Add test

src/Http/Http.Extensions/test/HttpMetricsEndpointConventionBuilderExtensionsTests.cs

@@ -0,0 +1,29 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Http.Metadata;
+
+namespace Microsoft.AspNetCore.Http.Extensions.Tests;
+
+public partial class HttpMetricsEndpointConventionBuilderExtensionsTests
+{
+    [Fact]
+    public void DisableHttpMetrics_AddsMetadata()
+    {
+        var builder = new TestEndointConventionBuilder();
+        builder.DisableHttpMetrics();
+
+        Assert.IsAssignableFrom<IDisableHttpMetricsMetadata>(Assert.Single(builder.Metadata));
+    }
+
+    private sealed class TestEndointConventionBuilder : EndpointBuilder, IEndpointConventionBuilder
+    {
+        public void Add(Action<EndpointBuilder> convention)
+        {
+            convention(this);
+        }
+
+        public override Endpoint Build() => throw new NotImplementedException();
+    }
+}