diff --git a/tests/extmod/btree1.py b/tests/extmod/btree1.py
index 75405bc4f0407dc81a555c2b392535a286bf8386..11acd7c98fe9cdfa985b4f19d17c6c1554576a2d 100644
--- a/tests/extmod/btree1.py
+++ b/tests/extmod/btree1.py
@@ -54,3 +54,6 @@ for k, v in db.items(None, None, btree.DESC):
 
 print(list(db.keys()))
 print(list(db.values()))
+
+for k in db:
+    print(k)
diff --git a/tests/extmod/btree1.py.exp b/tests/extmod/btree1.py.exp
index 494eb6a0814923fb05451a72d2a1138be106ecbd..a266d7acfc94a321b5d0836c11fa61c590055421 100644
--- a/tests/extmod/btree1.py.exp
+++ b/tests/extmod/btree1.py.exp
@@ -27,3 +27,6 @@ KeyError
 (b'bar1', b'foo1')
 [b'bar1', b'foo1', b'foo3']
 [b'foo1', b'bar1', b'bar3']
+b'bar1'
+b'foo1'
+b'foo3'