Add File.renameSync() to virtual file system.

pkg/analyzer/test/file_system/memory_file_system_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library analyzer.test.file_system.memory_file_system_test;
 
 import 'dart:async';
 import 'dart:core' hide Resource;
 
 import 'package:analyzer/file_system/file_system.dart';
@@ skipping 130 matching lines @@
     expect(() {
       file.readAsStringSync();
     }, throwsA(_isFileSystemException));
   }
 
   void test_readAsStringSync_exists() {
     File file = provider.newFile('/file.txt', 'abc');
     expect(file.readAsStringSync(), 'abc');
   }
 
+  void test_renameSync_newDoesNotExist() {
+    String oldPath = '/foo/bar/file.txt';
+    String newPath = '/foo/bar/new-file.txt';
+    File file = provider.newFile(oldPath, 'text');
+    File newFile = file.renameSync(newPath);
+    expect(file.path, oldPath);
+    expect(file.exists, isFalse);
+    expect(newFile.path, newPath);
+    expect(newFile.exists, isTrue);
+    expect(newFile.readAsStringSync(), 'text');
+  }
+
+  void test_renameSync_newExists_file() {
+    String oldPath = '/foo/bar/file.txt';
+    String newPath = '/foo/bar/new-file.txt';
+    File file = provider.newFile(oldPath, 'text');
+    provider.newFile(newPath, 'new text');
+    File newFile = file.renameSync(newPath);
+    expect(file.path, oldPath);
+    expect(file.exists, isFalse);
+    expect(newFile.path, newPath);
+    expect(newFile.exists, isTrue);
+    expect(newFile.readAsStringSync(), 'text');
+  }
+
+  void test_renameSync_newExists_folder() {
+    String oldPath = '/foo/bar/file.txt';
+    String newPath = '/foo/bar/baz';
+    File file = provider.newFile(oldPath, 'text');
+    provider.newFolder(newPath);
+    expect(() {
+      file.renameSync(newPath);
+    }, throwsA(_isFileSystemException));
+    expect(file.path, oldPath);
+    expect(file.exists, isTrue);
+  }
+
   void test_shortName() {
     File file = provider.getResource('/foo/bar/file.txt');
     expect(file.shortName, 'file.txt');
   }
 
   void test_toString() {
     File file = provider.getResource('/foo/bar/file.txt');
     expect(file.toString(), '/foo/bar/file.txt');
   }
 
-  void test_writeAsBytesSync() {
-    File file = provider.newFileWithBytes('/file.bin', <int>[1, 2]);
+  void test_writeAsBytesSync_existing() {
+    File file = provider.newFileWithBytes('/foo/file.bin', <int>[1, 2]);
     expect(file.readAsBytesSync(), <int>[1, 2]);
     // write new bytes
     file.writeAsBytesSync(<int>[10, 20]);
     expect(file.readAsBytesSync(), <int>[10, 20]);
   }
+
+  void test_writeAsBytesSync_new() {
+    File file = provider.getFile('/foo/file.bin');
+    expect(file.exists, false);
+    // write new bytes
+    file.writeAsBytesSync(<int>[10, 20]);
+    expect(file.exists, true);
+    expect(file.readAsBytesSync(), <int>[10, 20]);
+  }
 }
 
 @reflectiveTest
 class FolderTest {
   static const String path = '/foo/bar';
 
   MemoryResourceProvider provider = new MemoryResourceProvider();
   Folder folder;
 
   void setUp() {
@@ skipping 313 matching lines @@
   void test_newFileWithBytes() {
     String path = '/my/file';
     List<int> bytes = <int>[1, 2, 3, 4, 5];
     provider.newFileWithBytes(path, bytes);
     File file = provider.getResource(path);
     expect(file, isNotNull);
     expect(file.exists, isTrue);
     expect(file.readAsBytesSync(), bytes);
   }
 
-  void test_newFolder_aleadyExists_asFile() {
+  void test_newFolder_alreadyExists_asFile() {
     provider.newFile('/my/file', 'qwerty');
     expect(() {
       provider.newFolder('/my/file');
     }, throwsA(new isInstanceOf<ArgumentError>()));
   }
 
-  void test_newFolder_aleadyExists_asFolder() {
+  void test_newFolder_alreadyExists_asFolder() {
     Folder folder = provider.newFolder('/my/folder');
     Folder newFolder = provider.newFolder('/my/folder');
     expect(newFolder, folder);
   }
 
   void test_newFolder_emptyPath() {
     expect(() {
       provider.newFolder('');
     }, throwsA(new isInstanceOf<ArgumentError>()));
   }
@@ skipping 73 matching lines @@
     return new Future.delayed(Duration.ZERO, computation);
   }
 
   _watchingFolder(String path, test(List<WatchEvent> changesReceived)) {
     Folder folder = provider.getResource(path);
     var changesReceived = <WatchEvent>[];
     folder.changes.listen(changesReceived.add);
     return test(changesReceived);
   }
 }