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src/Findings/StellaOps.Findings.Ledger.Tests/Services/LedgerEventWriteServiceIncidentTests.cs

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+using System;
+using System.Text.Json.Nodes;
+using System.Threading;
+using System.Threading.Tasks;
+using FluentAssertions;
+using Microsoft.Extensions.Logging.Abstractions;
+using Moq;
+using StellaOps.Findings.Ledger.Domain;
+using StellaOps.Findings.Ledger.Infrastructure;
+using StellaOps.Findings.Ledger.Services;
+using StellaOps.Findings.Ledger.Services.Incident;
+using Xunit;
+
+namespace StellaOps.Findings.Ledger.Tests.Services;
+
+public class LedgerEventWriteServiceIncidentTests
+{
+    [Fact]
+    public async Task AppendAsync_sequence_mismatch_records_conflict_snapshot()
+    {
+        var repo = new Mock<ILedgerEventRepository>();
+        repo.Setup(r => r.GetByEventIdAsync(It.IsAny<string>(), It.IsAny<Guid>(), It.IsAny<CancellationToken>()))
+            .ReturnsAsync((LedgerEventRecord?)null);
+
+        var chainId = Guid.NewGuid();
+        var chainHead = new LedgerEventRecord(
+            "tenant-a",
+            chainId,
+            1,
+            Guid.NewGuid(),
+            LedgerEventConstants.EventFindingCreated,
+            "v1",
+            "finding-1",
+            "artifact-1",
+            null,
+            "actor-1",
+            "operator",
+            DateTimeOffset.UtcNow,
+            DateTimeOffset.UtcNow,
+            new JsonObject(),
+            "hash-prev",
+            LedgerEventConstants.EmptyHash,
+            "leaf-hash",
+            "{}");
+
+        repo.Setup(r => r.GetChainHeadAsync("tenant-a", chainId, It.IsAny<CancellationToken>()))
+            .ReturnsAsync(chainHead);
+
+        var scheduler = new Mock<IMerkleAnchorScheduler>();
+        var diagnostics = new Mock<ILedgerIncidentDiagnostics>();
+
+        var service = new LedgerEventWriteService(
+            repo.Object,
+            scheduler.Object,
+            NullLogger<LedgerEventWriteService>.Instance,
+            diagnostics.Object);
+
+        var draft = new LedgerEventDraft(
+            "tenant-a",
+            chainId,
+            3,
+            Guid.NewGuid(),
+            LedgerEventConstants.EventFindingCreated,
+            "v1",
+            "finding-1",
+            "artifact-1",
+            null,
+            "actor-1",
+            "operator",
+            DateTimeOffset.UtcNow,
+            DateTimeOffset.UtcNow,
+            new JsonObject(),
+            new JsonObject(),
+            null);
+
+        var result = await service.AppendAsync(draft, CancellationToken.None);
+
+        result.Status.Should().Be(LedgerWriteStatus.Conflict);
+        diagnostics.Verify(d => d.RecordConflict(It.Is<ConflictSnapshot>(s => s.Reason == "sequence_mismatch")), Times.Once);
+    }
+}