Refactor replace_most_similar_chunk function and update test cases.

test_utils.py

@@ -4,8 +4,8 @@ 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"
+        part = "This is a sample text"
+        replace = "This is a replaced text."
         expected_output = "This is a replaced text.\nAnother line of text.\nYet another line."
 
         result = replace_most_similar_chunk(whole, part, replace)
@@ -13,12 +13,12 @@ class TestUtils(unittest.TestCase):
 
     def test_replace_most_similar_chunk_not_perfect_match(self):
         whole = "This is a sample text.\nAnother line of text.\nYet another line."
-        part = "sample text.\nAnother line"
-        replace = "replaced text.\nModified line"
+        part = "This was a sample text.\nAnother line of txt"
+        replace = "This is a replaced text.\nModified line of text."
         expected_output = "This is a replaced text.\nModified line of text.\nYet another line."
 
         result = replace_most_similar_chunk(whole, part, replace)
         self.assertEqual(result, expected_output)
 
 if __name__ == "__main__":
-    unittest.main()
+    unittest.main()