diff --git a/src/wormhole_transit_relay/test/common.py b/src/wormhole_transit_relay/test/common.py
index 5bdbcba..9f2e827 100644
--- a/src/wormhole_transit_relay/test/common.py
+++ b/src/wormhole_transit_relay/test/common.py
@@ -4,10 +4,17 @@ from twisted.internet.defer import inlineCallbacks
 from ..transit_server import Transit
 
 class ServerBase:
+    log_requests = False
+
     @inlineCallbacks
     def setUp(self):
         self._lp = None
-        yield self._setup_relay()
+        if self.log_requests:
+            blur_usage = None
+        else:
+            blur_usage = 60.0
+        yield self._setup_relay(blur_usage=blur_usage)
+        self._transit_server._debug_log = self.log_requests
 
     @inlineCallbacks
     def _setup_relay(self, blur_usage=None, log_file=None, usage_db=None):
diff --git a/src/wormhole_transit_relay/test/test_transit_server.py b/src/wormhole_transit_relay/test/test_transit_server.py
index beaec7a..10755ca 100644
--- a/src/wormhole_transit_relay/test/test_transit_server.py
+++ b/src/wormhole_transit_relay/test/test_transit_server.py
@@ -31,7 +31,7 @@ class Accumulator(protocol.Protocol):
             self._wait.errback(RuntimeError("closed"))
         self._disconnect.callback(None)
 
-class Transit(ServerBase, unittest.TestCase):
+class _Transit:
     def test_blur_size(self):
         blur = transit_server.blur_size
         self.failUnlessEqual(blur(0), 0)
@@ -372,3 +372,9 @@ class Transit(ServerBase, unittest.TestCase):
         self.assertEqual(a1.data, exp)
 
         a1.transport.loseConnection()
+
+class TransitWithLogs(_Transit, ServerBase, unittest.TestCase):
+    log_requests = True
+
+class TransitWithoutLogs(_Transit, ServerBase, unittest.TestCase):
+    log_requests = False