diff --git a/README.md b/README.md
index bf4ac2e..2b7f069 100644
--- a/README.md
+++ b/README.md
@@ -4,8 +4,8 @@
 [![codecov](https://codecov.io/github/DeepPSP/sphinx-emoji-favicon/graph/badge.svg?token=XO53nHzvUM)](https://codecov.io/github/DeepPSP/sphinx-emoji-favicon)
 [![pytest](https://github.com/DeepPSP/sphinx-emoji-favicon/actions/workflows/run-pytest.yml/badge.svg)](https://github.com/DeepPSP/sphinx-emoji-favicon/actions/workflows/run-pytest.yml)
 [![license](https://img.shields.io/github/license/DeepPSP/sphinx-emoji-favicon?style=flat-square)](LICENSE)
-![GitHub Release Date - Published_At](https://img.shields.io/github/release-date/DeepPSP/sphinx-emoji-favicon)
 [![downloads](https://img.shields.io/pypi/dm/sphinx-emoji-favicon?style=flat-square)](https://pypistats.org/packages/sphinx-emoji-favicon)
+![GitHub Release Date - Published_At](https://img.shields.io/github/release-date/DeepPSP/sphinx-emoji-favicon)
 ![GitHub commits since latest release (by SemVer including pre-releases)](https://img.shields.io/github/commits-since/DeepPSP/sphinx-emoji-favicon/latest)
 
 A simple sphinx extension to add emoji favicon to your sphinx site.
diff --git a/requirements.txt b/requirements.txt
index f107711..a89435c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
 sphinx
 docutils
+requests
 emoji
diff --git a/test/test_parser.py b/test/test_parser.py
index 4298c54..91c101c 100644
--- a/test/test_parser.py
+++ b/test/test_parser.py
@@ -4,7 +4,13 @@
 from emoji import EMOJI_DATA, LANGUAGES
 from tqdm.auto import tqdm
 
-from sphinx_emoji_favicon import _defalut_twemoji_latest_version, _str2emoji, _url_is_reachable, create_emoji_favicon_meta
+from sphinx_emoji_favicon import (
+    _defalut_twemoji_latest_version,
+    _str2emoji,
+    _to_code_point,
+    _url_is_reachable,
+    create_emoji_favicon_meta,
+)
 
 
 def test_create_emoji_favicon_meta():
@@ -37,3 +43,8 @@ def test_create_emoji_favicon_meta():
             if emoji_alias in _str2emoji:
                 continue
             assert create_emoji_favicon_meta(emoji_alias) == emoji_favicon_meta
+
+
+def test_to_code_point():
+    for emoji_unicode, emoji_data in tqdm(EMOJI_DATA.items(), total=len(EMOJI_DATA)):
+        assert re.match("^[0-9a-f\\-]+$", _to_code_point(emoji_unicode))