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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))