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

tests/Paca.Tests/App/AppDebugScreenshotServiceTests.cs

@@ -0,0 +1,82 @@
+using System;
+using System.IO;
+using System.Threading;
+using System.Windows;
+using Paca.App.Core;
+using Paca.App.Services;
+using Paca.Tests.Infrastructure;
+using Xunit;
+
+namespace Paca.Tests.App;
+
+public class AppDebugScreenshotServiceTests
+{
+    [Fact]
+    public void AppDebugScreenshotService_GetDefaultScreenshotPath_ReturnsValidPngPath()
+    {
+        var path = AppDebugScreenshotService.GetDefaultScreenshotPath();
+        Assert.False(string.IsNullOrWhiteSpace(path));
+        Assert.EndsWith(".png", path, StringComparison.OrdinalIgnoreCase);
+        Assert.Contains(AppPaths.DataDir, path, StringComparison.OrdinalIgnoreCase);
+    }
+
+    [Fact]
+    public void AppDebugScreenshotService_CaptureWindow_STA_GeneratesValidPngFile()
+    {
+        using var sta = StaDispatcher.Start();
+        WpfTestApp.Ensure(sta.Dispatcher);
+
+        var tempOut = Path.Combine(Path.GetTempPath(), $"paca_test_shot_{Guid.NewGuid():N}.png");
+        try
+        {
+            var result = sta.Invoke(() =>
+            {
+                var window = new Window
+                {
+                    Width = 300,
+                    Height = 200,
+                    Title = "TestCaptureWindow"
+                };
+                window.Show();
+
+                var ok = AppDebugScreenshotService.CaptureWindow(window, tempOut);
+                window.Close();
+                return ok;
+            });
+
+            Assert.True(result, "CaptureWindow should return true for a valid window.");
+            Assert.True(File.Exists(tempOut), "Screenshot file must exist.");
+            var fi = new FileInfo(tempOut);
+            Assert.True(fi.Length > 0, "Screenshot file must not be empty.");
+
+            // PNG magic byte verification: 0x89, 'P', 'N', 'G'
+            var header = new byte[8];
+            using (var fs = File.OpenRead(tempOut))
+            {
+                fs.Read(header, 0, 8);
+            }
+            Assert.Equal(0x89, header[0]);
+            Assert.Equal((byte)'P', header[1]);
+            Assert.Equal((byte)'N', header[2]);
+            Assert.Equal((byte)'G', header[3]);
+        }
+        finally
+        {
+            if (File.Exists(tempOut))
+            {
+                try { File.Delete(tempOut); } catch { }
+            }
+        }
+    }
+
+    [Fact]
+    public void AppDebugScreenshotService_ProcessTriggerContent_ParsesTargetPath()
+    {
+        var customPath = @"C:\dummy\target.png";
+        var resolved = AppDebugScreenshotService.ResolveTriggerPath(customPath);
+        Assert.Equal(customPath, resolved);
+
+        var emptyResolved = AppDebugScreenshotService.ResolveTriggerPath("");
+        Assert.Equal(AppDebugScreenshotService.GetDefaultScreenshotPath(), emptyResolved);
+    }
+}