From 0ed8d4e7d1029e1283b04f70d51d2af96ad85d6a Mon Sep 17 00:00:00 2001
From: Baptiste Mispelon <baptiste.mispelon@torchbox.com>
Date: Mon, 12 Jan 2026 14:51:32 +0100
Subject: Fixed #36859 -- Made assertContains and assertNotContains idempotent
 for streaming responses.

---
 django/test/testcases.py | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'django/test/testcases.py')

diff --git a/django/test/testcases.py b/django/test/testcases.py
index 5f83612fe5..de2a3eb61d 100644
--- a/django/test/testcases.py
+++ b/django/test/testcases.py
@@ -575,6 +575,8 @@ class SimpleTestCase(unittest.TestCase):
 
         if response.streaming:
             content = b"".join(response.streaming_content)
+            # Reset the content so it can be checked again (idempotency).
+            response.streaming_content = [content]
         else:
             content = response.content
         response_content = content
-- 
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