Test and Snapshop tests

Author: egil

Directory.Build.props

@@ -1,5 +1,20 @@
 <Project>
-    <PropertyGroup>
-        <AspNetCoreVersion>3.0.0</AspNetCoreVersion>
-    </PropertyGroup>
-</Project>
+  <PropertyGroup>
+    <AspNetCoreVersion>3.1.0-preview1.19508.20</AspNetCoreVersion>
+  </PropertyGroup>
+
+  <PropertyGroup>
+    <LangVersion>8.0</LangVersion>
+    <Nullable>enable</Nullable>
+    <WarningsAsErrors>CS8600;CS8602;CS8603;CS8625</WarningsAsErrors>
+  </PropertyGroup>
+
+  <PropertyGroup>
+    <AnnotatedReferenceAssemblyVersion>3.0.0</AnnotatedReferenceAssemblyVersion>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="TunnelVisionLabs.ReferenceAssemblyAnnotator" Version="1.0.0-alpha.90" PrivateAssets="all" />
+    <PackageDownload Include="Microsoft.NETCore.App.Ref" Version="[$(AnnotatedReferenceAssemblyVersion)]" />
+  </ItemGroup>
+
+</Project>

src/AngleSharp.Diffing/Diff.cs

@@ -0,0 +1,45 @@
+using System.Collections.Generic;
+using System.Linq;
+using AngleSharp.Diffing.Strategies;
+using AngleSharp.Diffing;
+using AngleSharp.Html.Parser;
+using AngleSharp;
+using AngleSharp.Dom;
+using AngleSharp.Diffing.Core;
+
+namespace Egil.RazorComponents.Testing
+{
+    public sealed class HtmlComparer : IHtmlComparer
+    {
+        private readonly IBrowsingContext _context;
+        private readonly IHtmlParser _htmlParser;
+        private readonly IDocument _document;
+        private readonly HtmlDifferenceEngine _differenceEngine;
+
+        public HtmlComparer()
+        {
+            var diffOptions = new DiffingStrategyPipeline();
+            diffOptions.AddDefaultOptions();
+            _differenceEngine = new HtmlDifferenceEngine(diffOptions);
+            var config = Configuration.Default.WithCss();
+            _context = BrowsingContext.New(config);
+            _htmlParser = _context.GetService<IHtmlParser>();
+            _document = _context.OpenNewAsync().Result;
+        }
+
+        public List<IDiff> Compare(string controlHtml, string testHtml)
+        {
+            return _differenceEngine.Compare(Parse(controlHtml), Parse(testHtml)).ToList();
+        }
+
+        public void Dispose()
+        {
+            _document.Dispose();
+        }
+
+        private INodeList Parse(string html)
+        {
+            return _htmlParser.ParseFragment(html, _document.Body);
+        }
+    }
+}

src/AngleSharp.Diffing/DiffBuilder.cs

@@ -4,13 +4,11 @@
     <RootNamespace>Egil.RazorComponents.Testing</RootNamespace>
     <TargetFramework>netstandard2.0</TargetFramework>
     <RazorLangVersion>3.0</RazorLangVersion>
-    <LangVersion>8.0</LangVersion>
-    <Nullable>enable</Nullable>
-    <TreatWarningsAsErrors>false</TreatWarningsAsErrors>
     <PackageId>Razor.Components.Testing.Library</PackageId>
     <PackageLicenseExpression></PackageLicenseExpression>
     <PackageLicenseFile>LICENSE</PackageLicenseFile>
     <RepositoryUrl>https://github.com/egil/razor-components-testing-library</RepositoryUrl>
+    <RepositoryType>git</RepositoryType>
     <PackageProjectUrl>https://github.com/egil/razor-components-testing-library</PackageProjectUrl>
     <PackageTags>razor-components unit-testing testing blazor blazor-server-side blazor-client-side</PackageTags>
     <Version>0.1.0-preview9-19424-4-3</Version>
@@ -20,21 +18,26 @@
     <Description>
       Testing library for Razor Components, that allows you to easily define your component under test and the expected output HTML in a .razor files. See the projects GitHub page for usage details: https://github.com/egil/razor-components-testing-library
     </Description>
+    <PublishRepositoryUrl>true</PublishRepositoryUrl>
+    <EmbedUntrackedSources>true</EmbedUntrackedSources>
+    <IncludeSymbols>true</IncludeSymbols>
+    <SymbolPackageFormat>snupkg</SymbolPackageFormat>  
   </PropertyGroup>
 
+  <ItemGroup>
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0-beta2-19554-01" PrivateAssets="All" />
+  </ItemGroup>
+
   <ItemGroup>
     <PackageReference Include="AngleSharp" Version="0.13.0" />
-    <PackageReference Include="Microsoft.AspNetCore.Components" Version="$(AspNetCoreVersion)" />
-    <PackageReference Include="Microsoft.AspNetCore.Components.Web" Version="$(AspNetCoreVersion)" />
-    <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="2.9.4">
-      <PrivateAssets>all</PrivateAssets>
-      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
-    </PackageReference>
-    <PackageReference Include="Microsoft.CodeAnalysis.FxCopAnalyzers" Version="2.9.4">
+    <PackageReference Include="AngleSharp.Css" Version="0.13.0" />
+    <PackageReference Include="AngleSharp.Diffing" Version="0.13.0-preview-2" />   
+    <PackageReference Include="Microsoft.AspNetCore.Components" Version="3.1.0-preview2.19528.8" />
+    <PackageReference Include="Microsoft.AspNetCore.Components.Web" Version="3.1.0-preview2.19528.8" />
+    <PackageReference Include="Microsoft.CodeAnalysis.FxCopAnalyzers" Version="2.9.7">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="XMLUnit.Core" Version="2.7.1" />
     <PackageReference Include="xunit.assert" Version="2.4.1" />
     <PackageReference Include="xunit.extensibility.core" Version="2.4.1" />
   </ItemGroup>