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Prefab.Tests/Infrastructure/TestAuthenticationStateProvider.cs

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+using System.Security.Claims;
+using Microsoft.AspNetCore.Components.Authorization;
+
+namespace Prefab.Tests.Infrastructure;
+
+/// <summary>
+/// Simplified authentication provider for tests. Returns a configurable principal and works outside Blazor circuits.
+/// </summary>
+public sealed class TestAuthenticationStateProvider : AuthenticationStateProvider
+{
+    private readonly object _sync = new();
+    private ClaimsPrincipal _principal = CreateAnonymous();
+
+    public override Task<AuthenticationState> GetAuthenticationStateAsync()
+    {
+        ClaimsPrincipal principal;
+        lock (_sync)
+        {
+            principal = _principal;
+        }
+
+        return Task.FromResult(new AuthenticationState(principal));
+    }
+
+    public void SetPrincipal(ClaimsPrincipal? principal)
+    {
+        lock (_sync)
+        {
+            _principal = principal ?? CreateAnonymous();
+        }
+
+        NotifyAuthenticationStateChanged(Task.FromResult(new AuthenticationState(_principal)));
+    }
+
+    public void SetAnonymous() => SetPrincipal(null);
+
+    private static ClaimsPrincipal CreateAnonymous() => new(new ClaimsIdentity());
+}