feat(ads/seo/release): v1.2.0 with live Google Ads, isolated ad profile, ads.txt, and SEO/AEO/GEO optimization

tests/Paca.Tests/Core/StreamHighlightClipperGateTests.cs

@@ -0,0 +1,51 @@
+using System;
+using Paca.Mobile.Core;
+using Xunit;
+
+namespace Paca.Tests.Core;
+
+public class StreamHighlightClipperGateTests
+{
+    [Fact]
+    public void Gate281_StreamHighlightClipper_BuildsLosslessCutArgs()
+    {
+        var args = StreamHighlightClipper.BuildFfmpegArgs("input.mp4", "output_clip.mp4", startSec: 10.5, durationSec: 30.0, ClipOutputFormat.Mp4Lossless);
+
+        Assert.Contains("-ss 10.5", args);
+        Assert.Contains("-t 30", args);
+        Assert.Contains("-c copy", args);
+    }
+
+    [Fact]
+    public void Gate282_StreamHighlightClipper_BuildsHighQualityGifArgs()
+    {
+        var args = StreamHighlightClipper.BuildFfmpegArgs("input.mp4", "output.gif", startSec: 5.0, durationSec: 8.0, ClipOutputFormat.AnimatedGif);
+
+        Assert.Contains("-ss 5", args);
+        Assert.Contains("-t 8", args);
+        Assert.Contains("palettegen", args);
+        Assert.Contains("paletteuse", args);
+    }
+
+    [Fact]
+    public void Gate283_StreamHighlightClipper_ValidatesClipBounds()
+    {
+        // Negative start clamped to 0
+        var args = StreamHighlightClipper.BuildFfmpegArgs("input.mp4", "out.mp4", startSec: -5.0, durationSec: 10.0, ClipOutputFormat.Mp4Lossless);
+        Assert.Contains("-ss 0", args);
+
+        // Zero or negative duration throws
+        Assert.Throws<ArgumentOutOfRangeException>(() =>
+            StreamHighlightClipper.BuildFfmpegArgs("input.mp4", "out.mp4", startSec: 10, durationSec: 0, ClipOutputFormat.Mp4Lossless));
+    }
+
+    [Fact]
+    public void Gate284_StreamHighlightClipper_CalculatesOutputName()
+    {
+        var outMp4 = StreamHighlightClipper.GenerateOutputFileName("MyStream.mp4", startSec: 45.0, durationSec: 15.0, ClipOutputFormat.Mp4Lossless);
+        Assert.Equal("MyStream_clip_45s_15s.mp4", outMp4);
+
+        var outGif = StreamHighlightClipper.GenerateOutputFileName("MyStream.mp4", startSec: 120.0, durationSec: 5.0, ClipOutputFormat.AnimatedGif);
+        Assert.Equal("MyStream_clip_120s_5s.gif", outGif);
+    }
+}