tests/SIGCM2.Application.Tests/Rubros/GetById/GetRubroByIdQueryHandlerTests.cs

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+using FluentAssertions;
+using Microsoft.Extensions.Time.Testing;
+using NSubstitute;
+using SIGCM2.Application.Abstractions.Persistence;
+using SIGCM2.Application.Rubros.GetById;
+using SIGCM2.Domain.Entities;
+using SIGCM2.Domain.Exceptions;
+
+namespace SIGCM2.Application.Tests.Rubros.GetById;
+
+public class GetRubroByIdQueryHandlerTests
+{
+    private static readonly FakeTimeProvider FakeTime =
+        new(new DateTimeOffset(2026, 4, 18, 12, 0, 0, TimeSpan.Zero));
+
+    private readonly IRubroRepository _repo = Substitute.For<IRubroRepository>();
+
+    private static DateTime UtcNow => FakeTime.GetUtcNow().UtcDateTime;
+
+    private static Rubro MakeRubro(
+        int id,
+        int? parentId = null,
+        bool activo = true,
+        int? tarifarioBaseId = null,
+        DateTime? fechaModificacion = null)
+        => new(id, parentId, $"Rubro{id}", orden: 1, activo, tarifarioBaseId,
+               fechaCreacion: UtcNow, fechaModificacion);
+
+    // ── Handle_RubroExiste_ActivoPorDefecto_RetornaDto ───────────────────────
+
+    [Fact]
+    public async Task Handle_RubroExiste_ActivoPorDefecto_RetornaDto()
+    {
+        var rubro = MakeRubro(id: 5, parentId: 2, tarifarioBaseId: 10);
+        _repo.GetByIdAsync(5, Arg.Any<CancellationToken>()).Returns(rubro);
+
+        var handler = new GetRubroByIdQueryHandler(_repo);
+        var result = await handler.Handle(new GetRubroByIdQuery(Id: 5));
+
+        result.Should().NotBeNull();
+        result.Id.Should().Be(5);
+        result.Nombre.Should().Be("Rubro5");
+        result.ParentId.Should().Be(2);
+        result.Orden.Should().Be(1);
+        result.Activo.Should().BeTrue();
+        result.TarifarioBaseId.Should().Be(10);
+        result.FechaCreacion.Should().Be(UtcNow);
+        result.FechaModificacion.Should().BeNull();
+    }
+
+    // ── Handle_RubroNoExiste_LanzaRubroNotFoundException ────────────────────
+
+    [Fact]
+    public async Task Handle_RubroNoExiste_LanzaRubroNotFoundException()
+    {
+        _repo.GetByIdAsync(99, Arg.Any<CancellationToken>()).Returns((Rubro?)null);
+
+        var handler = new GetRubroByIdQueryHandler(_repo);
+        var act = () => handler.Handle(new GetRubroByIdQuery(Id: 99));
+
+        await act.Should().ThrowAsync<RubroNotFoundException>()
+            .WithMessage("*99*");
+    }
+
+    // ── Handle_RubroNotFoundException_ContienIdCorrecto ─────────────────────
+
+    [Fact]
+    public async Task Handle_RubroNotFoundException_ContieneIdCorrecto()
+    {
+        _repo.GetByIdAsync(42, Arg.Any<CancellationToken>()).Returns((Rubro?)null);
+
+        var handler = new GetRubroByIdQueryHandler(_repo);
+
+        var ex = await Assert.ThrowsAsync<RubroNotFoundException>(
+            () => handler.Handle(new GetRubroByIdQuery(Id: 42)));
+
+        ex.Id.Should().Be(42);
+    }
+
+    // ── Handle_CancellationToken_SePropagaAlRepo ─────────────────────────────
+
+    [Fact]
+    public async Task Handle_CancellationToken_SePropagaAlRepo()
+    {
+        // The handler signature accepts CancellationToken and forwards it to the repo.
+        // We verify the repo is called exactly once with the matching id and any token.
+        _repo.GetByIdAsync(7, Arg.Any<CancellationToken>()).Returns(MakeRubro(7));
+
+        var handler = new GetRubroByIdQueryHandler(_repo);
+        await handler.Handle(new GetRubroByIdQuery(Id: 7));
+
+        await _repo.Received(1).GetByIdAsync(7, Arg.Any<CancellationToken>());
+    }
+
+    // ── Handle_FechaCreacion_SeSerializaComoInstantUTC ───────────────────────
+
+    [Fact]
+    public async Task Handle_FechaCreacion_SeSerializaComoInstantUTC()
+    {
+        var expectedUtc = new DateTime(2026, 1, 15, 8, 30, 0, DateTimeKind.Utc);
+        var rubro = new Rubro(3, null, "RubroUTC", 0, true, null, expectedUtc, null);
+        _repo.GetByIdAsync(3, Arg.Any<CancellationToken>()).Returns(rubro);
+
+        var handler = new GetRubroByIdQueryHandler(_repo);
+        var result = await handler.Handle(new GetRubroByIdQuery(Id: 3));
+
+        result.FechaCreacion.Should().Be(expectedUtc);
+        result.FechaCreacion.Kind.Should().Be(DateTimeKind.Utc);
+    }
+
+    // ── Handle_FechaModificacion_Null_SeRetornaNull ──────────────────────────
+
+    [Fact]
+    public async Task Handle_FechaModificacion_Null_SeRetornaNull()
+    {
+        var rubro = MakeRubro(id: 8, fechaModificacion: null);
+        _repo.GetByIdAsync(8, Arg.Any<CancellationToken>()).Returns(rubro);
+
+        var handler = new GetRubroByIdQueryHandler(_repo);
+        var result = await handler.Handle(new GetRubroByIdQuery(Id: 8));
+
+        result.FechaModificacion.Should().BeNull();
+    }
+
+    // ── Handle_FechaModificacion_ConValor_SeRetornaCorrecto ──────────────────
+
+    [Fact]
+    public async Task Handle_FechaModificacion_ConValor_SeRetornaCorrecto()
+    {
+        var fechaMod = new DateTime(2026, 3, 10, 10, 0, 0, DateTimeKind.Utc);
+        var rubro = MakeRubro(id: 9, fechaModificacion: fechaMod);
+        _repo.GetByIdAsync(9, Arg.Any<CancellationToken>()).Returns(rubro);
+
+        var handler = new GetRubroByIdQueryHandler(_repo);
+        var result = await handler.Handle(new GetRubroByIdQuery(Id: 9));
+
+        result.FechaModificacion.Should().Be(fechaMod);
+    }
+
+    // ── Handle_RubroRaiz_SinParent_RetornaDtoConParentIdNull ─────────────────
+
+    [Fact]
+    public async Task Handle_RubroRaiz_SinParent_RetornaDtoConParentIdNull()
+    {
+        var rubro = MakeRubro(id: 1, parentId: null);
+        _repo.GetByIdAsync(1, Arg.Any<CancellationToken>()).Returns(rubro);
+
+        var handler = new GetRubroByIdQueryHandler(_repo);
+        var result = await handler.Handle(new GetRubroByIdQuery(Id: 1));
+
+        result.ParentId.Should().BeNull();
+    }
+
+    // ── Handle_RubroConTarifarioBaseId_SeRetornaCorrecto ────────────────────
+
+    [Fact]
+    public async Task Handle_RubroConTarifarioBaseId_SeRetornaCorrecto()
+    {
+        var rubro = MakeRubro(id: 11, tarifarioBaseId: 42);
+        _repo.GetByIdAsync(11, Arg.Any<CancellationToken>()).Returns(rubro);
+
+        var handler = new GetRubroByIdQueryHandler(_repo);
+        var result = await handler.Handle(new GetRubroByIdQuery(Id: 11));
+
+        result.TarifarioBaseId.Should().Be(42);
+    }
+}