test(app): add LogoutCommandHandler tests RED

tests/SIGCM2.Application.Tests/Auth/Logout/LogoutCommandHandlerTests.cs

@@ -0,0 +1,39 @@
+using NSubstitute;
+using SIGCM2.Application.Abstractions.Persistence;
+using SIGCM2.Application.Auth.Logout;
+
+namespace SIGCM2.Application.Tests.Auth.Logout;
+
+public class LogoutCommandHandlerTests
+{
+    private readonly IRefreshTokenRepository _refreshRepo = Substitute.For<IRefreshTokenRepository>();
+    private readonly LogoutCommandHandler _handler;
+
+    public LogoutCommandHandlerTests()
+    {
+        _handler = new LogoutCommandHandler(_refreshRepo);
+    }
+
+    [Fact]
+    public async Task Handle_RevokesAllActiveForUser()
+    {
+        _refreshRepo.RevokeAllActiveForUserAsync(42, Arg.Any<DateTime>()).Returns(3);
+
+        var result = await _handler.Handle(new LogoutCommand(42));
+
+        Assert.True(result.Success);
+        Assert.False(string.IsNullOrWhiteSpace(result.Mensaje));
+        await _refreshRepo.Received(1).RevokeAllActiveForUserAsync(42, Arg.Any<DateTime>());
+    }
+
+    [Fact]
+    public async Task Handle_NoActiveTokens_StillReturnsSuccess()
+    {
+        // 0 rows affected = idempotent logout
+        _refreshRepo.RevokeAllActiveForUserAsync(Arg.Any<int>(), Arg.Any<DateTime>()).Returns(0);
+
+        var result = await _handler.Handle(new LogoutCommand(99));
+
+        Assert.True(result.Success);
+    }
+}