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/SubtitleSyncEngineGateTests.cs

@@ -0,0 +1,88 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using Paca.Mobile.Core;
+using Xunit;
+
+namespace Paca.Tests.Core;
+
+public class SubtitleSyncEngineGateTests
+{
+    [Fact]
+    public void Gate261_SubtitleSyncEngine_DetectsSubtitleFiles_InMediaDirectory()
+    {
+        var tempDir = Path.Combine(Path.GetTempPath(), "paca_sub_test_" + Guid.NewGuid());
+        Directory.CreateDirectory(tempDir);
+        try
+        {
+            var videoPath = Path.Combine(tempDir, "video1.mp4");
+            File.WriteAllText(videoPath, "dummy video");
+            File.WriteAllText(Path.Combine(tempDir, "video1.ko.srt"), "1\n00:00:01,000 --> 00:00:04,000\n안녕하세요");
+            File.WriteAllText(Path.Combine(tempDir, "video1.en.vtt"), "WEBVTT\n\n00:00:01.000 --> 00:00:04.000\nHello");
+            File.WriteAllText(Path.Combine(tempDir, "other.srt"), "1\n00:00:01,000 --> 00:00:04,000\nOther");
+
+            var tracks = SubtitleSyncEngine.FindAssociatedSubtitles(videoPath);
+
+            Assert.Equal(2, tracks.Count);
+            Assert.Contains(tracks, t => t.LanguageCode == "ko" && t.Format == "srt");
+            Assert.Contains(tracks, t => t.LanguageCode == "en" && t.Format == "vtt");
+            Assert.DoesNotContain(tracks, t => t.FileName.Contains("other"));
+        }
+        finally
+        {
+            try { Directory.Delete(tempDir, true); } catch { }
+        }
+    }
+
+    [Fact]
+    public void Gate262_SubtitleSyncEngine_ParsesVttAndSrtCues()
+    {
+        var srtContent = @"1
+00:01:10,500 --> 00:01:14,200
+안녕하세요 반갑습니다
+
+2
+00:01:15,000 --> 00:01:18,500
+다음 대사입니다";
+
+        var cues = SubtitleSyncEngine.ParseCues(srtContent, "srt");
+
+        Assert.Equal(2, cues.Count);
+        Assert.Equal(70.5, cues[0].StartSec);
+        Assert.Equal(74.2, cues[0].EndSec);
+        Assert.Equal("안녕하세요 반갑습니다", cues[0].Text);
+    }
+
+    [Fact]
+    public void Gate263_SubtitleSyncEngine_FindsActiveCue_AtCurrentPosition()
+    {
+        var cues = new List<SubtitleCue>
+        {
+            new(10.0, 15.0, "Active Subtitle Text")
+        };
+
+        var active12 = SubtitleSyncEngine.GetActiveCue(cues, currentPosSec: 12.5);
+        Assert.NotNull(active12);
+        Assert.Equal("Active Subtitle Text", active12!.Text);
+
+        var active20 = SubtitleSyncEngine.GetActiveCue(cues, currentPosSec: 20.0);
+        Assert.Null(active20);
+    }
+
+    [Fact]
+    public void Gate264_SubtitleSyncEngine_AppliesTimeOffsetAdjustment()
+    {
+        var cues = new List<SubtitleCue>
+        {
+            new(10.0, 15.0, "Adjusted Subtitle")
+        };
+
+        // Offset +2.0s means original 10.0s now displays at 12.0s to 17.0s
+        var active11 = SubtitleSyncEngine.GetActiveCue(cues, currentPosSec: 11.0, offsetSec: 2.0);
+        Assert.Null(active11); // Not active yet at 11s
+
+        var active13 = SubtitleSyncEngine.GetActiveCue(cues, currentPosSec: 13.0, offsetSec: 2.0);
+        Assert.NotNull(active13);
+        Assert.Equal("Adjusted Subtitle", active13!.Text);
+    }
+}