Update test

Author: maraf

src/Components/Endpoints/test/EndpointHtmlRendererTest.cs

@@ -1,6 +1,7 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+using System.Diagnostics;
 using System.Text.Encodings.Web;
 using System.Text.Json;
 using System.Text.RegularExpressions;
@@ -142,25 +143,20 @@ public async Task CanPreload_WebAssembly_ResourceAssets()
         );
 
         // Act
-        var result = await renderer.PrerenderComponentAsync(httpContext, typeof(SimpleComponent), new InteractiveWebAssemblyRenderMode(prerender: false), ParameterView.Empty);
+        var result = await renderer.PrerenderComponentAsync(httpContext, typeof(WebAssemblyPreloadComponent), new InteractiveWebAssemblyRenderMode(prerender: false), ParameterView.Empty);
         await renderer.Dispatcher.InvokeAsync(() => result.WriteTo(writer, HtmlEncoder.Default));
 
         // Assert
-        Assert.Equal(2, httpContext.Response.Headers.Link.Count);
-
-        var firstPreloadLink = httpContext.Response.Headers.Link[0];
-        Assert.Contains("<first.js>", firstPreloadLink);
-        Assert.Contains("rel=preload", firstPreloadLink);
-        Assert.Contains("as=script", firstPreloadLink);
-        Assert.Contains("fetchpriority=high", firstPreloadLink);
-        Assert.Contains("integrity=\"abcd\"", firstPreloadLink);
-
-        var secondPreloadLink = httpContext.Response.Headers.Link[1];
-        Assert.Contains("<second.js>", secondPreloadLink);
-        Assert.Contains("rel=preload", secondPreloadLink);
-        Assert.Contains("as=script", secondPreloadLink);
-        Assert.Contains("fetchpriority=high", secondPreloadLink);
-        Assert.Contains("integrity=\"abcd\"", secondPreloadLink);
+        Debugger.Launch();
+        var output = writer.ToString();
+
+        Assert.Contains("href=\"first.js\"", output);
+        Assert.Contains("href=\"second.js\"", output);
+        Assert.DoesNotContain("nopreload.js", output);
+        Assert.Contains("rel=\"preload\"", output);
+        Assert.Contains("as=\"script\"", output);
+        Assert.Contains("fetchpriority=\"high\"", output);
+        Assert.Contains("integrity=\"abcd\"", output);
     }
 
     [Fact]

src/Components/Endpoints/test/TestComponents/WebAssemblyPreloadComponent.razor

@@ -0,0 +1,3 @@
+<LinkPreload />
+
+<h3>WebAssemblyPreloadComponent</h3>