diff --git a/tests/jerry/escape-sequences.js b/tests/jerry/escape-sequences.js
index f1fdb3922..6f32b752f 100644
--- a/tests/jerry/escape-sequences.js
+++ b/tests/jerry/escape-sequences.js
@@ -20,10 +20,6 @@ assert ("\'" === "'");
 assert ('\"' === '"');
 assert ("\"" === '"');
 
-//
-// TODO
-//   Extend the test by verifying character codes after String.charCodeAt would be implemented
-//
 assert ((new String ('\\')).length === 1);
 assert ((new String ('\b')).length === 1);
 assert ((new String ('\f')).length === 1);
@@ -32,7 +28,16 @@ assert ((new String ('\r')).length === 1);
 assert ((new String ('\t')).length === 1);
 assert ((new String ('\v')).length === 1);
 
-// 'p' is not SingleEscapeCharacter
+/* verifying character codes */
+assert ((new String ('\\')).charCodeAt (0) === 92);
+assert ((new String ('\b')).charCodeAt (0) === 8);
+assert ((new String ('\f')).charCodeAt (0) === 12);
+assert ((new String ('\n')).charCodeAt (0) === 10);
+assert ((new String ('\r')).charCodeAt (0) === 13);
+assert ((new String ('\t')).charCodeAt (0) === 9);
+assert ((new String ('\v')).charCodeAt (0) === 11);
+
+/* 'p' is not SingleEscapeCharacter */
 assert ('\p' === 'p');
 
 var v\u0061riable = 'valu\u0065';