__init__.py

from contextlib import contextmanager
import linecache
import os
import importlib
import inspect
from io import StringIO
import re
import sys
import textwrap
import types
from typing import overload, get_overloads
import unittest
from test import support
from test.support import import_helper
from test.support import os_helper
from test.support import warnings_helper
from test.support import force_not_colorized
from test.support.script_helper import assert_python_ok, assert_python_failure

from test.test_warnings.data import package_helper
from test.test_warnings.data import stacklevel as warning_tests

import warnings as original_warnings
from warnings import deprecated


py_warnings = import_helper.import_fresh_module('warnings',
                                                blocked=['_warnings'])
c_warnings = import_helper.import_fresh_module('warnings',
                                               fresh=['_warnings'])

@contextmanager
def warnings_state(module):
    """Use a specific warnings implementation in warning_tests."""
    global __warningregistry__
    for to_clear in (sys, warning_tests):
        try:
            to_clear.__warningregistry__.clear()
        except AttributeError:
            pass
    try:
        __warningregistry__.clear()
    except NameError:
        pass
    original_warnings = warning_tests.warnings
    original_filters = module.filters
    try:
        module.filters = original_filters[:]
        module.simplefilter("once")
        warning_tests.warnings = module
        yield
    finally:
        warning_tests.warnings = original_warnings
        module.filters = original_filters


class TestWarning(Warning):
    pass


class BaseTest:

    """Basic bookkeeping required for testing."""

    def setUp(self):
        self.old_unittest_module = unittest.case.warnings
        # The __warningregistry__ needs to be in a pristine state for tests
        # to work properly.
        if '__warningregistry__' in globals():
            del globals()['__warningregistry__']
        if hasattr(warning_tests, '__warningregistry__'):
            del warning_tests.__warningregistry__
        if hasattr(sys, '__warningregistry__'):
            del sys.__warningregistry__
        # The 'warnings' module must be explicitly set so that the proper
        # interaction between _warnings and 'warnings' can be controlled.
        sys.modules['warnings'] = self.module
        # Ensure that unittest.TestCase.assertWarns() uses the same warnings
        # module than warnings.catch_warnings(). Otherwise,
        # warnings.catch_warnings() will be unable to remove the added filter.
        unittest.case.warnings = self.module
        super(BaseTest, self).setUp()

    def tearDown(self):
        sys.modules['warnings'] = original_warnings
        unittest.case.warnings = self.old_unittest_module
        super(BaseTest, self).tearDown()

class PublicAPITests(BaseTest):

    """Ensures that the correct values are exposed in the
    public API.
    """

    def test_module_all_attribute(self):
        self.assertTrue(hasattr(self.module, '__all__'))
        target_api = ["warn", "warn_explicit", "showwarning",
                      "formatwarning", "filterwarnings", "simplefilter",
                      "resetwarnings", "catch_warnings", "deprecated"]
        self.assertSetEqual(set(self.module.__all__),
                            set(target_api))

class CPublicAPITests(PublicAPITests, unittest.TestCase):
    module = c_warnings

class PyPublicAPITests(PublicAPITests, unittest.TestCase):
    module = py_warnings

class FilterTests(BaseTest):

    """Testing the filtering functionality."""

    def test_error(self):
        with original_warnings.catch_warnings(module=self.module) as w:
            self.module.resetwarnings()
            self.module.filterwarnings("error", category=UserWarning)
            self.assertRaises(UserWarning, self.module.warn,
                                "FilterTests.test_error")

    def test_error_after_default(self):
        with original_warnings.catch_warnings(module=self.module) as w:
            self.module.resetwarnings()
            message = "FilterTests.test_ignore_after_default"
            def f():
                self.module.warn(message, UserWarning)

            with support.captured_stderr() as stderr:
                f()
            stderr = stderr.getvalue()
            self.assertIn("UserWarning: FilterTests.test_ignore_after_default",
                          stderr)
            self.assertIn("self.module.warn(message, UserWarning)",
                          stderr)

            self.module.filterwarnings("error", category=UserWarning)
            self.assertRaises(UserWarning, f)

    def test_ignore(self):
        with original_warnings.catch_warnings(record=True,
                module=self.module) as w:
            self.module.resetwarnings()
            self.module.filterwarnings("ignore", category=UserWarning)
            self.module.warn("FilterTests.test_ignore", UserWarning)
            self.assertEqual(len(w), 0)
            self.assertEqual(list(__warningregistry__), ['version'])

    def test_ignore_after_default(self):
        with original_warnings.catch_warnings(record=True,
                module=self.module) as w:
            self.module.resetwarnings()
            message = "FilterTests.test_ignore_after_default"
            def f():
                self.module.warn(message, UserWarning)
            f()
            self.module.filterwarnings("ignore", category=UserWarning)
            f()
            f()
            self.assertEqual(len(w), 1)

    def test_always(self):
        with original_warnings.catch_warnings(record=True,
                module=self.module) as w:
            self.module.resetwarnings()
            self.module.filterwarnings("always", category=UserWarning)
            message = "FilterTests.test_always"
            def f():
                self.module.warn(message, UserWarning)
            f()
            self.assertEqual(len(w), 1)
            self.assertEqual(w[-1].message.args[0], message)
            f()
            self.assertEqual(len(w), 2)
            self.assertEqual(w[-1].message.args[0], message)

    def test_always_after_default(self):
        with original_warnings.catch_warnings(record=True,
                module=self.module) as w:
            self.module.resetwarnings()
            message = "FilterTests.test_always_after_ignore"
            def f():
                self.module.warn(message, UserWarning)
            f()
            self.assertEqual(len(w), 1)
            self.assertEqual(w[-1].message.args[0], message)
            f()
            self.assertEqual(len(w), 1)
            self.module.filterwarnings("always", category=UserWarning)
            f()
            self.assertEqual(len(w), 2)
            self.assertEqual(w[-1].message.args[0], message)
            f()
            self.assertEqual(len(w), 3)
            self.assertEqual(w[-1].message.args[0], message)

    def test_default(self):
        with original_warnings.catch_warnings(record=True,
                module=self.module) as w:
            self.module.resetwarnings()
            self.module.filterwarnings("default", category=UserWarning)
            message = UserWarning("FilterTests.test_default")
            for x in range(2):
                self.module.warn(message, UserWarning)
                if x == 0:
                    self.assertEqual(w[-1].message, message)
                    del w[:]
                elif x == 1:
                    self.assertEqual(len(w), 0)
                else:
                    raise ValueError("loop variant unhandled")

    def test_module(self):
        with original_warnings.catch_warnings(record=True,
                module=self.module) as w:
            self.module.resetwarnings()
            self.module.filterwarnings("module", category=UserWarning)
            message = UserWarning("FilterTests.test_module")
            self.module.warn(message, UserWarning)
            self.assertEqual(w[-1].message, message)
            del w[:]
            self.module.warn(message, UserWarning)
            self.assertEqual(len(w), 0)

    def test_once(self):
        with original_warnings.catch_warnings(record=True,
                module=self.module) as w:
            self.module.resetwarnings()
            self.module.filterwarnings("once", category=UserWarning)
            message = UserWarning("FilterTests.test_once")
            self.module.warn_explicit(message, UserWarning, "__init__.py",
                                    42)
            self.assertEqual(w[-1].message, message)
            del w[:]
            self.module.warn_explicit(message, UserWarning, "__init__.py",
                                    13)
            self.assertEqual(len(w), 0)
            self.module.warn_explicit(message, UserWarning, "test_warnings2.py",
                                    42)
            self.assertEqual(len(w), 0)

    def test_module_globals(self):
        with original_warnings.catch_warnings(record=True,
                module=self.module) as w:
            self.module.simplefilter("always", UserWarning)

            # bpo-33509: module_globals=None must not crash
            self.module.warn_explicit('msg', UserWarning, "filename", 42,
                                      module_globals=None)
            self.assertEqual(len(w), 1)

            # Invalid module_globals type
            with self.assertRaises(TypeError):
                self.module.warn_explicit('msg', UserWarning, "filename", 42,
                                          module_globals=True)
            self.assertEqual(len(w), 1)

            # Empty module_globals
            self.module.warn_explicit('msg', UserWarning, "filename", 42,
                                      module_globals={})
            self.assertEqual(len(w), 2)

    def test_inheritance(self):
        with original_warnings.catch_warnings(module=self.module) as w:
            self.module.resetwarnings()
            self.module.filterwarnings("error", category=Warning)
            self.assertRaises(UserWarning, self.module.warn,
                                "FilterTests.test_inheritance", UserWarning)

    def test_ordering(self):
        with original_warnings.catch_warnings(record=True,
                module=self.module) as w:
            self.module.resetwarnings()
            self.module.filterwarnings("ignore", category=UserWarning)
            self.module.filterwarnings("error", category=UserWarning,
                                        append=True)
            del w[:]
            try:
                self.module.warn("FilterTests.test_ordering", UserWarning)
            except UserWarning:
                self.fail("order handling for actions failed")
            self.assertEqual(len(w), 0)

    def test_filterwarnings(self):
        # Test filterwarnings().
        # Implicitly also tests resetwarnings().
        with original_warnings.catch_warnings(record=True,
                module=self.module) as w:
            self.module.filterwarnings("error", "", Warning, "", 0)
            self.assertRaises(UserWarning, self.module.warn, 'convert to error')

            self.module.resetwarnings()
            text = 'handle normally'
            self.module.warn(text)
            self.assertEqual(str(w[-1].message), text)
            self.assertIs(w[-1].category, UserWarning)

            self.module.filterwarnings("ignore", "", Warning, "", 0)
            text = 'filtered out'
            self.module.warn(text)
            self.assertNotEqual(str(w[-1].message), text)

            self.module.resetwarnings()
            self.module.filterwarnings("error", "hex*", Warning, "", 0)
            self.assertRaises(UserWarning, self.module.warn, 'hex/oct')
            text = 'nonmatching text'
            self.module.warn(text)
            self.assertEqual(str(w[-1].message), text)
            self.assertIs(w[-1].category, UserWarning)

    def test_message_matching(self):
        with original_warnings.catch_warnings(record=True,
                module=self.module) as w:
            self.module.simplefilter("ignore", UserWarning)
            self.module.filterwarnings("error", "match", UserWarning)
            self.assertRaises(UserWarning, self.module.warn, "match")
            self.assertRaises(UserWarning, self.module.warn, "match prefix")
            self.module.warn("suffix match")
            self.assertEqual(w, [])
            self.module.warn("something completely different")
            self.assertEqual(w, [])

    def test_mutate_filter_list(self):
        class X:
            def match(self, a):
                L[:] = []

        L = [("default",X(),UserWarning,X(),0) for i in range(2)]
        with original_warnings.catch_warnings(record=True,
                module=self.module) as w:
            self.module.filters = L
            self.module.warn_explicit(UserWarning("b"), None, "f.py", 42)
            self.assertEqual(str(w[-1].message), "b")

    def test_filterwarnings_duplicate_filters(self):
        with original_warnings.catch_warnings(module=self.module):
            self.module.resetwarnings()
            self.module.filterwarnings("error", category=UserWarning)
            self.assertEqual(len(self.module.filters), 1)
            self.module.filterwarnings("ignore", category=UserWarning)
            self.module.filterwarnings("error", category=UserWarning)
            self.assertEqual(
                len(self.module.filters), 2,
                "filterwarnings inserted duplicate filter"
            )
            self.assertEqual(
                self.module.filters[0][0], "error",
                "filterwarnings did not promote filter to "
                "the beginning of list"
            )

    def test_simplefilter_duplicate_filters(self):
        with original_warnings.catch_warnings(module=self.module):
            self.module.resetwarnings()
            self.module.simplefilter("error", category=UserWarning)
            self.assertEqual(len(self.module.filters), 1)
            self.module.simplefilter("ignore", category=UserWarning)
            self.module.simplefilter("error", category=UserWarning)
            self.assertEqual(
                len(self.module.filters), 2,
                "simplefilter inserted duplicate filter"
            )
            self.assertEqual(
                self.module.filters[0][0], "error",
                "simplefilter did not promote filter to the beginning of list"
            )

    def test_append_duplicate(self):
        with original_warnings.catch_warnings(module=self.module,
                record=True) as w:
            self.module.resetwarnings()
            self.module.simplefilter("ignore")
            self.module.simplefilter("error", append=True)
            self.module.simplefilter("ignore", append=True)
            self.module.warn("test_append_duplicate", category=UserWarning)
            self.assertEqual(len(self.module.filters), 2,
                "simplefilter inserted duplicate filter"
            )
            self.assertEqual(len(w), 0,
                "appended duplicate changed order of filters"
            )

    def test_argument_validation(self):
        with self.assertRaises(ValueError):
            self.module.filterwarnings(action='foo')
        with self.assertRaises(TypeError):
            self.module.filterwarnings('ignore', message=0)
        with self.assertRaises(TypeError):
            self.module.filterwarnings('ignore', category=0)
        with self.assertRaises(TypeError):
            self.module.filterwarnings('ignore', category=int)
        with self.assertRaises(TypeError):
            self.module.filterwarnings('ignore', module=0)
        with self.assertRaises(TypeError):
            self.module.filterwarnings('ignore', lineno=int)
        with self.assertRaises(ValueError):
            self.module.filterwarnings('ignore', lineno=-1)
        with self.assertRaises(ValueError):
            self.module.simplefilter(action='foo')
        with self.assertRaises(TypeError):
            self.module.simplefilter('ignore', lineno=int)
        with self.assertRaises(ValueError):
            self.module.simplefilter('ignore', lineno=-1)

    def test_catchwarnings_with_simplefilter_ignore(self):
        with original_warnings.catch_warnings(module=self.module):
            self.module.resetwarnings()
            self.module.simplefilter("error")
            with self.module.catch_warnings(
                module=self.module, action="ignore"
            ):
                self.module.warn("This will be ignored")

    def test_catchwarnings_with_simplefilter_error(self):
        with original_warnings.catch_warnings(module=self.module):
            self.module.resetwarnings()
            with self.module.catch_warnings(
                module=self.module, action="error", category=FutureWarning
            ):
                with support.captured_stderr() as stderr:
                    error_msg = "Other types of warnings are not errors"
                    self.module.warn(error_msg)
                    self.assertRaises(FutureWarning,
                                      self.module.warn, FutureWarning("msg"))
                    stderr = stderr.getvalue()
                    self.assertIn(error_msg, stderr)

class CFilterTests(FilterTests, unittest.TestCase):
    module = c_warnings

class PyFilterTests(FilterTests, unittest.TestCase):
    module = py_warnings


class WarnTests(BaseTest):

    """Test warnings.warn() and warnings.warn_explicit()."""

    def test_message(self):
        with original_warnings.catch_warnings(record=True,
                module=self.module) as w:
            self.module.simplefilter("once")
            for i in range(4):
                text = 'multi %d' %i  # Different text on each call.
                self.module.warn(text)
                self.assertEqual(str(w[-1].message), text)
                self.assertIs(w[-1].category, UserWarning)

    # Issue 3639
    def test_warn_nonstandard_types(self):
        # warn() should handle non-standard types without issue.
        for ob in (Warning, None, 42):
            with original_warnings.catch_warnings(record=True,
                    module=self.module) as w:
                self.module.simplefilter("once")
                self.module.warn(ob)
                # Don't directly compare objects since
                # ``Warning() != Warning()``.
                self.assertEqual(str(w[-1].message), str(UserWarning(ob)))

    def test_filename(self):
        with warnings_state(self.module):
            with original_warnings.catch_warnings(record=True,
                    module=self.module) as w:
                warning_tests.inner("spam1")
                self.assertEqual(os.path.basename(w[-1].filename),
                                    "stacklevel.py")
                warning_tests.outer("spam2")
                self.assertEqual(os.path.basename(w[-1].filename),
                                    "stacklevel.py")

    def test_stacklevel(self):
        # Test stacklevel argument
        # make sure all messages are different, so the warning won't be skipped
        with warnings_state(self.module):
            with original_warnings.catch_warnings(record=True,
                    module=self.module) as w:
                warning_tests.inner("spam3", stacklevel=1)
                self.assertEqual(os.path.basename(w[-1].filename),
                                    "stacklevel.py")
                warning_tests.outer("spam4", stacklevel=1)
                self.assertEqual(os.path.basename(w[-1].filename),
                                    "stacklevel.py")

                warning_tests.inner("spam5", stacklevel=2)
                self.assertEqual(os.path.basename(w[-1].filename),
                                    "__init__.py")
                warning_tests.outer("spam6", stacklevel=2)
                self.assertEqual(os.path.basename(w[-1].filename),
                                    "stacklevel.py")
                warning_tests.outer("spam6.5", stacklevel=3)
                self.assertEqual(os.path.basename(w[-1].filename),
                                    "__init__.py")

                warning_tests.inner("spam7", stacklevel=9999)
                self.assertEqual(os.path.basename(w[-1].filename),
                                    "<sys>")

    # TODO: RUSTPYTHON
    @unittest.expectedFailure
    def test_stacklevel_import(self):
        # Issue #24305: With stacklevel=2, module-level warnings should work.
        import_helper.unload('test.test_warnings.data.import_warning')
        with warnings_state(self.module):
            with original_warnings.catch_warnings(record=True,
                    module=self.module) as w:
                self.module.simplefilter('always')
                import test.test_warnings.data.import_warning
                self.assertEqual(len(w), 1)
                self.assertEqual(w[0].filename, __file__)

    def test_skip_file_prefixes(self):
        with warnings_state(self.module):
            with original_warnings.catch_warnings(record=True,
                    module=self.module) as w:
                self.module.simplefilter('always')

                # Warning never attributed to the data/ package.
                package_helper.inner_api(
                        "inner_api", stacklevel=2,
                        warnings_module=warning_tests.warnings)
                self.assertEqual(w[-1].filename, __file__)
                warning_tests.package("package api", stacklevel=2)
                self.assertEqual(w[-1].filename, __file__)
                self.assertEqual(w[-2].filename, w[-1].filename)
                # Low stacklevels are overridden to 2 behavior.
                warning_tests.package("package api 1", stacklevel=1)
                self.assertEqual(w[-1].filename, __file__)
                warning_tests.package("package api 0", stacklevel=0)
                self.assertEqual(w[-1].filename, __file__)
                warning_tests.package("package api -99", stacklevel=-99)
                self.assertEqual(w[-1].filename, __file__)

                # The stacklevel still goes up out of the package.
                warning_tests.package("prefix02", stacklevel=3)
                self.assertIn("unittest", w[-1].filename)

    def test_skip_file_prefixes_type_errors(self):
        with warnings_state(self.module):
            warn = warning_tests.warnings.warn
            with self.assertRaises(TypeError):
                warn("msg", skip_file_prefixes=[])
            with self.assertRaises(TypeError):
                warn("msg", skip_file_prefixes=(b"bytes",))
            with self.assertRaises(TypeError):
                warn("msg", skip_file_prefixes="a sequence of strs")

    def test_exec_filename(self):
        filename = "<warnings-test>"
        codeobj = compile(("import warnings\n"
                           "warnings.warn('hello', UserWarning)"),
                          filename, "exec")
        with original_warnings.catch_warnings(record=True) as w:
            self.module.simplefilter("always", category=UserWarning)
            exec(codeobj)
        self.assertEqual(w[0].filename, filename)

    def test_warn_explicit_non_ascii_filename(self):
        with original_warnings.catch_warnings(record=True,
                module=self.module) as w:
            self.module.resetwarnings()
            self.module.filterwarnings("always", category=UserWarning)
            filenames = ["nonascii\xe9\u20ac"]
            if not support.is_emscripten:
                # JavaScript does not like surrogates.
                # Invalid UTF-8 leading byte 0x80 encountered when
                # deserializing a UTF-8 string in wasm memory to a JS
                # string!
                filenames.append("surrogate\udc80")
            for filename in filenames:
                try:
                    os.fsencode(filename)
                except UnicodeEncodeError:
                    continue
                self.module.warn_explicit("text", UserWarning, filename, 1)
                self.assertEqual(w[-1].filename, filename)

    def test_warn_explicit_type_errors(self):
        # warn_explicit() should error out gracefully if it is given objects
        # of the wrong types.
        # lineno is expected to be an integer.
        self.assertRaises(TypeError, self.module.warn_explicit,
                            None, UserWarning, None, None)
        # Either 'message' needs to be an instance of Warning or 'category'
        # needs to be a subclass.
        self.assertRaises(TypeError, self.module.warn_explicit,
                            None, None, None, 1)
        # 'registry' must be a dict or None.
        self.assertRaises((TypeError, AttributeError),
                            self.module.warn_explicit,
                            None, Warning, None, 1, registry=42)

    def test_bad_str(self):
        # issue 6415
        # Warnings instance with a bad format string for __str__ should not
        # trigger a bus error.
        class BadStrWarning(Warning):
            """Warning with a bad format string for __str__."""
            def __str__(self):
                return ("A bad formatted string %(err)" %
                        {"err" : "there is no %(err)s"})

        with self.assertRaises(ValueError):
            self.module.warn(BadStrWarning())

    def test_warning_classes(self):
        class MyWarningClass(Warning):
            pass

        class NonWarningSubclass:
            pass

        # passing a non-subclass of Warning should raise a TypeError
        with self.assertRaises(TypeError) as cm:
            self.module.warn('bad warning category', '')
        self.assertIn('category must be a Warning subclass, not ',
                      str(cm.exception))

        with self.assertRaises(TypeError) as cm:
            self.module.warn('bad warning category', NonWarningSubclass)
        self.assertIn('category must be a Warning subclass, not ',
                      str(cm.exception))

        # check that warning instances also raise a TypeError
        with self.assertRaises(TypeError) as cm:
            self.module.warn('bad warning category', MyWarningClass())
        self.assertIn('category must be a Warning subclass, not ',
                      str(cm.exception))

        with original_warnings.catch_warnings(module=self.module):
            self.module.resetwarnings()
            self.module.filterwarnings('default')
            with self.assertWarns(MyWarningClass) as cm:
                self.module.warn('good warning category', MyWarningClass)
            self.assertEqual('good warning category', str(cm.warning))

            with self.assertWarns(UserWarning) as cm:
                self.module.warn('good warning category', None)
            self.assertEqual('good warning category', str(cm.warning))

            with self.assertWarns(MyWarningClass) as cm:
                self.module.warn('good warning category', MyWarningClass)
            self.assertIsInstance(cm.warning, Warning)

    def check_module_globals(self, module_globals):
        with original_warnings.catch_warnings(module=self.module, record=True) as w:
            self.module.filterwarnings('default')
            self.module.warn_explicit(
                'eggs', UserWarning, 'bar', 1,
                module_globals=module_globals)
        self.assertEqual(len(w), 1)
        self.assertEqual(w[0].category, UserWarning)
        self.assertEqual(str(w[0].message), 'eggs')

    def check_module_globals_error(self, module_globals, errmsg, errtype=ValueError):
        if self.module is py_warnings:
            self.check_module_globals(module_globals)
            return
        with original_warnings.catch_warnings(module=self.module, record=True) as w:
            self.module.filterwarnings('always')
            with self.assertRaisesRegex(errtype, re.escape(errmsg)):
                self.module.warn_explicit(
                    'eggs', UserWarning, 'bar', 1,
                    module_globals=module_globals)
        self.assertEqual(len(w), 0)

    def check_module_globals_deprecated(self, module_globals, msg):
        if self.module is py_warnings:
            self.check_module_globals(module_globals)
            return
        with original_warnings.catch_warnings(module=self.module, record=True) as w:
            self.module.filterwarnings('always')
            self.module.warn_explicit(
                'eggs', UserWarning, 'bar', 1,
                module_globals=module_globals)
        self.assertEqual(len(w), 2)
        self.assertEqual(w[0].category, DeprecationWarning)
        self.assertEqual(str(w[0].message), msg)
        self.assertEqual(w[1].category, UserWarning)
        self.assertEqual(str(w[1].message), 'eggs')

    def test_gh86298_no_loader_and_no_spec(self):
        self.check_module_globals({'__name__': 'bar'})

    def test_gh86298_loader_is_none_and_no_spec(self):
        self.check_module_globals({'__name__': 'bar', '__loader__': None})

    def test_gh86298_no_loader_and_spec_is_none(self):
        self.check_module_globals_error(
            {'__name__': 'bar', '__spec__': None},
            'Module globals is missing a __spec__.loader')

    def test_gh86298_loader_is_none_and_spec_is_none(self):
        self.check_module_globals_error(
            {'__name__': 'bar', '__loader__': None, '__spec__': None},
            'Module globals is missing a __spec__.loader')

    def test_gh86298_loader_is_none_and_spec_loader_is_none(self):
        self.check_module_globals_error(
            {'__name__': 'bar', '__loader__': None,
             '__spec__': types.SimpleNamespace(loader=None)},
            'Module globals is missing a __spec__.loader')

    def test_gh86298_no_spec(self):
        self.check_module_globals_deprecated(
            {'__name__': 'bar', '__loader__': object()},
            'Module globals is missing a __spec__.loader')

    def test_gh86298_spec_is_none(self):
        self.check_module_globals_deprecated(
            {'__name__': 'bar', '__loader__': object(), '__spec__': None},
            'Module globals is missing a __spec__.loader')

    def test_gh86298_no_spec_loader(self):
        self.check_module_globals_deprecated(
            {'__name__': 'bar', '__loader__': object(),
             '__spec__': types.SimpleNamespace()},
            'Module globals is missing a __spec__.loader')

    def test_gh86298_loader_and_spec_loader_disagree(self):
        self.check_module_globals_deprecated(
            {'__name__': 'bar', '__loader__': object(),
             '__spec__': types.SimpleNamespace(loader=object())},
            'Module globals; __loader__ != __spec__.loader')

    def test_gh86298_no_loader_and_no_spec_loader(self):
        self.check_module_globals_error(
            {'__name__': 'bar', '__spec__': types.SimpleNamespace()},
            'Module globals is missing a __spec__.loader', AttributeError)

    def test_gh86298_no_loader_with_spec_loader_okay(self):
        self.check_module_globals(
            {'__name__': 'bar',
             '__spec__': types.SimpleNamespace(loader=object())})

class CWarnTests(WarnTests, unittest.TestCase):
    module = c_warnings

    # TODO: RUSTPYTHON
    @unittest.expectedFailure
    # As an early adopter, we sanity check the
    # test.import_helper.import_fresh_module utility function
    def test_accelerated(self):
        self.assertIsNot(original_warnings, self.module)
        self.assertFalse(hasattr(self.module.warn, '__code__'))

    # TODO: RUSTPYTHON
    @unittest.expectedFailure
    def test_gh86298_no_loader_and_spec_is_none(self):
        return super().test_gh86298_no_loader_and_spec_is_none()

    # TODO: RUSTPYTHON
    @unittest.expectedFailure
    def test_gh86298_loader_is_none_and_spec_is_none(self):
        return super().test_gh86298_loader_is_none_and_spec_is_none()

    # TODO: RUSTPYTHON
    @unittest.expectedFailure
    def test_gh86298_loader_is_none_and_spec_loader_is_none(self):
        return super().test_gh86298_loader_is_none_and_spec_loader_is_none()
    
    # TODO: RUSTPYTHON
    @unittest.expectedFailure
    def test_gh86298_no_spec(self):
        return super().test_gh86298_no_spec()

    # TODO: RUSTPYTHON
    @unittest.expectedFailure
    def test_gh86298_spec_is_none(self):
        return super().test_gh86298_spec_is_none()

    # TODO: RUSTPYTHON
    @unittest.expectedFailure
    def test_gh86298_no_spec_loader(self):
        return super().test_gh86298_no_spec_loader()

    # TODO: RUSTPYTHON
    @unittest.expectedFailure
    def test_gh86298_loader_and_spec_loader_disagree(self):
        return super().test_gh86298_loader_and_spec_loader_disagree()

    # TODO: RUSTPYTHON
    @unittest.expectedFailure
    def test_gh86298_no_loader_and_no_spec_loader(self):
        return super().test_gh86298_no_loader_and_no_spec_loader()

class PyWarnTests(WarnTests, unittest.TestCase):
    module = py_warnings

    # As an early adopter, we sanity check the
    # test.import_helper.import_fresh_module utility function
    def test_pure_python(self):
        self.assertIsNot(original_warnings, self.module)
        self.assertTrue(hasattr(self.module.warn, '__code__'))


class WCmdLineTests(BaseTest):

    def test_improper_input(self):
        # Uses the private _setoption() function to test the parsing
        # of command-line warning arguments
        with original_warnings.catch_warnings(module=self.module):
            self.assertRaises(self.module._OptionError,
                              self.module._setoption, '1:2:3:4:5:6')
            self.assertRaises(self.module._OptionError,
                              self.module._setoption, 'bogus::Warning')
            self.assertRaises(self.module._OptionError,
                              self.module._setoption, 'ignore:2::4:-5')
            with self.assertRaises(self.module._OptionError):
                self.module._setoption('ignore::123')
            with self.assertRaises(self.module._OptionError):
                self.module._setoption('ignore::123abc')
            with self.assertRaises(self.module._OptionError):
                self.module._setoption('ignore::===')
            with self.assertRaisesRegex(self.module._OptionError, 'Wärning'):
                self.module._setoption('ignore::Wärning')
            self.module._setoption('error::Warning::0')
            self.assertRaises(UserWarning, self.module.warn, 'convert to error')

    def test_import_from_module(self):
        with original_warnings.catch_warnings(module=self.module):
            self.module._setoption('ignore::Warning')
            with self.assertRaises(self.module._OptionError):
                self.module._setoption('ignore::TestWarning')
            with self.assertRaises(self.module._OptionError):
                self.module._setoption('ignore::test.test_warnings.bogus')
            self.module._setoption('error::test.test_warnings.TestWarning')
            with self.assertRaises(TestWarning):
                self.module.warn('test warning', TestWarning)


class CWCmdLineTests(WCmdLineTests, unittest.TestCase):
    module = c_warnings


class PyWCmdLineTests(WCmdLineTests, unittest.TestCase):
    module = py_warnings

    # TODO: RUSTPYTHON
    @unittest.expectedFailure
    def test_improper_option(self):
        # Same as above, but check that the message is printed out when
        # the interpreter is executed. This also checks that options are
        # actually parsed at all.
        rc, out, err = assert_python_ok("-Wxxx", "-c", "pass")
        self.assertIn(b"Invalid -W option ignored: invalid action: 'xxx'", err)

    # TODO: RUSTPYTHON
    @unittest.expectedFailure
    def test_warnings_bootstrap(self):
        # Check that the warnings module does get loaded when -W<some option>
        # is used (see issue #10372 for an example of silent bootstrap failure).
        rc, out, err = assert_python_ok("-Wi", "-c",
            "import sys; sys.modules['warnings'].warn('foo', RuntimeWarning)")
        # '-Wi' was observed
        self.assertFalse(out.strip())
        self.assertNotIn(b'RuntimeWarning', err)


class _WarningsTests(BaseTest, unittest.TestCase):

    """Tests specific to the _warnings module."""

    module = c_warnings

    # TODO: RUSTPYTHON
    @unittest.expectedFailure
    def test_filter(self):
        # Everything should function even if 'filters' is not in warnings.
        with original_warnings.catch_warnings(module=self.module) as w:
            self.module.filterwarnings("error", "", Warning, "", 0)
            self.assertRaises(UserWarning, self.module.warn,
                                'convert to error')
            del self.module.filters
            self.assertRaises(UserWarning, self.module.warn,
                                'convert to error')

    # TODO: RUSTPYTHON
    @unittest.expectedFailure
    def test_onceregistry(self):
        # Replacing or removing the onceregistry should be okay.
        global __warningregistry__
        message = UserWarning('onceregistry test')
        try:
            original_registry = self.module.onceregistry
            __warningregistry__ = {}
            with original_warnings.catch_warnings(record=True,
                    module=self.module) as w:
                self.module.resetwarnings()
                self.module.filterwarnings("once", category=UserWarning)
                self.module.warn_explicit(message, UserWarning, "file", 42)
                self.assertEqual(w[-1].message, message)
                del w[:]
                self.module.warn_explicit(message, UserWarning, "file", 42)
                self.assertEqual(len(w), 0)
                # Test the resetting of onceregistry.
                self.module.onceregistry = {}
                __warningregistry__ = {}
                self.module.warn('onceregistry test')
                self.assertEqual(w[-1].message.args, message.args)
                # Removal of onceregistry is okay.
                del w[:]
                del self.module.onceregistry
                __warningregistry__ = {}
                self.module.warn_explicit(message, UserWarning, "file", 42)
                self.assertEqual(len(w), 0)
        finally:
            self.module.onceregistry = original_registry

    # TODO: RUSTPYTHON
    @unittest.expectedFailure
    def test_default_action(self):
        # Replacing or removing defaultaction should be okay.
        message = UserWarning("defaultaction test")
        original = self.module.defaultaction
        try:
            with original_warnings.catch_warnings(record=True,
                    module=self.module) as w:
                self.module.resetwarnings()
                registry = {}
                self.module.warn_explicit(message, UserWarning, "<test>", 42,
                                            registry=registry)
                self.assertEqual(w[-1].message, message)
                self.assertEqual(len(w), 1)
                # One actual registry key plus the "version" key
                self.assertEqual(len(registry), 2)
                self.assertIn("version", registry)
                del w[:]
                # Test removal.
                del self.module.defaultaction
                __warningregistry__ = {}
                registry = {}
                self.module.warn_explicit(message, UserWarning, "<test>", 43,
                                            registry=registry)
                self.assertEqual(w[-1].message, message)
                self.assertEqual(len(w), 1)
                self.assertEqual(len(registry), 2)
                del w[:]
                # Test setting.
                self.module.defaultaction = "ignore"
                __warningregistry__ = {}
                registry = {}
                self.module.warn_explicit(message, UserWarning, "<test>", 44,
                                            registry=registry)
                self.assertEqual(len(w), 0)
        finally:
            self.module.defaultaction = original

    def test_showwarning_missing(self):
        # Test that showwarning() missing is okay.
        text = 'del showwarning test'
        with original_warnings.catch_warnings(module=self.module):
            self.module.filterwarnings("always", category=UserWarning)
            del self.module.showwarning
            with support.captured_output('stderr') as stream:
                self.module.warn(text)
                result = stream.getvalue()
        self.assertIn(text, result)

    # TODO: RUSTPYTHON
    @unittest.expectedFailure
    def test_showwarnmsg_missing(self):
        # Test that _showwarnmsg() missing is okay.
        text = 'del _showwarnmsg test'
        with original_warnings.catch_warnings(module=self.module):
            self.module.filterwarnings("always", category=UserWarning)

            show = self.module._showwarnmsg
            try:
                del self.module._showwarnmsg
                with support.captured_output('stderr') as stream:
                    self.module.warn(text)
                    result = stream.getvalue()
            finally:
                self.module._showwarnmsg = show
        self.assertIn(text, result)

    def test_showwarning_not_callable(self):
        with original_warnings.catch_warnings(module=self.module):
            self.module.filterwarnings("always", category=UserWarning)
            self.module.showwarning = print
            with support.captured_output('stdout'):
                self.module.warn('Warning!')
            self.module.showwarning = 23
            self.assertRaises(TypeError, self.module.warn, "Warning!")

    def test_show_warning_output(self):
        # With showwarning() missing, make sure that output is okay.
        text = 'test show_warning'
        with original_warnings.catch_warnings(module=self.module):
            self.module.filterwarnings("always", category=UserWarning)
            del self.module.showwarning
            with support.captured_output('stderr') as stream:
                warning_tests.inner(text)
                result = stream.getvalue()
        self.assertEqual(result.count('\n'), 2,
                             "Too many newlines in %r" % result)
        first_line, second_line = result.split('\n', 1)
        expected_file = os.path.splitext(warning_tests.__file__)[0] + '.py'
        first_line_parts = first_line.rsplit(':', 3)
        path, line, warning_class, message = first_line_parts
        line = int(line)