feat(tests): Refaktorierung und Erweiterung von AuthClientTests für Verbindungs- und Nachrichtenbehandlung

- Ersetzte das statische Setup für die Client-Erstellung durch eine wiederverwendbare Build-Methode.
- Ein neuer Test `StartAsync_ShouldConnectSuccessfully` wurde hinzugefügt, um den Verbindungsaufbau zu überprüfen.
- Refactored `ReceiveMessage_ShouldCallOnMessageReceived` für die Einrichtung mehrerer Clients (Sender und Empfänger).
- Konsolidierte hartkodierte URL in eine wiederverwendbare Konstante `HubUrl`.

DigitalData.Auth.Tests/Client/AuthClientTests.cs

@@ -7,18 +7,35 @@ namespace DigitalData.Auth.Tests.Client;
 [TestFixture]
 public class AuthClientTests
 {
-    private IAuthClient _client;
+    private static readonly string HubUrl = "https://localhost:7192/auth-hub";
 
-    private readonly static Func<Action<ClientParams>, ServiceProvider> Build = options => new ServiceCollection()
-        .AddAuthHubClient(options)
-        .BuildServiceProvider();
+    private Func<Action<ClientParams>, ServiceProvider> Build;
 
     [SetUp]
-    public async Task Setup()
+    public void Setup()
     {
-        using var provider = Build(opt => opt.Url = "https://localhost:7192");
-        _client = provider.GetRequiredService<IAuthClient>();
-        await _client.StartAsync();
+        Build = options => new ServiceCollection()
+        .AddAuthHubClient(options)
+        .BuildServiceProvider();
+    }
+
+    [Test]
+    public async Task StartAsync_ShouldConnectSuccessfully()
+    {
+        // Arrange
+        using var provider = Build(opt => opt.Url = HubUrl);
+        var client = provider.GetRequiredService<IAuthClient>();
+
+        // Act
+        await client.TryStartAsync();
+
+        // Assert
+        Assert.Multiple(() =>
+        {
+            Assert.That(client.IsConnected, "Connected");
+            Assert.That(!client.IsConnectionFailed, "There is no fail");
+            Assert.That(client.ConnectionError, Is.Null);
+        });
     }
 
     [Test]
@@ -26,18 +43,25 @@ public class AuthClientTests
     {
         // Arrange
         bool wasCalled = false;
-        using var provider = Build(opt =>
+
+        // Sender client
+        using var provider_sender = Build(opt => opt.Url = HubUrl);
+        var sender_client = provider_sender.GetRequiredService<IAuthClient>();
+        await sender_client.TryStartAsync();
+
+        // Receiver client
+        using var provider_receiver = Build(opt =>
         {
-            opt.Url = "https://localhost:7192";
+            opt.Url = HubUrl;
             opt.Events.OnMessageReceived = (user, message, logger) => wasCalled = true;
         });
-        var client = provider.GetRequiredService<IAuthClient>();
+        var client_receiver = provider_receiver.GetRequiredService<IAuthClient>();
 
         string testUser = "TestUser";
         string testMessage = "Hello, World!";
 
         // Act
-        await client.ReceiveMessageAsync(testUser, testMessage);
+        await client_receiver.ReceiveMessageAsync(testUser, testMessage);
 
         // Assert
         Assert.That(wasCalled, Is.True, "OnMessageReceived was not called.");