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src/Signals/__Tests/StellaOps.Signals.Tests/SimpleJsonCallgraphParserGateTests.cs

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+using System.IO;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+using FluentAssertions;
+using StellaOps.Signals.Models;
+using StellaOps.Signals.Parsing;
+using Xunit;
+
+namespace StellaOps.Signals.Tests;
+
+public sealed class SimpleJsonCallgraphParserGateTests
+{
+    [Fact]
+    public async Task ParseAsync_parses_gate_fields_on_edges()
+    {
+        var json = """
+        {
+          "schema_version": "1.0",
+          "nodes": [
+            { "id": "main" },
+            { "id": "target" }
+          ],
+          "edges": [
+            {
+              "from": "main",
+              "to": "target",
+              "kind": "call",
+              "gate_multiplier_bps": 3000,
+              "gates": [
+                {
+                  "type": "authRequired",
+                  "detail": "[Authorize] attribute",
+                  "guard_symbol": "main",
+                  "source_file": "/src/app.cs",
+                  "line_number": 42,
+                  "confidence": 0.9,
+                  "detection_method": "pattern"
+                }
+              ]
+            }
+          ]
+        }
+        """;
+
+        var parser = new SimpleJsonCallgraphParser("csharp");
+        await using var stream = new MemoryStream(Encoding.UTF8.GetBytes(json), writable: false);
+        var parsed = await parser.ParseAsync(stream, CancellationToken.None);
+
+        parsed.Edges.Should().ContainSingle();
+        var edge = parsed.Edges[0];
+        edge.GateMultiplierBps.Should().Be(3000);
+        edge.Gates.Should().NotBeNull();
+        edge.Gates!.Should().ContainSingle();
+        edge.Gates[0].Type.Should().Be(CallgraphGateType.AuthRequired);
+        edge.Gates[0].GuardSymbol.Should().Be("main");
+        edge.Gates[0].SourceFile.Should().Be("/src/app.cs");
+        edge.Gates[0].LineNumber.Should().Be(42);
+        edge.Gates[0].DetectionMethod.Should().Be("pattern");
+    }
+}
+