from contextlib import contextmanager import linecache import os from io import StringIO import re import sys import textwrap 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.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 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"] 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_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") 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 = "" 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) class CWarnTests(WarnTests, unittest.TestCase): module = c_warnings # 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__')) 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 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) def test_warnings_bootstrap(self): # Check that the warnings module does get loaded when -W # 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 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') 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 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, "", 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, "", 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, "", 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) 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) self.assertEqual(expected_file, path) self.assertEqual(warning_class, ' ' + UserWarning.__name__) self.assertEqual(message, ' ' + text) expected_line = ' ' + linecache.getline(path, line).strip() + '\n' assert expected_line self.assertEqual(second_line, expected_line) def test_filename_none(self): # issue #12467: race condition if a warning is emitted at shutdown globals_dict = globals() oldfile = globals_dict['__file__'] try: catch = original_warnings.catch_warnings(record=True, module=self.module) with catch as w: self.module.filterwarnings("always", category=UserWarning) globals_dict['__file__'] = None original_warnings.warn('test', UserWarning) self.assertTrue(len(w)) finally: globals_dict['__file__'] = oldfile def test_stderr_none(self): rc, stdout, stderr = assert_python_ok("-c", "import sys; sys.stderr = None; " "import warnings; warnings.simplefilter('always'); " "warnings.warn('Warning!')") self.assertEqual(stdout, b'') self.assertNotIn(b'Warning!', stderr) self.assertNotIn(b'Error', stderr) def test_issue31285(self): # warn_explicit() should neither raise a SystemError nor cause an # assertion failure, in case the return value of get_source() has a # bad splitlines() method. def get_bad_loader(splitlines_ret_val): class BadLoader: def get_source(self, fullname): class BadSource(str): def splitlines(self): return splitlines_ret_val return BadSource('spam') return BadLoader() wmod = self.module with original_warnings.catch_warnings(module=wmod): wmod.filterwarnings('default', category=UserWarning) with support.captured_stderr() as stderr: wmod.warn_explicit( 'foo', UserWarning, 'bar', 1, module_globals={'__loader__': get_bad_loader(42), '__name__': 'foobar'}) self.assertIn('UserWarning: foo', stderr.getvalue()) show = wmod._showwarnmsg try: del wmod._showwarnmsg with support.captured_stderr() as stderr: wmod.warn_explicit( 'eggs', UserWarning, 'bar', 1, module_globals={'__loader__': get_bad_loader([42]), '__name__': 'foobar'}) self.assertIn('UserWarning: eggs', stderr.getvalue()) finally: wmod._showwarnmsg = show @support.cpython_only def test_issue31411(self): # warn_explicit() shouldn't raise a SystemError in case # warnings.onceregistry isn't a dictionary. wmod = self.module with original_warnings.catch_warnings(module=wmod): wmod.filterwarnings('once') with support.swap_attr(wmod, 'onceregistry', None): with self.assertRaises(TypeError): wmod.warn_explicit('foo', Warning, 'bar', 1, registry=None) @support.cpython_only def test_issue31416(self): # warn_explicit() shouldn't cause an assertion failure in case of a # bad warnings.filters or warnings.defaultaction. wmod = self.module with original_warnings.catch_warnings(module=wmod): wmod.filters = [(None, None, Warning, None, 0)] with self.assertRaises(TypeError): wmod.warn_explicit('foo', Warning, 'bar', 1) wmod.filters = [] with support.swap_attr(wmod, 'defaultaction', None), \ self.assertRaises(TypeError): wmod.warn_explicit('foo', Warning, 'bar', 1) @support.cpython_only def test_issue31566(self): # warn() shouldn't cause an assertion failure in case of a bad # __name__ global. with original_warnings.catch_warnings(module=self.module): self.module.filterwarnings('error', category=UserWarning) with support.swap_item(globals(), '__name__', b'foo'), \ support.swap_item(globals(), '__file__', None): self.assertRaises(UserWarning, self.module.warn, 'bar') class WarningsDisplayTests(BaseTest): """Test the displaying of warnings and the ability to overload functions related to displaying warnings.""" def test_formatwarning(self): message = "msg" category = Warning file_name = os.path.splitext(warning_tests.__file__)[0] + '.py' line_num = 5 file_line = linecache.getline(file_name, line_num).strip() format = "%s:%s: %s: %s\n %s\n" expect = format % (file_name, line_num, category.__name__, message, file_line) self.assertEqual(expect, self.module.formatwarning(message, category, file_name, line_num)) # Test the 'line' argument. file_line += " for the win!" expect = format % (file_name, line_num, category.__name__, message, file_line) self.assertEqual(expect, self.module.formatwarning(message, category, file_name, line_num, file_line)) def test_showwarning(self): file_name = os.path.splitext(warning_tests.__file__)[0] + '.py' line_num = 3 expected_file_line = linecache.getline(file_name, line_num).strip() message = 'msg' category = Warning file_object = StringIO() expect = self.module.formatwarning(message, category, file_name, line_num) self.module.showwarning(message, category, file_name, line_num, file_object) self.assertEqual(file_object.getvalue(), expect) # Test 'line' argument. expected_file_line += "for the win!" expect = self.module.formatwarning(message, category, file_name, line_num, expected_file_line) file_object = StringIO() self.module.showwarning(message, category, file_name, line_num, file_object, expected_file_line) self.assertEqual(expect, file_object.getvalue()) def test_formatwarning_override(self): # bpo-35178: Test that a custom formatwarning function gets the 'line' # argument as a positional argument, and not only as a keyword argument def myformatwarning(message, category, filename, lineno, text): return f'm={message}:c={category}:f={filename}:l={lineno}:t={text}' file_name = os.path.splitext(warning_tests.__file__)[0] + '.py' line_num = 3 file_line = linecache.getline(file_name, line_num).strip() message = 'msg' category = Warning file_object = StringIO() expected = f'm={message}:c={category}:f={file_name}:l={line_num}' + \ f':t={file_line}' with support.swap_attr(self.module, 'formatwarning', myformatwarning): self.module.showwarning(message, category, file_name, line_num, file_object, file_line) self.assertEqual(file_object.getvalue(), expected) class CWarningsDisplayTests(WarningsDisplayTests, unittest.TestCase): module = c_warnings class PyWarningsDisplayTests(WarningsDisplayTests, unittest.TestCase): module = py_warnings def test_tracemalloc(self): self.addCleanup(os_helper.unlink, os_helper.TESTFN) with open(os_helper.TESTFN, 'w', encoding="utf-8") as fp: fp.write(textwrap.dedent(""" def func(): f = open(__file__, "rb") # Emit ResourceWarning f = None func() """)) def run(*args): res = assert_python_ok(*args, PYTHONIOENCODING='utf-8') stderr = res.err.decode('utf-8', 'replace') stderr = '\n'.join(stderr.splitlines()) # normalize newlines stderr = re.sub('<.*>', '<...>', stderr) return stderr # tracemalloc disabled filename = os.path.abspath(os_helper.TESTFN) stderr = run('-Wd', os_helper.TESTFN) expected = textwrap.dedent(f''' {filename}:5: ResourceWarning: unclosed file <...> f = None ResourceWarning: Enable tracemalloc to get the object allocation traceback ''').strip() self.assertEqual(stderr, expected) # tracemalloc enabled stderr = run('-Wd', '-X', 'tracemalloc=2', os_helper.TESTFN) expected = textwrap.dedent(f''' {filename}:5: ResourceWarning: unclosed file <...> f = None Object allocated at (most recent call last): File "{filename}", lineno 7 func() File "{filename}", lineno 3 f = open(__file__, "rb") ''').strip() self.assertEqual(stderr, expected) class CatchWarningTests(BaseTest): """Test catch_warnings().""" def test_catch_warnings_restore(self): wmod = self.module orig_filters = wmod.filters orig_showwarning = wmod.showwarning # Ensure both showwarning and filters are restored when recording with wmod.catch_warnings(module=wmod, record=True): wmod.filters = wmod.showwarning = object() self.assertIs(wmod.filters, orig_filters) self.assertIs(wmod.showwarning, orig_showwarning) # Same test, but with recording disabled with wmod.catch_warnings(module=wmod, record=False): wmod.filters = wmod.showwarning = object() self.assertIs(wmod.filters, orig_filters) self.assertIs(wmod.showwarning, orig_showwarning) def test_catch_warnings_recording(self): wmod = self.module # Ensure warnings are recorded when requested with wmod.catch_warnings(module=wmod, record=True) as w: self.assertEqual(w, []) self.assertIs(type(w), list) wmod.simplefilter("always") wmod.warn("foo") self.assertEqual(str(w[-1].message), "foo") wmod.warn("bar") self.assertEqual(str(w[-1].message), "bar") self.assertEqual(str(w[0].message), "foo") self.assertEqual(str(w[1].message), "bar") del w[:] self.assertEqual(w, []) # Ensure warnings are not recorded when not requested orig_showwarning = wmod.showwarning with wmod.catch_warnings(module=wmod, record=False) as w: self.assertIsNone(w) self.assertIs(wmod.showwarning, orig_showwarning) def test_catch_warnings_reentry_guard(self): wmod = self.module # Ensure catch_warnings is protected against incorrect usage x = wmod.catch_warnings(module=wmod, record=True) self.assertRaises(RuntimeError, x.__exit__) with x: self.assertRaises(RuntimeError, x.__enter__) # Same test, but with recording disabled x = wmod.catch_warnings(module=wmod, record=False) self.assertRaises(RuntimeError, x.__exit__) with x: self.assertRaises(RuntimeError, x.__enter__) def test_catch_warnings_defaults(self): wmod = self.module orig_filters = wmod.filters orig_showwarning = wmod.showwarning # Ensure default behaviour is not to record warnings with wmod.catch_warnings(module=wmod) as w: self.assertIsNone(w) self.assertIs(wmod.showwarning, orig_showwarning) self.assertIsNot(wmod.filters, orig_filters) self.assertIs(wmod.filters, orig_filters) if wmod is sys.modules['warnings']: # Ensure the default module is this one with wmod.catch_warnings() as w: self.assertIsNone(w) self.assertIs(wmod.showwarning, orig_showwarning) self.assertIsNot(wmod.filters, orig_filters) self.assertIs(wmod.filters, orig_filters) def test_record_override_showwarning_before(self): # Issue #28835: If warnings.showwarning() was overridden, make sure # that catch_warnings(record=True) overrides it again. text = "This is a warning" wmod = self.module my_log = [] def my_logger(message, category, filename, lineno, file=None, line=None): nonlocal my_log my_log.append(message) # Override warnings.showwarning() before calling catch_warnings() with support.swap_attr(wmod, 'showwarning', my_logger): with wmod.catch_warnings(module=wmod, record=True) as log: self.assertIsNot(wmod.showwarning, my_logger) wmod.simplefilter("always") wmod.warn(text) self.assertIs(wmod.showwarning, my_logger) self.assertEqual(len(log), 1, log) self.assertEqual(log[0].message.args[0], text) self.assertEqual(my_log, []) def test_record_override_showwarning_inside(self): # Issue #28835: It is possible to override warnings.showwarning() # in the catch_warnings(record=True) context manager. text = "This is a warning" wmod = self.module my_log = [] def my_logger(message, category, filename, lineno, file=None, line=None): nonlocal my_log my_log.append(message) with wmod.catch_warnings(module=wmod, record=True) as log: wmod.simplefilter("always") wmod.showwarning = my_logger wmod.warn(text) self.assertEqual(len(my_log), 1, my_log) self.assertEqual(my_log[0].args[0], text) self.assertEqual(log, []) def test_check_warnings(self): # Explicit tests for the test.support convenience wrapper wmod = self.module if wmod is not sys.modules['warnings']: self.skipTest('module to test is not loaded warnings module') with warnings_helper.check_warnings(quiet=False) as w: self.assertEqual(w.warnings, []) wmod.simplefilter("always") wmod.warn("foo") self.assertEqual(str(w.message), "foo") wmod.warn("bar") self.assertEqual(str(w.message), "bar") self.assertEqual(str(w.warnings[0].message), "foo") self.assertEqual(str(w.warnings[1].message), "bar") w.reset() self.assertEqual(w.warnings, []) with warnings_helper.check_warnings(): # defaults to quiet=True without argument pass with warnings_helper.check_warnings(('foo', UserWarning)): wmod.warn("foo") with self.assertRaises(AssertionError): with warnings_helper.check_warnings(('', RuntimeWarning)): # defaults to quiet=False with argument pass with self.assertRaises(AssertionError): with warnings_helper.check_warnings(('foo', RuntimeWarning)): wmod.warn("foo") class CCatchWarningTests(CatchWarningTests, unittest.TestCase): module = c_warnings class PyCatchWarningTests(CatchWarningTests, unittest.TestCase): module = py_warnings class EnvironmentVariableTests(BaseTest): def test_single_warning(self): rc, stdout, stderr = assert_python_ok("-c", "import sys; sys.stdout.write(str(sys.warnoptions))", PYTHONWARNINGS="ignore::DeprecationWarning", PYTHONDEVMODE="") self.assertEqual(stdout, b"['ignore::DeprecationWarning']") def test_comma_separated_warnings(self): rc, stdout, stderr = assert_python_ok("-c", "import sys; sys.stdout.write(str(sys.warnoptions))", PYTHONWARNINGS="ignore::DeprecationWarning,ignore::UnicodeWarning", PYTHONDEVMODE="") self.assertEqual(stdout, b"['ignore::DeprecationWarning', 'ignore::UnicodeWarning']") def test_envvar_and_command_line(self): rc, stdout, stderr = assert_python_ok("-Wignore::UnicodeWarning", "-c", "import sys; sys.stdout.write(str(sys.warnoptions))", PYTHONWARNINGS="ignore::DeprecationWarning", PYTHONDEVMODE="") self.assertEqual(stdout, b"['ignore::DeprecationWarning', 'ignore::UnicodeWarning']") def test_conflicting_envvar_and_command_line(self): rc, stdout, stderr = assert_python_failure("-Werror::DeprecationWarning", "-c", "import sys, warnings; sys.stdout.write(str(sys.warnoptions)); " "warnings.warn('Message', DeprecationWarning)", PYTHONWARNINGS="default::DeprecationWarning", PYTHONDEVMODE="") self.assertEqual(stdout, b"['default::DeprecationWarning', 'error::DeprecationWarning']") self.assertEqual(stderr.splitlines(), [b"Traceback (most recent call last):", b" File \"\", line 1, in ", b' import sys, warnings; sys.stdout.write(str(sys.warnoptions)); warnings.w' b"arn('Message', DeprecationWarning)", b' ^^^^^^^^^^' b'^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^', b"DeprecationWarning: Message"]) def test_default_filter_configuration(self): pure_python_api = self.module is py_warnings if support.Py_DEBUG: expected_default_filters = [] else: if pure_python_api: main_module_filter = re.compile("__main__") else: main_module_filter = "__main__" expected_default_filters = [ ('default', None, DeprecationWarning, main_module_filter, 0), ('ignore', None, DeprecationWarning, None, 0), ('ignore', None, PendingDeprecationWarning, None, 0), ('ignore', None, ImportWarning, None, 0), ('ignore', None, ResourceWarning, None, 0), ] expected_output = [str(f).encode() for f in expected_default_filters] if pure_python_api: # Disable the warnings acceleration module in the subprocess code = "import sys; sys.modules.pop('warnings', None); sys.modules['_warnings'] = None; " else: code = "" code += "import warnings; [print(f) for f in warnings.filters]" rc, stdout, stderr = assert_python_ok("-c", code, __isolated=True) stdout_lines = [line.strip() for line in stdout.splitlines()] self.maxDiff = None self.assertEqual(stdout_lines, expected_output) @unittest.skipUnless(sys.getfilesystemencoding() != 'ascii', 'requires non-ascii filesystemencoding') def test_nonascii(self): PYTHONWARNINGS="ignore:DeprecationWarning" + os_helper.FS_NONASCII rc, stdout, stderr = assert_python_ok("-c", "import sys; sys.stdout.write(str(sys.warnoptions))", PYTHONIOENCODING="utf-8", PYTHONWARNINGS=PYTHONWARNINGS, PYTHONDEVMODE="") self.assertEqual(stdout, str([PYTHONWARNINGS]).encode()) class CEnvironmentVariableTests(EnvironmentVariableTests, unittest.TestCase): module = c_warnings class PyEnvironmentVariableTests(EnvironmentVariableTests, unittest.TestCase): module = py_warnings class _DeprecatedTest(BaseTest, unittest.TestCase): """Test _deprecated().""" module = original_warnings def test_warning(self): version = (3, 11, 0, "final", 0) test = [(4, 12), (4, 11), (4, 0), (3, 12)] for remove in test: msg = rf".*test_warnings.*{remove[0]}\.{remove[1]}" filter = msg, DeprecationWarning with self.subTest(remove=remove): with warnings_helper.check_warnings(filter, quiet=False): self.module._deprecated("test_warnings", remove=remove, _version=version) version = (3, 11, 0, "alpha", 0) msg = r".*test_warnings.*3\.11" with warnings_helper.check_warnings((msg, DeprecationWarning), quiet=False): self.module._deprecated("test_warnings", remove=(3, 11), _version=version) def test_RuntimeError(self): version = (3, 11, 0, "final", 0) test = [(2, 0), (2, 12), (3, 10)] for remove in test: with self.subTest(remove=remove): with self.assertRaises(RuntimeError): self.module._deprecated("test_warnings", remove=remove, _version=version) for level in ["beta", "candidate", "final"]: version = (3, 11, 0, level, 0) with self.subTest(releaselevel=level): with self.assertRaises(RuntimeError): self.module._deprecated("test_warnings", remove=(3, 11), _version=version) class BootstrapTest(unittest.TestCase): def test_issue_8766(self): # "import encodings" emits a warning whereas the warnings is not loaded # or not completely loaded (warnings imports indirectly encodings by # importing linecache) yet with os_helper.temp_cwd() as cwd, os_helper.temp_cwd('encodings'): # encodings loaded by initfsencoding() assert_python_ok('-c', 'pass', PYTHONPATH=cwd) # Use -W to load warnings module at startup assert_python_ok('-c', 'pass', '-W', 'always', PYTHONPATH=cwd) class FinalizationTest(unittest.TestCase): def test_finalization(self): # Issue #19421: warnings.warn() should not crash # during Python finalization code = """ import warnings warn = warnings.warn class A: def __del__(self): warn("test") a=A() """ rc, out, err = assert_python_ok("-c", code) self.assertEqual(err.decode().rstrip(), ':7: UserWarning: test') def test_late_resource_warning(self): # Issue #21925: Emitting a ResourceWarning late during the Python # shutdown must be logged. expected = b"sys:1: ResourceWarning: unclosed file " # don't import the warnings module # (_warnings will try to import it) code = "f = open(%a)" % __file__ rc, out, err = assert_python_ok("-Wd", "-c", code) self.assertTrue(err.startswith(expected), ascii(err)) # import the warnings module code = "import warnings; f = open(%a)" % __file__ rc, out, err = assert_python_ok("-Wd", "-c", code) self.assertTrue(err.startswith(expected), ascii(err)) def setUpModule(): py_warnings.onceregistry.clear() c_warnings.onceregistry.clear() tearDownModule = setUpModule if __name__ == "__main__": unittest.main()