Cleaned up an edge case in AnalyzeCSharp where the full base path is …

…just a slash. Also fixed some edge cases with root pathing in the test file provider.

Directory.Build.props

@@ -22,6 +22,7 @@
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <TargetFramework>netcoreapp3.1</TargetFramework>
     <EmbedUntrackedSources>true</EmbedUntrackedSources>
+    <WarningsNotAsErrors>NU1901;NU1902;NU1903;NU1904;CA1724</WarningsNotAsErrors>
   </PropertyGroup>
   <ItemGroup>
     <None Include="$(MSBuildThisFileDirectory)\LICENSE.md" Pack="true" PackagePath=""/>

src/core/Statiq.Testing/IO/TestDirectory.cs

@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using System.Security.Cryptography;
 using System.Threading.Tasks;
 using Statiq.Common;
 
@@ -16,14 +17,17 @@ public TestDirectory(IReadOnlyFileSystem fileSystem, TestFileProvider fileProvid
         {
             _fileSystem = fileSystem;
             _fileProvider = fileProvider;
-            Path = path;
+
+            // Use a slash for an empty path (can't compare to NormalizePath.Empty since this might be absolute
+            // in the case of a ".." from the globber, and that's always relative, so compare against FullPath)
+            Path = path.FullPath == string.Empty ? NormalizedPath.Slash : path;
         }
 
         public NormalizedPath Path { get; }
 
         NormalizedPath IFileSystemEntry.Path => Path;
 
-        public bool Exists => _fileProvider.Directories.Contains(Path);
+        public bool Exists => Path == NormalizedPath.Slash || _fileProvider.Directories.Contains(Path);
 
         public DateTime LastWriteTime { get; set; }
 

src/core/Statiq.Testing/IO/TestFileProvider.cs

@@ -71,4 +71,4 @@ public void AddFile(NormalizedPath path, string content = "")
 
         IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
     }
-}
+}

src/extensions/Statiq.CodeAnalysis/AnalyzeCSharp.cs

@@ -462,7 +462,8 @@ protected override async Task<IEnumerable<IDocument>> ExecuteContextAsync(IExecu
                 .WithReferences(mscorlib)
                 .WithOptions(new CSharpCompilationOptions(
                     OutputKind.DynamicallyLinkedLibrary,
-                    xmlReferenceResolver: new XmlFileResolver(context.FileSystem.RootPath.FullPath)));
+                    xmlReferenceResolver: new XmlFileResolver(
+                        context.FileSystem.RootPath.FullPath == NormalizedPath.Slash ? null : context.FileSystem.RootPath.FullPath)));
 
             // Add the input source and references
             List<ISymbol> symbols = new List<ISymbol>();