fix: directory with forward slash exists on windows

.gitignore

@@ -1,6 +1,6 @@
 # Ignore the test.settings.json as it should reflect the individual developer experience.
 # > https://github.com/Testably/Testably.Abstractions/blob/main/CONTRIBUTING.md#tests
-/test.settings.json
+/Tests/test.settings.json
 
 # Set up Visual Studio to use WSL to execute unit tests in Ubuntu:
 # https://learn.microsoft.com/en-us/visualstudio/test/remote-testing

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

@@ -32,7 +32,11 @@ public override string GetFullPath(string path)
 			string candidate;
 			if (!string.IsNullOrEmpty(pathRoot) && !string.IsNullOrEmpty(directoryRoot))
 			{
-				if (char.ToUpperInvariant(pathRoot[0]) != char.ToUpperInvariant(directoryRoot[0]))
+				if (pathRoot[0] == DirectorySeparatorChar && pathRoot.Length == 1)
+				{
+					candidate = directoryRoot + path.Substring(1);
+				}
+				else if (char.ToUpperInvariant(pathRoot[0]) != char.ToUpperInvariant(directoryRoot[0]))
 				{
 					candidate = path;
 				}

Testably.Abstractions.sln.DotSettings

@@ -446,6 +446,7 @@
 	<s:String x:Key="/Default/CodeStyle/Generate/=Overrides/Options/=Mutable/@EntryIndexedValue">False</s:String>
 	<s:Boolean x:Key="/Default/CodeStyle/Naming/CSharpAutoNaming/IsNotificationDisabled/@EntryValue">True</s:Boolean>
 	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=OS/@EntryIndexedValue">OS</s:String>
+	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=UNC/@EntryIndexedValue">UNC</s:String>
 	<s:Boolean x:Key="/Default/Environment/SettingsMigration/IsMigratorApplied/=JetBrains_002EReSharper_002EPsi_002ECSharp_002ECodeStyle_002ECSharpAttributeForSingleLineMethodUpgrade/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/Environment/SettingsMigration/IsMigratorApplied/=JetBrains_002EReSharper_002EPsi_002ECSharp_002ECodeStyle_002ECSharpKeepExistingMigration/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/Environment/SettingsMigration/IsMigratorApplied/=JetBrains_002EReSharper_002EPsi_002ECSharp_002ECodeStyle_002ECSharpPlaceEmbeddedOnSameLineMigration/@EntryIndexedValue">True</s:Boolean>

Tests/Testably.Abstractions.Tests/FileSystem/Directory/ExistsTests.cs

@@ -26,6 +26,26 @@ public void Exists_File_ShouldReturnFalse(string path)
 		result.Should().BeFalse();
 	}
 
+	[Fact]
+	public void Exists_ForwardSlash_ShouldReturnTrue()
+	{
+		FileSystem.InitializeIn("D:");
+
+		bool result = FileSystem.Directory.Exists("/");
+
+		result.Should().BeTrue();
+	}
+
+	[Fact]
+	public void Exists_ForwardSlashWithDirectory_ShouldReturnTrue()
+	{
+		FileSystem.Directory.CreateDirectory("/tmp");
+
+		bool result = FileSystem.Directory.Exists("/tmp");
+
+		result.Should().BeTrue();
+	}
+
 	[Theory]
 	[InlineData(@"\\s")]
 	[InlineData("<")]

Tests/Testably.Abstractions.Tests/FileSystem/DirectoryInfo/ExistsTests.cs

@@ -36,6 +36,16 @@ public void Exists_File_ShouldReturnFalse(string path)
 		sut.Exists.Should().BeFalse();
 	}
 
+	[Fact]
+	public void Exists_ForwardSlash_ShouldReturnTrue()
+	{
+		FileSystem.InitializeIn("D:");
+
+		IDirectoryInfo sut = FileSystem.DirectoryInfo.New("/");
+
+		sut.Exists.Should().BeTrue();
+	}
+
 	[Theory]
 	[AutoData]
 	public void Exists_NotExistedPreviously_ShouldOnlyUpdateOnInitialization(string path)