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unittest.py
"""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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