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# -*- coding: utf-8 -*-
# test_streamtologger.py
# Copyright (C) 2013 LEAP
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
tests for streamtologger
"""
try:
import unittest2 as unittest
except ImportError:
import unittest
import logging
import sys
from leap.util.streamtologger import StreamToLogger
from leap.common.testing.basetest import BaseLeapTest
class SimpleLogHandler(logging.Handler):
"""
The simplest log handler that allows to check if the log was
delivered to the handler correctly.
"""
def __init__(self):
logging.Handler.__init__(self)
self._last_log = ""
self._last_log_level = ""
def emit(self, record):
self._last_log = record.getMessage()
self._last_log_level = record.levelno
def get_last_log(self):
"""
Returns the last logged message by this handler.
:return: the last logged message.
:rtype: str
"""
return self._last_log
def get_last_log_level(self):
"""
Returns the level of the last logged message by this handler.
:return: the last logged level.
:rtype: str
"""
return self._last_log_level
class StreamToLoggerTest(BaseLeapTest):
"""
StreamToLogger's tests.
NOTE: we may need to find a way to test the use case that an exception
is raised. I couldn't catch the output of an exception because the
test failed if some exception is raised.
"""
def setUp(self):
# Create the logger
level = logging.DEBUG
self.logger = logging.getLogger(name='test')
self.logger.setLevel(level)
# Simple log handler
self.handler = SimpleLogHandler()
self.logger.addHandler(self.handler)
# Preserve original values
self._sys_stdout = sys.stdout
self._sys_stderr = sys.stderr
# Create the handler
sys.stdout = StreamToLogger(self.logger, logging.DEBUG)
sys.stderr = StreamToLogger(self.logger, logging.ERROR)
def tearDown(self):
# Restore original values
sys.stdout = self._sys_stdout
sys.stderr = self._sys_stderr
def test_logger_starts_empty(self):
self.assertEqual(self.handler.get_last_log(), '')
def test_standard_output(self):
message = 'Test string'
print message
log = self.handler.get_last_log()
log_level = self.handler.get_last_log_level()
self.assertEqual(log, message)
self.assertEqual(log_level, logging.DEBUG)
def test_standard_error(self):
message = 'Test string'
sys.stderr.write(message)
log_level = self.handler.get_last_log_level()
log = self.handler.get_last_log()
self.assertEqual(log, message)
self.assertEqual(log_level, logging.ERROR)
if __name__ == "__main__":
unittest.main(verbosity=2)
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