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src/Scanner/__Tests/StellaOps.Scanner.Reachability.Tests/ReachabilityUnionWriterTests.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text.Json;
+using System.Threading.Tasks;
+using StellaOps.Scanner.Reachability;
+using Xunit;
+
+namespace StellaOps.Scanner.Reachability.Tests;
+
+public class ReachabilityUnionWriterTests
+{
+    [Fact]
+    public async Task WritesDeterministicNdjson()
+    {
+        var writer = new ReachabilityUnionWriter();
+        using var temp = new TempDir();
+
+        var graph = new ReachabilityUnionGraph(
+            Nodes: new[]
+            {
+                new ReachabilityUnionNode("sym:dotnet:B", "dotnet", "method"),
+                new ReachabilityUnionNode("sym:dotnet:A", "dotnet", "method")
+            },
+            Edges: new[]
+            {
+                new ReachabilityUnionEdge("sym:dotnet:A", "sym:dotnet:B", "call")
+            });
+
+        var result = await writer.WriteAsync(graph, temp.Path, "analysis-x");
+
+        var meta = await JsonDocument.ParseAsync(File.OpenRead(result.MetaPath));
+        var files = meta.RootElement.GetProperty("files").EnumerateArray().ToList();
+        Assert.Equal(2, files.Count); // nodes + edges
+
+        // Deterministic order
+        var nodeLines = await File.ReadAllLinesAsync(Path.Combine(temp.Path, "reachability_graphs/analysis-x/nodes.ndjson"));
+        Assert.Contains(nodeLines, l => l.Contains("sym:dotnet:A"));
+    }
+}