Closes #26559: Allow configuring flush-on-close behaviour of MemoryHandler.
diff --git a/Lib/test/test_logging.py b/Lib/test/test_logging.py
index 062df0f..9e9a439 100644
--- a/Lib/test/test_logging.py
+++ b/Lib/test/test_logging.py
@@ -958,7 +958,7 @@
def setUp(self):
BaseTest.setUp(self)
self.mem_hdlr = logging.handlers.MemoryHandler(10, logging.WARNING,
- self.root_hdlr)
+ self.root_hdlr)
self.mem_logger = logging.getLogger('mem')
self.mem_logger.propagate = 0
self.mem_logger.addHandler(self.mem_hdlr)
@@ -995,6 +995,36 @@
self.mem_logger.debug(self.next_message())
self.assert_log_lines(lines)
+ def test_flush_on_close(self):
+ """
+ Test that the flush-on-close configuration works as expected.
+ """
+ self.mem_logger.debug(self.next_message())
+ self.assert_log_lines([])
+ self.mem_logger.info(self.next_message())
+ self.assert_log_lines([])
+ self.mem_logger.removeHandler(self.mem_hdlr)
+ # Default behaviour is to flush on close. Check that it happens.
+ self.mem_hdlr.close()
+ lines = [
+ ('DEBUG', '1'),
+ ('INFO', '2'),
+ ]
+ self.assert_log_lines(lines)
+ # Now configure for flushing not to be done on close.
+ self.mem_hdlr = logging.handlers.MemoryHandler(10, logging.WARNING,
+ self.root_hdlr,
+ False)
+ self.mem_logger.addHandler(self.mem_hdlr)
+ self.mem_logger.debug(self.next_message())
+ self.assert_log_lines(lines) # no change
+ self.mem_logger.info(self.next_message())
+ self.assert_log_lines(lines) # no change
+ self.mem_logger.removeHandler(self.mem_hdlr)
+ self.mem_hdlr.close()
+ # assert that no new lines have been added
+ self.assert_log_lines(lines) # no change
+
class ExceptionFormatter(logging.Formatter):
"""A special exception formatter."""