#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

import threading
import unittest

from skywalking.utils.counter import AtomicCounter


class TestAtomicCounter(unittest.TestCase):
    def test_counter(self):
        counter = AtomicCounter()

        threads = [threading.Thread(target=lambda: counter.next()) for _ in range(0, 2000)]

        [t.start() for t in threads]

        [t.join() for t in threads]

        self.assertEqual(1999, counter.value)


if __name__ == '__main__':
    unittest.main()