dart:io | Implement asynchronous versions of FileSystemEntity methods.

tests/standalone/io/file_invalid_arguments_test.dart

 // Copyright (c) 2013, 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.
 
 import "package:expect/expect.dart";
 import "dart:io";
 import "dart:isolate";
 
 void testReadInvalidArgs(arg) {
   var port = new ReceivePort();
@@ skipping 112 matching lines @@
   writeStringFuture.then((ignore) {
     Expect.fail('exception expected');
   }).catchError((error) {
     Expect.isTrue(error is FileIOException);
     file.close().then((ignore) {
       port.close();
     });
   });
 }
 
+Future futureThrows(Future result) {
+  return result.then((value) {
+    throw new ExpectException(
+        "futureThrows received $value instead of an exception");
+    },
+    onError: (_) => null
+  );
+}
+
+void testFileSystemEntity() {
+  Expect.throws(() => FileSystemEntity.typeSync([1,2,3]));
+  Expect.throws(() =>
+      FileSystemEntity.typeSync(".", followLinks: "why not?"));
+  Expect.throws(() => FileSystemEntity.identicalSync([1,2,3], "."));
+  Expect.throws(() => FileSystemEntity.identicalSync("."));
+  Expect.throws(() => FileSystemEntity.identicalSync(".", 52));
+  Expect.throws(() => FileSystemEntity.isLinkSync(52));
+  Expect.throws(() => FileSystemEntity.isFileSync(52));
+  Expect.throws(() => FileSystemEntity.isDirectorySync(52));
+
+  ReceivePort keepAlive = new ReceivePort();
+  futureThrows(FileSystemEntity.type([1,2,3]))
+  .then((_) => futureThrows(
+      FileSystemEntity.type(".", followLinks: "why not?")))
+  .then((_) => futureThrows(FileSystemEntity.identical([1,2,3], ".")))
+  .then((_) => Expect.throws(() =>FileSystemEntity.identical(".")))
+  .then((_) => futureThrows(FileSystemEntity.identical(".", 52)))
+  .then((_) => futureThrows(FileSystemEntity.isLink(52)))
+  .then((_) => futureThrows(FileSystemEntity.isFile(52)))
+  .then((_) => futureThrows(FileSystemEntity.isDirectory(52)))
+  .then((_) => keepAlive.close());
+}
+
 String getFilename(String path) {
   return new File(path).existsSync() ? path : 'runtime/$path';
 }
 
 main() {
   testReadInvalidArgs('asdf');
   testReadIntoInvalidArgs(12, 0, 1);
   testReadIntoInvalidArgs(new List(10), '0', 1);
   testReadIntoInvalidArgs(new List(10), 0, '1');
   testWriteByteInvalidArgs('asdf');
   testWriteFromInvalidArgs(12, 0, 1);
   testWriteFromInvalidArgs(new List(10), '0', 1);
   testWriteFromInvalidArgs(new List(10), 0, '1');
   testWriteStringInvalidArgs("Hello, world", 42);
+  testFileSystemEntity();
 }