Added a test just to verify that you can encode a document more deeply nested than the Python recursion limit.

1 files changed, 11 insertions, 0 deletions

diff --git a/bs4/tests/test_pageelement.py b/bs4/tests/test_pageelement.py
index a0476e4..d98c577 100644
--- a/bs4/tests/test_pageelement.py
+++ b/bs4/tests/test_pageelement.py
@@ -2,6 +2,7 @@
 import copy
 import pickle
 import pytest
+import sys
 
 from bs4 import BeautifulSoup
 from bs4.element import (
@@ -49,6 +50,16 @@ class TestEncoding(SoupTest):
             encoding="utf8"
         )
 
+    def test_encode_deeply_nested_document(self):
+        # This test verifies that encoding a string doesn't involve
+        # any recursive function calls. If it did, this test would
+        # overflow the Python interpreter stack.
+        limit = sys.getrecursionlimit() + 1
+        markup = "<span>" * limit
+        soup = self.soup(markup)
+        encoded = soup.encode()
+        assert limit == encoded.count(b"<span>")
+
     def test_deprecated_renderContents(self):
         html = "<b>\N{SNOWMAN}</b>"
         soup = self.soup(html)