new_contents: import os
  
  from nose import SkipTest
  
  from kazoo.testing import KazooTestCase
  
  
  class TestBuildEnvironment(KazooTestCase):
  
      def setUp(self):
          KazooTestCase.setUp(self)
          if not os.environ.get('TRAVIS'):
              raise SkipTest('Only run build config tests on Travis.')
  
      def test_gevent_version(self):
          import gevent
          env_version = os.environ.get('GEVENT_VERSION')
          if env_version:
              self.assertEqual(env_version, gevent.__version__)
  
      def test_zookeeper_version(self):
          server_version = self.client.server_version()
          server_version = '.'.join([str(i) for i in server_version])
          env_version = os.environ.get('ZOOKEEPER_VERSION')
          if env_version:
              self.assertEqual(env_version, server_version)
  
subject: add a new test to check we got the correct build environment on travis