Make sure staleness tests errors in _any_ way (#52)

 * Locally it might fail differently, if you have good config, so take care of this
 * But don't be too prescriptive on _what_ failure this is.

tests/integration_test.py

@@ -18,6 +18,7 @@
 
 import pytest
 
+import squeezealexa
 from squeezealexa.squeezebox.server import Server
 from squeezealexa.main import SqueezeAlexa
 from squeezealexa.transport.base import Error as TransportError
@@ -71,9 +72,12 @@ def test_staleness_gets_new_server(self):
         self.alexa.get_server()
         assert self.alexa._server
         self.stub._created_time = time.time() - 100000
+        # Hack that global
+        squeezealexa.main.SERVER_HOSTNAME = "not.there"
         with pytest.raises(TransportError) as e:
             self.alexa.get_server()
-        assert "nothing listening" in str(e)
+        # *Something* will go wrong, as there's no config and/or no server
+        assert str(e)
 
     def test_on_pause_resume(self):
         intent = {}