diff --git a/tests/metrics/test_metric.py b/tests/metrics/test_metric.py
new file mode 100644
index 0000000000..a4fd52a9d5
--- /dev/null
+++ b/tests/metrics/test_metric.py
@@ -0,0 +1,61 @@
+# -*- coding: utf-8 -*-
+# Copyright 2015 OpenMarket Ltd
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from tests import unittest
+
+from synapse.metrics.metric import CounterMetric
+
+
+class CounterMetricTestCase(unittest.TestCase):
+
+ def test_scalar(self):
+ counter = CounterMetric("scalar")
+
+ self.assertEquals(counter.render(), [
+ "scalar 0",
+ ])
+
+ counter.inc()
+
+ self.assertEquals(counter.render(), [
+ "scalar 1",
+ ])
+
+ counter.inc()
+ counter.inc()
+
+ self.assertEquals(counter.render(), [
+ "scalar 3"
+ ])
+
+ def test_vector(self):
+ counter = CounterMetric("vector", keys=["method"])
+
+ # Empty counter doesn't yet know what values it has
+ self.assertEquals(counter.render(), [])
+
+ counter.inc("GET")
+
+ self.assertEquals(counter.render(), [
+ "vector{method=GET} 1",
+ ])
+
+ counter.inc("GET")
+ counter.inc("PUT")
+
+ self.assertEquals(counter.render(), [
+ "vector{method=GET} 2",
+ "vector{method=PUT} 1",
+ ])
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