diff --git a/test_utils.py b/test_utils.py
new file mode 100644
index 000000000..66b0facdf
--- /dev/null
+++ b/test_utils.py
@@ -0,0 +1,15 @@
+import unittest
+from utils import replace_most_similar_chunk
+
+class TestUtils(unittest.TestCase):
+    def test_replace_most_similar_chunk(self):
+        whole = "This is a sample text.\nAnother line of text.\nYet another line."
+        part = "sample text"
+        replace = "replaced text"
+        expected_output = "This is a replaced text.\nAnother line of text.\nYet another line."
+
+        result = replace_most_similar_chunk(whole, part, replace)
+        self.assertEqual(result, expected_output)
+
+if __name__ == "__main__":
+    unittest.main()