tests: setup initial infra for end to end tests

test/Blog.Tests/EndToEnd/BlogHostFactory.cs

@@ -0,0 +1,15 @@
+namespace Blog.Tests.EndToEnd;
+
+public class BlogHostFactory<TProgram> : WebApplicationFactory<TProgram> where TProgram : class
+{
+  protected override IHost CreateHost(IHostBuilder builder)
+  {
+    var testHost = base.CreateHost(builder);
+    builder.ConfigureWebHost(webHostBuilder => webHostBuilder.UseKestrel());
+    
+    var kestrelHost = builder.Build();
+    kestrelHost.Start();
+    
+    return new CompositeHost(testHost, kestrelHost);
+  }
+}

test/Blog.Tests/EndToEnd/BlogPageTest.cs

@@ -0,0 +1,19 @@
+namespace Blog.Tests.EndToEnd;
+
+public class BlogPageTest : PageTest
+{
+  private readonly BlogHostFactory<Program> _factory = new();
+
+  public override BrowserNewContextOptions ContextOptions()
+  {
+    var baseUrl = "http://localhost:5000";
+
+    _factory
+      .WithWebHostBuilder(builder => builder.UseUrls(baseUrl))
+      .CreateDefaultClient();
+
+    var options = base.ContextOptions();
+    options.BaseURL = baseUrl;
+    return options;
+  }
+}

test/Blog.Tests/EndToEnd/CompositeHost.cs

@@ -0,0 +1,28 @@
+namespace Blog.Tests.EndToEnd;
+
+public class CompositeHost(IHost testHost, IHost kestrelHost) : IHost
+{
+  private readonly IHost _testHost = testHost;
+  private readonly IHost _kestrelHost = kestrelHost;
+
+  public IServiceProvider Services => _testHost.Services;
+  
+  public void Dispose()
+  {
+    _testHost.Dispose();
+    _kestrelHost.Dispose();
+    GC.SuppressFinalize(this);
+  }
+  
+  public async Task StartAsync(CancellationToken cancellationToken = default)
+  {
+    await _testHost.StartAsync(cancellationToken);
+    await _kestrelHost.StartAsync(cancellationToken);
+  }
+  
+  public async Task StopAsync(CancellationToken cancellationToken = default)
+  {
+    await _testHost.StopAsync(cancellationToken);
+    await _kestrelHost.StopAsync(cancellationToken);
+  }
+}

test/Blog.Tests/EndToEnd/IndexTests.cs

@@ -0,0 +1,13 @@
+namespace Blog.Tests.EndToEnd;
+
+[TestFixture]
+public class IndexTests : BlogPageTest
+{
+  [Test]
+  public async Task Index_WhenNavigatedTo_ItShouldDisplayMessage()
+  {
+    await Page.GotoAsync("/");
+    var message = Page.GetByRole(AriaRole.Heading, new () { Name = "Hello, world!" });
+    await Expect(message).ToBeVisibleAsync();
+  }
+}