From 4ae6c65bc589807c787be4b31809c15649a468f4 Mon Sep 17 00:00:00 2001
From: Bernardo Meurer Costa <beme@anthropic.com>
Date: Sat, 18 Oct 2025 23:48:54 +0000
Subject: [PATCH] test(tests/nixos/s3-binary-cache-store): verify credential
 caching in concurrent fetches

Add assertion to test_concurrent_fetches to verify that only one
credential provider is created even with 5 concurrent fetches.
---
 tests/nixos/s3-binary-cache-store.nix | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tests/nixos/s3-binary-cache-store.nix b/tests/nixos/s3-binary-cache-store.nix
index d47273196..9a0975eed 100644
--- a/tests/nixos/s3-binary-cache-store.nix
+++ b/tests/nixos/s3-binary-cache-store.nix
@@ -418,6 +418,13 @@ in
                   f"Expected 5 FileTransfer instances for 5 concurrent fetches, got {transfers_created}"
               )
 
+          if providers_created != 1:
+              print("Debug output:")
+              print(output)
+              raise Exception(
+                  f"Expected 1 credential provider for concurrent fetches, got {providers_created}"
+              )
+
       @setup_s3()
       def test_compression_narinfo_gzip(bucket):
           """Test narinfo compression with gzip"""