Try to get TestApp running happily in the new build configuration

test/TestApp-net9.0/.gitignore

@@ -0,0 +1,2 @@
+FodyWeavers.xml
+FodyWeavers.xsd

test/TestApp-net9.0/Program.cs

@@ -0,0 +1,70 @@
+using System.Reflection;
+using Microsoft.Extensions.Configuration;
+using Serilog;
+using Serilog.Debugging;
+using Serilog.Settings.Configuration;
+
+if (args.Length == 1 && args[0] == "is-single-file")
+{
+    if (typeof(Program).Assembly.GetManifestResourceNames().Any(e => e.StartsWith("costura.")))
+    {
+        Console.WriteLine(true);
+        return 0;
+    }
+    // IL3000: 'System.Reflection.Assembly.Location' always returns an empty string for assemblies embedded in a single-file app
+#pragma warning disable IL3000
+    Console.WriteLine(string.IsNullOrEmpty(Assembly.GetEntryAssembly()?.Location));
+#pragma warning restore
+    return 0;
+}
+
+SelfLog.Enable(Console.Error);
+
+Thread.CurrentThread.Name = "Main thread";
+const string outputTemplate = "({ThreadName}) [{Level}] {Message}{NewLine}";
+
+var configurationValues = new Dictionary<string, string?>();
+var minimumLevelOnly = args.Contains("--minimum-level-only");
+if (minimumLevelOnly)
+{
+    configurationValues["Serilog:MinimumLevel"] = "Verbose";
+}
+else
+{
+    configurationValues["Serilog:Enrich:0"] = "WithThreadName";
+    configurationValues["Serilog:WriteTo:0:Name"] = "Console";
+    configurationValues["Serilog:WriteTo:0:Args:outputTemplate"] = outputTemplate;
+}
+
+if (args.Contains("--using-thread")) configurationValues["Serilog:Using:Thread"] = "Serilog.Enrichers.Thread";
+if (args.Contains("--using-console")) configurationValues["Serilog:Using:Console"] = "Serilog.Sinks.Console";
+
+var assemblies = new List<Assembly>();
+if (args.Contains("--assembly-thread")) assemblies.Add(typeof(ThreadLoggerConfigurationExtensions).Assembly);
+if (args.Contains("--assembly-console")) assemblies.Add(typeof(ConsoleLoggerConfigurationExtensions).Assembly);
+
+try
+{
+    var configuration = new ConfigurationBuilder().AddInMemoryCollection(configurationValues).Build();
+    var options = assemblies.Count > 0 ? new ConfigurationReaderOptions(assemblies.ToArray()) : null;
+    var loggerConfiguration = new LoggerConfiguration().ReadFrom.Configuration(configuration, options);
+    if (minimumLevelOnly)
+    {
+        loggerConfiguration
+            .Enrich.WithThreadName()
+            .WriteTo.Console(outputTemplate: outputTemplate);
+    }
+    var logger = loggerConfiguration.CreateLogger();
+    logger.Information("Expected success");
+    return 0;
+}
+catch (InvalidOperationException exception) when (exception.Message.StartsWith("No Serilog:Using configuration section is defined and no Serilog assemblies were found."))
+{
+    Console.WriteLine("Expected exception");
+    return 0;
+}
+catch (Exception exception)
+{
+    Console.Error.WriteLine(exception);
+    return 1;
+}

test/TestApp-net9.0/TestApp.csproj

@@ -0,0 +1,33 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net48</TargetFramework>
+    <DebugType>embedded</DebugType>
+    <AutoGenerateBindingRedirects>false</AutoGenerateBindingRedirects>
+    <GenerateSupportedRuntime>false</GenerateSupportedRuntime>
+    <PublishReferencesDocumentationFiles>false</PublishReferencesDocumentationFiles>
+    <AllowedReferenceRelatedFileExtensions>none</AllowedReferenceRelatedFileExtensions>
+    <UseCurrentRuntimeIdentifier>true</UseCurrentRuntimeIdentifier>
+    <SelfContained>true</SelfContained>
+    <GenerateDocumentationFile>false</GenerateDocumentationFile>
+    <!-- Ignore vulnerable (framework) packages; this app is not published. -->
+    <NoWarn>NU1902;NU1903</NoWarn>
+  </PropertyGroup>
+
+  <ItemGroup Condition="$(Configuration) == 'Debug'">
+    <ProjectReference Include="..\..\src\Serilog.Settings.Configuration\Serilog.Settings.Configuration.csproj" />
+  </ItemGroup>
+
+  <ItemGroup Condition="$(Configuration) == 'Release'">
+    <PackageReference Include="Serilog.Settings.Configuration" Version="[0.0.0-IntegrationTest.0]" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Costura.Fody" Version="5.7.0" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.Extensions.Configuration" Version="9.0.0" />
+    <PackageReference Include="Serilog.Enrichers.Thread" Version="4.0.0" />
+    <PackageReference Include="Serilog.Sinks.Console" Version="6.0.0" />
+  </ItemGroup>
+
+</Project>

test/TestApp-net9.0/nuget.config

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+  <config>
+    <add key="globalPackagesFolder" value="packages" />
+  </config>
+  <packageSources>
+    <clear />
+    <add key="local" value="." />
+    <add key="nuget" value="https://api.nuget.org/v3/index.json" />
+  </packageSources>
+</configuration>

test/TestApp/TestApp.csproj

@@ -11,6 +11,8 @@
     <UseCurrentRuntimeIdentifier>true</UseCurrentRuntimeIdentifier>
     <SelfContained>true</SelfContained>
     <GenerateDocumentationFile>false</GenerateDocumentationFile>
+    <!-- Ignore vulnerable (framework) packages; this app is not published. -->
+    <NoWarn>NU1902;NU1903</NoWarn>
   </PropertyGroup>
 
   <ItemGroup Condition="$(Configuration) == 'Debug'">
@@ -26,9 +28,6 @@
     <PackageReference Include="Microsoft.Extensions.Configuration" Version="9.0.0" />
     <PackageReference Include="Serilog.Enrichers.Thread" Version="4.0.0" />
     <PackageReference Include="Serilog.Sinks.Console" Version="6.0.0" />
-    <PackageReference Include="System.Net.Http" Version="4.3.4" />
-    <PackageReference Include="System.Private.Uri" Version="4.3.2" />
-    <PackageReference Include="System.Text.RegularExpressions" Version="4.3.1" />
   </ItemGroup>
 
 </Project>