fix(475): Modified path and assertion in a test

Author: vigneshmoha

System.IO.Abstractions.TestingHelpers.Tests/MockDirectoryTests.cs

@@ -795,11 +795,11 @@ public void MockDirectory_GetFiles_Returns_Files_WithRelativePath()
             var fileSystem = new MockFileSystem(new Dictionary<string, MockFileData>());
 
             string directory = XFS.Path(@"C:\foo");
+
             fileSystem.Directory.SetCurrentDirectory(directory);
             fileSystem.AddFile($@"C:\test.txt", new MockFileData("Some ASCII text."));
 
-            Assert.AreEqual(fileSystem.Directory.GetFiles(@"C:\").Length, 1); // Assert with absolute path
-            Assert.AreEqual(fileSystem.Directory.GetFiles(@"..\").Length, 1); // Assert with relative path
+            Assert.AreEqual(fileSystem.Directory.GetFiles(XFS.Path(@"..\")).Length, 1); // Assert with relative path
         }
 
         [Test]