feat(application): commands/queries + IChargeableCharConfigService (PRC-001)

tests/SIGCM2.Application.Tests/Pricing/ChargeableChars/GetChargeableCharConfigByIdHandlerTests.cs

@@ -0,0 +1,58 @@
+using FluentAssertions;
+using NSubstitute;
+using SIGCM2.Application.Abstractions.Persistence;
+using SIGCM2.Application.Pricing.ChargeableChars.GetById;
+using SIGCM2.Domain.Pricing.ChargeableChars;
+
+namespace SIGCM2.Application.Tests.Pricing.ChargeableChars;
+
+/// <summary>
+/// PRC-001 — GetChargeableCharConfigByIdQueryHandler tests.
+/// Covers: found → returns DTO, not-found → returns null.
+/// </summary>
+public class GetChargeableCharConfigByIdHandlerTests
+{
+    private readonly IChargeableCharConfigRepository _repo = Substitute.For<IChargeableCharConfigRepository>();
+    private readonly GetChargeableCharConfigByIdQueryHandler _handler;
+
+    private static readonly DateOnly Today = new(2026, 4, 20);
+
+    public GetChargeableCharConfigByIdHandlerTests()
+    {
+        _handler = new GetChargeableCharConfigByIdQueryHandler(_repo);
+    }
+
+    private static ChargeableCharConfig MakeConfig(long id) =>
+        ChargeableCharConfig.Rehydrate(id, null, "$", ChargeableCharCategories.Currency, 1.0m, Today, null, true);
+
+    // ── Found ───────────────────────────────────────────────────────────────────
+
+    [Fact]
+    public async Task Handle_Found_ReturnsDto()
+    {
+        _repo.GetByIdAsync(1L, Arg.Any<CancellationToken>())
+            .Returns(MakeConfig(1L));
+
+        var result = await _handler.Handle(new GetChargeableCharConfigByIdQuery(1L));
+
+        result.Should().NotBeNull();
+        result!.Id.Should().Be(1L);
+        result.Symbol.Should().Be("$");
+        result.PricePerUnit.Should().Be(1.0m);
+        result.ValidFrom.Should().Be(Today);
+        result.IsActive.Should().BeTrue();
+    }
+
+    // ── Not found ───────────────────────────────────────────────────────────────
+
+    [Fact]
+    public async Task Handle_NotFound_ReturnsNull()
+    {
+        _repo.GetByIdAsync(99L, Arg.Any<CancellationToken>())
+            .Returns((ChargeableCharConfig?)null);
+
+        var result = await _handler.Handle(new GetChargeableCharConfigByIdQuery(99L));
+
+        result.Should().BeNull();
+    }
+}