https://github.com/click-contrib/click-default-group/pull/18
https://github.com/click-contrib/click-default-group/issues/16

From 9415c77d05cf7d16876e7d70a49a41a6189983b4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Robert=20Sch=C3=BCtz?= <dev@schuetz-co.de>
Date: Sun, 20 Jun 2021 16:11:42 +0200
Subject: [PATCH] make tests compatible with click 8

It now outputs "No such option".
--- a/test.py
+++ b/test.py
@@ -30,7 +30,7 @@ def bar():
 
 def test_default_command_with_arguments():
     assert r.invoke(cli, ['--foo', 'foooo']).output == 'foooo\n'
-    assert 'no such option' in r.invoke(cli, ['-x']).output
+    assert 'no such option' in r.invoke(cli, ['-x']).output.lower()
 
 
 def test_group_arguments():