1 files changed, 32 insertions, 0 deletions
diff --git a/tests/test_signals.py b/tests/test_signals.py
index e6142fb..c6076f9 100644
--- a/tests/test_signals.py
+++ b/tests/test_signals.py
@@ -180,6 +180,38 @@ def test_signal_signals_weak_sender():
     assert len(sentinel) == 1
 
 
+def test_empty_bucket_growth():
+    sentinel = Sentinel()
+    sig = blinker.Signal()
+    senders = lambda: (len(sig._by_sender),
+                       sum(len(i) for i in sig._by_sender.values()))
+    receivers = lambda: (len(sig._by_receiver),
+                         sum(len(i) for i in sig._by_receiver.values()))
+
+    receiver1 = sentinel.make_receiver('receiver1')
+    receiver2 = sentinel.make_receiver('receiver2')
+
+    class Sender(object):
+        """A weakref-able object."""
+
+    sender = Sender()
+    sig.connect(receiver1, sender=sender)
+    sig.connect(receiver2, sender=sender)
+
+    assert senders() == (1, 2)
+    assert receivers() == (2, 2)
+
+    sig.disconnect(receiver1, sender=sender)
+
+    assert senders() == (1, 1)
+    assert receivers() == (2, 1)
+
+    sig.disconnect(receiver2, sender=sender)
+
+    assert senders() == (1, 0)
+    assert receivers() == (2, 0)
+
+
 def test_meta_connect_failure():
     def meta_received(sender, **kw):
         raise TypeError('boom')