add test__ares_host_result.py with test for issue 104

greentest/test__ares_host_result.py

+import pickle
+import unittest
+from gevent.ares import ares_host_result
+
+
+class TestPickle(unittest.TestCase):
+    # Issue 104: ares.ares_host_result unpickleable
+
+    def _test(self, protocol):
+        r = ares_host_result('family', ('arg1', 'arg2', ))
+        dumped = pickle.dumps(r, protocol)
+        loaded = pickle.loads(dumped)
+        assert r == loaded, (r, loaded)
+        assert r.family == loaded.family, (r, loaded)
+
+    def test0(self):
+        return self._test(0)
+
+    def test1(self):
+        return self._test(1)
+
+    def test2(self):
+        return self._test(2)
+
+
+if __name__ == '__main__':
+    unittest.main()