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

tests/Paca.Tests/Core/ClipboardAndEncoderSecurityExtremeRedTests.cs

@@ -0,0 +1,104 @@
+using System;
+using Paca.Core.Platform;
+using Paca.Core.QuickActions;
+using Xunit;
+
+namespace Paca.Tests.Core;
+
+public class ClipboardAndEncoderSecurityExtremeRedTests
+{
+    private readonly QuickActionClipboardDetector _detector = new();
+
+    [Theory]
+    [InlineData("---")]
+    [InlineData("----")]
+    [InlineData("+++")]
+    [InlineData("***")]
+    [InlineData("///")]
+    [InlineData("+ - * /")]
+    [InlineData("(+)")]
+    [InlineData("====")]
+    public void QuickActionClipboardDetector_NonMathSymbols_DoesNotDetectAsMathExpression(string input)
+    {
+        var result = _detector.DetectIntent(input);
+        Assert.NotEqual(ClipboardIntentType.Expression, result.IntentType);
+    }
+
+    [Theory]
+    [InlineData("12 + 34")]
+    [InlineData("100 / 5")]
+    [InlineData("(3 + 4) * 2")]
+    [InlineData("2 ^ 8")]
+    [InlineData("50 * 1.1")]
+    public void QuickActionClipboardDetector_ValidArithmetic_DetectsAsExpression(string input)
+    {
+        var result = _detector.DetectIntent(input);
+        Assert.Equal(ClipboardIntentType.Expression, result.IntentType);
+    }
+
+    [Theory]
+    [InlineData("https://evil.com/login?ref=youtube.com")]
+    [InlineData("https://phishing.org/index.html?redirect=twitter.com")]
+    [InlineData("https://attacker.site/steal?feed=tiktok.com")]
+    [InlineData("https://notyoutube.com/watch?v=123")]
+    public void QuickActionClipboardDetector_PhishingDomainQuery_DoesNotDetectAsMediaDownload(string input)
+    {
+        var result = _detector.DetectIntent(input);
+        Assert.NotEqual(ClipboardIntentType.MediaDownload, result.IntentType);
+        Assert.Equal(ClipboardIntentType.BrowseUrl, result.IntentType);
+    }
+
+    [Theory]
+    [InlineData("https://www.youtube.com/watch?v=dQw4w9WgXcQ")]
+    [InlineData("https://x.com/user/status/123456")]
+    [InlineData("https://stream.example.com/playlist.m3u8")]
+    [InlineData("https://video.example.com/movie.mp4")]
+    public void QuickActionClipboardDetector_RealMediaUrls_DetectsAsMediaDownload(string input)
+    {
+        var result = _detector.DetectIntent(input);
+        Assert.Equal(ClipboardIntentType.MediaDownload, result.IntentType);
+    }
+
+    private sealed class LocalMockRunner : IProcessRunner
+    {
+        public Task<ProcessResult> RunAsync(ProcessSpec spec, Action<string, string>? onLine, System.Threading.CancellationToken ct) =>
+            Task.FromResult(new ProcessResult(0, "", ""));
+    }
+
+    [Fact]
+    public void HardwareEncoderDetector_NullCapabilities_SafelyFallsBackToSoftwareCodecs()
+    {
+        var detector = new HardwareEncoderDetector(new LocalMockRunner());
+
+        Assert.Equal("libx264", detector.GetBestH264Encoder(null!));
+        Assert.Equal("libx265", detector.GetBestHevcEncoder(null!));
+        Assert.Equal("libsvtav1", detector.GetBestAv1Encoder(null!));
+    }
+
+    [Fact]
+    public void HardwareEncoderDetector_BuildEncodingArgs_NullOrWhitespaceEncoder_DefaultsToLibx264()
+    {
+        var args = HardwareEncoderDetector.BuildEncodingArgs(null!, 23, "fast");
+        Assert.Contains("-c:v", args);
+        Assert.Contains("libx264", args);
+    }
+
+    [Fact]
+    public void HardwareEncoderDetector_BuildEncodingArgs_NullPreset_DefaultsToFast()
+    {
+        var args = HardwareEncoderDetector.BuildEncodingArgs("libx264", 23, null!);
+        Assert.Contains("-preset", args);
+        Assert.Contains("fast", args);
+    }
+
+    [Theory]
+    [InlineData(-10, 0)]
+    [InlineData(100, 63)]
+    public void HardwareEncoderDetector_BuildEncodingArgs_CrfClamping_ClampsBetweenZeroAnd63(int inputCrf, int expectedCrf)
+    {
+        var args = HardwareEncoderDetector.BuildEncodingArgs("libx264", inputCrf, "fast");
+        var crfIdx = Array.IndexOf(args, "-crf");
+        Assert.True(crfIdx >= 0);
+        Assert.Equal(expectedCrf.ToString(), args[crfIdx + 1]);
+    }
+}