fix: start implementing Path simulation (#564)

Implement
- AltDirectorySeparatorChar
- DirectorySeparatorChar
- PathSeparator
- VolumeSeparatorChar
- GetInvalidFileNameChars()
- GetInvalidPathChars()

Author: vbreuss

Source/Testably.Abstractions.Testing/Helpers/Execute.LinuxPath.cs

@@ -1,21 +1,45 @@
-using System.IO;
-#if FEATURE_SPAN
-using System;
-#endif
-
-namespace Testably.Abstractions.Testing.Helpers;
+namespace Testably.Abstractions.Testing.Helpers;
 
 internal partial class Execute
 {
-	private class LinuxPath(MockFileSystem fileSystem) : NativePath(fileSystem)
+	private class LinuxPath(MockFileSystem fileSystem) : SimulatedPath(fileSystem)
 	{
-#if FEATURE_SPAN
-		/// <inheritdoc cref="Path.IsPathRooted(ReadOnlySpan{char})" />
-		public override bool IsPathRooted(ReadOnlySpan<char> path)
-			=> IsPathRooted(path.ToString());
-#endif
+		/// <inheritdoc cref="IPath.AltDirectorySeparatorChar" />
+		public override char AltDirectorySeparatorChar => '/';
+
+		/// <inheritdoc cref="IPath.DirectorySeparatorChar" />
+		public override char DirectorySeparatorChar => '/';
+
+		/// <inheritdoc cref="IPath.PathSeparator" />
+		public override char PathSeparator => ':';
+
+		/// <inheritdoc cref="IPath.VolumeSeparatorChar" />
+		public override char VolumeSeparatorChar => '/';
+
+		/// <inheritdoc cref="IPath.GetInvalidFileNameChars()" />
+		public override char[] GetInvalidFileNameChars() => ['\0', '/'];
+
+		/// <inheritdoc cref="IPath.GetInvalidPathChars()" />
+		public override char[] GetInvalidPathChars() => ['\0'];
+
+		/// <inheritdoc cref="IPath.GetPathRoot(string?)" />
+		public override string? GetPathRoot(string? path)
+		{
+			if (string.IsNullOrEmpty(path))
+			{
+				return null;
+			}
+
+			return IsPathRooted(path)
+				? $"{DirectorySeparatorChar}"
+				: string.Empty;
+		}
+
+		/// <inheritdoc cref="IPath.GetTempPath()" />
+		public override string GetTempPath()
+			=> "/tmp/";
 
-		/// <inheritdoc cref="Path.IsPathRooted(string)" />
+		/// <inheritdoc cref="IPath.IsPathRooted(string)" />
 		public override bool IsPathRooted(string? path)
 			=> path?.Length > 0 && path[0] == '/';
 	}

Source/Testably.Abstractions.Testing/Helpers/Execute.MacPath.cs

@@ -1,10 +1,4 @@
-#if FEATURE_SPAN
-#endif
-#if FEATURE_FILESYSTEM_NET7
-using Testably.Abstractions.Testing.Storage;
-#endif
-
-namespace Testably.Abstractions.Testing.Helpers;
+namespace Testably.Abstractions.Testing.Helpers;
 
 internal partial class Execute
 {

Source/Testably.Abstractions.Testing/Helpers/Execute.NativePath.cs

@@ -1,8 +1,8 @@
-#if FEATURE_SPAN
+using System.Diagnostics.CodeAnalysis;
+using System.IO;
+#if FEATURE_SPAN
 using System;
 #endif
-using System.Diagnostics.CodeAnalysis;
-using System.IO;
 #if FEATURE_FILESYSTEM_NET7
 using Testably.Abstractions.Testing.Storage;
 #endif
@@ -11,7 +11,7 @@ namespace Testably.Abstractions.Testing.Helpers;
 
 internal partial class Execute
 {
-	private class NativePath(MockFileSystem fileSystem) : IPath
+	private sealed class NativePath(MockFileSystem fileSystem) : IPath
 	{
 		#region IPath Members
 
@@ -228,12 +228,12 @@ public bool IsPathFullyQualified(string path)
 
 #if FEATURE_SPAN
 		/// <inheritdoc cref="Path.IsPathRooted(ReadOnlySpan{char})" />
-		public virtual bool IsPathRooted(ReadOnlySpan<char> path)
+		public bool IsPathRooted(ReadOnlySpan<char> path)
 			=> System.IO.Path.IsPathRooted(path);
 #endif
 
 		/// <inheritdoc cref="Path.IsPathRooted(string)" />
-		public virtual bool IsPathRooted(string? path)
+		public bool IsPathRooted(string? path)
 			=> System.IO.Path.IsPathRooted(path);
 
 #if FEATURE_PATH_JOIN