Initial commit (history squashed)

src/StellaOps.Feedser.Source.Vndr.Chromium.Tests/Chromium/ChromiumMapperTests.cs

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+using System;
+using System.Linq;
+using StellaOps.Feedser.Source.Vndr.Chromium;
+using StellaOps.Feedser.Source.Vndr.Chromium.Internal;
+using Xunit;
+
+namespace StellaOps.Feedser.Source.Vndr.Chromium.Tests;
+
+public sealed class ChromiumMapperTests
+{
+    [Fact]
+    public void Map_DeduplicatesReferencesAndOrdersDeterministically()
+    {
+        var published = new DateTimeOffset(2024, 9, 12, 14, 0, 0, TimeSpan.Zero);
+        var metadata = new ChromiumDocumentMetadata(
+            "post-123",
+            "Stable Channel Update",
+            new Uri("https://chromium.example/stable-update.html"),
+            published,
+            null,
+            "Security fixes");
+
+        var dto = ChromiumDto.From(
+            metadata,
+            new[] { "CVE-2024-0001" },
+            new[] { "windows" },
+            new[] { new ChromiumVersionInfo("windows", "stable", "128.0.6613.88") },
+            new[]
+            {
+                new ChromiumReference("https://chromium.example/ref1", "advisory", "Ref 1"),
+                new ChromiumReference("https://chromium.example/ref1", "advisory", "Ref 1 duplicate"),
+                new ChromiumReference("https://chromium.example/ref2", "patch", "Ref 2"),
+            });
+
+        var (advisory, _) = ChromiumMapper.Map(dto, VndrChromiumConnectorPlugin.SourceName, published);
+
+        var referenceUrls = advisory.References.Select(r => r.Url).ToArray();
+        Assert.Equal(
+            new[]
+            {
+                "https://chromium.example/ref1",
+                "https://chromium.example/ref2",
+                "https://chromium.example/stable-update.html",
+            },
+            referenceUrls);
+    }
+}