1 files changed, 11 insertions, 0 deletions
diff --git a/tests/micropython/heap_lock.py b/tests/micropython/heap_lock.py
index 0f0a70eff..ca3f5806a 100644
--- a/tests/micropython/heap_lock.py
+++ b/tests/micropython/heap_lock.py
@@ -2,13 +2,24 @@
 
 import micropython
 
+l = []
+l2 = list(range(100))
+
 micropython.heap_lock()
 
+# general allocation on the heap
 try:
     print([])
 except MemoryError:
     print('MemoryError')
 
+# expansion of a heap block
+try:
+    l.extend(l2)
+except MemoryError:
+    print('MemoryError')
+
 micropython.heap_unlock()
 
+# check that allocation works after an unlock
 print([])