Add project files.

MangaReader.Tests/WebSearch/NatoManga/NatoMangaWebSearchTests.cs

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+using MangaReader.Core.HttpService;
+using MangaReader.Core.WebSearch;
+using MangaReader.Core.WebSearch.NatoManga;
+using MangaReader.Tests.Utilities;
+using NSubstitute;
+using Shouldly;
+
+namespace MangaReader.Tests.WebSearch.NatoManga;
+
+public class NatoMangaWebSearchTests
+{
+    [Fact]
+    public async Task Get_Search_Result()
+    {
+        string resourceName = "MangaReader.Tests.WebSearch.NatoManga.SampleSearchResult.json";
+        string searchResultJson = await ResourceHelper.ReadJsonResourceAsync(resourceName);
+
+        IHttpService httpService = Substitute.For<IHttpService>();
+
+        httpService.GetStringAsync(Arg.Any<string>())
+            .Returns(Task.FromResult(searchResultJson));
+
+        NatoMangaWebSearch webSearch = new(httpService);
+        MangaSearchResult[] searchResult = await webSearch.SearchAsync("Gals Can't Be Kind");
+
+        searchResult.Length.ShouldBe(2);
+        searchResult[0].Title.ShouldBe("Gal Can't Be Kind to Otaku!");
+        searchResult[1].Title.ShouldBe("Gal Can’t Be Kind to Otaku!?");
+        searchResult[0].Url.ShouldBe("https://www.natomanga.com/manga/gal-can-t-be-kind-to-otaku");
+        searchResult[1].Url.ShouldBe("https://www.natomanga.com/manga/gal-cant-be-kind-to-otaku");
+    }
+}