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"""Discover and run std-library "unittest" style tests."""
import sys
import traceback
import types
from typing import Any
from typing import Callable
from typing import Generator
from typing import Iterable
from typing import List
from typing import Optional
from typing import Tuple
from typing import Type
from typing import TYPE_CHECKING
from typing import Union

import _pytest._code
import pytest
from _pytest.compat import getimfunc
from _pytest.compat import is_async_function
from _pytest.config import hookimpl
from _pytest.fixtures import FixtureRequest
from _pytest.nodes import Collector
from _pytest.nodes import Item
from _pytest.outcomes import exit
from _pytest.outcomes import fail
from _pytest.outcomes import skip
from _pytest.outcomes import xfail
from _pytest.python import Class
from _pytest.python import Function
from _pytest.python import Module
from _pytest.runner import CallInfo
from _pytest.scope import Scope

if TYPE_CHECKING:
    import unittest
    import twisted.trial.unittest

_SysExcInfoType = Union[
        Tuple[Type[BaseException], BaseException, types.TracebackType],
        Tuple[None, None, None],
    ]

def pytest_pycollect_makeitem(
    collector: Union[Module, Class], name: str, obj: object
) -> Optional["UnitTestCase"]:
    # Has unittest been imported and is obj a subclass of its TestCase?
    try:
        ut = sys.modules["unittest"]
        # Type ignored because `ut` is an opaque module.
        if not issubclass(obj, ut.TestCase):  # type: ignore
            return None
    except Exception:
        return None
    # Yes, so let's collect it.
    item: UnitTestCase = UnitTestCase.from_parent(collector, name=name, obj=obj)
    return item

class UnitTestCase(Class):
    # Marker for fixturemanger.getfixtureinfo()
    # to declare that our children do not support funcargs.
    nofuncargs = True

def collect(self) -> Iterable[Union[Item, Collector]]:
        from unittest import TestLoader

cls = self.obj
        if not getattr(cls, "__test__", True):
            return

skipped = _is_skipped(cls)
        if not skipped:
            self._inject_setup_teardown_fixtures(cls)
            self._inject_setup_class_fixture()

self.session._fixturemanager.parsefactories(self, unittest=True)
        loader = TestLoader()
        foundsomething = False
        for name in loader.getTestCaseNames(self.obj):
            x = getattr(self.obj, name)
            if not getattr(x, "__test__", True):
                continue
            funcobj = getimfunc(x)
            yield TestCaseFunction.from_parent(self, name=name, callobj=funcobj)
            foundsomething = True

if not foundsomething:
            runtest = getattr(self.obj, "runTest", None)
            if runtest is not None:
                ut = sys.modules.get("twisted.trial.unittest", None)
                # Type ignored because `ut` is an opaque module.
                if ut is None or runtest != ut.TestCase.runTest:  # type: ignore
                    yield TestCaseFunction.from_parent(self, name="runTest")

def _inject_setup_teardown_fixtures(self, cls: type) -> None:
        """Injects a hidden auto-use fixture to invoke setUpClass/setup_method and corresponding
        teardown functions (#517)."""
        class_fixture = _make_xunit_fixture(
            cls,
            "setUpClass",
            "tearDownClass",
            "doClassCleanups",
            scope=Scope.Class,
            pass_self=False,
        )
        if class_fixture:
            cls.__pytest_class_setup = class_fixture  # type: ignore[attr-defined]

method_fixture = _make_xunit_fixture(
            cls,
            "setup_method",
            "teardown_method",
            None,
            scope=Scope.Function,
            pass_self=True,
        )
        if method_fixture:
            cls.__pytest_method_setup = method_fixture  # type: ignore[attr-defined]

def _make_xunit_fixture(
    obj: type,
    setup_name: str,
    teardown_name: str,
    cleanup_name: Optional[str],
    scope: Scope,
    pass_self: bool,
):
    setup = getattr(obj, setup_name, None)
    teardown = getattr(obj, teardown_name, None)
    if setup is None and teardown is None:
        return None

if cleanup_name:
        cleanup = getattr(obj, cleanup_name, lambda *args: None)
    else:

def cleanup(*args):
            pass

@pytest.fixture(
        scope=scope.value,
        autouse=True,
        # Use a unique name to speed up lookup.
        name=f"_unittest_{setup_name}_fixture_{obj.__qualname__}",
    )
    def fixture(self, request: FixtureRequest) -> Generator[None, None, None]:
        if _is_skipped(self):
            reason = self.__unittest_skip_why__
            raise pytest.skip.Exception(reason, _use_item_location=True)
        if setup is not None:
            try:
                if pass_self:
                    setup(self, request.function)
                else:
                    setup()
            # unittest does not call the cleanup function for every BaseException, so we
            # follow this here.
            except Exception:
                if pass_self:
                    cleanup(self)
                else:
                    cleanup()

raise
        yield
        try:
            if teardown is not None:
                if pass_self:
                    teardown(self, request.function)
                else:
                    teardown()
        finally:
            if pass_self:
                cleanup(self)
            else:
                cleanup()

return fixture

class TestCaseFunction(Function):
    nofuncargs = True
    _excinfo: Optional[List[_pytest._code.ExceptionInfo[BaseException]]] = None
    _testcase: Optional["unittest.TestCase"] = None

def _getobj(self):
        assert self.parent is not None
        # Unlike a regular Function in a Class, where `item.obj` returns
        # a *bound* method (attached to an instance), TestCaseFunction's
        # `obj` returns an *unbound* method (not attached to an instance).
        # This inconsistency is probably not desirable, but needs some
        # consideration before changing.
        return getattr(self.parent.obj, self.originalname)  # type: ignore[attr-defined]

def setup(self) -> None:
        # A bound method to be called during teardown() if set (see 'runtest()').
        self._explicit_tearDown: Optional[Callable[[], None]] = None
        assert self.parent is not None
        self._testcase = self.parent.obj(self.name)  # type: ignore[attr-defined]
        self._obj = getattr(self._testcase, self.name)
        if hasattr(self, "_request"):
            self._request._fillfixtures()

def teardown(self) -> None:
        if self._explicit_tearDown is not None:
            self._explicit_tearDown()
            self._explicit_tearDown = None
        self._testcase = None
        self._obj = None

def startTest(self, testcase: "unittest.TestCase") -> None:
        pass

def _addexcinfo(self, rawexcinfo: "_SysExcInfoType") -> None:
        # Unwrap potential exception info (see twisted trial support below).
        rawexcinfo = getattr(rawexcinfo, "_rawexcinfo", rawexcinfo)
        try:
            excinfo = _pytest._code.ExceptionInfo[BaseException].from_exc_info(rawexcinfo)  # type: ignore[arg-type]
            # Invoke the attributes to trigger storing the traceback
            # trial causes some issue there.
            excinfo.value
            excinfo.traceback
        except TypeError:
            try:
                try:
                    values = traceback.format_exception(*rawexcinfo)
                    values.insert(
                        0,
                        "NOTE: Incompatible Exception Representation, "
                        "displaying natively:\n\n",
                    )
                    fail("".join(values), pytrace=False)
                except (fail.Exception, KeyboardInterrupt):
                    raise
                except BaseException:
                    fail(
                        "ERROR: Unknown Incompatible Exception "
                        "representation:\n%r" % (rawexcinfo,),
                        pytrace=False,
                    )
            except KeyboardInterrupt:
                raise
            except fail.Exception:
                excinfo = _pytest._code.ExceptionInfo.from_current()
        self.__dict__.setdefault("_excinfo", []).append(excinfo)

def addError(
        self, testcase: "unittest.TestCase", rawexcinfo: "_SysExcInfoType"
    ) -> None:
        try:
            if isinstance(rawexcinfo[1], exit.Exception):
                exit(rawexcinfo[1].msg)
        except TypeError:
            pass
        self._addexcinfo(rawexcinfo)

def addFailure(
        self, testcase: "unittest.TestCase", rawexcinfo: "_SysExcInfoType"
    ) -> None:
        self._addexcinfo(rawexcinfo)

def addSkip(self, testcase: "unittest.TestCase", reason: str) -> None:
        try:
            raise pytest.skip.Exception(reason, _use_item_location=True)
        except skip.Exception:
            self._addexcinfo(sys.exc_info())

def addExpectedFailure(
        self,
        testcase: "unittest.TestCase",
        rawexcinfo: "_SysExcInfoType",
        reason: str = "",
    ) -> None:
        try:
            xfail(str(reason))
        except xfail.Exception:
            self._addexcinfo(sys.exc_info())

def addUnexpectedSuccess(
        self,
        testcase: "unittest.TestCase",
        reason: Optional["twisted.trial.unittest.Todo"] = None,
    ) -> None:
        msg = "Unexpected success"
        if reason:
            msg += f": {reason.reason}"
        # Preserve unittest behaviour - fail the test. Explicitly not an XPASS.
        try:
            fail(msg, pytrace=False)
        except fail.Exception:
            self._addexcinfo(sys.exc_info())

def addSuccess(self, testcase: "unittest.TestCase") -> None:
        pass

def stopTest(self, testcase: "unittest.TestCase") -> None:
        pass

def addDuration(self, testcase: "unittest.TestCase", elapsed: float) -> None:
        pass

def runtest(self) -> None:
        from _pytest.debugging import maybe_wrap_pytest_function_for_tracing

assert self._testcase is not None

maybe_wrap_pytest_function_for_tracing(self)

# Let the unittest framework handle async functions.
        if is_async_function(self.obj):
            # Type ignored because self acts as the TestResult, but is not actually one.
            self._testcase(result=self)  # type: ignore[arg-type]
        else:
            # When --pdb is given, we want to postpone calling tearDown() otherwise
            # when entering the pdb prompt, tearDown() would have probably cleaned up
            # instance variables, which makes it difficult to debug.
            # Arguably we could always postpone tearDown(), but this changes the moment where the
            # TestCase instance interacts with the results object, so better to only do it
            # when absolutely needed.
            # We need to consider if the test itself is skipped, or the whole class.
            assert isinstance(self.parent, UnitTestCase)
            skipped = _is_skipped(self.obj) or _is_skipped(self.parent.obj)
            if self.config.getoption("usepdb") and not skipped:
                self._explicit_tearDown = self._testcase.tearDown
                setattr(self._testcase, "tearDown", lambda *args: None)

# We need to update the actual bound method with self.obj, because
            # wrap_pytest_function_for_tracing replaces self.obj by a wrapper.
            setattr(self._testcase, self.name, self.obj)
            try:
                self._testcase(result=self)  # type: ignore[arg-type]
            finally:
                delattr(self._testcase, self.name)

def _traceback_filter(
        self, excinfo: _pytest._code.ExceptionInfo[BaseException]
    ) -> _pytest._code.Traceback:
        traceback = super()._traceback_filter(excinfo)
        ntraceback = traceback.filter(
            lambda x: not x.frame.f_globals.get("__unittest"),
        )
        if not ntraceback:
            ntraceback = traceback
        return ntraceback

@hookimpl(tryfirst=True)
def pytest_runtest_makereport(item: Item, call: CallInfo[None]) -> None:
    if isinstance(item, TestCaseFunction):
        if item._excinfo:
            call.excinfo = item._excinfo.pop(0)
            try:
                del call.result
            except AttributeError:
                pass

# Convert unittest.SkipTest to pytest.skip.
    # This is actually only needed for nose, which reuses unittest.SkipTest for
    # its own nose.SkipTest. For unittest TestCases, SkipTest is already
    # handled internally, and doesn't reach here.
    unittest = sys.modules.get("unittest")
    if (
        unittest
        and call.excinfo
        and isinstance(call.excinfo.value, unittest.SkipTest)  # type: ignore[attr-defined]
    ):
        excinfo = call.excinfo
        call2 = CallInfo[None].from_call(
            lambda: pytest.skip(str(excinfo.value)), call.when
        )
        call.excinfo = call2.excinfo

# Twisted trial support.

@hookimpl(hookwrapper=True)
def pytest_runtest_protocol(item: Item) -> Generator[None, None, None]:
    if isinstance(item, TestCaseFunction) and "twisted.trial.unittest" in sys.modules:
        ut: Any = sys.modules["twisted.python.failure"]
        Failure__init__ = ut.Failure.__init__
        check_testcase_implements_trial_reporter()

def excstore(
            self, exc_value=None, exc_type=None, exc_tb=None, captureVars=None
        ):
            if exc_value is None:
                self._rawexcinfo = sys.exc_info()
            else:
                if exc_type is None:
                    exc_type = type(exc_value)
                self._rawexcinfo = (exc_type, exc_value, exc_tb)
            try:
                Failure__init__(
                    self, exc_value, exc_type, exc_tb, captureVars=captureVars
                )
            except TypeError:
                Failure__init__(self, exc_value, exc_type, exc_tb)

ut.Failure.__init__ = excstore
        yield
        ut.Failure.__init__ = Failure__init__
    else:
        yield

def check_testcase_implements_trial_reporter(done: List[int] = []) -> None:
    if done:
        return
    from zope.interface import classImplements
    from twisted.trial.itrial import IReporter

classImplements(TestCaseFunction, IReporter)
    done.append(1)

def _is_skipped(obj) -> bool:
    """Return True if the given object has been marked with @unittest.skip."""
    return bool(getattr(obj, "__unittest_skip__", False))

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