Change tests to remove build xunit warning and add OTLP test (#3507)

tests/Aspire.Dashboard.Tests/BrowserSecurityHeadersMiddlewareTests.cs

@@ -1,10 +1,12 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+using Aspire.Dashboard.Authentication.OtlpConnection;
 using Aspire.Dashboard.Model;
 using Microsoft.AspNetCore.Http;
 using Microsoft.Extensions.FileProviders;
 using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Primitives;
 using Xunit;
 
 namespace Aspire.Dashboard.Tests;
@@ -22,7 +24,7 @@ public async Task InvokeAsync_Development_AllowExternalFetch()
         await middleware.InvokeAsync(httpContext);
 
         // Assert
-        Assert.NotEmpty(httpContext.Response.Headers.ContentSecurityPolicy);
+        Assert.NotEqual(StringValues.Empty, httpContext.Response.Headers.ContentSecurityPolicy);
         Assert.DoesNotContain("default-src", httpContext.Response.Headers.ContentSecurityPolicy.ToString());
     }
 
@@ -37,10 +39,29 @@ public async Task InvokeAsync_Production_DenyExternalFetch()
         await middleware.InvokeAsync(httpContext);
 
         // Assert
-        Assert.NotEmpty(httpContext.Response.Headers.ContentSecurityPolicy);
+        Assert.NotEqual(StringValues.Empty, httpContext.Response.Headers.ContentSecurityPolicy);
         Assert.Contains("default-src", httpContext.Response.Headers.ContentSecurityPolicy.ToString());
     }
 
+    [Fact]
+    public async Task InvokeAsync_Otlp_NotAdded()
+    {
+        // Arrange
+        var middleware = CreateMiddleware(environmentName: "Production");
+        var httpContext = new DefaultHttpContext();
+        httpContext.Features.Set<IOtlpConnectionFeature>(new OtlpConnectionFeature());
+
+        // Act
+        await middleware.InvokeAsync(httpContext);
+
+        // Assert
+        Assert.Equal(StringValues.Empty, httpContext.Response.Headers.ContentSecurityPolicy);
+    }
+
+    private sealed class OtlpConnectionFeature : IOtlpConnectionFeature
+    {
+    }
+
     private static BrowserSecurityHeadersMiddleware CreateMiddleware(string environmentName) =>
         new BrowserSecurityHeadersMiddleware(c => Task.CompletedTask, new TestHostEnvironment { EnvironmentName = environmentName });