old_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  #
  # Copyright 2013 Mark Lee
  #
  # Licensed 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.
  
  from __future__ import print_function
  
  from flake8.engine import get_style_guide
  from flake8.main import print_report
  import os
  import sys
  
  if sys.version_info < (2, 7):
      from unittest2 import TestLoader, TextTestRunner
  else:
      from unittest import TestLoader, TextTestRunner
  
  BASE_DIR = os.path.dirname(os.path.abspath(__file__))
  CODE_DIR = os.path.join(BASE_DIR, 'h5bp_jinja')
  
  
  def main():
      # flake8
      flake8 = get_style_guide(exclude=['.tox', 'build'])
      report = flake8.check_files([BASE_DIR])
  
      exit_code = print_report(report, flake8)
      if exit_code > 0:
          sys.exit(exit_code)
  
      # unit tests
      suite = TestLoader().discover(CODE_DIR, top_level_dir=BASE_DIR)
      result = TextTestRunner().run(suite)
      if result.wasSuccessful():
          return 0
      else:
          return 1
  
  if __name__ == '__main__':
      sys.exit(main())
  
new_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  #
  # Copyright 2013, 2014 Mark Lee
  #
  # Licensed 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.
  
  from __future__ import print_function
  
  from flake8.engine import get_style_guide
  from flake8.main import print_report
  import os
  import sys
  
  if sys.version_info < (2, 7):
      from unittest2 import TestLoader, TextTestRunner
  else:
      from unittest import TestLoader, TextTestRunner
  
  BASE_DIR = os.path.dirname(os.path.abspath(__file__))
  CODE_DIR = os.path.join(BASE_DIR, 'h5bp_jinja')
  
  
  def main():
      # flake8
      flake8 = get_style_guide(exclude=['.tox', 'build'])
      report = flake8.check_files([BASE_DIR])
  
      exit_code = print_report(report, flake8)
      if exit_code > 0:
          return exit_code
  
      # unit tests
      suite = TestLoader().discover(CODE_DIR, top_level_dir=BASE_DIR)
      result = TextTestRunner().run(suite)
      if result.wasSuccessful():
          return 0
      else:
          return 1
  
  if __name__ == '__main__':
      sys.exit(main())
  
subject: Test runner: avoid using sys.exit in main()