text: from __future__ import absolute_import, unicode_literals
  
  import itertools
  import operator
  
  import pytest
  
  from amqp.platform import _linux_version_to_tuple
  
  
  def reload_module(module):
      try:
          import importlib
          importlib.reload(module)
      except Exception:
          reload(module)  # noqa -- does not exist on Python3
  
  
  def test_struct_argument_type():
      from amqp.exceptions import FrameSyntaxError
      FrameSyntaxError()
  
  
  @pytest.mark.parametrize('s,expected', [
      ('3.13.0-46-generic', (3, 13, 0)),
      ('3.19.43-1-amd64', (3, 19, 43)),
      ('4.4.34+', (4, 4, 34)),
      ('4.4.what', (4, 4, 0)),
      ('4.what.what', (4, 0, 0)),
      ('4.4.0-43-Microsoft', (4, 4, 0)),
  ])
  def test_linux_version_to_tuple(s, expected):
      assert _linux_version_to_tuple(s) == expected
  
  
  def monkeypatch_platform(monkeypatch, sys_platform, platform_release):
      monkeypatch.setattr("sys.platform", sys_platform)
  
      def release():
          return platform_release
  
      monkeypatch.setattr("platform.release", release)
  
  
  def test_tcp_opts_change(monkeypatch):
      monkeypatch_platform(monkeypatch, 'linux', '2.6.36-1-amd64')
  
      import amqp.platform
      reload_module(amqp.platform)
      old_linux = amqp.platform.KNOWN_TCP_OPTS
  
      monkeypatch_platform(monkeypatch, 'linux', '2.6.37-0-41-generic')
      reload_module(amqp.platform)
      new_linux = amqp.platform.KNOWN_TCP_OPTS
  
      monkeypatch_platform(monkeypatch, 'win32', '7')
      reload_module(amqp.platform)
      win = amqp.platform.KNOWN_TCP_OPTS
  
      monkeypatch_platform(monkeypatch, 'linux', '4.4.0-43-Microsoft')
      reload_module(amqp.platform)
      win_bash = amqp.platform.KNOWN_TCP_OPTS
  
      li = [old_linux, new_linux, win, win_bash]
      assert all(operator.ne(*i) for i in itertools.combinations(li, 2))
  
      assert len(win) <= len(win_bash) < len(old_linux) < len(new_linux)
  