id summary reporter owner description type status component version severity resolution keywords cc stage has_patch needs_docs needs_tests needs_better_patch easy ui_ux 36491 AttributeError: '_io.TextIOWrapper' object has no attribute 'getvalue' when setUpTestData raises and tests are run with –parallel –buffer Rafael Carlos Soriano Marmol Shubham Akhilesh Singh "Similar issue reported here: https://code.djangoproject.com/ticket/35794 If a test class raises an exception in setUpTestData(), the failure is reported correctly when tests are executed • in sequence, or • in parallel without buffering (--parallel only). However, running the same suite with both **--parallel and --buffer** causes the test run to abort with an unrelated AttributeError, and the original exception is lost. Minimal reproducer {{{ # tests/test_issue.py from django.test import TestCase class AbortingTest(TestCase): @classmethod def setUpTestData(cls): raise RuntimeError(""Boo!"") def test_pass(self): pass class AnotherAbortingTest(TestCase): @classmethod def setUpTestData(cls): raise RuntimeError(""Boo Too!"") def test_pass(self): pass }}} the errors are reported clearly when running tests in sequence or --parallel **without --buffer** {{{ ====================================================================== ERROR: setUpClass (investment.investment.tests.test_issue.AnotherAbortingTest) ---------------------------------------------------------------------- Traceback (most recent call last): File ""/opt/homebrew/Cellar/python@3.12/3.12.11/Frameworks/Python.framework/Versions/3.12/lib/python3.12/unittest/suite.py"", line 166, in _handleClassSetUp setUpClass() File ""/Users/rafaelsm@backbase.com/dell/home/rsoriano/repositorios/docker-indiana/venvs/indiana_3_12/lib/python3.12/site-packages/django/test/testcases.py"", line 1426, in setUpClass cls.setUpTestData() ^^^^^^^^^^^^^^^^^ File ""/Users/rafaelsm@backbase.com/dell/home/rsoriano/repositorios/docker-indiana/Indiana/investment/investment/tests/test_issue.py"", line 16, in setUpTestData raise RuntimeError(""Boo Too!"") ^^^^^^^^^^^^^^^^^ RuntimeError: Boo Too! ====================================================================== ERROR: setUpClass (investment.investment.tests.test_issue.AbortingTest) ---------------------------------------------------------------------- Traceback (most recent call last): File ""/opt/homebrew/Cellar/python@3.12/3.12.11/Frameworks/Python.framework/Versions/3.12/lib/python3.12/unittest/suite.py"", line 166, in _handleClassSetUp setUpClass() File ""/Users/rafaelsm@backbase.com/dell/home/rsoriano/repositorios/docker-indiana/venvs/indiana_3_12/lib/python3.12/site-packages/django/test/testcases.py"", line 1426, in setUpClass cls.setUpTestData() ^^^^^^^^^^^^^^^^^ File ""/Users/rafaelsm@backbase.com/dell/home/rsoriano/repositorios/docker-indiana/Indiana/investment/investment/tests/test_issue.py"", line 7, in setUpTestData raise RuntimeError(""Boo!"") ^^^^^^^^^^^^^^^^^ RuntimeError: Boo! ---------------------------------------------------------------------- Ran 0 tests in 4.715s FAILED (errors=2) }}} ❌ Fails (parallel **with** buffer) python manage.py test tests.test_issue --parallel --buffer {{{ Destroying test database for alias 'default'... Traceback (most recent call last): File ""/Users/rafaelsm@backbase.com/dell/home/rsoriano/repositorios/docker-indiana/Indiana/manage.py"", line 34, in main() File ""/Users/rafaelsm@backbase.com/dell/home/rsoriano/repositorios/docker-indiana/Indiana/manage.py"", line 29, in main execute_from_command_line(sys.argv) File ""/Users/rafaelsm@backbase.com/dell/home/rsoriano/repositorios/docker-indiana/venvs/indiana_3_12/lib/python3.12/site-packages/django/core/management/__init__.py"", line 442, in execute_from_command_line utility.execute() File ""/Users/rafaelsm@backbase.com/dell/home/rsoriano/repositorios/docker-indiana/venvs/indiana_3_12/lib/python3.12/site-packages/django/core/management/__init__.py"", line 436, in execute self.fetch_command(subcommand).run_from_argv(self.argv) File ""/Users/rafaelsm@backbase.com/dell/home/rsoriano/repositorios/docker-indiana/venvs/indiana_3_12/lib/python3.12/site-packages/django/core/management/commands/test.py"", line 24, in run_from_argv super().run_from_argv(argv) File ""/Users/rafaelsm@backbase.com/dell/home/rsoriano/repositorios/docker-indiana/venvs/indiana_3_12/lib/python3.12/site-packages/django/core/management/base.py"", line 416, in run_from_argv self.execute(*args, **cmd_options) File ""/Users/rafaelsm@backbase.com/dell/home/rsoriano/repositorios/docker-indiana/venvs/indiana_3_12/lib/python3.12/site-packages/django/core/management/base.py"", line 460, in execute output = self.handle(*args, **options) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File ""/Users/rafaelsm@backbase.com/dell/home/rsoriano/repositorios/docker-indiana/venvs/indiana_3_12/lib/python3.12/site-packages/django/core/management/commands/test.py"", line 63, in handle failures = test_runner.run_tests(test_labels) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File ""/Users/rafaelsm@backbase.com/dell/home/rsoriano/repositorios/docker-indiana/venvs/indiana_3_12/lib/python3.12/site-packages/django/test/runner.py"", line 1099, in run_tests result = self.run_suite(suite) ^^^^^^^^^^^^^^^^^^^^^ File ""/Users/rafaelsm@backbase.com/dell/home/rsoriano/repositorios/docker-indiana/venvs/indiana_3_12/lib/python3.12/site-packages/django/test/runner.py"", line 1026, in run_suite return runner.run(suite) ^^^^^^^^^^^^^^^^^ File ""/opt/homebrew/Cellar/python@3.12/3.12.11/Frameworks/Python.framework/Versions/3.12/lib/python3.12/unittest/runner.py"", line 240, in run test(result) File ""/opt/homebrew/Cellar/python@3.12/3.12.11/Frameworks/Python.framework/Versions/3.12/lib/python3.12/unittest/suite.py"", line 84, in __call__ return self.run(*args, **kwds) ^^^^^^^^^^^^^^^^^^^^^^^ File ""/Users/rafaelsm@backbase.com/dell/home/rsoriano/repositorios/docker-indiana/venvs/indiana_3_12/lib/python3.12/site-packages/django/test/runner.py"", line 562, in run self.handle_event(result, tests, event) File ""/Users/rafaelsm@backbase.com/dell/home/rsoriano/repositorios/docker-indiana/venvs/indiana_3_12/lib/python3.12/site-packages/django/test/runner.py"", line 586, in handle_event handler(test, *args) File ""/opt/homebrew/Cellar/python@3.12/3.12.11/Frameworks/Python.framework/Versions/3.12/lib/python3.12/unittest/runner.py"", line 101, in addError super(TextTestResult, self).addError(test, err) File ""/opt/homebrew/Cellar/python@3.12/3.12.11/Frameworks/Python.framework/Versions/3.12/lib/python3.12/unittest/result.py"", line 17, in inner return method(self, *args, **kw) ^^^^^^^^^^^^^^^^^^^^^^^^^ File ""/opt/homebrew/Cellar/python@3.12/3.12.11/Frameworks/Python.framework/Versions/3.12/lib/python3.12/unittest/result.py"", line 116, in addError self.errors.append((test, self._exc_info_to_string(err, test))) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File ""/opt/homebrew/Cellar/python@3.12/3.12.11/Frameworks/Python.framework/Versions/3.12/lib/python3.12/unittest/result.py"", line 195, in _exc_info_to_string output = sys.stdout.getvalue() ^^^^^^^^^^^^^^^^^^^ AttributeError: '_io.TextIOWrapper' object has no attribute 'getvalue' }}} * The traceback contains no reference to the original RuntimeError(""Boo!"") / RuntimeError(""Boo Too!""). **Expected behaviour** With --parallel --buffer the test runner should report the same clear RuntimeError stack traces shown when buffering is disabled. **Actual behaviour** The run aborts with an AttributeError deep inside unittest.result, and the real test failures are swallowed. ** Additional details ** * tblib installed (latest version == 3.1.0) * logging => logging.StreamHandler * Removing either --parallel or --buffer avoids the issue. Similar issue reported here: https://code.djangoproject.com/ticket/35794 Edit: issue also happens with exceptions inside setUpClass (--parallel --buffer) {{{ class AbortingTest(TestCase): @classmethod def setUpClass(cls): raise RuntimeError(""Boo!"") def test_pass(self): pass }}} " Bug closed Testing framework 5.2 Normal fixed tests, parallel, buffer Adam Johnson Ready for checkin 1 0 0 0 0 0