Create the concept of a cachecounter metric; generating two counters specific to caches

1 files changed, 26 insertions, 1 deletions

diff --git a/tests/metrics/test_metric.py b/tests/metrics/test_metric.py

index a4fd52a9d5..93e8e27e4f 100644
--- a/tests/metrics/test_metric.py
+++ b/tests/metrics/test_metric.py
@@ -15,7 +15,7 @@
 
 from tests import unittest
 
-from synapse.metrics.metric import CounterMetric
+from synapse.metrics.metric import CounterMetric, CacheCounterMetric
 
 
 class CounterMetricTestCase(unittest.TestCase):
@@ -59,3 +59,28 @@ class CounterMetricTestCase(unittest.TestCase):
             "vector{method=GET} 2",
             "vector{method=PUT} 1",
         ])
+
+
+class CacheCounterMetricTestCase(unittest.TestCase):
+
+    def test_cachecounter(self):
+        counter = CacheCounterMetric("cache")
+
+        self.assertEquals(counter.render(), [
+            "cache:hits 0",
+            "cache:misses 0",
+        ])
+
+        counter.inc_misses()
+
+        self.assertEquals(counter.render(), [
+            "cache:hits 0",
+            "cache:misses 1",
+        ])
+
+        counter.inc_hits()
+
+        self.assertEquals(counter.render(), [
+            "cache:hits 1",
+            "cache:misses 1",
+        ])