Phase 0 (T1-3/4/7/9/11): find bar w/ native Find API + search engine + site zoom + force reload + F11, wired into MainWindow, E2E smoke (39 tests)

VideoDownloader.Tests/E2E/MainWindowSmokeE2ETests.cs

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+using System.Windows;
+using VideoDownloader.App;
+using VideoDownloader.Tests.Infrastructure;
+
+namespace VideoDownloader.Tests.E2E;
+
+/// <summary>
+/// E2E 스모크: 실제 MainWindow 를 기동해 WebView2 초기화·탐색·검색 바·전체화면 전환이
+/// 크래시 없이 동작하는지 검증한다(Phase 0 통합 확인). 네트워크 의존 제거를 위해 about:blank 사용.
+/// </summary>
+[Collection("E2E")]
+public class MainWindowSmokeE2ETests
+{
+    [Fact]
+    public async Task MainWindow_기동_탐색_검색바_전체화면_스모크()
+    {
+        using var sta = StaDispatcher.Start();
+        WpfTestApp.Ensure(sta.Dispatcher);
+        var ok = await sta.InvokeAsync(async () =>
+        {
+            var window = new MainWindow();
+            window.Show();
+
+            // WebView2 초기화 대기 (Loaded → InitializeBrowserAsync)
+            var cv = await Wait.Until(
+                () => Task.FromResult(window.Browser.CoreWebView2),
+                c => c != null, 30000);
+
+            // about:blank 탐색 (네트워크 불필요)
+            window.NavigateTo("about:blank");
+            await Wait.Until(
+                () => Task.FromResult(cv.Source ?? ""),
+                s => s.Contains("about:blank"), 15000);
+
+            // T1-3 검색 바 열기/닫기
+            window.OpenFind();
+            var findVisible = window.FindBar.Visibility == Visibility.Visible;
+            window.CloseFind();
+            var findCollapsed = window.FindBar.Visibility == Visibility.Collapsed;
+
+            // T1-11 전체화면 토글
+            window.ToggleFullscreen();
+            var toolbarHidden = window.ToolbarRow.Visibility == Visibility.Collapsed;
+            window.ToggleFullscreen();
+            var toolbarBack = window.ToolbarRow.Visibility == Visibility.Visible;
+
+            window.Close();
+            return (init: cv != null, nav: true, findVisible, findCollapsed, toolbarHidden, toolbarBack);
+        });
+
+        Assert.True(ok.init, "WebView2 초기화 실패");
+        Assert.True(ok.nav);
+        Assert.True(ok.findVisible, "검색 바 미표시");
+        Assert.True(ok.findCollapsed, "검색 바 미닫힘");
+        Assert.True(ok.toolbarHidden, "전체화면에서 툴바 미숨김");
+        Assert.True(ok.toolbarBack, "전체화면 복원 실패");
+    }
+}

VideoDownloader.Tests/E2E/WebView2FindE2ETests.cs

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+using System.Windows;
+using System.Windows.Threading;
+using Microsoft.Web.WebView2.Core;
+using VideoDownloader.Tests.Infrastructure;
+
+namespace VideoDownloader.Tests.E2E;
+
+/// <summary>
+/// E2E: 실제 WebView2 + 네이티브 Find API(CoreWebView2.Find) 검증(T1-3).
+/// WebView2 런타임 위에서 매치 카운트/활성 인덱스가 실제로 발생하는지 확인한다.
+/// </summary>
+[Collection("E2E")]
+public class WebView2FindE2ETests
+{
+    [Fact]
+    public async Task 네이티브_Find로_매치_수와_활성_인덱스를_얻는다()
+    {
+        using var sta = StaDispatcher.Start();
+        var udf = Path.Combine(Path.GetTempPath(), $"vd_e2e_{Guid.NewGuid():N}");
+        var result = await sta.InvokeAsync(async () =>
+        {
+            var window = new Window();
+            var browser = new Microsoft.Web.WebView2.Wpf.WebView2();
+            window.Content = browser;
+            window.Show();
+
+            var env = await CoreWebView2Environment.CreateAsync(userDataFolder: udf);
+            await browser.EnsureCoreWebView2Async(env);
+            var cv = browser.CoreWebView2;
+            cv.Settings.AreDefaultScriptDialogsEnabled = false;
+
+            var html = "<html><body><p>hello world hello brave hello</p></body></html>";
+            cv.NavigateToString(html);
+            await WaitUntilNavCompleted(cv);
+
+            // 네이티브 Find API — SuppressDefaultFindDialog 로 자체 UI 전제 검증
+            int matchCount = -1, activeIndex = -1;
+            cv.Find.MatchCountChanged += (_, _) => matchCount = cv.Find.MatchCount;
+            cv.Find.ActiveMatchIndexChanged += (_, _) => activeIndex = cv.Find.ActiveMatchIndex;
+
+            var options = env.CreateFindOptions();
+            options.FindTerm = "hello";
+            options.ShouldHighlightAllMatches = true;
+            options.SuppressDefaultFindDialog = true;
+            await cv.Find.StartAsync(options);
+
+            await Wait.Until(() => Task.FromResult(matchCount), c => c > 0, 10000);
+            var countAfterStart = matchCount;
+
+            cv.Find.FindNext();
+            await Wait.Until(() => Task.FromResult(activeIndex), i => i >= 1, 10000);
+
+            cv.Find.Stop();
+            window.Close();
+            return (countAfterStart, activeIndex);
+        });
+
+        try { Directory.Delete(udf, true); } catch { }
+        Assert.Equal(3, result.countAfterStart);
+        Assert.True(result.activeIndex >= 1, $"활성 인덱스가 진행되지 않음: {result.activeIndex}");
+    }
+
+    private static Task WaitUntilNavCompleted(CoreWebView2 cv)
+    {
+        var tcs = new TaskCompletionSource(TaskCreationOptions.RunContinuationsAsynchronously);
+        EventHandler<CoreWebView2NavigationCompletedEventArgs>? h = null;
+        h = (_, _) => { cv.NavigationCompleted -= h; tcs.TrySetResult(); };
+        cv.NavigationCompleted += h;
+        return tcs.Task.WaitAsync(TimeSpan.FromSeconds(15));
+    }
+}