Issue #4237: io.FileIO() was raising invalid warnings caused by insufficient initialization of PyFileIOObject struct members.
diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py
index 9ef2a81..08a524f 100644
--- a/Lib/test/test_io.py
+++ b/Lib/test/test_io.py
@@ -1236,6 +1236,13 @@
else:
self.assert_(issubclass(obj, io.IOBase))
+ def test_fileio_warnings(self):
+ with test_support.check_warnings() as w:
+ self.assertEqual(w.warnings, [])
+ self.assertRaises(TypeError, io.FileIO, [])
+ self.assertEqual(w.warnings, [])
+ self.assertRaises(ValueError, io.FileIO, "/some/invalid/name", "rt")
+ self.assertEqual(w.warnings, [])
def test_main():
test_support.run_unittest(IOTest, BytesIOTest, StringIOTest,