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-rw-r--r--tests/micropython/heapalloc_str.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/tests/micropython/heapalloc_str.py b/tests/micropython/heapalloc_str.py
index 0df39d3c0c..39aa56ccd7 100644
--- a/tests/micropython/heapalloc_str.py
+++ b/tests/micropython/heapalloc_str.py
@@ -3,6 +3,7 @@ import micropython
micropython.heap_lock()
+# Concatenating empty string returns original string
b"" + b""
b"" + b"1"
b"2" + b""
@@ -11,4 +12,7 @@ b"2" + b""
"" + "1"
"2" + ""
+# If no replacements done, returns original string
+"foo".replace(",", "_")
+
micropython.heap_unlock()