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test/Dotnet.Samples.AspNetCore.WebApi.Tests/Utilities/TestAuthHandler.cs

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+using System.Security.Claims;
+using System.Text.Encodings.Web;
+using Microsoft.AspNetCore.Authentication;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Options;
+
+namespace Dotnet.Samples.AspNetCore.WebApi.Tests.Utilities;
+
+/// <summary>
+/// A test authentication handler that automatically authenticates every request,
+/// bypassing the real authentication scheme. Used in integration tests to exercise
+/// endpoints protected with [Authorize] without requiring a real token.
+/// </summary>
+internal sealed class TestAuthHandler(
+    IOptionsMonitor<AuthenticationSchemeOptions> options,
+    ILoggerFactory logger,
+    UrlEncoder encoder
+) : AuthenticationHandler<AuthenticationSchemeOptions>(options, logger, encoder)
+{
+    public const string SchemeName = "Test";
+
+    protected override Task<AuthenticateResult> HandleAuthenticateAsync()
+    {
+        var claims = new[] { new Claim(ClaimTypes.Name, "TestUser") };
+        var identity = new ClaimsIdentity(claims, SchemeName);
+        var principal = new ClaimsPrincipal(identity);
+        var ticket = new AuthenticationTicket(principal, SchemeName);
+        return Task.FromResult(AuthenticateResult.Success(ticket));
+    }
+}