fix(475): Fixed an issue with Mock file system directory Get Files when we use relative path.

Author: vigneshmoha

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

@@ -788,6 +788,20 @@ public void MockDirectory_GetFiles_Returns_Files()
             Assert.AreEqual(testPath, entries.First());
         }
 
+        [Test]
+        public void MockDirectory_GetFiles_Returns_Files_WithRelativePath()
+        {
+            // arrange
+            var fileSystem = new MockFileSystem(new Dictionary<string, MockFileData>());
+
+            const string dir = @"C:\foo";
+            fileSystem.Directory.SetCurrentDirectory(dir);
+            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
+        }
+
         [Test]
         public void MockDirectory_GetFiles_ShouldThrowAnArgumentNullException_IfSearchPatternIsNull()
         {

System.IO.Abstractions.TestingHelpers/MockDirectory.cs

@@ -212,14 +212,13 @@ private string[] GetFilesInternal(
             CheckSearchPattern(searchPattern);
             path = path.TrimSlashes();
             path = path.NormalizeSlashes();
+            path = mockFileDataAccessor.Path.GetFullPath(path);
 
             if (!Exists(path))
             {
                 throw CommonExceptions.CouldNotFindPartOfPath(path);
             }
 
-            path = EnsureAbsolutePath(path);
-
             if (!path.EndsWith(Path.DirectorySeparatorChar.ToString()))
             {
                 path += Path.DirectorySeparatorChar;