From 03bcc1a41b889450690fa160f23d88484ac0a5c4 Mon Sep 17 00:00:00 2001
From: Erik <erik.nihlen@gmail.com>
Date: Wed, 19 Aug 2026 13:51:07 +0200
Subject: [PATCH] test: serialize AcDream.Core.Net.Tests so real-time transport
 waits are not starved

PausedSelector_SeededDroppedServerReady_RecoversOnIdleSweep failed twice in CI
on the Linux runner, taking 37 s and 42 s, while passing 5/5 in ~350 ms in
isolation on that same machine. The test drives a virtual clock but asserts on
real-time 2 s SpinUntil windows, so full-assembly parallelism on a 6-core
container starves it.

Passing -- xUnit.MaxParallelThreads=2 through dotnet test did not take effect.
A xunit.runner.json is read by xUnit directly and is the convention already
used by AcDream.Core.Tests and AcDream.Launcher.Tests.
---
 .../AcDream.Core.Net.Tests.csproj                     | 11 +++++++++++
 tests/AcDream.Core.Net.Tests/xunit.runner.json        |  6 ++++++
 2 files changed, 17 insertions(+)
 create mode 100644 tests/AcDream.Core.Net.Tests/xunit.runner.json

diff --git a/tests/AcDream.Core.Net.Tests/AcDream.Core.Net.Tests.csproj b/tests/AcDream.Core.Net.Tests/AcDream.Core.Net.Tests.csproj
index a77f941d..dc186f13 100644
--- a/tests/AcDream.Core.Net.Tests/AcDream.Core.Net.Tests.csproj
+++ b/tests/AcDream.Core.Net.Tests/AcDream.Core.Net.Tests.csproj
@@ -22,4 +22,15 @@
     <ProjectReference Include="..\..\src\AcDream.Core.Net\AcDream.Core.Net.csproj" />
   </ItemGroup>
 
+  <ItemGroup>
+    <!-- Several transport tests drive a virtual clock but assert on REAL-time
+         waits (2 s SpinUntil windows). Under default parallelism on a small CI
+         container PausedSelector_SeededDroppedServerReady_RecoversOnIdleSweep
+         took 37-42 s and missed its window, while passing 5/5 in ~350 ms in
+         isolation on the same machine. Serialize the assembly rather than
+         loosen a Campaign N transport assertion. Same settings
+         AcDream.Core.Tests and AcDream.Launcher.Tests already use. -->
+    <None Update="xunit.runner.json" CopyToOutputDirectory="PreserveNewest" />
+  </ItemGroup>
+
 </Project>
diff --git a/tests/AcDream.Core.Net.Tests/xunit.runner.json b/tests/AcDream.Core.Net.Tests/xunit.runner.json
new file mode 100644
index 00000000..c3155894
--- /dev/null
+++ b/tests/AcDream.Core.Net.Tests/xunit.runner.json
@@ -0,0 +1,6 @@
+{
+  "$schema": "https://xunit.net/schema/current/xunit.runner.schema.json",
+  "parallelizeAssembly": false,
+  "parallelizeTestCollections": false,
+  "maxParallelThreads": 1
+}