diff --git a/tests/test_client.py b/tests/test_client.py
index 89d3fd9..eac0be6 100644
--- a/tests/test_client.py
+++ b/tests/test_client.py
@@ -35,6 +35,20 @@ def test_client_reconnect_delay(server, client):
     time.sleep(1.1)
     assert client.connected
 
+@with_client()
+def test_client_reconnect_delay_calculation(server, client):
+    client.RECONNECT_DELAYED = False
+    assert client._reconnect_delay() == 0
+
+    client.RECONNECT_DELAYED = True
+    for expected_delay in client.RECONNECT_DELAYS:
+        delay = client._reconnect_delay()
+        assert delay == expected_delay
+
+        client._reconnect_attempts += 1
+
+    assert client._reconnect_delay() == client.RECONNECT_DELAYS[-1]
+
 @with_client()
 def test_client_disconnect_on_connect(server, client):
     client.disconnect = Mock()