Implement File.lastModified.

tests/standalone/io/file_test.dart

 // Copyright (c) 2012, 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.
 //
 // Dart test program for testing file I/O.
 
 #import("dart:io");
 #import("dart:isolate");
 
 class MyListOfOneElement implements List {
@@ skipping 953 matching lines @@
         readAsLinesFuture.handleException((e) {
           port.toSendPort().send(1);
           return true;
         });
         return true;
       });
       return true;
     });
   }
 
+  static void testLastModified() {
+    var port = new ReceivePort();
+    new File(new Options().executable).lastModified().then((modified) {

[Anders Johnsen, 2012/05/24 12:05:42]

Cute :)

+      Expect.isTrue(modified is Date);
+      Expect.isTrue(modified < new Date.now());
+      port.close();
+    });
+  }
+
+  static void testLastModifiedSync() {
+    var modified = new File(new Options().executable).lastModifiedSync();
+    Expect.isTrue(modified is Date);
+    Expect.isTrue(modified < new Date.now());
+  }
+
   // Test that opens the same file for writing then for appending to test
   // that the file is not truncated when opened for appending.
   static void testAppend() {
     var file = new File('${tempDirectory.path}/out_append');
     file.open(FileMode.WRITE).then((openedFile) {
       openedFile.writeString("asdf").then((ignore) {
         openedFile.close().then((ignore) {
           file.open(FileMode.APPEND).then((openedFile) {
             openedFile.length().then((length) {
               Expect.equals(4, length);
@@ skipping 53 matching lines @@
     testPositionSync();
     testOpenDirectoryAsFile();
     testOpenDirectoryAsFileSync();
     testReadAsBytes();
     testReadAsBytesSync();
     testReadAsText();
     testReadAsTextSync();
     testReadAsLines();
     testReadAsLinesSync();
     testReadAsErrors();
+    testLastModified();
+    testLastModifiedSync();
 
     createTempDirectory(() {
       testReadWrite();
       testReadWriteSync();
       testReadWriteStream();
       testReadEmptyFileSync();
       testReadEmptyFile();
       testTruncate();
       testTruncateSync();
       testCloseException();
       testCloseExceptionStream();
       testBufferOutOfBoundsException();
       testAppend();
       testAppendSync();
       testWriteAppend();
       testOutputStreamWriteAppend();
       testOutputStreamWriteString();
       testWriteVariousLists();
       testDirectory();
       testDirectorySync();
     });
   }
 }
 
 main() {
   FileTest.testMain();
 }