and examples.",
        )
        config.addinivalue_line(
            "markers",
            "usefixtures(fixturename1, fixturename2, ...): mark tests as needing "
            "all of the specified fixtures. see "
            "https://docs.pytest.org/en/latest/fixture.html#usefixtures ",
        )

    @hookimpl(trylast=True)
    def pytest_pyfunc_call(pyfuncitem):
        testfunction = pyfuncitem.obj
        iscoroutinefunction = getattr(inspect, "iscoroutinefunction", None)
        if iscoroutinefunction is not None and iscoroutinefunction(testfunction):
            msg = "Coroutine functions are not natively supported and have been skipped.\n"
            msg += "You need to install a suitable plugin for your async framework, for example:\n"
            msg += "  - pytest-asyncio\n"
            msg += "  - pytest-trio\n"
            msg += "  - pytest-tornasync"
            warnings.warn(PytestUnhandledCoroutineWarning(msg.format(pyfuncitem.nodeid)))
            skip(msg="coroutine function and no async plugin installed (see warnings)")
        funcargs = pyfuncitem.funcargs
        testargs = {arg: funcargs[arg] for arg in pyfuncitem._fixtureinfo.argnames}
        testfunction(**testargs)
        return True

    def pytest_collect_file(path, parent):
        ext = path.ext
        if ext == ".py":
            if not parent.session.isinitpath(path):
                if not path_matches_patterns(
                    path, parent.config.getini("python_files") + ["__init__.py"]
                ):
                    return
            ihook = parent.session.gethookproxy(path)
            return ihook.pytest_pycollect_makemodule(path=path, parent=parent)

    def path_matches_patterns(path, patterns):
        """Returns True if the given py.path.local matches one of the patterns in the list of globs given"""
        return any(path.fnmatch(pattern) for pattern in patterns)

    def pytest_pycollect_makemodule(path, parent):
        if path.basename == "__init__.py":
            return Package(path, parent)
        return Module(path, parent)

    @hookimpl(hookwrapper=True)
    def pytest_pycollect_makeitem(collector, name, obj):
        outcome = yield
        res = outcome.get_result()
        if res is not None:
            return
        # nothing was collected elsewhere, let's do it here
        if safe_isclass(obj):
            if collector.istestclass(obj, name):
                outcome.force_result(Class(name, parent=collector))
        elif collector.istestfunction(obj, name):
            # mock seems to store unbound methods (issue473), normalize it
            obj = getattr(obj, "__func__", obj)
            # We need to try and unwrap the function if it's a functools.partial
            # or a funtools.wrapped.
            # We musn't if it's been wrapped with mock.patch (python 2 only)
            if not (isfunction(obj) or isfunction(get_real_func(obj))):
                filename, lineno = getfslineno(obj)
                warnings.warn_explicit(
                    message=PytestCollectionWarning(
                        "cannot collect %r because it is not a function." % name
                    ),
                    category=None,
                    filename=str(filename),
                    lineno=lineno + 1,
                )
            elif getattr(obj, "__test__", True):
                if is_generator(obj):
                    res = Function(name, parent=collector)
                    reason = deprecated.YIELD_TESTS.format(name=name)
                    res.add_marker(MARK_GEN.xfail(run=False, reason=reason))
                    res.warn(PytestCollectionWarning(reason))
                else:
                    res = list(collector._genfunctions(name, obj))
                outcome.force_result(res)

    def pytest_make_parametrize_id(config, val, argname=None):
        return None

    class PyobjContext(object):
        module = pyobj_property("Module")
        cls = pyobj_property("Class")
        instance = pyobj_property("Instance")

    class PyobjMixin(PyobjContext):
        _ALLOW_MARKERS = True

        def __init__(self, *k, **kw):
            super(PyobjMixin, self).__init__(*k, **kw)

        @property
        def obj(self):
            """Underlying Python object."""
            obj = getattr(self, "_obj", None)
            if obj is None:
                self._obj = obj = self._getobj()
                # XXX evil hack
                # used to avoid Instance collector marker duplication
                if self._ALLOW_MARKERS:
                    self.own_markers.extend(get_unpacked_marks(self.obj))
            return obj

        @obj.setter
        def obj(self, value):
            self._obj = value

        def _getobj(self):
            """Gets the underlying Python object. May be overwritten by subclasses."""
            return getattr(self.parent.obj, self.name)

        def getmodpath(self, stopatmodule=True, includemodule=False):
            """ return python path relative to the containing module. """
            chain = self.listchain()
            chain.reverse()
            parts = []
            for node in chain:
                if isinstance(node, Instance):
                    continue
                name = node.name
                if isinstance(node, Module):
                    name = os.path.splitext(name)[0]
                    if stopatmodule:
                        if includemodule:
                            parts.append(name)
                        break
                parts.append(name)
            parts.reverse()
            s = ".".join(parts)
            return s.replace(".[", "[")

        def reportinfo(self):
            # XXX caching?
            obj = self.obj
            compat_co_firstlineno = getattr(obj, "compat_co_firstlineno", None)
            if isinstance(compat_co_firstlineno, int):
                # nose compatibility
                fspath = sys.modules[obj.__module__].__file__
                if fspath.endswith(".pyc"):
                    fspath = fspath[:-1]
                lineno = compat_co_firstlineno
            else:
                fspath, lineno = getfslineno(obj)
            modpath = self.getmodpath()
            assert isinstance(lineno, int)
            return fspath, lineno, modpath

    class PyCollector(PyobjMixin, nodes.Collector):
        def funcnamefilter(self, name):
            return self._matches_prefix_or_glob_option("python_functions", name)

        def isnosetest(self, obj):
            """ Look for the __test__ attribute, which is applied by the
            @nose.tools.istest decorator
            """
            # We explicitly check for "is True" here to not mistakenly treat
            # classes with a custom __getattr__ returning something truthy (like a
            # function) as test classes.
            return safe_getattr(obj, "__test__", False) is True

        def classnamefilter(self, name):
            return self._matches_prefix_or_glob_option("python_classes", name)

        def istestfunction(self, obj, name):
            if self.funcnamefilter(name) or self.isnosetest(obj):
                if isinstance(obj, staticmethod):
                    # static methods need to be unwrapped
                    obj = safe_getattr(obj, "__func__", False)
                return (
                    safe_getattr(obj, "__call__", False)
                    and fixtures.getfixturemarker(obj) is None
                )
            else:
                return False

        def istestclass(self, obj, name):
            return self.classnamefilter(name) or self.isnosetest(obj)

        def _matches_prefix_or_glob_option(self, option_name, name):
            """
            checks if the given name matches the prefix or glob-pattern defined
            in ini configuration.
            """
            for option in self.config.getini(option_name):
                if name.startswith(option):
                    return True
                # check that name looks like a glob-string before calling fnmatch
                # because this is called for every name in each collected module,
                # and fnmatch is somewhat expensive to call
                elif ("*" in option or "?" in option or "[" in option) and fnmatch.fnmatch(
                    name, option
                ):
                    return True
            return False

        def collect(self):
            if not getattr(self.obj, "__test__", True):
                return []

            # NB. we avoid random getattrs and peek in the __dict__ instead
            # (XXX originally introduced from a PyPy need, still true?)
            dicts = [getattr(self.obj, "__dict__", {})]
            for basecls in inspect.getmro(self.obj.__class__):
                dicts.append(basecls.__dict__)
            seen = {}
            values = []
            for dic in dicts:
                for name, obj in list(dic.items()):
                    if name in seen:
                        continue
                    seen[name] = True
                    res = self._makeitem(name, obj)
                    if res is None:
                        continue
                    if not isinstance(res, list):
                        res = [res]
                    values.extend(res)
            values.sort(key=lambda item: item.reportinfo()[:2])
            return values

        def _makeitem(self, name, obj):
            # assert self.ihook.fspath == self.fspath, self
            return self.ihook.pytest_pycollect_makeitem(collector=self, name=name, obj=obj)

        def _genfunctions(self, name, funcobj):
            module = self.getparent(Module).obj
            clscol = self.getparent(Class)
            cls = clscol and clscol.obj or None
            fm = self.session._fixturemanager

            definition = FunctionDefinition(name=name, parent=self, callobj=funcobj)
            fixtureinfo = fm.getfixtureinfo(definition, funcobj, cls)

            metafunc = Metafunc(
                definition, fixtureinfo, self.config, cls=cls, module=module
            )
            methods = []
            if hasattr(module, "pytest_generate_tests"):
                methods.append(module.pytest_generate_tests)
            if hasattr(cls, "pytest_generate_tests"):
                methods.append(cls().pytest_generate_tests)
            if methods:
                self.ihook.pytest_generate_tests.call_extra(
                    methods, dict(metafunc=metafunc)
                )
            else:
                self.ihook.pytest_generate_tests(metafunc=metafunc)

            if not metafunc._calls:
                yield Function(name, parent=self, fixtureinfo=fixtureinfo)
            else:
                # add funcargs() as fixturedefs to fixtureinfo.arg2fixturedefs
                fixtures.add_funcarg_pseudo_fixture_def(self, metafunc, fm)

                # add_funcarg_pseudo_fixture_def may have shadowed some fixtures
                # with direct parametrization, so make sure we update what the
                # function really needs.
                fixtureinfo.prune_dependency_tree()

                for callspec in metafunc._calls:
                    subname = "%s[%s]" % (name, callspec.id)
                    yield Function(
                        name=subname,
                        parent=self,
                        callspec=callspec,
                        callobj=funcobj,
                        fixtureinfo=fixtureinfo,
                        keywords={callspec.id: True},
                        originalname=name,
                    )

    class Module(nodes.File, PyCollector):
        """ Collector for test classes and functions. """

        def _getobj(self):
            return self._importtestmodule()

        def collect(self):
            self._inject_setup_module_fixture()
            self._inject_setup_function_fixture()
            self.session._fixturemanager.parsefactories(self)
            return super(Module, self).collect()

        def _inject_setup_module_fixture(self):
            """Injects a hidden autouse, module scoped fixture into the collected module object
            that invokes setUpModule/tearDownModule if either or both are available.

            Using a fixture to invoke this methods ensures we play nicely and unsurprisingly with
            other fixtures (#517).
            """
            setup_module = _get_non_fixture_func(self.obj, "setUpModule")
            if setup_module is None:
                setup_module = _get_non_fixture_func(self.obj, "setup_module")

            teardown_module = _get_non_fixture_func(self.obj, "tearDownModule")
            if teardown_module is None:
                teardown_module = _get_non_fixture_func(self.obj, "teardown_module")

            if setup_module is None and teardown_module is None:
                return

            @fixtures.fixture(autouse=True, scope="module")
            def xunit_setup_module_fixture(request):
                if setup_module is not None:
                    _call_with_optional_argument(setup_module, request.module)
                yield
                if teardown_module is not None:
                    _call_with_optional_argument(teardown_module, request.module)

            self.obj.__pytest_setup_module = xunit_setup_module_fixture

        def _inject_setup_function_fixture(self):
            """Injects a hidden autouse, function scoped fixture into the collected module object
            that invokes setup_function/teardown_function if either or both are available.

            Using a fixture to invoke this methods ensures we play nicely and unsurprisingly with
            other fixtures (#517).
            """
            setup_function = _get_non_fixture_func(self.obj, "setup_function")
            teardown_function = _get_non_fixture_func(self.obj, "teardown_function")
            if setup_function is None and teardown_function is None:
                return

            @fixtures.fixture(autouse=True, scope="function")
            def xunit_setup_function_fixture(request):
                if request.instance is not None:
                    # in this case we are bound to an instance, so we need to let
                    # setup_method handle this
                    yield
                    return
                if setup_function is not None:
                    _call_with_optional_argument(setup_function, request.function)
                yield
                if teardown_function is not None:
                    _call_with_optional_argument(teardown_function, request.function)

            self.obj.__pytest_setup_function = xunit_setup_function_fixture

        def _importtestmodule(self):
            # we assume we are only called once per module
            importmode = self.config.getoption("--import-mode")
            try:
                mod = self.fspath.pyimport(ensuresyspath=importmode)
            except SyntaxError:
                raise self.CollectError(
                    _pytest._code.ExceptionInfo.from_current().getrepr(style="short")
                )
            except self.fspath.ImportMismatchError:
                e = sys.exc_info()[1]
                raise self.CollectError(
                    "import file mismatch:\n"
                    "imported module %r has this __file__ attribute:\n"
                    "  %s\n"
                    "which is not the same as the test file we want to collect:\n"
                    "  %s\n"
                    "HINT: remove __pycache__ / .pyc files and/or use a "
                    "unique basename for your test file modules" % e.args
                )
            except ImportError:
                from _pytest._code.code import ExceptionInfo

                exc_info = ExceptionInfo.from_current()
                if self.config.getoption("verbose") < 2:
                    exc_info.traceback = exc_info.traceback.filter(filter_traceback)
                exc_repr = (
                    exc_info.getrepr(style="short")
                    if exc_info.traceback
                    else exc_info.exconly()
                )
                formatted_tb = safe_str(exc_repr)
                raise self.CollectError(
                    "ImportError while importing test module '{fspath}'.\n"
                    "Hint: make sure your test modules/packages have valid Python names.\n"
                    "Traceback:\n"
                    "{traceback}".format(fspath=self.fspath, traceback=formatted_tb)
                )
            except _pytest.runner.Skipped as e:
                if e.allow_module_level:
                    raise
                raise self.CollectError(
                    "Using pytest.skip outside of a test is not allowed. "
                    "To decorate a test function, use the @pytest.mark.skip "
                    "or @pytest.mark.skipif decorators instead, and to skip a "
                    "module use `pytestmark = pytest.mark.{skip,skipif}."
                )
            self.config.pluginmanager.consider_module(mod)
            return mod

    class Package(Module):
        def __init__(self, fspath, parent=None, config=None, session=None, nodeid=None):
            session = parent.session
            nodes.FSCollector.__init__(
                self, fspath, parent=parent, config=config, session=session, nodeid=nodeid
            )
            self.name = fspath.dirname
            self.trace = session.trace
            self._norecursepatterns = session._norecursepatterns
            self.fspath = fspath

        def setup(self):
            # not using fixtures to call setup_module here because autouse fixtures
            # from packages are not called automatically (#4085)
            setup_module = _get_non_fixture_func(self.obj, "setUpModule")
            if setup_module is None:
                setup_module = _get_non_fixture_func(self.obj, "setup_module")
            if setup_module is not None:
                _call_with_optional_argument(setup_module, self.obj)

            teardown_module = _get_non_fixture_func(self.obj, "tearDownModule")
            if teardown_module is None:
                teardown_module = _get_non_fixture_func(self.obj, "teardown_module")
            if teardown_module is not None:
                func = partial(_call_with_optional_argument, teardown_module, self.obj)
                self.addfinalizer(func)

        def _recurse(self, dirpath):
            if dirpath.basename == "__pycache__":
                return False
            ihook = self.gethookproxy(dirpath.dirpath())
            if ihook.pytest_ignore_collect(path=dirpath, config=self.config):
                return
            for pat in self._norecursepatterns:
                if dirpath.check(fnmatch=pat):
                    return False
            ihook = self.gethookproxy(dirpath)
            ihook.pytest_collect_directory(path=dirpath, parent=self)
            return True

        def gethookproxy(self, fspath):
            # check if we have the common case of running
            # hooks with all conftest.py filesall conftest.py
            pm = self.config.pluginmanager
            my_conftestmodules = pm._getconftestmodules(fspath)
            remove_mods = pm._conftest_plugins.difference(my_conftestmodules)
            if remove_mods:
                # one or more conftests are not in use at this fspath
                proxy = FSHookProxy(fspath, pm, remove_mods)
            else:
                # all plugis are active for this fspath
                proxy = self.config.hook
            return proxy

        def _collectfile(self, path, handle_dupes=True):
            assert path.isfile(), "%r is not a file (isdir=%r, exists=%r, islink=%r)" % (
                path,
                path.isdir(),
                path.exists(),
                path.islink(),
            )
            ihook = self.gethookproxy(path)
            if not self.isinitpath(path):
                if ihook.pytest_ignore_collect(path=path, config=self.config):
                    return ()

            if handle_dupes:
                keepduplicates = self.config.getoption("keepduplicates")
                if not keepduplicates:
                    duplicate_paths = self.config.pluginmanager._duplicatepaths
                    if path in duplicate_paths:
                        return ()
                    else:
                        duplicate_paths.add(path)

            if self.fspath == path:  # __init__.py
                return [self]

            return ihook.pytest_collect_file(path=path, parent=self)

        def isinitpath(self, path):
            return path in self.session._initialpaths

        def collect(self):
            this_path = self.fspath.dirpath()
            init_module = this_path.join("__init__.py")
            if init_module.check(file=1) and path_matches_patterns(
                init_module, self.config.getini("python_files")
            ):
                yield Module(init_module, self)
            pkg_prefixes = set()
            for path in this_path.visit(rec=self._recurse, bf=True, sort=True):
                # We will visit our own __init__.py file, in which case we skip it.
                is_file = path.isfile()
                if is_file:
                    if path.basename == "__init__.py" and path.dirpath() == this_path:
                        continue

                parts_ = parts(path.strpath)
                if any(
                    pkg_prefix in parts_ and pkg_prefix.join("__init__.py") != path
                    for pkg_prefix in pkg_prefixes
                ):
                    continue

                if is_file:
                    for x in self._collectfile(path):
                        yield x
                elif not path.isdir():
                    # Broken symlink or invalid/missing file.
                    continue
                elif path.join("__init__.py").check(file=1):
                    pkg_prefixes.add(path)

    def _get_xunit_setup_teardown(holder, attr_name, param_obj=None):
        """
        Return a callable to perform xunit-style setup or teardown if
        the function exists in the ``holder`` object.
        The ``param_obj`` parameter is the parameter which will be passed to the function
        when the callable is called without arguments, defaults to the ``holder`` object.
        Return ``None`` if a suitable callable is not found.
        """
        # TODO: only needed because of Package!
        param_obj = param_obj if param_obj is not None else holder
        result = _get_non_fixture_func(holder, attr_name)
        if result is not None:
            arg_count = result.__code__.co_argcount
            if inspect.ismethod(result):
                arg_count -= 1
            if arg_count:
                return lambda: result(param_obj)
            else:
                return result

    def _call_with_optional_argument(func, arg):
        """Call the given function with the given argument if func accepts one argument, otherwise
        calls func without arguments"""
        arg_count = func.__code__.co_argcount
        if inspect.ismethod(func):
            arg_count -= 1
        if arg_count:
            func(arg)
        else:
            func()

    def _get_non_fixture_func(obj, name):
        """Return the attribute from the given object to be used as a setup/teardown
        xunit-style function, but only if not marked as a fixture to
        avoid calling it twice.
        """
        meth = getattr(obj, name, None)
        if fixtures.getfixturemarker(meth) is None:
            return meth

    class Class(PyCollector):
        """ Collector for test methods. """

        def collect(self):
            if not safe_getattr(self.obj, "__test__", True):
                return []
            if hasinit(self.obj):
                self.warn(
                    PytestCollectionWarning(
                        "cannot collect test class %r because it has a "
                        "__init__ constructor (from: %s)"
                        % (self.obj.__name__, self.parent.nodeid)
                    )
                )
                return []
            elif hasnew(self.obj):
                self.warn(
                    PytestCollectionWarning(
                        "cannot collect test class %r because it has a "
                        "__new__ constructor (from: %s)"
                        % (self.obj.__name__, self.parent.nodeid)
                    )
                )
                return []

            self._inject_setup_class_fixture()
            self._inject_setup_method_fixture()

            return [Instance(name="()", parent=self)]

        def _inject_setup_class_fixture(self):
            """Injects a hidden autouse, class scoped fixture into the collected class object
            that invokes setup_class/teardown_class if either or both are available.

            Using a fixture to invoke this methods ensures we play nicely and unsurprisingly with
            other fixtures (#517).
            """
            setup_class = _get_non_fixture_func(self.obj, "setup_class")
            teardown_class = getattr(self.obj, "teardown_class", None)
            if setup_class is None and teardown_class is None:
                return

            @fixtures.fixture(autouse=True, scope="class")
            def xunit_setup_class_fixture(cls):
                if setup_class is not None:
                    func = getimfunc(setup_class)
                    _call_with_optional_argument(func, self.obj)
                yield
                if teardown_class is not None:
                    func = getimfunc(teardown_class)
                    _call_with_optional_argument(func, self.obj)

            self.obj.__pytest_setup_class = xunit_setup_class_fixture

        def _inject_setup_method_fixture(self):
            """Injects a hidden autouse, function scoped fixture into the collected class object
            that invokes setup_method/teardown_method if either or both are available.

            Using a fixture to invoke this methods ensures we play nicely and unsurprisingly with
            other fixtures (#517).
            """
            setup_method = _get_non_fixture_func(self.obj, "setup_method")
            teardown_method = getattr(self.obj, "teardown_method", None)
            if setup_method is None and teardown_method is None:
                return

            @fixtures.fixture(autouse=True, scope="function")
            def xunit_setup_method_fixture(self, request):
                method = request.function
                if setup_method is not None:
                    func = getattr(self, "setup_method")
                    _call_with_optional_argument(func, method)
                yield
                if teardown_method is not None:
                    func = getattr(self, "teardown_method")
                    _call_with_optional_argument(func, method)

            self.obj.__pytest_setup_method = xunit_setup_method_fixture

    class Instance(PyCollector):
        _ALLOW_MARKERS = False  # hack, destroy later
        # instances share the object with their parents in a way
        # that duplicates markers instances if not taken out
        # can be removed at node structure reorganization time

        def _getobj(self):
            return self.parent.obj()

        def collect(self):
            self.session._fixturemanager.parsefactories(self)
            return super(Instance, self).collect()

        def newinstance(self):
            self.obj = self._getobj()
            return self.obj

    class FunctionMixin(PyobjMixin):
        """ mixin for the code common to Function and Generator.
        """

        def setup(self):
            """ perform setup for this test function. """
            if isinstance(self.parent, Instance):
                self.parent.newinstance()
                self.obj = self._getobj()

        def _prunetraceback(self, excinfo):
            if hasattr(self, "_obj") and not self.config.getoption("fulltrace", False):
                code = _pytest._code.Code(get_real_func(self.obj))
                path, firstlineno = code.path, code.firstlineno
                traceback = excinfo.traceback
                ntraceback = traceback.cut(path=path, firstlineno=firstlineno)
                if ntraceback == traceback:
                    ntraceback = ntraceback.cut(path=path)
                    if ntraceback == traceback:
                        ntraceback = ntraceback.filter(filter_traceback)
                        if not ntraceback:
                            ntraceback = traceback

                excinfo.traceback = ntraceback.filter()
                # issue364: mark all but first and last frames to
                # only show a single-line message for each frame
                if self.config.getoption("tbstyle", "auto") == "auto":
                    if len(excinfo.traceback) > 2:
                        for entry in excinfo.traceback[1:-1]:
                            entry.set_repr_style("short")

        def repr_failure(self, excinfo, outerr=None):
            assert outerr is None, "XXX outerr usage is deprecated"
            style = self.config.getoption("tbstyle", "auto")
            if style == "auto":
                style = "long"
            return self._repr_failure_py(excinfo, style=style)

    def hasinit(obj):
        init = getattr(obj, "__init__", None)
        if init:
            return init != object.__init__

    def hasnew(obj):
        new = getattr(obj, "__new__", None)
        if new:
            return new != object.__new__

    class CallSpec2(object):
        def __init__(self, metafunc):
            self.metafunc = metafunc
            self.funcargs = {}
            self._idlist = []
            self.params = {}
            self._globalid = NOTSET
            self._globalparam = NOTSET
            self._arg2scopenum = {}  # used for sorting parametrized resources
            self.marks = []
            self.indices = {}

        def copy(self):
            cs = CallSpec2(self.metafunc)
            cs.funcargs.update(self.funcargs)
            cs.params.update(self.params)
            cs.marks.extend(self.marks)
            cs.indices.update(self.indices)
            cs._arg2scopenum.update(self._arg2scopenum)
            cs._idlist = list(self._idlist)
            cs._globalid = self._globalid
            cs._globalparam = self._globalparam
            return cs

        def _checkargnotcontained(self, arg):
            if arg in self.params or arg in self.funcargs:
                raise ValueError("duplicate %r" % (arg,))

        def getparam(self, name):
            try:
                return self.params[name]
            except KeyError:
                if self._globalparam is NOTSET:
                    raise ValueError(name)
                return self._globalparam

        @property
        def id(self):
            return "-".join(map(str, filter(None, self._idlist)))

        def setmulti2(self, valtypes, argnames, valset, id, marks, scopenum, param_index):
            for arg, val in zip(argnames, valset):
                self._checkargnotcontained(arg)
                valtype_for_arg = valtypes[arg]
                getattr(self, valtype_for_arg)[arg] = val
                self.indices[arg] = param_index
                self._arg2scopenum[arg] = scopenum
            self._idlist.append(id)
            self.marks.extend(normalize_mark_list(marks))

        def setall(self, funcargs, id, param):
            for x in funcargs:
                self._checkargnotcontained(x)
            self.funcargs.update(funcargs)
            if id is not NOTSET:
                self._idlist.append(id)
            if param is not NOTSET:
                assert self._globalparam is NOTSET
                self._globalparam = param
            for arg in funcargs:
                self._arg2scopenum[arg] = fixtures.scopenum_function

    class Metafunc(fixtures.FuncargnamesCompatAttr):
        """
        Metafunc objects are passed to the :func:`pytest_generate_tests <_pytest.hookspec.pytest_generate_tests>` hook.
        They help to inspect a test function and to generate tests according to
        test configuration or values specified in the class or module where a
        test function is defined.
        """

        def __init__(self, definition, fixtureinfo, config, cls=None, module=None):
            assert (
                isinstance(definition, FunctionDefinition)
                or type(definition).__name__ == "DefinitionMock"
            )
            self.definition = definition

            #: access to the :class:`_pytest.config.Config` object for the test session
            self.config = config

            #: the module object where the test function is defined in.
            self.module = module

            #: underlying python test function
            self.function = definition.obj

            #: set of fixture names required by the test function
            self.fixturenames = fixtureinfo.names_closure

            #: class object where the test function is defined in or ``None``.
            self.cls = cls

            self._calls = []
            self._ids = set()
            self._arg2fixturedefs = fixtureinfo.name2fixturedefs

        def parametrize(self, argnames, argvalues, indirect=False, ids=None, scope=None):
            """ Add new invocations to the underlying test function using the list
            of argvalues for the given argnames.  Parametrization is performed
            during the collection phase.  If you need to setup expensive resources
            see about setting indirect to do it rather at test setup time.

            :arg argnames: a comma-separated string denoting one or more argument
                           names, or a list/tuple of argument strings.

            :arg argvalues: The list of argvalues determines how often a
                test is invoked with different argument values.  If only one
                argname was specified argvalues is a list of values.  If N
                argnames were specified, argvalues must be a list of N-tuples,
                where each tuple-element specifies a value for its respective
                argname.

            :arg indirect: The list of argnames or boolean. A list of arguments'
                names (subset of argnames). If True the list contains all names from
                the argnames. Each argvalue corresponding to an argname in this list will
                be passed as request.param to its respective argname fixture
                function so that it can perform more expensive setups during the
                setup phase of a test rather than at collection time.

            :arg ids: list of string ids, or a callable.
                If strings, each is corresponding to the argvalues so that they are
                part of the test id. If None is given as id of specific test, the
                automatically generated id for that argument will be used.
                If callable, it should take one argument (a single argvalue) and return
                a string or return None. If None, the automatically generated id for that
                argument will be used.
                If no ids are provided they will be generated automatically from
                the argvalues.

            :arg scope: if specified it denotes the scope of the parameters.
                The scope is used for grouping tests by parameter instances.
                It will also override any fixture-function defined scope, allowing
                to set a dynamic scope using test context or configuration.
            """
            from _pytest.fixtures import scope2index
            from _pytest.mark import ParameterSet

            argnames, parameters = ParameterSet._for_parametrize(
                argnames,
                argvalues,
                self.function,
                self.config,
                function_definition=self.definition,
            )
            del argvalues

            if scope is None:
                scope = _find_parametrized_scope(argnames, self._arg2fixturedefs, indirect)

            self._validate_if_using_arg_names(argnames, indirect)

            arg_values_types = self._resolve_arg_value_types(argnames, indirect)

            ids = self._resolve_arg_ids(argnames, ids, parameters, item=self.definition)

            scopenum = scope2index(
                scope, descr="parametrize() call in {}".format(self.function.__name__)
            )

            # create the new calls: if we are parametrize() multiple times (by applying the decorator
            # more than once) then we accumulate those calls generating the cartesian product
            # of all calls
            newcalls = []
            for callspec in self._calls or [CallSpec2(self)]:
                for param_index, (param_id, param_set) in enumerate(zip(ids, parameters)):
                    newcallspec = callspec.copy()
                    newcallspec.setmulti2(
                        arg_values_types,
                        argnames,
                        param_set.values,
                        param_id,
                        param_set.marks,
                        scopenum,
                        param_index,
                    )
                    newcalls.append(newcallspec)
            self._calls = newcalls

        def _resolve_arg_ids(self, argnames, ids, parameters, item):
            """Resolves the actual ids for the given argnames, based on the ``ids`` parameter given
            to ``parametrize``.

            :param List[str] argnames: list of argument names passed to ``parametrize()``.
            :param ids: the ids parameter of the parametrized call (see docs).
            :param List[ParameterSet] parameters: the list of parameter values, same size as ``argnames``.
            :param Item item: the item that generated this parametrized call.
            :rtype: List[str]
            :return: the list of ids for each argname given
            """
            from _pytest._io.saferepr import saferepr

            idfn = None
            if callable(ids):
                idfn = ids
                ids = None
            if ids:
                func_name = self.function.__name__
                if len(ids) != len(parameters):
                    msg = "In {}: {} parameter sets specified, with different number of ids: {}"
                    fail(msg.format(func_name, len(parameters), len(ids)), pytrace=False)
                for id_value in ids:
                    if id_value is not None and not isinstance(id_value, six.string_types):
                        msg = "In {}: ids must be list of strings, found: {} (type: {!r})"
                        fail(
                            msg.format(func_name, saferepr(id_value), type(id_value)),
                            pytrace=False,
                        )
            ids = idmaker(argnames, parameters, idfn, ids, self.config, item=item)
            return ids

        def _resolve_arg_value_types(self, argnames, indirect):
            """Resolves if each parametrized argument must be considered a parameter to a fixture or a "funcarg"
            to the function, based on the ``indirect`` parameter of the parametrized() call.

            :param List[str] argnames: list of argument names passed to ``parametrize()``.
            :param indirect: same ``indirect`` parameter of ``parametrize()``.
            :rtype: Dict[str, str]
                A dict mapping each arg name to either:
                * "params" if the argname should be the parameter of a fixture of the same name.
                * "funcargs" if the argname should be a parameter to the parametrized test function.
            """
            valtypes = {}
            if indirect is True:
                valtypes = dict.fromkeys(argnames, "params")
            elif indirect is False:
                valtypes = dict.fromkeys(argnames, "funcargs")
            elif isinstance(indirect, (tuple, list)):
                valtypes = dict.fromkeys(argnames, "funcargs")
                for arg in indirect:
                    if arg not in argnames:
                        fail(
                            "In {}: indirect fixture '{}' doesn't exist".format(
                                self.function.__name__, arg
                            ),
                            pytrace=False,
                        )
                    valtypes[arg] = "params"
            return valtypes

        def _validate_if_using_arg_names(self, argnames, indirect):
            """
            Check if all argnames are being used, by default values, or directly/indirectly.

            :param List[str] argnames: list of argument names passed to ``parametrize()``.
            :param indirect: same ``indirect`` parameter of ``parametrize()``.
            :raise ValueError: if validation fails.
            """
            default_arg_names = set(get_default_arg_names(self.function))
            func_name = self.function.__name__
            for arg in argnames:
                if arg not in self.fixturenames:
                    if arg in default_arg_names:
                        fail(
                            "In {}: function already takes an argument '{}' with a default value".format(
                                func_name, arg
                            ),
                            pytrace=False,
                        )
                    else:
                        if isinstance(indirect, (tuple, list)):
                            name = "fixture" if arg in indirect else "argument"
                        else:
                            name = "fixture" if indirect else "argument"
                        fail(
                            "In {}: function uses no {} '{}'".format(func_name, name, arg),
                            pytrace=False,
                        )

    def _find_parametrized_scope(argnames, arg2fixturedefs, indirect):
        """Find the most appropriate scope for a parametrized call based on its arguments.

        When there's at least one direct argument, always use "function" scope.

        When a test function is parametrized and all its arguments are indirect
        (e.g. fixtures), return the most narrow scope based on the fixtures used.

        Related to issue #1832, based on code posted by @Kingdread.
        """
        from _pytest.fixtures import scopes

        if isinstance(indirect, (list, tuple)):
            all_arguments_are_fixtures = len(indirect) == len(argnames)
        else:
            all_arguments_are_fixtures = bool(indirect)

        if all_arguments_are_fixtures:
            fixturedefs = arg2fixturedefs or {}
            used_scopes = [
                fixturedef[0].scope
                for name, fixturedef in fixturedefs.items()
                if name in argnames
            ]
            if used_scopes:
                # Takes the most narrow scope from used fixtures
                for scope in reversed(scopes):
                    if scope in used_scopes:
                        return scope

        return "function"

    def _ascii_escaped_by_config(val, config):
        if config is None:
            escape_option = False
        else:
            escape_option = config.getini(
                "disable_test_id_escaping_and_forfeit_all_rights_to_community_support"
            )
        return val if escape_option else ascii_escaped(val)

    def _idval(val, argname, idx, idfn, item, config):
        if idfn:
            try:
                generated_id = idfn(val)
                if generated_id is not None:
                    val = generated_id
            except Exception as e:
                # See issue https://github.com/pytest-dev/pytest/issues/2169
                msg = "{}: error raised while trying to determine id of parameter '{}' at position {}\n"
                msg = msg.format(item.nodeid, argname, idx)
                # we only append the exception type and message because on Python 2 reraise does nothing
                msg += "  {}: {}\n".format(type(e).__name__, e)
                six.raise_from(ValueError(msg), e)
        elif config:
            hook_id = config.hook.pytest_make_parametrize_id(
                config=config, val=val, argname=argname
            )
            if hook_id:
                return hook_id

        if isinstance(val, STRING_TYPES):
            return _ascii_escaped_by_config(val, config)
        elif val is None or isinstance(val, (float, int, bool)):
            return str(val)
        elif isinstance(val, REGEX_TYPE):
            return ascii_escaped(val.pattern)
        elif enum is not None and isinstance(val, enum.Enum):
            return str(val)
        elif (isclass(val) or isfunction(val)) and hasattr(val, "__name__"):
            return val.__name__
        return str(argname) + str(idx)

    def _idvalset(idx, parameterset, argnames, idfn, ids, item, config):
        if parameterset.id is not None:
            return parameterset.id
        if ids is None or (idx >= len(ids) or ids[idx] is None):
            this_id = [
                _idval(val, argname, idx, idfn, item=item, config=config)
                for val, argname in zip(parameterset.values, argnames)
            ]
            return "-".join(this_id)
        else:
            return _ascii_escaped_by_config(ids[idx], config)

    def idmaker(argnames, parametersets, idfn=None, ids=None, config=None, item=None):
        ids = [
            _idvalset(valindex, parameterset, argnames, idfn, ids, config=config, item=item)
            for valindex, parameterset in enumerate(parametersets)
        ]
        if len(set(ids)) != len(ids):
            # The ids are not unique
            duplicates = [testid for testid in ids if ids.count(testid) > 1]
            counters = collections.defaultdict(lambda: 0)
            for index, testid in enumerate(ids):
                if testid in duplicates:
                    ids[index] = testid + str(counters[testid])
                    counters[testid] += 1
        return ids

    def show_fixtures_per_test(config):
        from _pytest.main import wrap_session

        return wrap_session(config, _show_fixtures_per_test)

    def _show_fixtures_per_test(config, session):
        import _pytest.config

        session.perform_collect()
        curdir = py.path.local()
        tw = _pytest.config.create_terminal_writer(config)
        verbose = config.getvalue("verbose")

        def get_best_relpath(func):
            loc = getlocation(func, curdir)
            return curdir.bestrelpath(loc)

        def write_fixture(fixture_def):
            argname = fixture_def.argname
            if verbose <= 0 and argname.startswith("_"):
                return
            if verbose > 0:
                bestrel = get_best_relpath(fixture_def.func)
                funcargspec = "{} -- {}".format(argname, bestrel)
            else:
                funcargspec = argname
            tw.line(funcargspec, green=True)
            fixture_doc = fixture_def.func.__doc__
            if fixture_doc:
                write_docstring(tw, fixture_doc)
            else:
                tw.line("    no docstring available", red=True)

        def write_item(item):
            try:
                info = item._fixtureinfo
            except AttributeError:
                # doctests items have no _fixtureinfo attribute
                return
            if not info.name2fixturedefs:
                # this test item does not use any fixtures
                return
            tw.line()
            tw.sep("-", "fixtures used by {}".format(item.name))
            tw.sep("-", "({})".format(get_best_relpath(item.function)))
            # dict key not used in loop but needed for sorting
            for _, fixturedefs in sorted(info.name2fixturedefs.items()):
                assert fixturedefs is not None
                if not fixturedefs:
                    continue
                # last item is expected to be the one used by the test item
                write_fixture(fixturedefs[-1])

        for session_item in session.items:
            write_item(session_item)

    def showfixtures(config):
        from _pytest.main import wrap_session

        return wrap_session(config, _showfixtures_main)

    def _showfixtures_main(config, session):
        import _pytest.config

        session.perform_collect()
        curdir = py.path.local()
        tw = _pytest.config.create_terminal_writer(config)
        verbose = config.getvalue("verbose")

        fm = session._fixturemanager

        available = []
        seen = set()

        for argname, fixturedefs in fm._arg2fixturedefs.items():
            assert fixturedefs is not None
            if not fixturedefs:
                continue
            for fixturedef in fixturedefs:
                loc = getlocation(fixturedef.func, curdir)
                if (fixturedef.argname, loc) in seen:
                    continue
                seen.add((fixturedef.argname, loc))
                available.append(
                    (
                        len(fixturedef.baseid),
                        fixturedef.func.__module__,
                        curdir.bestrelpath(loc),
                        fixturedef.argname,
                        fixturedef,
                    )
                )

        available.sort()
        currentmodule = None
        for baseid, module, bestrel, argname, fixturedef in available:
            if currentmodule != module:
                if not module.startswith("_pytest."):
                    tw.line()
                    tw.sep("-", "fixtures defined from %s" % (module,))
                    currentmodule = module
            if verbose <= 0 and argname[0] == "_":
                continue
            tw.write(argname, green=True)
            if fixturedef.scope != "function":
                tw.write(" [%s scope]" % fixturedef.scope, cyan=True)
            if verbose > 0:
                tw.write(" -- %s" % bestrel, yellow=True)
            tw.write("\n")
            loc = getlocation(fixturedef.func, curdir)
            doc = fixturedef.func.__doc__ or ""
            if doc:
                write_docstring(tw, doc)
            else:
                tw.line("    %s: no docstring available" % (loc,), red=True)
            tw.line()

    def write_docstring(tw, doc, indent="    "):
        doc = doc.rstrip()
        if "\n" in doc:
            firstline, rest = doc.split("\n", 1)
        else:
            firstline, rest = doc, ""

        if firstline.strip():
            tw.line(indent + firstline.strip())

        if rest:
            for line in dedent(rest).split("\n"):
                tw.write(indent + line + "\n")

    class Function(FunctionMixin, nodes.Item, fixtures.FuncargnamesCompatAttr):
        """ a Function Item is responsible for setting up and executing a
        Python test function.
        """

        # disable since functions handle it themselves
        _ALLOW_MARKERS = False

        def __init__(
            self,
            name,
            parent,
            args=None,
            config=None,
            callspec=None,
            callobj=NOTSET,
            keywords=None,
            session=None,
            fixtureinfo=None,
            originalname=None,
        ):
            super(Function, self).__init__(name, parent, config=config, session=session)
            self._args = args
            if callobj is not NOTSET:
                self.obj = callobj

            self.keywords.update(self.obj.__dict__)
            self.own_markers.extend(get_unpacked_marks(self.obj))
            if callspec:
                self.callspec = callspec
                # this is total hostile and a mess
                # keywords are broken by design by now
                # this will be redeemed later
                for mark in callspec.marks:
                    # feel free to cry, this was broken for years before
                    # and keywords cant fix it per design
                    self.keywords[mark.name] = mark
                self.own_markers.extend(normalize_mark_list(callspec.marks))
            if keywords:
                self.keywords.update(keywords)

            # todo: this is a hell of a hack
            # https://github.com/pytest-dev/pytest/issues/4569

            self.keywords.update(
                dict.fromkeys(
                    [
                        mark.name
                        for mark in self.iter_markers()
                        if mark.name not in self.keywords
                    ],
                    True,
                )
            )

            if fixtureinfo is None:
                fixtureinfo = self.session._fixturemanager.getfixtureinfo(
                    self, self.obj, self.cls, funcargs=True
                )
            self._fixtureinfo = fixtureinfo
            self.fixturenames = fixtureinfo.names_closure
            self._initrequest()

            #: original function name, without any decorations (for example
            #: parametrization adds a ``"[...]"`` suffix to function names).
            #:
            #: .. versionadded:: 3.0
            self.originalname = originalname

        def _initrequest(self):
            self.funcargs = {}
            self._request = fixtures.FixtureRequest(self)

        @property
        def function(self):
            "underlying python 'function' object"
            return getimfunc(self.obj)

        def _getobj(self):
            name = self.name
            i = name.find("[")  # parametrization
            if i != -1:
                name = name[:i]
            return getattr(self.parent.obj, name)

        @property
        def _pyfuncitem(self):
            "(compatonly) for code expecting pytest-2.2 style request objects"
            return self

        def runtest(self):
            """ execute the underlying test function. """
            self.ihook.pytest_pyfunc_call(pyfuncitem=self)

        def setup(self):
            super(Function, self).setup()
            fixtures.fillfixtures(self)

    class FunctionDefinition(Function):
        """
        internal hack until we get actual definition nodes instead of the
        crappy metafunc hack
        """

        def runtest(self):
            raise RuntimeError("function definitions are not supposed to be used")

        setup = runtest