Implement MockDirectoryInfo.GetFileSystemInfos methods

TestHelpers.Tests/MockDirectoryInfoTests.cs

@@ -65,5 +65,36 @@ public void MockDirectoryInfo_FullName_ShouldReturnFullNameIncludingTrailingPath
 
             Assert.That(result, Is.EqualTo(@"c:\temp\folder\"));
         }
+
+        [Test]
+        public void MockDirectoryInfo_GetFileSystemInfos_ShouldReturnBothDirectoriesAndFiles()
+        {
+            var fileSystem = new MockFileSystem(new Dictionary<string, MockFileData>
+            {
+                { @"c:\temp\folder\file.txt", new MockFileData("Hello World") },
+                { @"c:\temp\folder\folder", new MockDirectoryData() }
+            });
+
+            var directoryInfo = new MockDirectoryInfo(fileSystem, @"c:\temp\folder");
+            var result = directoryInfo.GetFileSystemInfos();
+
+            Assert.That(result.Length, Is.EqualTo(2));
+        }
+
+        [Test]
+        public void MockDirectoryInfo_GetFileSystemInfos_ShouldReturnDirectoriesAndNamesWithSearchPattern()
+        {
+            var fileSystem = new MockFileSystem(new Dictionary<string, MockFileData>
+            {
+                { @"c:\temp\folder\file.txt", new MockFileData("Hello World") },
+                { @"c:\temp\folder\folder", new MockDirectoryData() },
+                { @"c:\temp\folder\older", new MockDirectoryData() }
+            });
+
+            var directoryInfo = new MockDirectoryInfo(fileSystem, @"c:\temp\folder");
+            var result = directoryInfo.GetFileSystemInfos("f*");
+
+            Assert.That(result.Length, Is.EqualTo(2));
+        }
     }
 }

TestingHelpers/MockDirectoryInfo.cs

@@ -189,12 +189,17 @@ FileInfoBase[] ConvertStringsToFiles(IEnumerable<string> paths)
 
         public override FileSystemInfoBase[] GetFileSystemInfos()
         {
-            throw new NotImplementedException("This test helper hasn't been implemented yet. They are implemented on an as-needed basis. As it seems like you need it, now would be a great time to send us a pull request over at https://github.com/tathamoddie/System.IO.Abstractions. You know, because it's open source and all.");
+            return GetFileSystemInfos("*");
         }
 
         public override FileSystemInfoBase[] GetFileSystemInfos(string searchPattern)
         {
-            throw new NotImplementedException("This test helper hasn't been implemented yet. They are implemented on an as-needed basis. As it seems like you need it, now would be a great time to send us a pull request over at https://github.com/tathamoddie/System.IO.Abstractions. You know, because it's open source and all.");
+            return GetFileSystemInfos(searchPattern, SearchOption.TopDirectoryOnly);
+        }
+
+        internal FileSystemInfoBase[] GetFileSystemInfos(string searchPattern, SearchOption searchOption)
+        {
+            return this.GetDirectories(searchPattern, searchOption).OfType<FileSystemInfoBase>().Concat(this.GetFiles(searchPattern, searchOption)).ToArray();
         }
 
         public override void MoveTo(string destDirName)