Issue #8766: Initialize _warnings module before importing the first module.
Fix a crash if an empty directory called "encodings" exists in sys.path.
diff --git a/Lib/test/test_warnings.py b/Lib/test/test_warnings.py
index 5f6a670..52b9dbe 100644
--- a/Lib/test/test_warnings.py
+++ b/Lib/test/test_warnings.py
@@ -738,20 +738,38 @@
module = py_warnings
+class BootstrapTest(unittest.TestCase):
+ def test_issue_8766(self):
+ # "import encodings" emits a warning whereas the warnings is not loaded
+ # or not completly loaded (warnings imports indirectly encodings by
+ # importing linecache) yet
+ with support.temp_cwd() as cwd, support.temp_cwd('encodings'):
+ env = os.environ.copy()
+ env['PYTHONPATH'] = cwd
+
+ # encodings loaded by initfsencoding()
+ retcode = subprocess.call([sys.executable, '-c', 'pass'], env=env)
+ self.assertEqual(retcode, 0)
+
+ # Use -W to load warnings module at startup
+ retcode = subprocess.call(
+ [sys.executable, '-c', 'pass', '-W', 'always'],
+ env=env)
+ self.assertEqual(retcode, 0)
+
def test_main():
py_warnings.onceregistry.clear()
c_warnings.onceregistry.clear()
- support.run_unittest(CFilterTests,
- PyFilterTests,
- CWarnTests,
- PyWarnTests,
- CWCmdLineTests, PyWCmdLineTests,
- _WarningsTests,
- CWarningsDisplayTests, PyWarningsDisplayTests,
- CCatchWarningTests, PyCatchWarningTests,
- CEnvironmentVariableTests,
- PyEnvironmentVariableTests
- )
+ support.run_unittest(
+ CFilterTests, PyFilterTests,
+ CWarnTests, PyWarnTests,
+ CWCmdLineTests, PyWCmdLineTests,
+ _WarningsTests,
+ CWarningsDisplayTests, PyWarningsDisplayTests,
+ CCatchWarningTests, PyCatchWarningTests,
+ CEnvironmentVariableTests, PyEnvironmentVariableTests,
+ BootstrapTest,
+ )
if __name__ == "__main__":