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src/__Libraries/__Tests/StellaOps.Signals.Tests/SyntheticRuntimeProbeTests.cs

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+using System.Net;
+using System.Net.Http.Json;
+using System.Text.Json;
+using System.Threading.Tasks;
+using StellaOps.Signals.Models;
+using StellaOps.Signals.Tests.TestInfrastructure;
+using Xunit;
+
+namespace StellaOps.Signals.Tests;
+
+public class SyntheticRuntimeProbeTests : IClassFixture<SignalsTestFactory>
+{
+    private readonly SignalsTestFactory factory;
+
+    public SyntheticRuntimeProbeTests(SignalsTestFactory factory)
+    {
+        this.factory = factory;
+    }
+
+    [Fact]
+    public async Task SyntheticProbe_Generates_Runtime_Facts_And_Scoring()
+    {
+        using var client = factory.CreateClient();
+        client.DefaultRequestHeaders.Add("X-Scopes", "signals:write signals:read");
+
+        var callgraphRequest = CallgraphIngestionTests.CreateRequest("java", component: "synthetic-probe", version: "1.0.0");
+        var callgraphRes = await client.PostAsJsonAsync("/signals/callgraphs", callgraphRequest);
+        Assert.Equal(HttpStatusCode.Accepted, callgraphRes.StatusCode);
+        var callgraphBody = await callgraphRes.Content.ReadFromJsonAsync<CallgraphIngestResponse>();
+        Assert.NotNull(callgraphBody);
+
+        var probeRequest = new SyntheticRuntimeProbeRequest
+        {
+            CallgraphId = callgraphBody!.CallgraphId,
+            Subject = new ReachabilitySubject { ScanId = "scan-synthetic-001" },
+            EventCount = 3
+        };
+
+        var probeRes = await client.PostAsJsonAsync("/signals/runtime-facts/synthetic", probeRequest);
+        Assert.Equal(HttpStatusCode.Accepted, probeRes.StatusCode);
+        var ingestBody = await probeRes.Content.ReadFromJsonAsync<RuntimeFactsIngestResponse>();
+        Assert.NotNull(ingestBody);
+        Assert.Equal("scan-synthetic-001", ingestBody!.SubjectKey);
+        Assert.True(ingestBody.RuntimeFactCount > 0);
+
+        var factRes = await client.GetAsync($"/signals/facts/{ingestBody.SubjectKey}");
+        Assert.Equal(HttpStatusCode.OK, factRes.StatusCode);
+        var factJson = await factRes.Content.ReadAsStringAsync();
+        using var doc = JsonDocument.Parse(factJson);
+        Assert.True(doc.RootElement.TryGetProperty("states", out var states));
+        Assert.True(states.GetArrayLength() > 0);
+        Assert.True(doc.RootElement.TryGetProperty("runtimeFacts", out var runtimeFacts));
+        Assert.True(runtimeFacts.GetArrayLength() > 0);
+    }
+}