1 files changed, 39 insertions, 0 deletions
diff --git a/tests/api/test_ratelimiting.py b/tests/api/test_ratelimiting.py
new file mode 100644
index 0000000000..dc2f83c7eb
--- /dev/null
+++ b/tests/api/test_ratelimiting.py
@@ -0,0 +1,39 @@
+from synapse.api.ratelimiting import Ratelimiter
+
+import unittest
+
+class TestRatelimiter(unittest.TestCase):
+
+    def test_allowed(self):
+        limiter = Ratelimiter()
+        allowed, time_allowed = limiter.send_message(
+            user_id="test_id", time_now_s=0, msg_rate_hz=0.1, burst_count=1,
+        )
+        self.assertTrue(allowed)
+        self.assertEquals(10., time_allowed)
+
+        allowed, time_allowed = limiter.send_message(
+            user_id="test_id", time_now_s=5, msg_rate_hz=0.1, burst_count=1,
+        )
+        self.assertFalse(allowed)
+        self.assertEquals(10., time_allowed)
+
+        allowed, time_allowed = limiter.send_message(
+            user_id="test_id", time_now_s=10, msg_rate_hz=0.1, burst_count=1
+        )
+        self.assertTrue(allowed)
+        self.assertEquals(20., time_allowed)
+
+    def test_pruning(self):
+        limiter = Ratelimiter()
+        allowed, time_allowed = limiter.send_message(
+            user_id="test_id_1", time_now_s=0, msg_rate_hz=0.1, burst_count=1,
+        )
+
+        self.assertIn("test_id_1", limiter.message_counts)
+
+        allowed, time_allowed = limiter.send_message(
+            user_id="test_id_2", time_now_s=10, msg_rate_hz=0.1, burst_count=1
+        )
+
+        self.assertNotIn("test_id_1", limiter.message_counts)