diff --git a/requires/development.txt b/requires/development.txt
index e8a3b99..2df164b 100644
--- a/requires/development.txt
+++ b/requires/development.txt
@@ -1,3 +1,3 @@
 -r testing.txt
-coverage>=3.7,<4.1
+coverage==4.5.1
 Sphinx
diff --git a/setup.cfg b/setup.cfg
index d7cd6f9..f768660 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -3,3 +3,11 @@ universal = 1
 [nosetests]
 cover-package = sprockets.mixins.metrics
 cover-branches = 1
+cover-erase = 1
+cover-html = 1
+cover-html-dir = build/coverage
+cover-xml = 1
+match = ((?:^|[\b_.-])(:?[Tt]est|When|should|[Dd]escribe))
+verbosity = 2
+with-coverage = 1
+with-xunit = 1
diff --git a/sprockets/mixins/metrics/statsd.py b/sprockets/mixins/metrics/statsd.py
index 2d3d972..f0e3817 100644
--- a/sprockets/mixins/metrics/statsd.py
+++ b/sprockets/mixins/metrics/statsd.py
@@ -120,6 +120,7 @@ class StatsDCollector(object):
         self._address = (self._host, self._port)
         self._namespace = namespace
         self._prepend_metric_type = prepend_metric_type
+        self._tcp_reconnect_sleep = 5
 
         if protocol == 'tcp':
             self._tcp = True
@@ -145,10 +146,9 @@ class StatsDCollector(object):
     @gen.engine
     def _tcp_on_closed(self):
         """Invoked when the socket is closed."""
-        sleep = 5
         LOGGER.warning('Not connected to statsd, connecting in %s seconds',
-                       sleep)
-        yield gen.sleep(sleep)
+                       self._tcp_reconnect_sleep)
+        yield gen.sleep(self._tcp_reconnect_sleep)
         self._sock = self._tcp_socket()
 
     def _tcp_on_connected(self):
diff --git a/tests.py b/tests.py
index 17c6d4e..2161d9e 100644
--- a/tests.py
+++ b/tests.py
@@ -44,6 +44,22 @@ def assert_between(low, value, high):
             value, low, high))
 
 
+class MisconfiguredStatsdMetricCollectionTests(testing.AsyncHTTPTestCase):
+
+    def get_app(self):
+        self.application = web.Application([
+            web.url('/', examples.statsd.SimpleHandler),
+            web.url('/counters/(.*)/([.0-9]*)', CounterBumper),
+            web.url('/status_code', DefaultStatusCode),
+        ])
+
+    def test_bad_protocol_raises_ValueError(self):
+        with self.assertRaises(ValueError):
+            statsd.StatsDCollector(host='127.0.0.1',
+                                   port=8125,
+                                   protocol='bad_protocol')
+
+
 class TCPStatsdMetricCollectionTests(testing.AsyncHTTPTestCase):
 
     def get_app(self):
@@ -67,6 +83,24 @@ class TCPStatsdMetricCollectionTests(testing.AsyncHTTPTestCase):
                                             'protocol': 'tcp',
                                             'prepend_metric_type': True})
 
+    def test_tcp_reconnect_on_stream_close(self):
+        path_sleep = 'tornado.gen.sleep'
+        path_statsd = self.application.statsd
+        with mock.patch(path_sleep) as gen_sleep, \
+             patch.object(path_statsd, '_tcp_socket') as mock_tcp_socket:
+                f = web.Future()
+                f.set_result(None)
+                gen_sleep.return_value = f
+
+                self.application.statsd._tcp_on_closed()
+                mock_tcp_socket.assert_called_once_with()
+
+    @patch.object(iostream.IOStream, 'write')
+    def test_write_not_executed_when_connection_is_closed(self, mock_write):
+        self.application.statsd._sock.close()
+        self.application.statsd.send('foo', 500, 'c')
+        mock_write.assert_not_called()
+
     @patch.object(iostream.IOStream, 'write')
     def test_expected_counters_data_written(self, mock_sock):
         path = ('foo', 'bar')