From d88cb70b4be8196129e4535e3fc31e2a73717525 Mon Sep 17 00:00:00 2001
From: Philippe Matray <phmatray@gmail.com>
Date: Sat, 11 Mar 2023 20:55:50 +0100
Subject: [PATCH] Add some unit tests

---
 ...tDirectories(Func_IDirectoryNode,bool_).md | 21 +++++++
 docs/api/IVirtualFileSystem.md                |  1 +
 ...tDirectories(Func_IDirectoryNode,bool_).md | 23 ++++++++
 docs/api/VFS.md                               |  1 +
 docs/api/VirtualFileSystem.md                 |  2 +
 docs/links                                    |  2 +
 .../Abstractions/VFSPath.cs                   |  3 -
 .../Contracts/IVirtualFileSystem.cs           |  8 +++
 .../VFS.Commands.cs                           | 16 +-----
 .../VFS.Queries.cs                            |  4 +-
 .../Models/VirtualFileSystemTests.cs          | 55 +++++++++++++++++++
 .../ValueObjects/VFSPathTests.cs              | 51 +++++++++++++++++
 12 files changed, 168 insertions(+), 19 deletions(-)
 create mode 100644 docs/api/IVirtualFileSystem.SelectDirectories(Func_IDirectoryNode,bool_).md
 create mode 100644 docs/api/VFS.SelectDirectories(Func_IDirectoryNode,bool_).md
 create mode 100644 tests/Atypical.VirtualFileSystem.UnitTests/ValueObjects/VFSPathTests.cs

diff --git a/docs/api/IVirtualFileSystem.SelectDirectories(Func_IDirectoryNode,bool_).md b/docs/api/IVirtualFileSystem.SelectDirectories(Func_IDirectoryNode,bool_).md
new file mode 100644
index 0000000..33bb071
--- /dev/null
+++ b/docs/api/IVirtualFileSystem.SelectDirectories(Func_IDirectoryNode,bool_).md
@@ -0,0 +1,21 @@
+#### [Atypical.VirtualFileSystem.Core](VirtualFileSystem.md 'VirtualFileSystem')
+### [Atypical.VirtualFileSystem.Core.Contracts](VirtualFileSystem.md#Atypical.VirtualFileSystem.Core.Contracts 'Atypical.VirtualFileSystem.Core.Contracts').[IVirtualFileSystem](IVirtualFileSystem.md 'Atypical.VirtualFileSystem.Core.Contracts.IVirtualFileSystem')
+
+## IVirtualFileSystem.SelectDirectories(Func<IDirectoryNode,bool>) Method
+
+Finds all directory nodes that match the specified predicate.
+
+```csharp
+System.Collections.Generic.IEnumerable<Atypical.VirtualFileSystem.Core.Contracts.IDirectoryNode> SelectDirectories(System.Func<Atypical.VirtualFileSystem.Core.Contracts.IDirectoryNode,bool> predicate);
+```
+#### Parameters
+
+<a name='Atypical.VirtualFileSystem.Core.Contracts.IVirtualFileSystem.SelectDirectories(System.Func_Atypical.VirtualFileSystem.Core.Contracts.IDirectoryNode,bool_).predicate'></a>
+
+`predicate` [System.Func&lt;](https://docs.microsoft.com/en-us/dotnet/api/System.Func-2 'System.Func`2')[IDirectoryNode](IDirectoryNode.md 'Atypical.VirtualFileSystem.Core.Contracts.IDirectoryNode')[,](https://docs.microsoft.com/en-us/dotnet/api/System.Func-2 'System.Func`2')[System.Boolean](https://docs.microsoft.com/en-us/dotnet/api/System.Boolean 'System.Boolean')[&gt;](https://docs.microsoft.com/en-us/dotnet/api/System.Func-2 'System.Func`2')
+
+The predicate.
+
+#### Returns
+[System.Collections.Generic.IEnumerable&lt;](https://docs.microsoft.com/en-us/dotnet/api/System.Collections.Generic.IEnumerable-1 'System.Collections.Generic.IEnumerable`1')[IDirectoryNode](IDirectoryNode.md 'Atypical.VirtualFileSystem.Core.Contracts.IDirectoryNode')[&gt;](https://docs.microsoft.com/en-us/dotnet/api/System.Collections.Generic.IEnumerable-1 'System.Collections.Generic.IEnumerable`1')  
+The directory nodes.
\ No newline at end of file
diff --git a/docs/api/IVirtualFileSystem.md b/docs/api/IVirtualFileSystem.md
index 6cb4d91..72e1c39 100644
--- a/docs/api/IVirtualFileSystem.md
+++ b/docs/api/IVirtualFileSystem.md
@@ -39,6 +39,7 @@ Derived
 | [GetFile(string)](IVirtualFileSystem.GetFile(string).md 'Atypical.VirtualFileSystem.Core.Contracts.IVirtualFileSystem.GetFile(string)') | Gets a file node by its path.<br/>The path must be absolute. |
 | [GetRootPath()](IVirtualFileSystem.GetRootPath().md 'Atypical.VirtualFileSystem.Core.Contracts.IVirtualFileSystem.GetRootPath()') | Gets the path of the root directory. |
 | [IsEmpty()](IVirtualFileSystem.IsEmpty().md 'Atypical.VirtualFileSystem.Core.Contracts.IVirtualFileSystem.IsEmpty()') | Indicates whether the file system is empty.<br/>This is the case if the root directory is empty. |
+| [SelectDirectories(Func&lt;IDirectoryNode,bool&gt;)](IVirtualFileSystem.SelectDirectories(Func_IDirectoryNode,bool_).md 'Atypical.VirtualFileSystem.Core.Contracts.IVirtualFileSystem.SelectDirectories(System.Func<Atypical.VirtualFileSystem.Core.Contracts.IDirectoryNode,bool>)') | Finds all directory nodes that match the specified predicate. |
 | [TryGetDirectory(VFSDirectoryPath, IDirectoryNode)](IVirtualFileSystem.TryGetDirectory(VFSDirectoryPath,IDirectoryNode).md 'Atypical.VirtualFileSystem.Core.Contracts.IVirtualFileSystem.TryGetDirectory(Atypical.VirtualFileSystem.Core.ValueObjects.VFSDirectoryPath, Atypical.VirtualFileSystem.Core.Contracts.IDirectoryNode)') | Try to get a directory node by its path.<br/>The path must be absolute.<br/>If the directory node does not exist, this method returns `false`<br/>and [directory](IVirtualFileSystem.TryGetDirectory(VFSDirectoryPath,IDirectoryNode).md#Atypical.VirtualFileSystem.Core.Contracts.IVirtualFileSystem.TryGetDirectory(Atypical.VirtualFileSystem.Core.ValueObjects.VFSDirectoryPath,Atypical.VirtualFileSystem.Core.Contracts.IDirectoryNode).directory 'Atypical.VirtualFileSystem.Core.Contracts.IVirtualFileSystem.TryGetDirectory(Atypical.VirtualFileSystem.Core.ValueObjects.VFSDirectoryPath, Atypical.VirtualFileSystem.Core.Contracts.IDirectoryNode).directory') is set to `null`. |
 | [TryGetDirectory(string, IDirectoryNode)](IVirtualFileSystem.TryGetDirectory(string,IDirectoryNode).md 'Atypical.VirtualFileSystem.Core.Contracts.IVirtualFileSystem.TryGetDirectory(string, Atypical.VirtualFileSystem.Core.Contracts.IDirectoryNode)') | Try to get a directory node by its path.<br/>The path must be absolute.<br/>If the directory node does not exist, this method returns `false`<br/>and [directory](IVirtualFileSystem.TryGetDirectory(string,IDirectoryNode).md#Atypical.VirtualFileSystem.Core.Contracts.IVirtualFileSystem.TryGetDirectory(string,Atypical.VirtualFileSystem.Core.Contracts.IDirectoryNode).directory 'Atypical.VirtualFileSystem.Core.Contracts.IVirtualFileSystem.TryGetDirectory(string, Atypical.VirtualFileSystem.Core.Contracts.IDirectoryNode).directory') is set to `null`. |
 | [TryGetFile(VFSFilePath, IFileNode)](IVirtualFileSystem.TryGetFile(VFSFilePath,IFileNode).md 'Atypical.VirtualFileSystem.Core.Contracts.IVirtualFileSystem.TryGetFile(Atypical.VirtualFileSystem.Core.ValueObjects.VFSFilePath, Atypical.VirtualFileSystem.Core.Contracts.IFileNode)') | Try to get a file node by its path.<br/>The path must be absolute. |
diff --git a/docs/api/VFS.SelectDirectories(Func_IDirectoryNode,bool_).md b/docs/api/VFS.SelectDirectories(Func_IDirectoryNode,bool_).md
new file mode 100644
index 0000000..f39f61a
--- /dev/null
+++ b/docs/api/VFS.SelectDirectories(Func_IDirectoryNode,bool_).md
@@ -0,0 +1,23 @@
+#### [Atypical.VirtualFileSystem.Core](VirtualFileSystem.md 'VirtualFileSystem')
+### [Atypical.VirtualFileSystem.Core](VirtualFileSystem.md#Atypical.VirtualFileSystem.Core 'Atypical.VirtualFileSystem.Core').[VFS](VFS.md 'Atypical.VirtualFileSystem.Core.VFS')
+
+## VFS.SelectDirectories(Func<IDirectoryNode,bool>) Method
+
+Finds all directory nodes that match the specified predicate.
+
+```csharp
+public System.Collections.Generic.IEnumerable<Atypical.VirtualFileSystem.Core.Contracts.IDirectoryNode> SelectDirectories(System.Func<Atypical.VirtualFileSystem.Core.Contracts.IDirectoryNode,bool> predicate);
+```
+#### Parameters
+
+<a name='Atypical.VirtualFileSystem.Core.VFS.SelectDirectories(System.Func_Atypical.VirtualFileSystem.Core.Contracts.IDirectoryNode,bool_).predicate'></a>
+
+`predicate` [System.Func&lt;](https://docs.microsoft.com/en-us/dotnet/api/System.Func-2 'System.Func`2')[IDirectoryNode](IDirectoryNode.md 'Atypical.VirtualFileSystem.Core.Contracts.IDirectoryNode')[,](https://docs.microsoft.com/en-us/dotnet/api/System.Func-2 'System.Func`2')[System.Boolean](https://docs.microsoft.com/en-us/dotnet/api/System.Boolean 'System.Boolean')[&gt;](https://docs.microsoft.com/en-us/dotnet/api/System.Func-2 'System.Func`2')
+
+The predicate.
+
+Implements [SelectDirectories(Func&lt;IDirectoryNode,bool&gt;)](IVirtualFileSystem.SelectDirectories(Func_IDirectoryNode,bool_).md 'Atypical.VirtualFileSystem.Core.Contracts.IVirtualFileSystem.SelectDirectories(System.Func<Atypical.VirtualFileSystem.Core.Contracts.IDirectoryNode,bool>)')
+
+#### Returns
+[System.Collections.Generic.IEnumerable&lt;](https://docs.microsoft.com/en-us/dotnet/api/System.Collections.Generic.IEnumerable-1 'System.Collections.Generic.IEnumerable`1')[IDirectoryNode](IDirectoryNode.md 'Atypical.VirtualFileSystem.Core.Contracts.IDirectoryNode')[&gt;](https://docs.microsoft.com/en-us/dotnet/api/System.Collections.Generic.IEnumerable-1 'System.Collections.Generic.IEnumerable`1')  
+The directory nodes.
\ No newline at end of file
diff --git a/docs/api/VFS.md b/docs/api/VFS.md
index b2d61d7..e39628a 100644
--- a/docs/api/VFS.md
+++ b/docs/api/VFS.md
@@ -45,6 +45,7 @@ Implements [IVirtualFileSystem](IVirtualFileSystem.md 'Atypical.VirtualFileSyste
 | [GetFile(string)](VFS.GetFile(string).md 'Atypical.VirtualFileSystem.Core.VFS.GetFile(string)') | Gets a file node by its path.<br/>The path must be absolute. |
 | [GetRootPath()](VFS.GetRootPath().md 'Atypical.VirtualFileSystem.Core.VFS.GetRootPath()') | Gets the path of the root directory. |
 | [IsEmpty()](VFS.IsEmpty().md 'Atypical.VirtualFileSystem.Core.VFS.IsEmpty()') | Indicates whether the file system is empty.<br/>This is the case if the root directory is empty. |
+| [SelectDirectories(Func&lt;IDirectoryNode,bool&gt;)](VFS.SelectDirectories(Func_IDirectoryNode,bool_).md 'Atypical.VirtualFileSystem.Core.VFS.SelectDirectories(System.Func<Atypical.VirtualFileSystem.Core.Contracts.IDirectoryNode,bool>)') | Finds all directory nodes that match the specified predicate. |
 | [ToString()](VFS.ToString().md 'Atypical.VirtualFileSystem.Core.VFS.ToString()') | Returns the index as an ASCII tree. |
 | [TryGetDirectory(VFSDirectoryPath, IDirectoryNode)](VFS.TryGetDirectory(VFSDirectoryPath,IDirectoryNode).md 'Atypical.VirtualFileSystem.Core.VFS.TryGetDirectory(Atypical.VirtualFileSystem.Core.ValueObjects.VFSDirectoryPath, Atypical.VirtualFileSystem.Core.Contracts.IDirectoryNode)') | Try to get a directory node by its path.<br/>The path must be absolute.<br/>If the directory node does not exist, this method returns `false`<br/>and [directory](VFS.TryGetDirectory(VFSDirectoryPath,IDirectoryNode).md#Atypical.VirtualFileSystem.Core.VFS.TryGetDirectory(Atypical.VirtualFileSystem.Core.ValueObjects.VFSDirectoryPath,Atypical.VirtualFileSystem.Core.Contracts.IDirectoryNode).directory 'Atypical.VirtualFileSystem.Core.VFS.TryGetDirectory(Atypical.VirtualFileSystem.Core.ValueObjects.VFSDirectoryPath, Atypical.VirtualFileSystem.Core.Contracts.IDirectoryNode).directory') is set to `null`. |
 | [TryGetDirectory(string, IDirectoryNode)](VFS.TryGetDirectory(string,IDirectoryNode).md 'Atypical.VirtualFileSystem.Core.VFS.TryGetDirectory(string, Atypical.VirtualFileSystem.Core.Contracts.IDirectoryNode)') | Try to get a directory node by its path.<br/>The path must be absolute.<br/>If the directory node does not exist, this method returns `false`<br/>and [directory](VFS.TryGetDirectory(string,IDirectoryNode).md#Atypical.VirtualFileSystem.Core.VFS.TryGetDirectory(string,Atypical.VirtualFileSystem.Core.Contracts.IDirectoryNode).directory 'Atypical.VirtualFileSystem.Core.VFS.TryGetDirectory(string, Atypical.VirtualFileSystem.Core.Contracts.IDirectoryNode).directory') is set to `null`. |
diff --git a/docs/api/VirtualFileSystem.md b/docs/api/VirtualFileSystem.md
index a653b3f..d16aac9 100644
--- a/docs/api/VirtualFileSystem.md
+++ b/docs/api/VirtualFileSystem.md
@@ -46,6 +46,7 @@
   - **[GetRootPath()](VFS.GetRootPath().md 'Atypical.VirtualFileSystem.Core.VFS.GetRootPath()')** `Method` Gets the path of the root directory.
   - **[IsEmpty()](VFS.IsEmpty().md 'Atypical.VirtualFileSystem.Core.VFS.IsEmpty()')** `Method` Indicates whether the file system is empty.  
     This is the case if the root directory is empty.
+  - **[SelectDirectories(Func&lt;IDirectoryNode,bool&gt;)](VFS.SelectDirectories(Func_IDirectoryNode,bool_).md 'Atypical.VirtualFileSystem.Core.VFS.SelectDirectories(System.Func<Atypical.VirtualFileSystem.Core.Contracts.IDirectoryNode,bool>)')** `Method` Finds all directory nodes that match the specified predicate.
   - **[ToString()](VFS.ToString().md 'Atypical.VirtualFileSystem.Core.VFS.ToString()')** `Method` Returns the index as an ASCII tree.
   - **[TryGetDirectory(VFSDirectoryPath, IDirectoryNode)](VFS.TryGetDirectory(VFSDirectoryPath,IDirectoryNode).md 'Atypical.VirtualFileSystem.Core.VFS.TryGetDirectory(Atypical.VirtualFileSystem.Core.ValueObjects.VFSDirectoryPath, Atypical.VirtualFileSystem.Core.Contracts.IDirectoryNode)')** `Method` Try to get a directory node by its path.  
     The path must be absolute.  
@@ -175,6 +176,7 @@
   - **[GetRootPath()](IVirtualFileSystem.GetRootPath().md 'Atypical.VirtualFileSystem.Core.Contracts.IVirtualFileSystem.GetRootPath()')** `Method` Gets the path of the root directory.
   - **[IsEmpty()](IVirtualFileSystem.IsEmpty().md 'Atypical.VirtualFileSystem.Core.Contracts.IVirtualFileSystem.IsEmpty()')** `Method` Indicates whether the file system is empty.  
     This is the case if the root directory is empty.
+  - **[SelectDirectories(Func&lt;IDirectoryNode,bool&gt;)](IVirtualFileSystem.SelectDirectories(Func_IDirectoryNode,bool_).md 'Atypical.VirtualFileSystem.Core.Contracts.IVirtualFileSystem.SelectDirectories(System.Func<Atypical.VirtualFileSystem.Core.Contracts.IDirectoryNode,bool>)')** `Method` Finds all directory nodes that match the specified predicate.
   - **[TryGetDirectory(VFSDirectoryPath, IDirectoryNode)](IVirtualFileSystem.TryGetDirectory(VFSDirectoryPath,IDirectoryNode).md 'Atypical.VirtualFileSystem.Core.Contracts.IVirtualFileSystem.TryGetDirectory(Atypical.VirtualFileSystem.Core.ValueObjects.VFSDirectoryPath, Atypical.VirtualFileSystem.Core.Contracts.IDirectoryNode)')** `Method` Try to get a directory node by its path.  
     The path must be absolute.  
     If the directory node does not exist, this method returns `false`  
diff --git a/docs/links b/docs/links
index 8bda2ed..60b162b 100644
--- a/docs/links
+++ b/docs/links
@@ -19,6 +19,7 @@ M:Atypical.VirtualFileSystem.Core.VFS.TryGetDirectory(Atypical.VirtualFileSystem
 M:Atypical.VirtualFileSystem.Core.VFS.TryGetDirectory(System.String,Atypical.VirtualFileSystem.Core.Contracts.IDirectoryNode@)|VFS.TryGetDirectory(string,IDirectoryNode).md|TryGetDirectory(string, IDirectoryNode)
 M:Atypical.VirtualFileSystem.Core.VFS.FindDirectories|VFS.FindDirectories().md|FindDirectories()
 M:Atypical.VirtualFileSystem.Core.VFS.FindDirectories(System.Text.RegularExpressions.Regex)|VFS.FindDirectories(Regex).md|FindDirectories(Regex)
+M:Atypical.VirtualFileSystem.Core.VFS.SelectDirectories(System.Func{Atypical.VirtualFileSystem.Core.Contracts.IDirectoryNode,System.Boolean})|VFS.SelectDirectories(Func_IDirectoryNode,bool_).md|SelectDirectories(Func<IDirectoryNode,bool>)
 M:Atypical.VirtualFileSystem.Core.VFS.GetFile(Atypical.VirtualFileSystem.Core.ValueObjects.VFSFilePath)|VFS.GetFile(VFSFilePath).md|GetFile(VFSFilePath)
 M:Atypical.VirtualFileSystem.Core.VFS.GetFile(System.String)|VFS.GetFile(string).md|GetFile(string)
 M:Atypical.VirtualFileSystem.Core.VFS.TryGetFile(Atypical.VirtualFileSystem.Core.ValueObjects.VFSFilePath,Atypical.VirtualFileSystem.Core.Contracts.IFileNode@)|VFS.TryGetFile(VFSFilePath,IFileNode).md|TryGetFile(VFSFilePath, IFileNode)
@@ -102,6 +103,7 @@ M:Atypical.VirtualFileSystem.Core.Contracts.IVirtualFileSystem.CreateDirectory(S
 M:Atypical.VirtualFileSystem.Core.Contracts.IVirtualFileSystem.DeleteDirectory(Atypical.VirtualFileSystem.Core.ValueObjects.VFSDirectoryPath)|IVirtualFileSystem.DeleteDirectory(VFSDirectoryPath).md|DeleteDirectory(VFSDirectoryPath)
 M:Atypical.VirtualFileSystem.Core.Contracts.IVirtualFileSystem.DeleteDirectory(System.String)|IVirtualFileSystem.DeleteDirectory(string).md|DeleteDirectory(string)
 M:Atypical.VirtualFileSystem.Core.Contracts.IVirtualFileSystem.FindDirectories|IVirtualFileSystem.FindDirectories().md|FindDirectories()
+M:Atypical.VirtualFileSystem.Core.Contracts.IVirtualFileSystem.SelectDirectories(System.Func{Atypical.VirtualFileSystem.Core.Contracts.IDirectoryNode,System.Boolean})|IVirtualFileSystem.SelectDirectories(Func_IDirectoryNode,bool_).md|SelectDirectories(Func<IDirectoryNode,bool>)
 M:Atypical.VirtualFileSystem.Core.Contracts.IVirtualFileSystem.FindDirectories(System.Text.RegularExpressions.Regex)|IVirtualFileSystem.FindDirectories(Regex).md|FindDirectories(Regex)
 M:Atypical.VirtualFileSystem.Core.Contracts.IVirtualFileSystem.GetFile(Atypical.VirtualFileSystem.Core.ValueObjects.VFSFilePath)|IVirtualFileSystem.GetFile(VFSFilePath).md|GetFile(VFSFilePath)
 M:Atypical.VirtualFileSystem.Core.Contracts.IVirtualFileSystem.GetFile(System.String)|IVirtualFileSystem.GetFile(string).md|GetFile(string)
diff --git a/src/Atypical.VirtualFileSystem.Core/Abstractions/VFSPath.cs b/src/Atypical.VirtualFileSystem.Core/Abstractions/VFSPath.cs
index 3571af6..9910598 100644
--- a/src/Atypical.VirtualFileSystem.Core/Abstractions/VFSPath.cs
+++ b/src/Atypical.VirtualFileSystem.Core/Abstractions/VFSPath.cs
@@ -22,8 +22,6 @@ public abstract record VFSPath
     /// </summary>
     public static readonly Regex VFSPathRegex = new(VFSPathRegexPattern, RegexOptions.Compiled);
 
-
-    
     /// <summary>
     ///     Creates a new instance of <see cref="VFSPath" />.
     /// </summary>
@@ -130,7 +128,6 @@ public string Name {
     public virtual bool Equals(VFSPath? other)
     {
         if (ReferenceEquals(null, other)) return false;
-        if (ReferenceEquals(this, other)) return true;
         return Value == other.Value;
     }
 
diff --git a/src/Atypical.VirtualFileSystem.Core/Contracts/IVirtualFileSystem.cs b/src/Atypical.VirtualFileSystem.Core/Contracts/IVirtualFileSystem.cs
index 2d69493..f25388e 100644
--- a/src/Atypical.VirtualFileSystem.Core/Contracts/IVirtualFileSystem.cs
+++ b/src/Atypical.VirtualFileSystem.Core/Contracts/IVirtualFileSystem.cs
@@ -114,6 +114,14 @@ public interface IVirtualFileSystem
     /// <returns>The directory nodes.</returns>
     IEnumerable<IDirectoryNode> FindDirectories();
 
+    /// <summary>
+    ///     Finds all directory nodes that match the specified predicate.
+    /// </summary>
+    /// <param name="predicate">The predicate.</param>
+    /// <returns>The directory nodes.</returns>
+    IEnumerable<IDirectoryNode> SelectDirectories(
+        Func<IDirectoryNode, bool> predicate);
+
     /// <summary>
     ///     Finds all directory nodes that match the specified regular expression.
     ///     The regular expression must be relative to the root directory.
diff --git a/src/Atypical.VirtualFileSystem.Core/VFS.Commands.cs b/src/Atypical.VirtualFileSystem.Core/VFS.Commands.cs
index 82cc8f4..0658975 100644
--- a/src/Atypical.VirtualFileSystem.Core/VFS.Commands.cs
+++ b/src/Atypical.VirtualFileSystem.Core/VFS.Commands.cs
@@ -8,9 +8,6 @@ public IVirtualFileSystem CreateDirectory(VFSDirectoryPath directoryPath)
         if (directoryPath.IsRoot)
             ThrowCannotCreateRootDirectory();
 
-        if (directoryPath.Parent == null)
-            ThrowCannotCreateDirectoryWithoutParent();
-        
         var directory = new DirectoryNode(directoryPath);
         this.AddToIndex(directory);
 
@@ -27,9 +24,10 @@ public IVirtualFileSystem CreateDirectory(string directoryPath)
     /// <inheritdoc cref="IVirtualFileSystem.DeleteDirectory(VFSDirectoryPath)" />
     public IVirtualFileSystem DeleteDirectory(VFSDirectoryPath directoryPath)
     {
+        // cannot delete the root directory
         if (directoryPath.IsRoot)
             ThrowCannotDeleteRootDirectory();
-
+        
         // try to get the directory
         var found = this.TryGetDirectory(directoryPath, out _);
         if (!found)
@@ -55,9 +53,6 @@ public IVirtualFileSystem DeleteDirectory(string directoryPath)
     /// <inheritdoc cref="IVirtualFileSystem.CreateFile(VFSFilePath,string?)" />
     public IVirtualFileSystem CreateFile(VFSFilePath filePath, string? content = null)
     {
-        if (filePath.Parent == null)
-            ThrowCannotCreateDirectoryWithoutParent();
-        
         var file = new FileNode(filePath, content);
         this.AddToIndex(file);
 
@@ -116,11 +111,4 @@ private static void ThrowCannotCreateRootDirectory()
         const string message = "Cannot create the root directory.";
         throw new VFSException(message);
     }
-
-    [DoesNotReturn]
-    private static void ThrowCannotCreateDirectoryWithoutParent()
-    {
-        const string message = "Cannot create a directory without a parent.";
-        throw new VFSException(message);
-    }
 }
\ No newline at end of file
diff --git a/src/Atypical.VirtualFileSystem.Core/VFS.Queries.cs b/src/Atypical.VirtualFileSystem.Core/VFS.Queries.cs
index b88185a..62af56c 100644
--- a/src/Atypical.VirtualFileSystem.Core/VFS.Queries.cs
+++ b/src/Atypical.VirtualFileSystem.Core/VFS.Queries.cs
@@ -48,9 +48,9 @@ public IEnumerable<IDirectoryNode> FindDirectories()
     /// <inheritdoc cref="IVirtualFileSystem.FindDirectories(Regex)" />
     public IEnumerable<IDirectoryNode> FindDirectories(
         Regex regexPattern)
-        => FindDirectories()
-            .Where(f => regexPattern.IsMatch(f.Path.Value));
+        => SelectDirectories(f => regexPattern.IsMatch(f.Path.Value));
     
+    /// <inheritdoc cref="IVirtualFileSystem.SelectDirectories(Func{IDirectoryNode,bool})" />
     public IEnumerable<IDirectoryNode> SelectDirectories(
         Func<IDirectoryNode, bool> predicate)
         => FindDirectories()
diff --git a/tests/Atypical.VirtualFileSystem.UnitTests/Models/VirtualFileSystemTests.cs b/tests/Atypical.VirtualFileSystem.UnitTests/Models/VirtualFileSystemTests.cs
index 3bd7dc7..41d82ec 100644
--- a/tests/Atypical.VirtualFileSystem.UnitTests/Models/VirtualFileSystemTests.cs
+++ b/tests/Atypical.VirtualFileSystem.UnitTests/Models/VirtualFileSystemTests.cs
@@ -212,6 +212,21 @@ public void CreateDirectory_throws_an_exception_if_the_path_is_not_a_directory()
                 .Throw<VFSException>()
                 .WithMessage("The directory path 'vfs://dir1/dir2/dir3/file.txt' contains a file extension.");
         }
+        
+        [Fact]
+        public void CreateDirectory_throws_an_exception_if_the_path_is_the_root_directory()
+        {
+            // Arrange
+            IVirtualFileSystem vfs = new VFS();
+
+            // Act
+            Action action = () => vfs.CreateDirectory("vfs://");
+
+            // Assert
+            action.Should()
+                .Throw<VFSException>()
+                .WithMessage("Cannot create the root directory.");
+        }
     }
 
     public class MethodDeleteDirectory
@@ -261,6 +276,21 @@ public void DeleteDirectory_throws_an_exception_if_the_directory_does_not_exist(
                 .Throw<VFSException>()
                 .WithMessage("The directory 'vfs://dir1' does not exist in the index.");
         }
+        
+        [Fact]
+        public void DeleteDirectory_throws_an_exception_if_the_path_is_the_root_directory()
+        {
+            // Arrange
+            IVirtualFileSystem vfs = new VFS();
+
+            // Act
+            Action action = () => vfs.DeleteDirectory("vfs://");
+
+            // Assert
+            action.Should()
+                .Throw<VFSException>()
+                .WithMessage("Cannot delete the root directory.");
+        }
     }
 
     public class MethodFindDirectories
@@ -305,6 +335,31 @@ public void FindDirectories_returns_all_directories_matching_a_pattern()
         }
     }
 
+    public class MethodSelectDirectories
+    {
+        [Fact]
+        public void SelectDirectories_returns_all_directories()
+        {
+            // Arrange
+            IVirtualFileSystem vfs = new VFS();
+            vfs.CreateDirectory("dir1");
+            vfs.CreateDirectory("dir2");
+            vfs.CreateDirectory("dir3");
+
+            // Act
+            var directories = vfs
+                .SelectDirectories(x => x.IsDirectory)
+                .ToList();
+
+            // Assert
+            directories.Should().NotBeEmpty();
+            directories.Should().HaveCount(3); // dir1 + dir2 + dir3
+            directories.Should().Contain(d => d.Path.Value == "vfs://dir1");
+            directories.Should().Contain(d => d.Path.Value == "vfs://dir2");
+            directories.Should().Contain(d => d.Path.Value == "vfs://dir3");
+        }
+    }
+
     public class MethodGetFile
     {
         [Fact]
diff --git a/tests/Atypical.VirtualFileSystem.UnitTests/ValueObjects/VFSPathTests.cs b/tests/Atypical.VirtualFileSystem.UnitTests/ValueObjects/VFSPathTests.cs
new file mode 100644
index 0000000..2f32b1c
--- /dev/null
+++ b/tests/Atypical.VirtualFileSystem.UnitTests/ValueObjects/VFSPathTests.cs
@@ -0,0 +1,51 @@
+using Atypical.VirtualFileSystem.Core.Abstractions;
+
+namespace VirtualFileSystem.UnitTests.ValueObjects;
+
+public class VFSPathTests
+{
+    public class Equality
+    {
+        [Fact]
+        public void Equals_returns_true_when_paths_are_equal()
+        {
+            // Arrange
+            VFSPath path1 = new VFSDirectoryPath("/path/to/file");
+            VFSPath path2 = new VFSDirectoryPath("/path/to/file");
+            
+            // Act
+            bool result = path1.Equals(path2);
+            
+            // Assert
+            Assert.True(result);
+        }
+        
+        [Fact]
+        public void Equals_returns_true_when_paths_are_the_same()
+        {
+            // Arrange
+            VFSPath path1 = new VFSDirectoryPath("/path/to/file");
+            VFSPath path2 = path1;
+            
+            // Act
+            bool result = path1.Equals(path2);
+            
+            // Assert
+            Assert.True(result);
+        }
+        
+        [Fact]
+        public void Equals_returns_false_when_paths_are_not_equal()
+        {
+            // Arrange
+            VFSPath path1 = new VFSDirectoryPath("/path/to/file");
+            VFSPath path2 = new VFSDirectoryPath("/path/to/directory");
+            
+            // Act
+            bool result = path1.Equals(path2);
+            
+            // Assert
+            Assert.False(result);
+        }
+    }
+}
\ No newline at end of file