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# Copyright (c) Twisted Matrix Laboratories. # See LICENSE for details. """ Tests for Trial's interaction with the Python warning system. """ from __future__ import annotations import sys import warnings from io import StringIO from typing import Mapping, Sequence, TypeVar from unittest import TestResult from twisted.python.filepath import FilePath from twisted.trial._synctest import ( _collectWarnings, _setWarningRegistryToNone, _Warning, ) from twisted.trial.unittest import SynchronousTestCase class Mask: """ Hide a test case definition from trial's automatic discovery mechanism. """ class MockTests(SynchronousTestCase): """ A test case which is used by L{FlushWarningsTests} to verify behavior which cannot be verified by code inside a single test method. """ message = "some warning text" category: type[Warning] = UserWarning def test_unflushed(self) -> None: """ Generate a warning and don't flush it. """ warnings.warn(self.message, self.category) def test_flushed(self) -> None: """ Generate a warning and flush it. """ warnings.warn(self.message, self.category) self.assertEqual(len(self.flushWarnings()), 1) _K = TypeVar("_K") _V = TypeVar("_V") class FlushWarningsTests(SynchronousTestCase): """ Tests for C{flushWarnings}, an API for examining the warnings emitted so far in a test. """ def assertDictSubset(self, set: Mapping[_K, _V], subset: Mapping[_K, _V]) -> None: """ Assert that all the keys present in C{subset} are also present in C{set} and that the corresponding values are equal. """ for k, v in subset.items(): self.assertEqual(set[k], v) def assertDictSubsets( self, sets: Sequence[Mapping[_K, _V]], subsets: Sequence[Mapping[_K, _V]] ) -> None: """ For each pair of corresponding elements in C{sets} and C{subsets}, assert that the element from C{subsets} is a subset of the element from C{sets}. """ self.assertEqual(len(sets), len(subsets)) for a, b in zip(sets, subsets): self.assertDictSubset(a, b) def test_none(self) -> None: """ If no warnings are emitted by a test, C{flushWarnings} returns an empty list. """ self.assertEqual(self.flushWarnings(), []) def test_several(self) -> None: """ If several warnings are emitted by a test, C{flushWarnings} returns a list containing all of them. """ firstMessage = "first warning message" firstCategory = UserWarning warnings.warn(message=firstMessage, category=firstCategory) secondMessage = "second warning message" secondCategory = RuntimeWarning warnings.warn(message=secondMessage, category=secondCategory) self.assertDictSubsets( self.flushWarnings(), [ {"category": firstCategory, "message": firstMessage}, {"category": secondCategory, "message": secondMessage}, ], ) def test_repeated(self) -> None: """ The same warning triggered twice from the same place is included twice in the list returned by C{flushWarnings}. """ message = "the message" category = RuntimeWarning for i in range(2): warnings.warn(message=message, category=category) self.assertDictSubsets( self.flushWarnings(), [{"category": category, "message": message}] * 2 ) def test_cleared(self) -> None: """ After a particular warning event has been returned by C{flushWarnings}, it is not returned by subsequent calls. """ message = "the message" category = RuntimeWarning warnings.warn(message=message, category=category) self.assertDictSubsets( self.flushWarnings(), [{"category": category, "message": message}] ) self.assertEqual(self.flushWarnings(), []) def test_unflushed(self) -> None: """ Any warnings emitted by a test which are not flushed are emitted to the Python warning system. """ result = TestResult() case = Mask.MockTests("test_unflushed") case.run(result) warningsShown = self.flushWarnings([Mask.MockTests.test_unflushed]) self.assertEqual(warningsShown[0]["message"], "some warning text") self.assertIdentical(warningsShown[0]["category"], UserWarning) where = type(case).test_unflushed.__code__ filename = where.co_filename # If someone edits MockTests.test_unflushed, the value added to # firstlineno might need to change. lineno = where.co_firstlineno + 4 self.assertEqual(warningsShown[0]["filename"], filename) self.assertEqual(warningsShown[0]["lineno"], lineno) self.assertEqual(len(warningsShown), 1) def test_flushed(self) -> None: """ Any warnings emitted by a test which are flushed are not emitted to the Python warning system. """ result = TestResult() case = Mask.MockTests("test_flushed") output = StringIO() monkey = self.patch(sys, "stdout", output) case.run(result) monkey.restore() self.assertEqual(output.getvalue(), "") def test_warningsConfiguredAsErrors(self) -> None: """ If a warnings filter has been installed which turns warnings into exceptions, tests have an error added to the reporter for them for each unflushed warning. """ class CustomWarning(Warning): pass result = TestResult() case = Mask.MockTests("test_unflushed") case.category = CustomWarning originalWarnings = warnings.filters[:] try: warnings.simplefilter("error") case.run(result) self.assertEqual(len(result.errors), 1) self.assertIdentical(result.errors[0][0], case) self.assertTrue( # Different python versions differ in whether they report the # fully qualified class name or just the class name. result.errors[0][1] .splitlines()[-1] .endswith("CustomWarning: some warning text") ) finally: warnings.filters[:] = originalWarnings # type: ignore[index] def test_flushedWarningsConfiguredAsErrors(self) -> None: """ If a warnings filter has been installed which turns warnings into exceptions, tests which emit those warnings but flush them do not have an error added to the reporter. """ class CustomWarning(Warning): pass result = TestResult() case = Mask.MockTests("test_flushed") case.category = CustomWarning originalWarnings = warnings.filters[:] try: warnings.simplefilter("error") case.run(result) self.assertEqual(result.errors, []) finally: warnings.filters[:] = originalWarnings # type: ignore[index] def test_multipleFlushes(self) -> None: """ Any warnings emitted after a call to C{flushWarnings} can be flushed by another call to C{flushWarnings}. """ warnings.warn("first message") self.assertEqual(len(self.flushWarnings()), 1) warnings.warn("second message") self.assertEqual(len(self.flushWarnings()), 1) def test_filterOnOffendingFunction(self) -> None: """ The list returned by C{flushWarnings} includes only those warnings which refer to the source of the function passed as the value for C{offendingFunction}, if a value is passed for that parameter. """ firstMessage = "first warning text" firstCategory = UserWarning def one() -> None: warnings.warn(firstMessage, firstCategory, stacklevel=1) secondMessage = "some text" secondCategory = RuntimeWarning def two() -> None: warnings.warn(secondMessage, secondCategory, stacklevel=1) one() two() self.assertDictSubsets( self.flushWarnings(offendingFunctions=[one]), [{"category": firstCategory, "message": firstMessage}], ) self.assertDictSubsets( self.flushWarnings(offendingFunctions=[two]), [{"category": secondCategory, "message": secondMessage}], ) def test_functionBoundaries(self) -> None: """ Verify that warnings emitted at the very edges of a function are still determined to be emitted from that function. """ def warner() -> None: warnings.warn("first line warning") warnings.warn("internal line warning") warnings.warn("last line warning") warner() self.assertEqual(len(self.flushWarnings(offendingFunctions=[warner])), 3) def test_invalidFilter(self) -> None: """ If an object which is neither a function nor a method is included in the C{offendingFunctions} list, C{flushWarnings} raises L{ValueError}. Such a call flushes no warnings. """ warnings.warn("oh no") self.assertRaises(ValueError, self.flushWarnings, [None]) self.assertEqual(len(self.flushWarnings()), 1) def test_missingSource(self) -> None: """ Warnings emitted by a function the source code of which is not available can still be flushed. """ package = FilePath(self.mktemp().encode("utf-8")).child( b"twisted_private_helper" ) package.makedirs() package.child(b"__init__.py").setContent(b"") package.child(b"missingsourcefile.py").setContent( b""" import warnings def foo(): warnings.warn("oh no") """ ) pathEntry = package.parent().path.decode("utf-8") sys.path.insert(0, pathEntry) self.addCleanup(sys.path.remove, pathEntry) # since import is a synthetic thing that we made up just for this test, # it's a local type ignore rather than being present in the mypy config # file like everything else from twisted_private_helper import ( # type: ignore[import-not-found] missingsourcefile, ) self.addCleanup(sys.modules.pop, "twisted_private_helper") self.addCleanup(sys.modules.pop, missingsourcefile.__name__) package.child(b"missingsourcefile.py").remove() missingsourcefile.foo() self.assertEqual(len(self.flushWarnings([missingsourcefile.foo])), 1) def test_renamedSource(self) -> None: """ Warnings emitted by a function defined in a file which has been renamed since it was initially compiled can still be flushed. This is testing the code which specifically supports working around the unfortunate behavior of CPython to write a .py source file name into the .pyc files it generates and then trust that it is correct in various places. If source files are renamed, .pyc files may not be regenerated, but they will contain incorrect filenames. """ package = FilePath(self.mktemp().encode("utf-8")).child( b"twisted_private_helper" ) package.makedirs() package.child(b"__init__.py").setContent(b"") package.child(b"module.py").setContent( b""" import warnings def foo(): warnings.warn("oh no") """ ) pathEntry = package.parent().path.decode("utf-8") sys.path.insert(0, pathEntry) self.addCleanup(sys.path.remove, pathEntry) # Import it to cause pycs to be generated from twisted_private_helper import module # Clean up the state resulting from that import; we're not going to use # this module, so it should go away. del sys.modules["twisted_private_helper"] del sys.modules[module.__name__] # Some Python versions have extra state related to the just # imported/renamed package. Clean it up too. See also # http://bugs.python.org/issue15912 try: from importlib import invalidate_caches except ImportError: pass else: invalidate_caches() # Rename the source directory package.moveTo(package.sibling(b"twisted_renamed_helper")) # Import the newly renamed version from twisted_renamed_helper import module # type: ignore[import-not-found] self.addCleanup(sys.modules.pop, "twisted_renamed_helper") self.addCleanup(sys.modules.pop, module.__name__) # Generate the warning module.foo() # Flush it self.assertEqual(len(self.flushWarnings([module.foo])), 1) def test_offendingFunctions_deep_branch(self) -> None: """ In Python 3.6 the dis.findlinestarts documented behaviour was changed such that the reported lines might not be sorted ascending. In Python 3.10 PEP 626 introduced byte-code change such that the last line of a function wasn't always associated with the last byte-code. In the past flushWarning was not detecting that such a function was associated with any warnings. """ def foo(a: int = 1, b: int = 1) -> None: if a: if b: warnings.warn("oh no") else: pass # Generate the warning foo() # Flush it self.assertEqual(len(self.flushWarnings([foo])), 1) class FakeWarning(Warning): pass class CollectWarningsTests(SynchronousTestCase): """ Tests for L{_collectWarnings}. """ def test_callsObserver(self) -> None: """ L{_collectWarnings} calls the observer with each emitted warning. """ firstMessage = "dummy calls observer warning" secondMessage = firstMessage[::-1] thirdMessage = Warning(1, 2, 3) events: list[str | _Warning] = [] def f() -> None: events.append("call") warnings.warn(firstMessage) warnings.warn(secondMessage) warnings.warn(thirdMessage) events.append("returning") _collectWarnings(events.append, f) self.assertEqual(events[0], "call") assert isinstance(events[1], _Warning) self.assertEqual(events[1].message, firstMessage) assert isinstance(events[2], _Warning) self.assertEqual(events[2].message, secondMessage) assert isinstance(events[3], _Warning) self.assertEqual(events[3].message, str(thirdMessage)) self.assertEqual(events[4], "returning") self.assertEqual(len(events), 5) def test_suppresses(self) -> None: """ Any warnings emitted by a call to a function passed to L{_collectWarnings} are not actually emitted to the warning system. """ output = StringIO() self.patch(sys, "stdout", output) _collectWarnings(lambda x: None, warnings.warn, "text") self.assertEqual(output.getvalue(), "") def test_callsFunction(self) -> None: """ L{_collectWarnings} returns the result of calling the callable passed to it with the parameters given. """ arguments = [] value = object() def f(*args: object, **kwargs: object) -> object: arguments.append((args, kwargs)) return value result = _collectWarnings(lambda x: None, f, 1, "a", b=2, c="d") self.assertEqual(arguments, [((1, "a"), {"b": 2, "c": "d"})]) self.assertIdentical(result, value) def test_duplicateWarningCollected(self) -> None: """ Subsequent emissions of a warning from a particular source site can be collected by L{_collectWarnings}. In particular, the per-module emitted-warning cache should be bypassed (I{__warningregistry__}). """ # Make sure the worst case is tested: if __warningregistry__ isn't in a # module's globals, then the warning system will add it and start using # it to avoid emitting duplicate warnings. Delete __warningregistry__ # to ensure that even modules which are first imported as a test is # running still interact properly with the warning system. global __warningregistry__ del __warningregistry__ # type: ignore[name-defined] def f() -> None: warnings.warn("foo") warnings.simplefilter("default") f() events: list[_Warning] = [] _collectWarnings(events.append, f) self.assertEqual(len(events), 1) self.assertEqual(events[0].message, "foo") self.assertEqual(len(self.flushWarnings()), 1) def test_immutableObject(self) -> None: """ L{_collectWarnings}'s behavior is not altered by the presence of an object which cannot have attributes set on it as a value in C{sys.modules}. """ key = object() sys.modules[key] = key # type: ignore[index, assignment] self.addCleanup(sys.modules.pop, key) # type: ignore[arg-type] self.test_duplicateWarningCollected() def test_setWarningRegistryChangeWhileIterating(self) -> None: """ If the dictionary passed to L{_setWarningRegistryToNone} changes size partway through the process, C{_setWarningRegistryToNone} continues to set C{__warningregistry__} to L{None} on the rest of the values anyway. This might be caused by C{sys.modules} containing something that's not really a module and imports things on setattr. py.test does this, as does L{twisted.python.deprecate.deprecatedModuleAttribute}. """ d: dict[object, A | None] = {} class A: def __init__(self, key: object) -> None: self.__dict__["_key"] = key def __setattr__(self, value: object, item: object) -> None: d[self._key] = None # type: ignore[attr-defined] key1 = object() key2 = object() d[key1] = A(key2) key3 = object() key4 = object() d[key3] = A(key4) _setWarningRegistryToNone(d) # If both key2 and key4 were added, then both A instanced were # processed. self.assertEqual({key1, key2, key3, key4}, set(d.keys()))