new_contents: #!/usr/bin/env python
  #
  # Copyright (c) 2011 VMware, Inc.
  #
  # 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.
  #
  
  import unittest
  import os
  import sys
  
  #prepend PYTHONPATH to find sigar in build/
  from distutils.util import get_platform
  from distutils.sysconfig import get_python_version
  sys.path.insert(0, os.path.abspath(os.path.dirname(__file__)) + \
                                     "/../build/lib." + get_platform() + "-" + get_python_version())
  
  import sigar
  
  class SigarTest(unittest.TestCase):
  
      def setUp(self):
          self.sigar = sigar.open()
  
      def tearDown(self):
          self.sigar.close()
          self.sigar = None
  
      def is_type(self, obj, cls):
          return obj.__class__.__name__ == cls
  
      def testCpuList(self):
          retval = self.sigar.cpu_list()
          self.assertTrue(isinstance(retval, tuple))
          for cpu in retval:
              self.assertTrue(self.is_type(cpu, "Cpu"))
  
      def testCpuInfoList(self):
          retval = self.sigar.cpu_info_list()
          self.assertTrue(isinstance(retval, tuple))
          for cpu in retval:
              self.assertTrue(self.is_type(cpu, "CpuInfo"))
  
      def testWhoList(self):
          retval = self.sigar.who_list()
          self.assertTrue(isinstance(retval, tuple))
          for who in retval:
              self.assertTrue(self.is_type(who, "Who"))
  
      def testNetRouteList(self):
          retval = self.sigar.net_connection_list(0)
          self.assertTrue(isinstance(retval, tuple))
          for conn in retval:
              self.assertTrue(self.is_type(conn, "NetConnection"))
  
      def testNetStat(self):
          retval = self.sigar.net_stat(0)
          self.assertTrue(self.is_type(retval, "NetStat"))
  
      def testNetRoute(self):
          retval = self.sigar.net_route_list()
          self.assertTrue(isinstance(retval, tuple))
          for route in retval:
              self.assertTrue(self.is_type(route, "NetRoute"))
  
      def testProcArgs(self):
          retval = self.sigar.proc_args(os.getpid())
          self.assertTrue(isinstance(retval, tuple))
          self.assertTrue(retval > 1)
          for arg in retval:
              self.assertTrue(isinstance(arg, str))
  
          self.assertEquals(retval, self.sigar.proc_args(str(os.getpid())))
  
          self.assertEquals(retval, self.sigar.proc_args("$$"))
  
          retval = self.sigar.proc_args("Pid.Pid.eq=" + str(os.getpid()))
          self.assertTrue(isinstance(retval, tuple))
  
      def testProcEnv(self):
          retval = self.sigar.proc_env(os.getpid())
          for k, v in os.environ.items():
              self.assertEquals(v, retval[k])
          for pid in self.sigar.proc_list("State.Name.eq=python"):
              self.sigar.proc_env(pid)
  
      def testProcList(self):
          retval = self.sigar.proc_list()
          self.assertTrue(isinstance(retval, tuple))
          self.assertTrue(len(retval) > 1)
          self.assertTrue(os.getpid() in retval)
          self.assertTrue(os.getpid() in self.sigar.proc_list("State.Name.eq=python"))
          self.assertTrue(os.getpid() in self.sigar.proc_list("State.Name.re=.*ython"))
          self.assertFalse(os.getpid() in self.sigar.proc_list("State.Name.eq=ruby"))
          try:
              self.sigar.proc_list("Invalid.Query.xe=.*ython")
              self.assertTrue(False)
          except ValueError:
              self.assertTrue(True)
  
      def testPtql(self):
          try:
              self.sigar.proc_args("Invalid.Query.xe=.*ython")
              self.assertTrue(False)
          except ValueError:
              self.assertTrue(True)
  
      def testConstants(self):
          self.assertEquals(sigar.IFF_UP, 0x1)
          self.assertTrue(len(sigar.VERSION) >= 7)
  
  if __name__ == '__main__':
      unittest.main()
  
subject: add unit tests