421 lines
14 KiB
Python
421 lines
14 KiB
Python
"""Discover and run std-library "unittest" style tests."""
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import sys
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import traceback
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import types
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from typing import Any
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from typing import Callable
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from typing import Generator
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from typing import Iterable
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from typing import List
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from typing import Optional
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from typing import Tuple
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from typing import Type
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from typing import TYPE_CHECKING
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from typing import Union
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import _pytest._code
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import pytest
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from _pytest.compat import getimfunc
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from _pytest.compat import is_async_function
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from _pytest.config import hookimpl
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from _pytest.fixtures import FixtureRequest
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from _pytest.nodes import Collector
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from _pytest.nodes import Item
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from _pytest.outcomes import exit
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from _pytest.outcomes import fail
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from _pytest.outcomes import skip
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from _pytest.outcomes import xfail
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from _pytest.python import Class
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from _pytest.python import Function
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from _pytest.python import Module
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from _pytest.runner import CallInfo
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from _pytest.scope import Scope
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if TYPE_CHECKING:
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import unittest
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import twisted.trial.unittest
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_SysExcInfoType = Union[
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Tuple[Type[BaseException], BaseException, types.TracebackType],
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Tuple[None, None, None],
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]
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def pytest_pycollect_makeitem(
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collector: Union[Module, Class], name: str, obj: object
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) -> Optional["UnitTestCase"]:
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# Has unittest been imported and is obj a subclass of its TestCase?
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try:
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ut = sys.modules["unittest"]
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# Type ignored because `ut` is an opaque module.
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if not issubclass(obj, ut.TestCase): # type: ignore
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return None
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except Exception:
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return None
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# Yes, so let's collect it.
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item: UnitTestCase = UnitTestCase.from_parent(collector, name=name, obj=obj)
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return item
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class UnitTestCase(Class):
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# Marker for fixturemanger.getfixtureinfo()
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# to declare that our children do not support funcargs.
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nofuncargs = True
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def collect(self) -> Iterable[Union[Item, Collector]]:
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from unittest import TestLoader
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cls = self.obj
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if not getattr(cls, "__test__", True):
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return
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skipped = _is_skipped(cls)
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if not skipped:
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self._inject_setup_teardown_fixtures(cls)
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self._inject_setup_class_fixture()
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self.session._fixturemanager.parsefactories(self, unittest=True)
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loader = TestLoader()
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foundsomething = False
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for name in loader.getTestCaseNames(self.obj):
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x = getattr(self.obj, name)
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if not getattr(x, "__test__", True):
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continue
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funcobj = getimfunc(x)
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yield TestCaseFunction.from_parent(self, name=name, callobj=funcobj)
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foundsomething = True
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if not foundsomething:
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runtest = getattr(self.obj, "runTest", None)
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if runtest is not None:
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ut = sys.modules.get("twisted.trial.unittest", None)
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# Type ignored because `ut` is an opaque module.
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if ut is None or runtest != ut.TestCase.runTest: # type: ignore
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yield TestCaseFunction.from_parent(self, name="runTest")
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def _inject_setup_teardown_fixtures(self, cls: type) -> None:
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"""Injects a hidden auto-use fixture to invoke setUpClass/setup_method and corresponding
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teardown functions (#517)."""
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class_fixture = _make_xunit_fixture(
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cls,
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"setUpClass",
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"tearDownClass",
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"doClassCleanups",
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scope=Scope.Class,
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pass_self=False,
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)
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if class_fixture:
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cls.__pytest_class_setup = class_fixture # type: ignore[attr-defined]
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method_fixture = _make_xunit_fixture(
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cls,
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"setup_method",
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"teardown_method",
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None,
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scope=Scope.Function,
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pass_self=True,
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)
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if method_fixture:
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cls.__pytest_method_setup = method_fixture # type: ignore[attr-defined]
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def _make_xunit_fixture(
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obj: type,
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setup_name: str,
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teardown_name: str,
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cleanup_name: Optional[str],
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scope: Scope,
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pass_self: bool,
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):
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setup = getattr(obj, setup_name, None)
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teardown = getattr(obj, teardown_name, None)
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if setup is None and teardown is None:
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return None
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if cleanup_name:
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cleanup = getattr(obj, cleanup_name, lambda *args: None)
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else:
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def cleanup(*args):
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pass
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@pytest.fixture(
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scope=scope.value,
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autouse=True,
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# Use a unique name to speed up lookup.
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name=f"_unittest_{setup_name}_fixture_{obj.__qualname__}",
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)
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def fixture(self, request: FixtureRequest) -> Generator[None, None, None]:
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if _is_skipped(self):
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reason = self.__unittest_skip_why__
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raise pytest.skip.Exception(reason, _use_item_location=True)
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if setup is not None:
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try:
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if pass_self:
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setup(self, request.function)
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else:
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setup()
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# unittest does not call the cleanup function for every BaseException, so we
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# follow this here.
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except Exception:
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if pass_self:
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cleanup(self)
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else:
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cleanup()
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raise
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yield
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try:
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if teardown is not None:
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if pass_self:
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teardown(self, request.function)
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else:
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teardown()
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finally:
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if pass_self:
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cleanup(self)
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else:
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cleanup()
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return fixture
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class TestCaseFunction(Function):
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nofuncargs = True
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_excinfo: Optional[List[_pytest._code.ExceptionInfo[BaseException]]] = None
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_testcase: Optional["unittest.TestCase"] = None
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def _getobj(self):
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assert self.parent is not None
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# Unlike a regular Function in a Class, where `item.obj` returns
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# a *bound* method (attached to an instance), TestCaseFunction's
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# `obj` returns an *unbound* method (not attached to an instance).
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# This inconsistency is probably not desirable, but needs some
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# consideration before changing.
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return getattr(self.parent.obj, self.originalname) # type: ignore[attr-defined]
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def setup(self) -> None:
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# A bound method to be called during teardown() if set (see 'runtest()').
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self._explicit_tearDown: Optional[Callable[[], None]] = None
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assert self.parent is not None
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self._testcase = self.parent.obj(self.name) # type: ignore[attr-defined]
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self._obj = getattr(self._testcase, self.name)
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if hasattr(self, "_request"):
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self._request._fillfixtures()
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def teardown(self) -> None:
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if self._explicit_tearDown is not None:
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self._explicit_tearDown()
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self._explicit_tearDown = None
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self._testcase = None
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self._obj = None
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def startTest(self, testcase: "unittest.TestCase") -> None:
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pass
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def _addexcinfo(self, rawexcinfo: "_SysExcInfoType") -> None:
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# Unwrap potential exception info (see twisted trial support below).
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rawexcinfo = getattr(rawexcinfo, "_rawexcinfo", rawexcinfo)
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try:
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excinfo = _pytest._code.ExceptionInfo[BaseException].from_exc_info(rawexcinfo) # type: ignore[arg-type]
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# Invoke the attributes to trigger storing the traceback
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# trial causes some issue there.
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excinfo.value
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excinfo.traceback
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except TypeError:
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try:
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try:
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values = traceback.format_exception(*rawexcinfo)
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values.insert(
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0,
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"NOTE: Incompatible Exception Representation, "
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"displaying natively:\n\n",
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)
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fail("".join(values), pytrace=False)
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except (fail.Exception, KeyboardInterrupt):
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raise
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except BaseException:
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fail(
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"ERROR: Unknown Incompatible Exception "
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"representation:\n%r" % (rawexcinfo,),
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pytrace=False,
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)
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except KeyboardInterrupt:
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raise
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except fail.Exception:
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excinfo = _pytest._code.ExceptionInfo.from_current()
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self.__dict__.setdefault("_excinfo", []).append(excinfo)
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def addError(
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self, testcase: "unittest.TestCase", rawexcinfo: "_SysExcInfoType"
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) -> None:
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try:
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if isinstance(rawexcinfo[1], exit.Exception):
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exit(rawexcinfo[1].msg)
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except TypeError:
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pass
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self._addexcinfo(rawexcinfo)
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def addFailure(
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self, testcase: "unittest.TestCase", rawexcinfo: "_SysExcInfoType"
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) -> None:
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self._addexcinfo(rawexcinfo)
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def addSkip(self, testcase: "unittest.TestCase", reason: str) -> None:
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try:
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raise pytest.skip.Exception(reason, _use_item_location=True)
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except skip.Exception:
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self._addexcinfo(sys.exc_info())
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def addExpectedFailure(
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self,
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testcase: "unittest.TestCase",
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rawexcinfo: "_SysExcInfoType",
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reason: str = "",
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) -> None:
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try:
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xfail(str(reason))
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except xfail.Exception:
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self._addexcinfo(sys.exc_info())
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def addUnexpectedSuccess(
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self,
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testcase: "unittest.TestCase",
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reason: Optional["twisted.trial.unittest.Todo"] = None,
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) -> None:
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msg = "Unexpected success"
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if reason:
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msg += f": {reason.reason}"
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# Preserve unittest behaviour - fail the test. Explicitly not an XPASS.
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try:
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fail(msg, pytrace=False)
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except fail.Exception:
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self._addexcinfo(sys.exc_info())
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def addSuccess(self, testcase: "unittest.TestCase") -> None:
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pass
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def stopTest(self, testcase: "unittest.TestCase") -> None:
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pass
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def addDuration(self, testcase: "unittest.TestCase", elapsed: float) -> None:
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pass
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def runtest(self) -> None:
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from _pytest.debugging import maybe_wrap_pytest_function_for_tracing
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assert self._testcase is not None
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maybe_wrap_pytest_function_for_tracing(self)
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# Let the unittest framework handle async functions.
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if is_async_function(self.obj):
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# Type ignored because self acts as the TestResult, but is not actually one.
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self._testcase(result=self) # type: ignore[arg-type]
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else:
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# When --pdb is given, we want to postpone calling tearDown() otherwise
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# when entering the pdb prompt, tearDown() would have probably cleaned up
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# instance variables, which makes it difficult to debug.
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# Arguably we could always postpone tearDown(), but this changes the moment where the
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# TestCase instance interacts with the results object, so better to only do it
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# when absolutely needed.
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# We need to consider if the test itself is skipped, or the whole class.
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assert isinstance(self.parent, UnitTestCase)
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skipped = _is_skipped(self.obj) or _is_skipped(self.parent.obj)
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if self.config.getoption("usepdb") and not skipped:
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self._explicit_tearDown = self._testcase.tearDown
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setattr(self._testcase, "tearDown", lambda *args: None)
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# We need to update the actual bound method with self.obj, because
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# wrap_pytest_function_for_tracing replaces self.obj by a wrapper.
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setattr(self._testcase, self.name, self.obj)
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try:
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self._testcase(result=self) # type: ignore[arg-type]
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finally:
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delattr(self._testcase, self.name)
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def _traceback_filter(
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self, excinfo: _pytest._code.ExceptionInfo[BaseException]
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) -> _pytest._code.Traceback:
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traceback = super()._traceback_filter(excinfo)
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ntraceback = traceback.filter(
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lambda x: not x.frame.f_globals.get("__unittest"),
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)
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if not ntraceback:
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ntraceback = traceback
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return ntraceback
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@hookimpl(tryfirst=True)
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def pytest_runtest_makereport(item: Item, call: CallInfo[None]) -> None:
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if isinstance(item, TestCaseFunction):
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if item._excinfo:
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call.excinfo = item._excinfo.pop(0)
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try:
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del call.result
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except AttributeError:
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pass
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# Convert unittest.SkipTest to pytest.skip.
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# This is actually only needed for nose, which reuses unittest.SkipTest for
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# its own nose.SkipTest. For unittest TestCases, SkipTest is already
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# handled internally, and doesn't reach here.
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unittest = sys.modules.get("unittest")
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if (
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unittest
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and call.excinfo
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and isinstance(call.excinfo.value, unittest.SkipTest) # type: ignore[attr-defined]
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):
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excinfo = call.excinfo
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call2 = CallInfo[None].from_call(
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lambda: pytest.skip(str(excinfo.value)), call.when
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)
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call.excinfo = call2.excinfo
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# Twisted trial support.
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@hookimpl(hookwrapper=True)
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def pytest_runtest_protocol(item: Item) -> Generator[None, None, None]:
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if isinstance(item, TestCaseFunction) and "twisted.trial.unittest" in sys.modules:
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ut: Any = sys.modules["twisted.python.failure"]
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Failure__init__ = ut.Failure.__init__
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check_testcase_implements_trial_reporter()
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def excstore(
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self, exc_value=None, exc_type=None, exc_tb=None, captureVars=None
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):
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if exc_value is None:
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self._rawexcinfo = sys.exc_info()
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else:
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if exc_type is None:
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exc_type = type(exc_value)
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self._rawexcinfo = (exc_type, exc_value, exc_tb)
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try:
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Failure__init__(
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self, exc_value, exc_type, exc_tb, captureVars=captureVars
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)
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except TypeError:
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Failure__init__(self, exc_value, exc_type, exc_tb)
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ut.Failure.__init__ = excstore
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yield
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ut.Failure.__init__ = Failure__init__
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else:
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yield
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def check_testcase_implements_trial_reporter(done: List[int] = []) -> None:
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if done:
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return
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from zope.interface import classImplements
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from twisted.trial.itrial import IReporter
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classImplements(TestCaseFunction, IReporter)
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done.append(1)
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def _is_skipped(obj) -> bool:
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"""Return True if the given object has been marked with @unittest.skip."""
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return bool(getattr(obj, "__unittest_skip__", False))
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