Moved method to hepers and added unit test for the helper method as per review suggestion

Author: timayabi2020

src/Authentication/Authentication.Test/Helpers/EncodeUriPathTests.cs

@@ -0,0 +1,26 @@
+
+using Xunit;
+using System;
+using Microsoft.Graph.PowerShell.Authentication.Helpers;
+
+namespace Microsoft.Graph.Authentication.Test.Helpers
+{
+    public class EncodeUriPathTests
+    {
+        private string url = "https://graph.microsoft.com/beta/users/first.last_foo.com#EXT#@contoso.onmicrosoft.com";
+        private string encodedUrl = "https://graph.microsoft.com/beta/users/first.last_foo.com%23EXT%23%40contoso.onmicrosoft.com";
+
+        [Fact]
+        public void ShouldReturnAnEncodedUriGivenAUrlWithSpecialCharactersInPathSegments()
+        {
+            //arrange
+            Uri uri = new Uri(url);
+
+            //act
+            Uri result = uri.EscapeDataStrings();
+
+            //assert
+            Assert.Equal(encodedUrl, result.ToString());
+        }
+    }
+}

src/Authentication/Authentication/Cmdlets/InvokeMgGraphRequest.cs

@@ -402,31 +402,7 @@ private Uri PrepareUri(HttpClient httpClient, Uri uri)
                 // set body to null to prevent later FillRequestStream
                 Body = null;
             }
-            return EscapeDataStrings(uriBuilder.Uri);
-        }
-
-        /// <summary>
-        /// Escape data string/url encode Uris that have paths containing special characters like #.
-        /// For a path like /beta/users/first.last_foo.com#EXT#@contoso.onmicrosoft.com, the last segment contains special characters that need to be escaped
-        /// </summary>
-        /// <param name="uri"></param>
-        /// <returns></returns>
-        private Uri EscapeDataStrings(Uri uri)
-        {
-            int counter = 0;
-            var pathSegments = uri.OriginalString.Split('/');
-            StringBuilder sb = new StringBuilder();
-            foreach (var segment in pathSegments)
-            {
-                //Skips the left part of the uri i.e https://graph.microsoft.com
-                if (counter > 2)
-                {
-                    sb.Append("/" + Uri.EscapeDataString(segment));
-                }
-                counter++;
-            }
-            Uri escapedUri = new Uri(uri.GetLeftPart(UriPartial.Authority) + sb.ToString());
-            return escapedUri;
+            return uriBuilder.Uri.EscapeDataStrings();
         }
 
         private void ThrowIfError(ErrorRecord error)

src/Authentication/Authentication/Helpers/EncodeUriPath.cs

@@ -0,0 +1,34 @@
+// ------------------------------------------------------------------------------
+//  Copyright (c) Microsoft Corporation.  All Rights Reserved.  Licensed under the MIT License.  See License in the project root for license information.
+// ------------------------------------------------------------------------------
+
+using System;
+using System.Text;
+
+namespace Microsoft.Graph.PowerShell.Authentication.Helpers
+{
+    /// <summary>
+    /// Escape data string/url encode Uris that have paths containing special characters like #.
+    /// For a path like /beta/users/first.last_foo.com#EXT#@contoso.onmicrosoft.com, the last segment contains special characters that need to be escaped
+    /// </summary>
+    public static class EncodeUriPaths
+    {
+        public static Uri EscapeDataStrings(this Uri uri)
+        {
+            int counter = 0;
+            var pathSegments = uri.OriginalString.Split('/');
+            StringBuilder sb = new StringBuilder();
+            foreach (var segment in pathSegments)
+            {
+                //Skips the left part of the uri i.e https://graph.microsoft.com
+                if (counter > 2)
+                {
+                    sb.Append("/" + Uri.EscapeDataString(segment));
+                }
+                counter++;
+            }
+            Uri escapedUri = new Uri(uri.GetLeftPart(UriPartial.Authority) + sb.ToString());
+            return escapedUri;
+        }
+    }
+}