BasicTestApp did not have h1 "Hello" that we expect on cleanup. Fix it.

Author: ilonatommy

src/Components/test/E2ETest/ServerExecutionTests/CircuitGracefulTerminationTests.cs

@@ -40,7 +40,7 @@ protected override void InitializeAsyncCore()
     {
         Navigate(ServerPathBase);
         Browser.MountTestComponent<GracefulTermination>();
-        Browser.Equal("Graceful Termination", () => Browser.Exists(By.TagName("h1")).Text);
+        Browser.Equal("Graceful Termination", () => Browser.Exists(By.CssSelector("app h1")).Text);
 
         GracefulDisconnectCompletionSource = new TaskCompletionSource(TaskCreationOptions.RunContinuationsAsynchronously);
         Sink = _serverFixture.Host.Services.GetRequiredService<TestSink>();

src/Components/test/testassets/BasicTestApp/Index.razor

@@ -1,6 +1,9 @@
 @using Microsoft.AspNetCore.Components.Rendering
 @using System.Web
 @inject NavigationManager NavigationManager
+
+<h1>Hello</h1>
+
 <div id="test-selector">
     Select test:
     <select id="test-selector-select" @bind=SelectedComponentTypeName>