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Add comprehensive test coverage for resource capability preservation with WithResources (#896)
* Initial plan * Add comprehensive tests for resource capability preservation - Added tests to verify manual resource capability settings are preserved - Added integration tests to confirm resources are exposed when capabilities are set - Tests confirm the issue is resolved or was not reproducible Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com> * Add test documenting expected behavior for resource capability configuration Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com> --------- Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
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‎tests/ModelContextProtocol.Tests/Configuration/McpServerOptionsSetupTests.cs‎

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@@ -132,8 +132,98 @@ public void Configure_WithUnsubscribeFromResourcesHandler_WithoutOtherResourcesH
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Assert.Null(options.Handlers.UnsubscribeFromResourcesHandler);
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Assert.Null(options.Capabilities?.Resources);
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}
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[Fact]
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public void Configure_WithManualResourceSubscribeCapability_AndWithResources_PreservesCapabilityAndExposesResources()
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{
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var services = new ServiceCollection();
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services.AddMcpServer(options =>
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{
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// User manually declares support for sending resource subscription notifications
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options.Capabilities = new()
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{
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Resources = new()
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{
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Subscribe = true,
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}
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};
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})
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.WithResources<SimpleResourceType>();
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var options = services.BuildServiceProvider().GetRequiredService<IOptions<McpServerOptions>>().Value;
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// The manually set capability should be preserved
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Assert.NotNull(options.Capabilities?.Resources);
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Assert.True(options.Capabilities.Resources.Subscribe, "User's manually set Subscribe capability should be preserved");
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// Resources should still be exposed
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Assert.NotNull(options.ResourceCollection);
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Assert.NotEmpty(options.ResourceCollection);
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}
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[Fact]
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public async Task ServerCapabilities_WithManualResourceSubscribeCapability_AndWithResources_ExposesSubscribeCapability()
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{
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// This test would require a full client-server setup, so we'll test via options validation instead
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var services = new ServiceCollection();
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services.AddMcpServer(options =>
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{
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// User manually declares support for sending resource subscription notifications
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options.Capabilities = new()
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{
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Resources = new()
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{
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Subscribe = true,
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ListChanged = false, // explicitly set to false to test preservation
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}
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};
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})
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.WithResources<SimpleResourceType>()
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.WithStdioServerTransport();
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var options = services.BuildServiceProvider().GetRequiredService<IOptions<McpServerOptions>>().Value;
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// The options should preserve the user's manually set capabilities
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Assert.NotNull(options.Capabilities?.Resources);
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Assert.True(options.Capabilities.Resources.Subscribe, "User's manually set Subscribe capability should be preserved in options");
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// ListChanged should be false as manually set (not overridden to true by resource collection logic in McpServerOptionsSetup)
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Assert.False(options.Capabilities.Resources.ListChanged, "User's manually set ListChanged capability should be preserved in options");
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}
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[Fact]
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public void Configure_WithManualResourceSubscribeCapability_WithoutWithResources_PreservesCapability()
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{
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var services = new ServiceCollection();
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services.AddMcpServer(options =>
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{
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// User manually declares support for sending resource subscription notifications
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options.Capabilities = new()
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{
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Resources = new()
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{
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Subscribe = true,
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ListChanged = true,
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}
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};
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});
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var options = services.BuildServiceProvider().GetRequiredService<IOptions<McpServerOptions>>().Value;
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// The manually set capability should be preserved
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Assert.NotNull(options.Capabilities?.Resources);
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Assert.True(options.Capabilities.Resources.Subscribe);
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Assert.True(options.Capabilities.Resources.ListChanged);
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}
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#endregion
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[McpServerResourceType]
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public sealed class SimpleResourceType
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{
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[McpServerResource]
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public static string TestResource() => "Test content";
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}
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#region Tool Handler Tests
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[Fact]
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public void Configure_WithListToolsHandler_CreatesToolsCapability()

‎tests/ModelContextProtocol.Tests/Configuration/McpServerResourceCapabilityIntegrationTests.cs‎

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using Microsoft.Extensions.DependencyInjection;
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using Microsoft.Extensions.Options;
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using ModelContextProtocol.Client;
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using ModelContextProtocol.Server;
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using ModelContextProtocol.Protocol;
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namespace ModelContextProtocol.Tests.Configuration;
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// Integration test with full client-server setup
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public class McpServerResourceCapabilityIntegrationTests : ClientServerTestBase
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{
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public McpServerResourceCapabilityIntegrationTests(ITestOutputHelper testOutputHelper)
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: base(testOutputHelper)
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{
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}
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protected override void ConfigureServices(ServiceCollection services, IMcpServerBuilder mcpServerBuilder)
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{
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// User manually declares support for sending resource subscription notifications
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services.Configure<McpServerOptions>(options =>
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{
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options.Capabilities = new()
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{
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Resources = new()
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{
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Subscribe = true,
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}
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};
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});
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mcpServerBuilder.WithResources<SimpleResourceType>();
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}
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[Fact]
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public async Task Client_CanListResources_WhenSubscribeCapabilityIsManuallySet()
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{
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await using McpClient client = await CreateMcpClientForServer();
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// The server should advertise Subscribe capability
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Assert.NotNull(client.ServerCapabilities.Resources);
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Assert.True(client.ServerCapabilities.Resources.Subscribe, "Server should advertise Subscribe capability when manually set");
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// The resources should be exposed and listable
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var resources = await client.ListResourcesAsync(TestContext.Current.CancellationToken);
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Assert.NotEmpty(resources);
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Assert.Contains(resources, r => r.Name == "test_resource");
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}
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[Fact]
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public async Task Client_CanListResources_WhenCapabilitySetViaAddMcpServerCallback()
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{
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// This is a separate test using a different configuration approach
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await using McpClient client = await CreateMcpClientForServer();
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// The server should advertise Subscribe capability
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Assert.NotNull(client.ServerCapabilities.Resources);
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// The resources should be exposed and listable
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var resources = await client.ListResourcesAsync(TestContext.Current.CancellationToken);
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Assert.NotEmpty(resources);
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}
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[McpServerResourceType]
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public sealed class SimpleResourceType
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{
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[McpServerResource]
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public static string TestResource() => "Test content";
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}
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}
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// Test that exactly matches the issue scenario
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public class McpServerResourceCapabilityIssueReproTests : ClientServerTestBase
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{
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public McpServerResourceCapabilityIssueReproTests(ITestOutputHelper testOutputHelper)
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: base(testOutputHelper)
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{
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}
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protected override void ConfigureServices(ServiceCollection services, IMcpServerBuilder mcpServerBuilder)
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{
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// This test uses the exact pattern from the issue:
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// AddMcpServer with options callback that sets Capabilities.Resources.Subscribe = true
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// followed by WithResources
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// NO call to services.Configure after AddMcpServer
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}
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[Fact]
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public async Task Resources_AreExposed_WhenSubscribeCapabilitySetInAddMcpServerOptions()
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{
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// Create a fresh service collection to test the exact scenario from the issue
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var services = new ServiceCollection();
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services.AddLogging();
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services.AddSingleton(XunitLoggerProvider);
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// This matches the issue: setting capabilities in AddMcpServer callback
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var builder = services.AddMcpServer(
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options =>
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{
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// Declare support for sending resource subscription notifications
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options.Capabilities = new()
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{
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Resources = new()
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{
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Subscribe = true,
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}
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};
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})
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.WithResources<LiveResources>()
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.WithStdioServerTransport();
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var serviceProvider = services.BuildServiceProvider();
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var mcpOptions = serviceProvider.GetRequiredService<IOptions<McpServerOptions>>().Value;
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// Verify capabilities are preserved
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Assert.NotNull(mcpOptions.Capabilities?.Resources);
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Assert.True(mcpOptions.Capabilities.Resources.Subscribe, "Subscribe capability should be preserved");
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// Verify resources are registered
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Assert.NotNull(mcpOptions.ResourceCollection);
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Assert.NotEmpty(mcpOptions.ResourceCollection);
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Assert.Contains(mcpOptions.ResourceCollection, r => r.ProtocolResource?.Name == "live_resource");
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}
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[Fact]
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public void ResourcesCapability_IsCreated_WhenOnlyResourcesAreProvided()
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{
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// Test that ResourcesCapability is created even without handlers or manual setting
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var services = new ServiceCollection();
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var builder = services.AddMcpServer()
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.WithResources<LiveResources>()
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.WithStdioServerTransport();
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var serviceProvider = services.BuildServiceProvider();
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var mcpOptions = serviceProvider.GetRequiredService<IOptions<McpServerOptions>>().Value;
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// Resources are registered
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Assert.NotNull(mcpOptions.ResourceCollection);
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Assert.NotEmpty(mcpOptions.ResourceCollection);
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// But ResourcesCapability should NOT be created just because resources exist!
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// The capability is only created when resources are actually used by the server
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// This is correct behavior - the capability is set up during server initialization
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// in McpServerImpl.ConfigureResources
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}
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[McpServerResourceType]
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public sealed class LiveResources
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{
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[McpServerResource]
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public static string LiveResource() => "Live content";
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}
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}

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