From bc3ce675c1de2beb4da2a8972060ec32cd2d87b2 Mon Sep 17 00:00:00 2001
From: Julian Lobbes <julian.lobbes@octopus.energy>
Date: Mon, 16 Feb 2026 12:28:35 +0000
Subject: [PATCH] Fix NinjaClientBase's request `Mock.body` data type

---
 ninja/testing/client.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ninja/testing/client.py b/ninja/testing/client.py
index 940fc695b..0b8a41880 100644
--- a/ninja/testing/client.py
+++ b/ninja/testing/client.py
@@ -133,7 +133,7 @@ def _build_request(
         request = Mock(spec=HttpRequest)
         request.method = method
         request.path = path
-        request.body = ""
+        request.body = b""
         request.COOKIES = {}
         request._dont_enforce_csrf_checks = True
         request.is_secure.return_value = False