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src/Scanner/__Tests/StellaOps.Scanner.WebService.Tests/ScansEndpointsTests.Entropy.cs

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+using System;
+using System.Net;
+using System.Net.Http.Json;
+using System.Threading.Tasks;
+using StellaOps.Scanner.WebService.Contracts;
+using Xunit;
+
+namespace StellaOps.Scanner.WebService.Tests;
+
+public sealed partial class ScansEndpointsTests
+{
+    [Fact]
+    public async Task EntropyEndpoint_AttachesSnapshot_AndSurfacesInStatus()
+    {
+        using var secrets = new TestSurfaceSecretsScope();
+        using var factory = new ScannerApplicationFactory(cfg =>
+        {
+            cfg["scanner:authority:enabled"] = "false";
+            cfg["scanner:authority:allowAnonymousFallback"] = "true";
+        });
+
+        using var client = factory.CreateClient();
+
+        var submitResponse = await client.PostAsJsonAsync("/api/v1/scans", new
+        {
+            image = new { digest = "sha256:image-demo" }
+        });
+        submitResponse.EnsureSuccessStatusCode();
+
+        var submit = await submitResponse.Content.ReadFromJsonAsync<ScanSubmitResponse>();
+        Assert.NotNull(submit);
+
+        var entropyPayload = new EntropyIngestRequest(
+            ImageOpaqueRatio: 0.42,
+            Layers: new[]
+            {
+                new EntropyLayerRequest("sha256:layer-demo", 0.35, 3500, 10_000)
+            });
+
+        var attachResponse = await client.PostAsJsonAsync($"/api/v1/scans/{submit!.ScanId}/entropy", entropyPayload);
+        Assert.Equal(HttpStatusCode.Accepted, attachResponse.StatusCode);
+
+        var status = await client.GetFromJsonAsync<ScanStatusResponse>($"/api/v1/scans/{submit.ScanId}");
+        Assert.NotNull(status);
+        Assert.NotNull(status!.Entropy);
+        Assert.Equal(0.42, status.Entropy!.ImageOpaqueRatio, 3);
+        Assert.Single(status.Entropy!.Layers);
+        var layer = status.Entropy!.Layers[0];
+        Assert.Equal("sha256:layer-demo", layer.LayerDigest);
+        Assert.Equal(0.35, layer.OpaqueRatio, 3);
+        Assert.Equal(3500, layer.OpaqueBytes);
+        Assert.Equal(10_000, layer.TotalBytes);
+    }
+}