diff --git a/tests/test_persistence.py b/tests/test_persistence.py
index 9d0a83d..88e5431 100644
--- a/tests/test_persistence.py
+++ b/tests/test_persistence.py
@@ -1,4 +1,6 @@
-from untitled import content, model, persistence
+import time
+
+from untitled import content, model, persistence, rules
 
 
 def test_save_load_roundtrip(tmp_path):
@@ -45,6 +47,25 @@ def test_migration(tmp_path):
     assert loaded.cat.last_updated
 
 
+def test_decay_and_feed():
+    cat = model.Save(
+        version=content.SAVE_VERSION,
+        cat=model.Cat(
+            "Fry",
+            {
+                "size": "tiny",
+                "color": "tuxedo",
+                "eyes": "blue",
+                "personality": "judges you silently",
+            },
+        ),
+    )
+    rules.reconcile(cat.cat, time.time() + 3600)
+    assert cat.cat.fullness < 98
+    rules.feed(cat.cat)
+    assert cat.cat.fullness > 98 and cat.cat.fullness <= 100
+
+
 def test_list_saves(tmp_path):
     open(tmp_path / "test.kitten", "w").close()
     open(tmp_path / "test2.kitten", "w").close()
diff --git a/untitled/rules.py b/untitled/rules.py
index 5e0890d..fbb97bd 100644
--- a/untitled/rules.py
+++ b/untitled/rules.py
@@ -30,4 +30,4 @@ def reconcile(cat, now):
 def feed(cat, amount=100):
     cat.fullness += amount
     if cat.fullness > 100:
-        cat.fullnesss = 100
+        cat.fullness = 100