bug#56271: lisp/progmodes/python.el; unmatched quotes cause infinite loop freezing emacs

[Tom Gillespie <tgbugs@gmail.com>]

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Patch to add a test using the evil file as an example.

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From 2c6eb7793b8938d2cce413499a62716a87163a29 Mon Sep 17 00:00:00 2001
From: Tom Gillespie <tgbugs@gmail.com>
Date: Tue, 28 Jun 2022 19:55:31 -0700
Subject: [PATCH] test/lisp/progmodes/python-tests.el: add test for nav end of
 block

Add test for python-nav-end-of-block to prevent regression of bug#56271.
---
 test/lisp/progmodes/python-tests.el | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/test/lisp/progmodes/python-tests.el b/test/lisp/progmodes/python-tests.el
index e17bc0df92..c59a2e7953 100644
--- a/test/lisp/progmodes/python-tests.el
+++ b/test/lisp/progmodes/python-tests.el
@@ -2565,6 +2565,18 @@ python-nav-end-of-block-1
                 (python-tests-look-at "print 'After f(*args)'")
                 (line-end-position))))))
 
+(ert-deftest python-nav-end-of-block-2 ()
+  "Ensure that `python-nav-end-of-block' does not enter an infinite loop."
+  (python-tests-with-temp-buffer
+   "def
+    =''
+ '
+\"\"\"\"\"\"
+ #
+''
+"
+   (python-nav-end-of-block)))
+
 (ert-deftest python-nav-forward-block-1 ()
   "This also accounts as a test for `python-nav-backward-block'."
   (python-tests-with-temp-buffer
-- 
2.35.1