diff --git a/ihatemoney/tests/budget_test.py b/ihatemoney/tests/budget_test.py
index 0e6642a4..92496341 100644
--- a/ihatemoney/tests/budget_test.py
+++ b/ihatemoney/tests/budget_test.py
@@ -8,12 +8,12 @@ from unittest.mock import MagicMock
 from urllib.parse import parse_qs, urlencode, urlparse, urlunparse
 
 from flask import session
-from markupsafe import Markup
 import pytest
 from werkzeug.security import check_password_hash, generate_password_hash
 
 from ihatemoney import models
 from ihatemoney.currency_convertor import CurrencyConverter
+from ihatemoney.tests.common.help_functions import extract_link
 from ihatemoney.tests.common.ihatemoney_testcase import IhatemoneyTestCase
 from ihatemoney.versioning import LoggingMode
 
@@ -109,10 +109,7 @@ class BudgetTestCase(IhatemoneyTestCase):
         self.login("raclette")
         self.post_project("raclette")
         response = self.client.get("/raclette/invite").data.decode("utf-8")
-        base_index = response.find("share the following link")
-        start = response.find('href="', base_index) + 6
-        end = response.find('">', base_index)
-        link = Markup(response[start:end]).unescape()
+        link = extract_link(response, "share the following link")
 
         self.client.get("/exit")
         response = self.client.get(link)
diff --git a/ihatemoney/tests/common/help_functions.py b/ihatemoney/tests/common/help_functions.py
index e9c4dcd1..5a401059 100644
--- a/ihatemoney/tests/common/help_functions.py
+++ b/ihatemoney/tests/common/help_functions.py
@@ -1,5 +1,16 @@
+from markupsafe import Markup
+
+
 def em_surround(string, regex_escape=False):
     if regex_escape:
         return r'<em class="font-italic">%s<\/em>' % string
     else:
         return '<em class="font-italic">%s</em>' % string
+
+
+def extract_link(data, start_prefix):
+    base_index = data.find(start_prefix)
+    start = data.find('href="', base_index) + 6
+    end = data.find('">', base_index)
+    link = Markup(data[start:end]).unescape()
+    return link