Some test tweaks.

src/greentest/test___example_servers.py

@@ -9,8 +9,8 @@ from unittest import SkipTest
 import socket
 import ssl
 
+import greentest
 from greentest import DEFAULT_XPC_SOCKET_TIMEOUT
-from greentest import main
 from greentest import util
 from greentest import params
 
@@ -101,6 +101,7 @@ class Test_wsgiserver_ssl(Test_wsgiserver):
         ssl_ctx = ssl._create_unverified_context()
 
 
+@greentest.skipOnLibuvOnCIOnPyPy("Timing issues sometimes lead to a connection refused")
 class Test_webproxy(Test_wsgiserver):
     server = 'webproxy.py'
 
@@ -136,4 +137,4 @@ class Test_webproxy(Test_wsgiserver):
 
 
 if __name__ == '__main__':
-    main()
+    greentest.main()

src/greentest/test__core_timer.py

 from __future__ import print_function
-from gevent import core
+from gevent import config
 
 from greentest import TestCase
 from greentest import main
@@ -13,11 +13,14 @@ class Test(TestCase):
 
     def setUp(self):
         self.called = []
-        self.loop = core.loop(default=True)
+        self.loop = config.loop(default=True)
         self.timer = self.loop.timer(0.001, repeat=self.repeat)
 
     def tearDown(self):
         self.timer.close()
+        self.loop.destroy()
+        self.timer = None
+        self.loop = None
 
     def f(self, x=None):
         self.called.append(1)

src/greentest/test__socket_dns.py

@@ -25,6 +25,7 @@ if getattr(resolver, 'pool', None) is not None:
 
 from greentest.sysinfo import RESOLVER_NOT_SYSTEM
 from greentest.sysinfo import RESOLVER_DNSPYTHON
+from greentest.sysinfo import RESOLVER_ARES
 from greentest.sysinfo import PY2
 
 
@@ -444,6 +445,8 @@ class SanitizedHostsFile(HostsFile):
                 continue
             yield name, addr
 
+@greentest.skipIf(greentest.RUNNING_ON_TRAVIS and RESOLVER_ARES,
+                  "This sometimes randomly fails on Travis with ares, beginning Feb 13, 2018")
 class TestEtcHosts(TestCase):
 
     MAX_HOSTS = os.getenv('GEVENTTEST_MAX_ETC_HOSTS', 10)