test(adm-009): IngresosBrutos handler tests mirror (Red)

tests/SIGCM2.Application.Tests/IngresosBrutos/GetHistorial/GetHistorialIngresosBrutosQueryHandlerTests.cs

@@ -0,0 +1,57 @@
+using NSubstitute;
+using SIGCM2.Application.Abstractions.Persistence;
+using SIGCM2.Application.IngresosBrutos.GetHistorial;
+using SIGCM2.Domain.Fiscal;
+using IibbEntity = SIGCM2.Domain.Entities.IngresosBrutos;
+
+namespace SIGCM2.Application.Tests.IngresosBrutos.GetHistorial;
+
+public class GetHistorialIngresosBrutosQueryHandlerTests
+{
+    private readonly IIngresosBrutosRepository _repo = Substitute.For<IIngresosBrutosRepository>();
+    private readonly GetHistorialIngresosBrutosQueryHandler _handler;
+
+    public GetHistorialIngresosBrutosQueryHandlerTests()
+    {
+        _handler = new GetHistorialIngresosBrutosQueryHandler(_repo);
+    }
+
+    private static IibbEntity MakeEntity(int id, int? predecesorId, DateOnly desde) =>
+        IibbEntity.FromDb(
+            id: id, provincia: ProvinciaArgentina.BuenosAires,
+            descripcion: "IIBB BA", alicuota: 3m, activo: true,
+            vigenciaDesde: desde,
+            vigenciaHasta: predecesorId.HasValue ? desde.AddYears(1).AddDays(-1) : null,
+            predecesorId: predecesorId,
+            fechaCreacion: DateTime.UtcNow, fechaModificacion: null);
+
+    [Fact]
+    public async Task Handle_ChainOf2_ReturnsListWith2ItemsInOrder()
+    {
+        var chain = new List<IibbEntity>
+        {
+            MakeEntity(1, null, new DateOnly(2023, 1, 1)),
+            MakeEntity(2, 1,   new DateOnly(2024, 1, 1)),
+        };
+        _repo.GetHistorialAsync(2, Arg.Any<CancellationToken>()).Returns(chain);
+
+        var result = await _handler.Handle(new GetHistorialIngresosBrutosQuery(2));
+
+        Assert.Equal(2, result.Count);
+        Assert.Equal(1, result[0].Version);
+        Assert.Equal(2, result[1].Version);
+    }
+
+    [Fact]
+    public async Task Handle_SingleVersion_Returns1Item()
+    {
+        var chain = new List<IibbEntity>
+            { MakeEntity(1, null, new DateOnly(2024, 1, 1)) };
+        _repo.GetHistorialAsync(1, Arg.Any<CancellationToken>()).Returns(chain);
+
+        var result = await _handler.Handle(new GetHistorialIngresosBrutosQuery(1));
+
+        Assert.Single(result);
+        Assert.Equal(ProvinciaArgentina.BuenosAires, result[0].Provincia);
+    }
+}