Avoid StdioServerTransport where not required

StdioServerTransport does not reliably close on linux, which causes a
threadpool thread to be blocked on read.  This can lead to threadpool
starvation and application hangs.  Since the tests in question do not
require stdio transport, switch to using StreamServerTransport with null
streams to avoid this issue.

Author: ericstj

tests/ModelContextProtocol.Tests/Configuration/McpServerOptionsSetupTests.cs

@@ -181,9 +181,10 @@ public async Task ServerCapabilities_WithManualResourceSubscribeCapability_AndWi
             };
         })
         .WithResources<SimpleResourceType>()
-        .WithStdioServerTransport();
+        .WithStreamServerTransport(Stream.Null, Stream.Null);
 
-        var options = services.BuildServiceProvider().GetRequiredService<IOptions<McpServerOptions>>().Value;
+        await using var sp = services.BuildServiceProvider();
+        var options = sp.GetRequiredService<IOptions<McpServerOptions>>().Value;
 
         // The options should preserve the user's manually set capabilities
         Assert.NotNull(options.Capabilities?.Resources);

tests/ModelContextProtocol.Tests/Configuration/McpServerResourceCapabilityIntegrationTests.cs

@@ -106,9 +106,9 @@ public async Task Resources_AreExposed_WhenSubscribeCapabilitySetInAddMcpServerO
                 };
             })
             .WithResources<LiveResources>()
-            .WithStdioServerTransport();
+            .WithStreamServerTransport(Stream.Null, Stream.Null);
 
-        var serviceProvider = services.BuildServiceProvider();
+        await using var serviceProvider = services.BuildServiceProvider();
         var mcpOptions = serviceProvider.GetRequiredService<IOptions<McpServerOptions>>().Value;
 
         // Verify capabilities are preserved
@@ -122,15 +122,15 @@ public async Task Resources_AreExposed_WhenSubscribeCapabilitySetInAddMcpServerO
     }
 
     [Fact]
-    public void ResourcesCapability_IsCreated_WhenOnlyResourcesAreProvided()
+    public async Task ResourcesCapability_IsCreated_WhenOnlyResourcesAreProvided()
     {
         // Test that ResourcesCapability is created even without handlers or manual setting
         var services = new ServiceCollection();
         var builder = services.AddMcpServer()
             .WithResources<LiveResources>()
-            .WithStdioServerTransport();
+            .WithStreamServerTransport(Stream.Null, Stream.Null);
 
-        var serviceProvider = services.BuildServiceProvider();
+        await using var serviceProvider = services.BuildServiceProvider();
         var mcpOptions = serviceProvider.GetRequiredService<IOptions<McpServerOptions>>().Value;
 
         // Resources are registered

tests/ModelContextProtocol.Tests/Server/McpServerLoggingLevelTests.cs

@@ -20,7 +20,7 @@ public async Task CanCreateServerWithLoggingLevelHandler()
         var services = new ServiceCollection();
 
         services.AddMcpServer()
-            .WithStdioServerTransport()
+            .WithStreamServerTransport(Stream.Null, Stream.Null)
             .WithSetLoggingLevelHandler(async (ctx, ct) => new EmptyResult());
 
         await using var provider = services.BuildServiceProvider();
@@ -34,7 +34,7 @@ public async Task AddingLoggingLevelHandlerSetsLoggingCapability()
         var services = new ServiceCollection();
 
         services.AddMcpServer()
-            .WithStdioServerTransport()
+            .WithStreamServerTransport(Stream.Null, Stream.Null)
             .WithSetLoggingLevelHandler(async (ctx, ct) => new EmptyResult());
 
         await using var provider = services.BuildServiceProvider();
@@ -50,7 +50,7 @@ public async Task ServerWithoutCallingLoggingLevelHandlerDoesNotSetLoggingCapabi
     {
         var services = new ServiceCollection();
         services.AddMcpServer()
-            .WithStdioServerTransport();
+            .WithStreamServerTransport(Stream.Null, Stream.Null);
         await using var provider = services.BuildServiceProvider();
         var server = provider.GetRequiredService<McpServer>();
         Assert.Null(server.ServerOptions.Capabilities?.Logging);

tests/ModelContextProtocol.Tests/Server/McpServerResourceTests.cs

@@ -34,7 +34,7 @@ public async Task CanCreateServerWithResource()
         var services = new ServiceCollection();
 
         services.AddMcpServer()
-            .WithStdioServerTransport()
+            .WithStreamServerTransport(Stream.Null, Stream.Null)
             .WithListResourcesHandler(async (ctx, ct) =>
             {
                 return new ListResourcesResult
@@ -70,7 +70,7 @@ public async Task CanCreateServerWithResourceTemplates()
         var services = new ServiceCollection();
 
         services.AddMcpServer()
-            .WithStdioServerTransport()
+            .WithStreamServerTransport(Stream.Null, Stream.Null)
             .WithListResourceTemplatesHandler(async (ctx, ct) =>
             {
                 return new ListResourceTemplatesResult
@@ -104,7 +104,7 @@ public async Task CreatingReadHandlerWithNoListHandlerSucceeds()
     {
         var services = new ServiceCollection();
         services.AddMcpServer()
-            .WithStdioServerTransport()
+            .WithStreamServerTransport(Stream.Null, Stream.Null)
             .WithReadResourceHandler(async (ctx, ct) =>
             {
                 return new ReadResourceResult