From fc49652cf8276cb069fa03fb027c942f8c8eac88 Mon Sep 17 00:00:00 2001
From: "Jason R. Coombs" <jaraco@jaraco.com>
Date: Sun, 4 Jul 2021 10:40:53 -0400
Subject: [PATCH] Add test capturing failure. Ref pypa/distutils#44.

---
 setuptools/_distutils/tests/test_filelist.py | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/setuptools/_distutils/tests/test_filelist.py b/setuptools/_distutils/tests/test_filelist.py
index d8e4b39fd23..b56f82e47bc 100644
--- a/setuptools/_distutils/tests/test_filelist.py
+++ b/setuptools/_distutils/tests/test_filelist.py
@@ -331,6 +331,13 @@ def test_non_local_discovery(self):
             expected = [file1]
             self.assertEqual(filelist.findall(temp_dir), expected)
 
+    @os_helper.skip_unless_symlink
+    def test_symlink_loop(self):
+        with os_helper.temp_dir() as temp_dir:
+            link = os.path.join(temp_dir, 'link-to-parent')
+            os.symlink('.', link)
+            filelist.findall(temp_dir)
+
 
 def test_suite():
     return unittest.TestSuite([