test(utils): cover hash_code MD5 helper

tests/_utils/test_code.py

@@ -0,0 +1,29 @@
+# Copyright 2026 Marimo. All rights reserved.
+from __future__ import annotations
+
+from marimo._utils.code import hash_code
+
+
+def test_hash_code_deterministic() -> None:
+    assert hash_code("print(1)") == hash_code("print(1)")
+
+
+def test_hash_code_known_md5_hex() -> None:
+    # md5("hello") with usedforsecurity=False
+    assert hash_code("hello") == "5d41402abc4b2a76b9719d911017c592"
+    assert len(hash_code("hello")) == 32
+
+
+def test_hash_code_empty_string() -> None:
+    digest = hash_code("")
+    assert digest == "d41d8cd98f00b204e9800998ecf8427e"
+    assert len(digest) == 32
+
+
+def test_hash_code_distinct_inputs() -> None:
+    assert hash_code("a") != hash_code("b")
+
+
+def test_hash_code_unicode() -> None:
+    assert hash_code("café") == hash_code("café")
+    assert hash_code("café") != hash_code("cafe")