old_contents: '''
  Run the built-in regression tests with experimental build configurations.
  '''
  
  #  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 os
  import sys
  import requests
  import time
  import subprocess
  import logging
  
  import helpers
  import tsqa.test_cases
  import tsqa.utils
  
  log = logging.getLogger(__name__)
  
  class TestRegressions(helpers.EnvironmentCase):
      '''
      Run the built-in traffic_server regression test suite.
      '''
  
      # NOTE: we need to stop the running Traffic Server in the environment so
      # that we can start up our own. Make sure to restart it when we are done so
      # that the EnvironmentCase doesn't get upset.
  
      @classmethod
      def setUpClass(cls):
          super(TestRegressions, cls).setUpClass()
          cls.environment.stop()
  
      @classmethod
      def tearDownClass(cls):
          cls.environment.start()
          super(TestRegressions, cls).tearDownClass()
  
      def test_regressions(self):
          cmd = [os.path.join(self.environment.layout.bindir, 'traffic_server'), '-R', '1']
          tsqa.utils.run_sync_command(cmd, stdout=sys.stdout, stderr=subprocess.STDOUT)
  
  class TestRegressionsReclaimableFreelist(TestRegressions):
      '''
      Run the built-in traffic_server regression test suite with
      --enable-reclaimable-freelist.
      '''
      environment_factory = {
          'configure': { 'enable-reclaimable-freelist': None },
      }
  
  class TestRegressionsInterimCache(TestRegressions):
      '''
      Run the built-in traffic_server regression test suite with
      --enable-interim-cache.
      '''
      environment_factory = {
          'configure': { 'enable-interim-cache': None },
      }
  
  class TestRegressionsLinuxNativeAIO(TestRegressions):
      '''
      Run the built-in traffic_server regression test suite with
      --enable-linux-native-aio.
      '''
      environment_factory = {
          'configure': { 'enable-linux-native-aio': None },
      }
  
new_contents: '''
  Run the built-in regression tests with experimental build configurations.
  '''
  
  #  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 os
  import sys
  import requests
  import time
  import subprocess
  import logging
  
  import helpers
  import tsqa.test_cases
  import tsqa.utils
  
  log = logging.getLogger(__name__)
  
  class TestRegressions(helpers.EnvironmentCase):
      '''
      Run the built-in traffic_server regression test suite.
      '''
  
      # NOTE: we need to stop the running Traffic Server in the environment so
      # that we can start up our own. Make sure to restart it when we are done so
      # that the EnvironmentCase doesn't get upset.
  
      @classmethod
      def setUpClass(cls):
          super(TestRegressions, cls).setUpClass()
          cls.environment.stop()
  
      @classmethod
      def tearDownClass(cls):
          cls.environment.start()
          super(TestRegressions, cls).tearDownClass()
  
      def test_regressions(self):
          cmd = [os.path.join(self.environment.layout.bindir, 'traffic_server'), '-R', '1']
          tsqa.utils.run_sync_command(cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
  
  class TestRegressionsReclaimableFreelist(TestRegressions):
      '''
      Run the built-in traffic_server regression test suite with
      --enable-reclaimable-freelist.
      '''
      environment_factory = {
          'configure': { 'enable-reclaimable-freelist': None },
      }
  
  class TestRegressionsInterimCache(TestRegressions):
      '''
      Run the built-in traffic_server regression test suite with
      --enable-interim-cache.
      '''
      environment_factory = {
          'configure': { 'enable-interim-cache': None },
      }
  
  class TestRegressionsLinuxNativeAIO(TestRegressions):
      '''
      Run the built-in traffic_server regression test suite with
      --enable-linux-native-aio.
      '''
      environment_factory = {
          'configure': { 'enable-linux-native-aio': None },
      }
  
subject: Fix regression test run, sys.stdout isn't a valid PIPE for subprocess