diff --git a/VideoDownloader.App/Browser/SearchEngine.cs b/VideoDownloader.App/Browser/SearchEngine.cs
new file mode 100644
index 0000000..8138bf3
--- /dev/null
+++ b/VideoDownloader.App/Browser/SearchEngine.cs
@@ -0,0 +1,34 @@
+namespace VideoDownloader.App.Browser;
+
+/// <summary>검색엔진 정의. QueryTemplate 의 {0} 이 URL 인코딩된 검색어로 치환된다.</summary>
+public sealed record SearchEngine(string Name, string Keyword, string QueryTemplate);
+
+/// <summary>기본 프리셋 엔진. Keyword 는 주소창에서 `&lt;키워드&gt; &lt;검색어&gt;` 형태로 즉시 전환에 쓰인다.</summary>
+public static class SearchEngines
+{
+    public static readonly IReadOnlyList<SearchEngine> Presets = new[]
+    {
+        new SearchEngine("Google",     "g",  "https://www.google.com/search?q={0}"),
+        new SearchEngine("Bing",       "b",  "https://www.bing.com/search?q={0}"),
+        new SearchEngine("DuckDuckGo", "d",  "https://duckduckgo.com/?q={0}"),
+        new SearchEngine("Naver",      "n",  "https://search.naver.com/search.naver?query={0}"),
+        new SearchEngine("YouTube",    "yt", "https://www.youtube.com/results?search_query={0}"),
+    };
+
+    public static SearchEngine? FindByName(string? name, IEnumerable<SearchEngine>? extra = null)
+    {
+        var pool = extra != null ? Presets.Concat(extra) : Presets;
+        return pool.FirstOrDefault(e =>
+            string.Equals(e.Name, name, StringComparison.OrdinalIgnoreCase));
+    }
+
+    public static SearchEngine? FindByKeyword(string? keyword, IEnumerable<SearchEngine>? extra = null)
+    {
+        var pool = extra != null ? Presets.Concat(extra) : Presets;
+        return pool.FirstOrDefault(e =>
+            string.Equals(e.Keyword, keyword, StringComparison.OrdinalIgnoreCase));
+    }
+}
+
+/// <summary>주소창 입력에 대한 네비게이션 의도. IsUrl=false 면 Target 은 검색 결과 URL.</summary>
+public sealed record NavigationIntent(bool IsUrl, string Target, string? EngineName = null);
diff --git a/VideoDownloader.App/Browser/SearchEngineResolver.cs b/VideoDownloader.App/Browser/SearchEngineResolver.cs
new file mode 100644
index 0000000..a56e306
--- /dev/null
+++ b/VideoDownloader.App/Browser/SearchEngineResolver.cs
@@ -0,0 +1,80 @@
+using System.Text.RegularExpressions;
+
+namespace VideoDownloader.App.Browser;
+
+/// <summary>
+/// 주소창 입력을 URL 또는 검색 의도로 판별한다(T1-4).
+/// 판별 순서: ① 명시적 스킴 ② localhost/IPv4 ③ 도메인 형태 ④ 키워드 접두(`g `, `yt `) ⑤ 기본 엔진 검색.
+/// </summary>
+public sealed partial class SearchEngineResolver
+{
+    private readonly SearchEngine _default;
+    private readonly List<SearchEngine> _custom;
+
+    public SearchEngineResolver(string defaultEngineName, IEnumerable<SearchEngine>? customEngines = null)
+    {
+        _default = SearchEngines.FindByName(defaultEngineName, customEngines)
+                    ?? SearchEngines.Presets[0];
+        _custom = customEngines?.ToList() ?? new();
+    }
+
+    public SearchEngine DefaultEngine => _default;
+
+    /// <summary>입력이 비었으면 null, URL 이면 URL 의도, 아니면 검색 결과 URL 의도.</summary>
+    public NavigationIntent? Resolve(string? input)
+    {
+        input = input?.Trim();
+        if (string.IsNullOrEmpty(input)) return null;
+
+        if (HasScheme(input))
+            return new NavigationIntent(true, input);
+
+        if (IsLocalHost(input) || IsIpv4(input))
+            return new NavigationIntent(true, "https://" + input);
+
+        if (LooksLikeDomain(input))
+            return new NavigationIntent(true, "https://" + input);
+
+        // 키워드 전환: "g 고양이" → Google 검색. 미등록 키워드는 검색어의 일부.
+        if (MatchKeyword(input) is { } kw)
+            return new NavigationIntent(false, Format(kw.engine, kw.query), kw.engine.Name);
+
+        return new NavigationIntent(false, Format(_default, input), _default.Name);
+    }
+
+    private static string Format(SearchEngine engine, string query)
+        => string.Format(engine.QueryTemplate, Uri.EscapeDataString(query).Replace("%20", "+"));
+
+    private (SearchEngine engine, string query)? MatchKeyword(string input)
+    {
+        var m = KeywordPrefix().Match(input);
+        if (!m.Success) return null;
+        var engine = SearchEngines.FindByKeyword(m.Groups[1].Value, _custom);
+        return engine == null ? null : (engine, m.Groups[2].Value);
+    }
+
+    private static bool HasScheme(string s) =>
+        s.StartsWith("http://", StringComparison.OrdinalIgnoreCase)
+        || s.StartsWith("https://", StringComparison.OrdinalIgnoreCase)
+        || s.StartsWith("file://", StringComparison.OrdinalIgnoreCase)
+        || s.StartsWith("about:", StringComparison.OrdinalIgnoreCase)
+        || s.StartsWith("data:", StringComparison.OrdinalIgnoreCase)
+        || s.StartsWith("blob:", StringComparison.OrdinalIgnoreCase);
+
+    private static bool IsLocalHost(string s) =>
+        s.Equals("localhost", StringComparison.OrdinalIgnoreCase)
+        || s.StartsWith("localhost:", StringComparison.OrdinalIgnoreCase);
+
+    private static bool IsIpv4(string s) =>
+        s.Length > 7 && s[0] >= '0' && s[0] <= '9' && Regex.IsMatch(s, @"^\d{1,3}(\.\d{1,3}){3}(:\d+)?([/?#].*)?$");
+
+    private static bool LooksLikeDomain(string s) =>
+        DomainPattern().IsMatch(s);
+
+    // 라벨.라벨[.라벨...] 형태(최소 점 1개) + 선택적 포트/경로. 공백 포함 시 불일치.
+    [GeneratedRegex(@"^[a-zA-Z0-9]([a-zA-Z0-9\-]*[a-zA-Z0-9])?(\.[a-zA-Z0-9]([a-zA-Z0-9\-]*[a-zA-Z0-9])?)+(:\d+)?([/?#].*)?$")]
+    private static partial Regex DomainPattern();
+
+    [GeneratedRegex(@"^(\S+)\s+(.+)$", RegexOptions.Singleline)]
+    private static partial Regex KeywordPrefix();
+}
diff --git a/VideoDownloader.App/Browser/SiteZoomStore.cs b/VideoDownloader.App/Browser/SiteZoomStore.cs
new file mode 100644
index 0000000..81f63f3
--- /dev/null
+++ b/VideoDownloader.App/Browser/SiteZoomStore.cs
@@ -0,0 +1,106 @@
+using System.IO;
+using System.Text.Json;
+
+namespace VideoDownloader.App.Browser;
+
+/// <summary>
+/// 사이트별 줌 배율 영속 저장소(T1-7). WebView2 는 사이트별 줌 영속을 보장하지 않아
+/// 앱이 도메인→배율 사전을 SSOT 로 관리한다. LRU 300개, 저장 즉시 원자적 파일 기록.
+/// </summary>
+public sealed class SiteZoomStore
+{
+    private sealed record Entry(double Zoom, long LastUsedTicks);
+
+    private const int MaxEntries = 300;
+    private const double Min = 0.1, Max = 5.0;
+
+    private readonly string _path;
+    private readonly object _lock = new();
+    private readonly Dictionary<string, Entry> _map = new(StringComparer.OrdinalIgnoreCase);
+
+    public SiteZoomStore(string path)
+    {
+        _path = path;
+        try
+        {
+            if (File.Exists(path))
+            {
+                var loaded = JsonSerializer.Deserialize<Dictionary<string, Entry>>(File.ReadAllText(path));
+                if (loaded != null)
+                    foreach (var (k, v) in loaded) _map[k] = v;
+            }
+        }
+        catch
+        {
+            // 손상된 JSON → 빈 상태로 시작(기존 BrowserStore 정책과 동일)
+            _map.Clear();
+        }
+    }
+
+    public int Count { get { lock (_lock) return _map.Count; } }
+
+    /// <summary>URL 의 호스트에 저장된 배율. 없으면 1.0. 읽기는 LRU 를 갱신한다.</summary>
+    public double Get(string? url)
+    {
+        var host = NormalizeHost(url);
+        if (host == null) return 1.0;
+        lock (_lock)
+        {
+            if (_map.TryGetValue(host, out var e))
+            {
+                _map[host] = e with { LastUsedTicks = DateTime.UtcNow.Ticks };
+                return e.Zoom;
+            }
+        }
+        return 1.0;
+    }
+
+    /// <summary>배율 저장(0.1~5.0 클램프). 초과분은 가장 오래된 사용 순으로 제거 후 즉시 영속.</summary>
+    public void Set(string? url, double zoom)
+    {
+        var host = NormalizeHost(url);
+        if (host == null) return;
+        zoom = Math.Clamp(zoom, Min, Max);
+        lock (_lock)
+        {
+            _map[host] = new Entry(zoom, DateTime.UtcNow.Ticks);
+            if (_map.Count > MaxEntries)
+                foreach (var k in _map.OrderBy(kv => kv.Value.LastUsedTicks).Take(_map.Count - MaxEntries).Select(kv => kv.Key).ToList())
+                    _map.Remove(k);
+            Save();
+        }
+    }
+
+    public void Clear()
+    {
+        lock (_lock)
+        {
+            _map.Clear();
+            try { if (File.Exists(_path)) File.Delete(_path); } catch { }
+        }
+    }
+
+    private void Save()
+    {
+        try
+        {
+            var dir = Path.GetDirectoryName(_path);
+            if (!string.IsNullOrEmpty(dir)) Directory.CreateDirectory(dir);
+            var tmp = _path + ".tmp";
+            File.WriteAllText(tmp, JsonSerializer.Serialize(_map));
+            File.Move(tmp, _path, overwrite: true);
+        }
+        catch
+        {
+            // 저장 실패는 메모리 상태는 유지(조용한 내구성 저하)
+        }
+    }
+
+    private static string? NormalizeHost(string? url)
+    {
+        if (string.IsNullOrWhiteSpace(url)) return null;
+        if (!Uri.TryCreate(url, UriKind.Absolute, out var uri) || string.IsNullOrEmpty(uri.Host)) return null;
+        var host = uri.Host;
+        return host.StartsWith("www.", StringComparison.OrdinalIgnoreCase) ? host[4..] : host;
+    }
+}
diff --git a/VideoDownloader.Tests/Browser/SearchEngineResolverTests.cs b/VideoDownloader.Tests/Browser/SearchEngineResolverTests.cs
new file mode 100644
index 0000000..105bffc
--- /dev/null
+++ b/VideoDownloader.Tests/Browser/SearchEngineResolverTests.cs
@@ -0,0 +1,113 @@
+using VideoDownloader.App.Browser;
+
+namespace VideoDownloader.Tests.Browser;
+
+// T1-4 검색엔진: 주소창 입력이 URL인지 검색어인지 판별하고, 키워드(g, yt, ...)로 엔진을 전환한다.
+public class SearchEngineResolverTests
+{
+    private readonly SearchEngineResolver _resolver = new("Google");
+
+    [Theory]
+    [InlineData("https://example.com", "https://example.com")]           // 스킴 있음 → 그대로
+    [InlineData("http://example.com/path?q=1", "http://example.com/path?q=1")]
+    [InlineData("example.com", "https://example.com")]                   // 도메인 → https 보정
+    [InlineData("www.example.co.kr/a/b", "https://www.example.co.kr/a/b")]
+    [InlineData("sub.domain.org", "https://sub.domain.org")]
+    [InlineData("localhost", "https://localhost")]                       // localhost → URL
+    [InlineData("localhost:8080/x", "https://localhost:8080/x")]
+    [InlineData("192.168.1.10", "https://192.168.1.10")]                 // IPv4 → URL
+    [InlineData("192.168.1.10:9000/v.html", "https://192.168.1.10:9000/v.html")]
+    [InlineData("file:///C:/tmp/a.html", "file:///C:/tmp/a.html")]
+    public void Url_입력은_URL_의도로_판별한다(string input, string expected)
+    {
+        var intent = _resolver.Resolve(input);
+        Assert.True(intent.IsUrl);
+        Assert.Equal(expected, intent.Target);
+    }
+
+    [Theory]
+    [InlineData("hello world")]        // 공백 포함 일반어 → 검색
+    [InlineData("cats")]               // 점 없는 단일 단어 → 검색
+    [InlineData("how to download mp4")]
+    [InlineData("나는 한국어 검색어")]
+    public void 검색어_입력은_기본_엔진으로_검색한다(string input)
+    {
+        var intent = _resolver.Resolve(input);
+        Assert.False(intent.IsUrl);
+        Assert.Equal("https://www.google.com/search?q=" + Uri.EscapeDataString(input).Replace("%20", "+"), intent.Target);
+        Assert.Equal("Google", intent.EngineName);
+    }
+
+    [Fact]
+    public void 키워드_g는_Google로_라우팅한다()
+    {
+        var intent = _resolver.Resolve("g cute cats");
+        Assert.False(intent.IsUrl);
+        Assert.Contains("google.com/search", intent.Target);
+        Assert.Contains("cute+cats", intent.Target);
+    }
+
+    [Fact]
+    public void 키워드_yt는_YouTube_검색으로_라우팅한다()
+    {
+        var intent = _resolver.Resolve("yt lofi beats");
+        Assert.False(intent.IsUrl);
+        Assert.Contains("youtube.com/results", intent.Target);
+        Assert.Equal("YouTube", intent.EngineName);
+    }
+
+    [Fact]
+    public void 기본_엔진을_Bing으로_바꾸면_일반_검색어가_Bing으로_간다()
+    {
+        var r = new SearchEngineResolver("Bing");
+        var intent = r.Resolve("weather today");
+        Assert.False(intent.IsUrl);
+        Assert.Contains("bing.com/search", intent.Target);
+    }
+
+    [Fact]
+    public void 알_수_없는_키워드는_검색어의_일부로_취급한다()
+    {
+        // "zzz query" — zzz 는 등록된 키워드가 아님 → 전체가 기본 엔진 검색어
+        var intent = _resolver.Resolve("zzz query");
+        Assert.False(intent.IsUrl);
+        Assert.Contains("zzz+query", intent.Target);
+    }
+
+    [Fact]
+    public void 키워드_단독_입력은_검색어로_취급한다()
+    {
+        var intent = _resolver.Resolve("g");
+        Assert.False(intent.IsUrl);
+        Assert.EndsWith("q=g", intent.Target); // "g" 자체를 기본 엔진으로 검색
+    }
+
+    [Fact]
+    public void 커스텀_엔진_키워드를_등록하면_사용_가능하다()
+    {
+        var r = new SearchEngineResolver("Google", customEngines:
+            new[] { new SearchEngine("Wikipedia", "w", "https://en.wikipedia.org/wiki/Special:Search?search={0}") });
+        var intent = r.Resolve("w mars rover");
+        Assert.False(intent.IsUrl);
+        Assert.Contains("wikipedia.org", intent.Target);
+        Assert.Equal("Wikipedia", intent.EngineName);
+    }
+
+    [Fact]
+    public void 빈_입력은_Null을_반환한다()
+    {
+        Assert.Null(_resolver.Resolve(""));
+        Assert.Null(_resolver.Resolve("   "));
+    }
+
+    [Fact]
+    public void 프리셋에는_주요_엔진이_포함된다()
+    {
+        var names = SearchEngines.Presets.Select(e => e.Name).ToList();
+        Assert.Contains("Google", names);
+        Assert.Contains("Bing", names);
+        Assert.Contains("DuckDuckGo", names);
+        Assert.Contains("Naver", names);   // 한국 사용자
+        Assert.Contains("YouTube", names);
+    }
+}
diff --git a/VideoDownloader.Tests/Browser/SiteZoomStoreTests.cs b/VideoDownloader.Tests/Browser/SiteZoomStoreTests.cs
new file mode 100644
index 0000000..72f6f46
--- /dev/null
+++ b/VideoDownloader.Tests/Browser/SiteZoomStoreTests.cs
@@ -0,0 +1,95 @@
+using VideoDownloader.App.Browser;
+
+namespace VideoDownloader.Tests.Browser;
+
+// T1-7 사이트별 줌 영속: 도메인→배율 저장, 범위 클램프, JSON 영속, 최대 항목 제한.
+public class SiteZoomStoreTests : IDisposable
+{
+    private readonly string _path;
+    private readonly SiteZoomStore _store;
+
+    public SiteZoomStoreTests()
+    {
+        _path = Path.Combine(Path.GetTempPath(), $"zoomstore_{Guid.NewGuid():N}.json");
+        _store = new SiteZoomStore(_path);
+    }
+
+    public void Dispose()
+    {
+        try { File.Delete(_path); } catch { }
+    }
+
+    [Fact]
+    public void 미등록_사이트는_기본값_1_0을_반환한다()
+    {
+        Assert.Equal(1.0, _store.Get("https://example.com/page"));
+    }
+
+    [Fact]
+    public void 배율을_저장하면_같은_호스트의_다른_경로에서도_읽힌다()
+    {
+        _store.Set("https://example.com/a", 1.5);
+        Assert.Equal(1.5, _store.Get("https://example.com/b/c/d"));
+    }
+
+    [Fact]
+    public void www_접두사는_동일_호스트로_정규화된다()
+    {
+        _store.Set("https://www.example.com/a", 2.0);
+        Assert.Equal(2.0, _store.Get("https://example.com/b"));
+    }
+
+    [Theory]
+    [InlineData(0.05, 0.1)]    // 하한 클램프
+    [InlineData(9.0, 5.0)]     // 상한 클램프
+    [InlineData(1.25, 1.25)]   // 정상 범위
+    public void 배율은_0_1에서_5_0으로_클램프된다(double input, double expected)
+    {
+        _store.Set("https://clamp.com/", input);
+        Assert.Equal(expected, _store.Get("https://clamp.com/"));
+    }
+
+    [Fact]
+    public void 저장_즉시_파일에_영속되어_새_인스턴스가_읽는다()
+    {
+        _store.Set("https://persist.com/", 1.75);
+        Assert.True(File.Exists(_path));
+        var reloaded = new SiteZoomStore(_path);
+        Assert.Equal(1.75, reloaded.Get("https://persist.com/other"));
+    }
+
+    [Fact]
+    public void 최대_300개_초과시_가장_오래_사용하지_한_항목부터_제거된다()
+    {
+        // 300개 채우기
+        for (int i = 0; i < 300; i++)
+            _store.Set($"https://site{i}.com/", 1.0 + i * 0.001);
+        // 가장 먼저 넣은 site0 을 최근에 다시 설정(LRU 갱신) → site1 이 제거 후보가 됨
+        _store.Set("https://site0.com/", 1.9);
+        // 하나 더 추가 → 초과분 제거
+        _store.Set("https://new.com/", 2.0);
+
+        Assert.Equal(300, _store.Count);
+        Assert.Equal(1.0, _store.Get("https://site1.com/"));  // 제거됨 → 기본값
+        Assert.Equal(2.0, _store.Get("https://new.com/"));    // 유지
+        Assert.Equal(1.9, _store.Get("https://site0.com/"));  // LRU 갱신됨 → 유지
+    }
+
+    [Fact]
+    public void Clear는_모든_항목과_파일을_지운다()
+    {
+        _store.Set("https://x.com/", 2.0);
+        _store.Clear();
+        Assert.Equal(0, _store.Count);
+        Assert.Equal(1.0, _store.Get("https://x.com/"));
+        Assert.False(File.Exists(_path));
+    }
+
+    [Fact]
+    public void 손상된_JSON은_무시하고_빈_상태로_시작한다()
+    {
+        File.WriteAllText(_path, "{ not json !!");
+        var store = new SiteZoomStore(_path);
+        Assert.Equal(0, store.Count);
+    }
+}
diff --git a/VideoDownloader.Tests/GlobalUsings.cs b/VideoDownloader.Tests/GlobalUsings.cs
new file mode 100644
index 0000000..8bc619f
--- /dev/null
+++ b/VideoDownloader.Tests/GlobalUsings.cs
@@ -0,0 +1,2 @@
+global using Xunit;
+global using System.IO;
diff --git a/VideoDownloader.Tests/Infrastructure/StaDispatcher.cs b/VideoDownloader.Tests/Infrastructure/StaDispatcher.cs
new file mode 100644
index 0000000..9be198f
--- /dev/null
+++ b/VideoDownloader.Tests/Infrastructure/StaDispatcher.cs
@@ -0,0 +1,72 @@
+using System.Windows.Threading;
+
+namespace VideoDownloader.Tests.Infrastructure;
+
+/// <summary>
+/// WPF/WebView2 E2E 테스트용 STA 디스패처. 전용 STA 스레드에서 Dispatcher.Run() 으로
+/// 메시지 펌프를 돌리며, 테스트 코드는 InvokeAsync 로 UI 스레드에 작업을 올린다.
+/// WebView2 이벤트(비동기)는 UI 스레드 디스패처에서 발생하므로 async 흐름도 이 펌프 위에서 완결된다.
+/// </summary>
+public sealed class StaDispatcher : IDisposable
+{
+    private readonly Thread _thread;
+    private readonly TaskCompletionSource _ready = new(TaskCreationOptions.RunContinuationsAsynchronously);
+    private Dispatcher? _dispatcher;
+
+    private StaDispatcher(Thread thread)
+    {
+        _thread = thread;
+    }
+
+    public Dispatcher Dispatcher =>
+        _dispatcher ?? throw new InvalidOperationException("STA dispatcher not started");
+
+    public static StaDispatcher Start()
+    {
+        var sta = default(StaDispatcher)!;
+        var thread = new Thread(() =>
+        {
+            sta._dispatcher = Dispatcher.CurrentDispatcher;
+            sta._ready.TrySetResult();
+            Dispatcher.Run();
+        });
+        thread.SetApartmentState(ApartmentState.STA);
+        thread.IsBackground = true;
+        sta = new StaDispatcher(thread);
+        thread.Start();
+        sta._ready.Task.Wait(5000);
+        return sta;
+    }
+
+    public Task<T> InvokeAsync<T>(Func<Task<T>> func)
+        => Dispatcher.InvokeAsync(func).Task.Unwrap();
+
+    public Task InvokeAsync(Func<Task> func)
+        => Dispatcher.InvokeAsync(func).Task.Unwrap();
+
+    public T Invoke<T>(Func<T> func) => Dispatcher.Invoke(func);
+
+    public void Invoke(Action action) => Dispatcher.Invoke(action);
+
+    public void Dispose()
+    {
+        try { Dispatcher.InvokeShutdown(); } catch { }
+        try { _thread.Join(5000); } catch { }
+    }
+}
+
+/// <summary>WebView2 비동기 초기화/이벤트 대기 공통 유틸.</summary>
+public static class Wait
+{
+    public static async Task<T> Until<T>(Func<Task<T>> poll, Func<T, bool> done, int timeoutMs = 15000, int intervalMs = 100)
+    {
+        var sw = System.Diagnostics.Stopwatch.StartNew();
+        while (sw.ElapsedMilliseconds < timeoutMs)
+        {
+            var v = await poll();
+            if (done(v)) return v;
+            await Task.Delay(intervalMs);
+        }
+        throw new TimeoutException($"조건 미충족 ({timeoutMs}ms 초과)");
+    }
+}
diff --git a/VideoDownloader.Tests/VideoDownloader.Tests.csproj b/VideoDownloader.Tests/VideoDownloader.Tests.csproj
new file mode 100644
index 0000000..edc0567
--- /dev/null
+++ b/VideoDownloader.Tests/VideoDownloader.Tests.csproj
@@ -0,0 +1,19 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net8.0-windows</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <IsPackable>false</IsPackable>
+    <UseWPF>true</UseWPF>
+    <EnableWindowsTargeting>true</EnableWindowsTargeting>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
+    <PackageReference Include="xunit" Version="2.9.2" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\VideoDownloader.App\VideoDownloader.App.csproj" />
+    <ProjectReference Include="..\VideoDownloader.Core\VideoDownloader.Core.csproj" />
+  </ItemGroup>
+</Project>
diff --git a/VideoDownloader.slnx b/VideoDownloader.slnx
index 1415fc8..a6b90d2 100644
--- a/VideoDownloader.slnx
+++ b/VideoDownloader.slnx
@@ -3,4 +3,5 @@
   <Project Path="VideoDownloader.Avalonia/VideoDownloader.Avalonia.csproj" />
   <Project Path="VideoDownloader.Cli/VideoDownloader.Cli.csproj" />
   <Project Path="VideoDownloader.Core/VideoDownloader.Core.csproj" />
+  <Project Path="VideoDownloader.Tests/VideoDownloader.Tests.csproj" />
 </Solution>