Added IDirectory

ProcessFiles/Interfaces/IDirectory.cs

@@ -0,0 +1,7 @@
+namespace ProcessFiles.Interfaces
+{
+    public interface IDirectory
+    {
+        public bool Exists(string? path);
+    }
+}

ProcessFiles/Interfaces/IFileSystem.cs

@@ -3,5 +3,6 @@
     public interface IFileSystem
     {
         public IFile File { get; }
+        public IDirectory Directory { get; }
     }
 }

ProcessFiles/Models/DefaultDirectory.cs

@@ -0,0 +1,10 @@
+using ProcessFiles.Interfaces;
+using System.IO;
+
+namespace ProcessFiles.Models
+{
+    public class DefaultDirectory : IDirectory
+    {
+        public bool Exists(string? path) => Directory.Exists(path);
+    }
+}

ProcessFiles/Models/DefaultFileSystem.cs

@@ -6,5 +6,8 @@ namespace ProcessFiles.Models
     {
         private readonly IFile file = new DefaultFile();
         public IFile File => file;
+
+        private readonly IDirectory directory = new DefaultDirectory();
+        public IDirectory Directory => directory;
     }
 }

ProcessFiles/ProcessFiles.cs

@@ -93,7 +93,7 @@ namespace ProcessFiles
 
         private void ProcessDir(string path, string[] fileExtensions, Action<string> action, bool recursive = false)
         {
-            if (!Directory.Exists(path))
+            if (!fileSystem.Directory.Exists(path))
             {
                 errors.Add($"{path} doesn't exist!");
                 return;