Scaffold some AAT stuff

Shogi.AcceptanceTests/TestSetup/AATFixture.cs

@@ -0,0 +1,77 @@
+using Microsoft.Extensions.Configuration;
+using Microsoft.Identity.Client;
+using System.Net.Http.Headers;
+
+namespace Shogi.AcceptanceTests.TestSetup
+{
+	public class AATFixture : IAsyncLifetime, IDisposable
+	{
+		private bool disposedValue;
+		private readonly IConfidentialClientApplication app;
+
+		public AATFixture()
+		{
+			Configuration = new ConfigurationBuilder()
+				.AddJsonFile("appsettings.json")
+				.AddEnvironmentVariables()
+				.AddUserSecrets<AATFixture>()
+				.Build();
+
+			var azure = Configuration.GetSection("Auth");
+			app = ConfidentialClientApplicationBuilder.Create(azure["ClientId"])
+				.WithTenantId(azure["TenantId"])
+				.WithClientSecret(azure["SecretValue"])
+				.Build();
+
+			Service = new HttpClient
+			{
+				BaseAddress = new Uri(Configuration["ServiceUrl"], UriKind.Absolute)
+			};
+		}
+
+		public IConfiguration Configuration { get; private set; }
+
+
+		public HttpClient Service { get; }
+
+		public async Task InitializeAsync()
+		{
+			var authResult = await app
+				.AcquireTokenForClient(Configuration.GetSection("Auth:Scopes").Get<string[]>())
+				.ExecuteAsync();
+
+			authResult.Should().NotBeNull();
+			authResult.AccessToken.Should().NotBeNullOrEmpty();
+
+			Service.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", authResult.AccessToken);
+
+			var response = await Service.GetAsync("Socket/Token");
+			response.IsSuccessStatusCode.Should().BeTrue(because: "AAT client should create an account for tests.");
+		}
+
+		protected virtual void Dispose(bool disposing)
+		{
+			if (!disposedValue)
+			{
+				if (disposing)
+				{
+					Service.Dispose();
+				}
+
+				disposedValue = true;
+			}
+		}
+
+		public Task DisposeAsync()
+		{
+			Dispose(true);
+			return Task.CompletedTask;
+		}
+
+		public void Dispose()
+		{
+			Dispose(disposing: true);
+			GC.SuppressFinalize(this);
+		}
+	}
+}