test(core/browser/platform): 26 extreme RED/GREEN TDD cycles and full regression hardening (3,235 PASS)

tests/Paca.Tests/Browser/BrowserContentAndRoutingExtremeRedTests.cs

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+using System;
+using System.Collections.Generic;
+using Paca.Browser;
+using Paca.Browser.Content;
+using Xunit;
+
+namespace Paca.Tests.Browser;
+
+public class BrowserContentAndRoutingExtremeRedTests
+{
+    // ==========================================
+    // 1. ChromeInternalUrlRouter
+    // ==========================================
+
+    [Theory]
+    [InlineData("chrome://settings?category=privacy", ChromeInternalAction.Settings)]
+    [InlineData("chrome://downloads?q=paca", ChromeInternalAction.Downloads)]
+    [InlineData("chrome://history#search", ChromeInternalAction.History)]
+    [InlineData("chrome:///settings", ChromeInternalAction.Settings)]
+    [InlineData("paca://extensions?id=123", ChromeInternalAction.Extensions)]
+    [InlineData("chrome://settings/content?site=example.com", ChromeInternalAction.SiteSettings)]
+    [InlineData("chrome://clear-browsing-data?time=all", ChromeInternalAction.ClearBrowsingData)]
+    public void ChromeInternalUrlRouter_Route_WithQueryOrFragment_ResolvesActionCorrectly(string url, ChromeInternalAction expected)
+    {
+        var action = ChromeInternalUrlRouter.Route(url);
+        Assert.Equal(expected, action);
+    }
+
+    // ==========================================
+    // 2. DualSubtitleEngine
+    // ==========================================
+
+    [Theory]
+    [InlineData(double.NaN)]
+    [InlineData(double.NegativeInfinity)]
+    [InlineData(double.PositiveInfinity)]
+    [InlineData(-1.0)]
+    public void DualSubtitleEngine_GetDualCues_InvalidTimestamp_ReturnsNull(double timestamp)
+    {
+        var engine = new DualSubtitleEngine();
+        var cues = engine.GetDualCues(timestamp);
+        Assert.Null(cues);
+    }
+
+    [Fact]
+    public void DualSubtitleEngine_RegisterAudioTrack_NullOrDuplicate_HandledSafely()
+    {
+        var engine = new DualSubtitleEngine();
+        engine.RegisterAudioTrack(null!);
+        Assert.Empty(engine.AudioTracks);
+
+        var track1 = new AudioTrackInfo(1, "ko", "한국어", true);
+        var track1Duplicate = new AudioTrackInfo(1, "ko-alt", "한국어 더빙", false);
+
+        engine.RegisterAudioTrack(track1);
+        engine.RegisterAudioTrack(track1Duplicate);
+
+        Assert.Single(engine.AudioTracks);
+        Assert.Equal(1, engine.SelectedAudioTrackId);
+    }
+
+    // ==========================================
+    // 3. LiveCaptionEngine
+    // ==========================================
+
+    [Theory]
+    [InlineData(double.NaN)]
+    [InlineData(-10.0)]
+    public void LiveCaptionEngine_GetActiveCue_InvalidTimestamp_ReturnsNull(double timestamp)
+    {
+        var engine = new LiveCaptionEngine();
+        var cue = engine.GetActiveCue(timestamp);
+        Assert.Null(cue);
+    }
+
+    // ==========================================
+    // 4. MhtmlWebArchivePackager
+    // ==========================================
+
+    [Fact]
+    public void MhtmlWebArchivePackager_Package_NullRequest_ThrowsArgumentNullException()
+    {
+        var packager = new MhtmlWebArchivePackager();
+        Assert.Throws<ArgumentNullException>(() => packager.Package(null!));
+    }
+
+    [Fact]
+    public void MhtmlWebArchivePackager_Package_NullResourcesOrData_PackagesWithoutCrashing()
+    {
+        var packager = new MhtmlWebArchivePackager();
+        var req = new WebArchivePackageRequest(
+            Url: "https://example.com",
+            Title: "Test Page",
+            HtmlContent: "<html><body>Hello</body></html>",
+            Resources: new List<WebArchiveResource>
+            {
+                new("https://example.com/null.png", "image/png", null!),
+                null!
+            }
+        );
+
+        var mhtml = packager.Package(req);
+        Assert.NotNull(mhtml);
+        Assert.Contains("Hello", mhtml);
+    }
+}