diff --git a/tests/micropython/heapalloc_iter.py b/tests/micropython/heapalloc_iter.py
index 3315d78c38..e1ed3daa3b 100644
--- a/tests/micropython/heapalloc_iter.py
+++ b/tests/micropython/heapalloc_iter.py
@@ -25,6 +25,22 @@ fs = frozenset((1,))
 g1 = (100 + x for x in range(2))
 g2 = gen_func()
 
+# test containment (both success and failure) with the heap locked
+heap_lock()
+print(49 in b'123', 255 in b'123')
+print(1 in t, -1 in t)
+print(1 in l, -1 in l)
+print(1 in d, -1 in d)
+print(1 in s, -1 in s)
+heap_unlock()
+
+# test unpacking with the heap locked
+unp0 = unp1 = unp2 = None # preallocate slots for globals
+heap_lock()
+unp0, unp1, unp2 = t
+print(unp0, unp1, unp2)
+heap_unlock()
+
 # test certain builtins with the heap locked
 heap_lock()
 print(all(t))