Use conditional namespace to avoid CS0436 type conflicts

Co-authored-by: eiriktsarpalis <2813363+eiriktsarpalis@users.noreply.github.com>

Author: Copilot

src/ModelContextProtocol.Core/Server/InMemoryMcpTaskStore.cs

@@ -3,7 +3,11 @@
 using System.Diagnostics.CodeAnalysis;
 using System.Text.Json;
 
+#if MCP_TEST_TIME_PROVIDER
+namespace ModelContextProtocol.Tests.Internal;
+#else
 namespace ModelContextProtocol;
+#endif
 
 /// <summary>
 /// Provides an in-memory implementation of <see cref="IMcpTaskStore"/> for development and testing.

tests/ModelContextProtocol.Tests/ModelContextProtocol.Tests.csproj

@@ -10,9 +10,7 @@
     <IsTestProject>true</IsTestProject>
     <RootNamespace>ModelContextProtocol.Tests</RootNamespace>
     <!-- https://github.com/dotnet/sdk/issues/51060 -->
-    <!-- CS0436: InMemoryMcpTaskStore.cs is linked to enable TimeProvider support for testing.
-         This shadows the type from ModelContextProtocol.Core, causing CS0436 at all usage sites. -->
-    <NoWarn>$(NoWarn);NU1903;NU1902;CS0436</NoWarn>
+    <NoWarn>$(NoWarn);NU1903;NU1902</NoWarn>
     <!-- Define for conditional TimeProvider support in InMemoryMcpTaskStore -->
     <DefineConstants>$(DefineConstants);MCP_TEST_TIME_PROVIDER</DefineConstants>
   </PropertyGroup>

tests/ModelContextProtocol.Tests/Server/InMemoryMcpTaskStoreTests.cs

@@ -3,6 +3,7 @@
 using ModelContextProtocol.Server;
 using ModelContextProtocol.Tests.Utils;
 using System.Text.Json;
+using TestInMemoryMcpTaskStore = ModelContextProtocol.Tests.Internal.InMemoryMcpTaskStore;
 
 namespace ModelContextProtocol.Tests.Server;
 
@@ -1038,7 +1039,7 @@ public async Task ListTasksAsync_KeysetPaginationWorksWithIdenticalTimestamps()
     {
         // Arrange - Use a fake time provider to create tasks with identical timestamps
         var fakeTime = new FakeTimeProvider(DateTimeOffset.UtcNow);
-        using var store = new InMemoryMcpTaskStore(
+        using var store = new TestInMemoryMcpTaskStore(
             defaultTtl: null,
             maxTtl: null,
             pollInterval: null,