Change dart:io to use Future for one-shot operations.

tests/standalone/io/directory_error_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 error handling in directory I/O.
 
 #import("dart:io");
 #import("dart:isolate");
 
 Directory tempDir() {
-  var d = new Directory('');
-  d.createTempSync();
-  return d;
+  return new Directory('').createTempSync();
 }
 
 
 bool checkCreateInNonExistentFileException(e) {
   Expect.isTrue(e is DirectoryIOException);
   Expect.isTrue(e.osError != null);
   Expect.isTrue(e.toString().indexOf("Creation failed") != -1);
   if (Platform.operatingSystem == "linux") {
     Expect.isTrue(e.toString().indexOf("No such file or directory") != -1);
     Expect.equals(2, e.osError.errorCode);
   } else if (Platform.operatingSystem == "macos") {
     Expect.isTrue(e.toString().indexOf("No such file or directory") != -1);
     Expect.equals(2, e.osError.errorCode);
   } else if (Platform.operatingSystem == "windows") {
     Expect.isTrue(
         e.toString().indexOf(
             "The system cannot find the path specified") != -1);
     Expect.equals(3, e.osError.errorCode);
   }
 
   return true;
 }
 
 
 void testCreateInNonExistent(Directory temp, Function done) {
   Directory inNonExistent = new Directory("${temp.path}/nonExistent/xxx");
   Expect.throws(() => inNonExistent.createSync(),
                 (e) => checkCreateInNonExistentFileException(e));
 
-  inNonExistent.create(() => Expect.fail("Unreachable code"));
-  inNonExistent.onError = (e) {
+  inNonExistent.create().handleException((e) {
     checkCreateInNonExistentFileException(e);
     done();
-  };
+    return true;
+  });
 }
 
 
 bool checkCreateTempInNonExistentFileException(e) {
   Expect.isTrue(e is DirectoryIOException);
   Expect.isTrue(e.osError != null);
   Expect.isTrue(e.toString().indexOf(
       "Creation of temporary directory failed") != -1);
   if (Platform.operatingSystem == "linux") {
     Expect.isTrue(e.toString().indexOf("No such file or directory") != -1);
@@ skipping 10 matching lines @@
 
   return true;
 }
 
 
 void testCreateTempInNonExistent(Directory temp, Function done) {
   Directory nonExistent = new Directory("${temp.path}/nonExistent/xxx");
   Expect.throws(() => nonExistent.createTempSync(),
                 (e) => checkCreateTempInNonExistentFileException(e));
 
-  nonExistent.createTemp(() => Expect.fail("Unreachable code"));
-  nonExistent.onError = (e) {
+  nonExistent.createTemp().handleException((e) {
     checkCreateTempInNonExistentFileException(e);
     done();
-  };
+    return true;
+  });
 }
 
 
 bool checkDeleteNonExistentFileException(e) {
   Expect.isTrue(e is DirectoryIOException);
   Expect.isTrue(e.osError != null);
   Expect.isTrue(e.toString().indexOf("Deletion failed") != -1);
   if (Platform.operatingSystem == "linux") {
     Expect.isTrue(e.toString().indexOf("No such file or directory") != -1);
   } else if (Platform.operatingSystem == "macos") {
     Expect.isTrue(e.toString().indexOf("No such file or directory") != -1);
   } else if (Platform.operatingSystem == "windows") {
     Expect.isTrue(
         e.toString().indexOf(
             "The system cannot find the file specified") != -1);
   }
   // File not not found has error code 2 on all supported platforms.
   Expect.equals(2, e.osError.errorCode);
 
   return true;
 }
 
 
 void testDeleteNonExistent(Directory temp, Function done) {
   Directory nonExistent = new Directory("${temp.path}/nonExistent");
   Expect.throws(() => nonExistent.deleteSync(),
                 (e) => checkDeleteNonExistentFileException(e));
 
-  nonExistent.delete(() => Expect.fail("Unreachable code"));
-  nonExistent.onError = (e) {
+  nonExistent.delete().handleException((e) {
     checkDeleteNonExistentFileException(e);
     done();
-  };
+    return true;
+  });
 }
 
 
 bool checkDeleteRecursivelyNonExistentFileException(e) {
   Expect.isTrue(e is DirectoryIOException);
   Expect.isTrue(e.osError != null);
   Expect.isTrue(e.toString().indexOf("Deletion failed") != -1);
   if (Platform.operatingSystem == "linux") {
     Expect.isTrue(e.toString().indexOf("No such file or directory") != -1);
     Expect.equals(2, e.osError.errorCode);
   } else if (Platform.operatingSystem == "macos") {
     Expect.isTrue(e.toString().indexOf("No such file or directory") != -1);
     Expect.equals(2, e.osError.errorCode);
   } else if (Platform.operatingSystem == "windows") {
     Expect.isTrue(
         e.toString().indexOf(
             "The system cannot find the path specified") != -1);
     Expect.equals(3, e.osError.errorCode);
   }
 
   return true;
 }
 
 
 void testDeleteRecursivelyNonExistent(Directory temp, Function done) {
   Directory nonExistent = new Directory("${temp.path}/nonExistent");
   Expect.throws(() => nonExistent.deleteRecursivelySync(),
                 (e) => checkDeleteRecursivelyNonExistentFileException(e));
 
-  nonExistent.deleteRecursively(() => Expect.fail("Unreachable code"));
-  nonExistent.onError = (e) {
+  nonExistent.deleteRecursively().handleException((e) {
     checkDeleteRecursivelyNonExistentFileException(e);
     done();
-  };
+    return true;
+  });
 }
 
 
 bool checkListNonExistentFileException(e) {
   Expect.isTrue(e is DirectoryIOException);
   Expect.isTrue(e.osError != null);
   Expect.isTrue(e.toString().indexOf("Directory listing failed") != -1);
   if (Platform.operatingSystem == "linux") {
     Expect.isTrue(e.toString().indexOf("No such file or directory") != -1);
     Expect.equals(2, e.osError.errorCode);
   } else if (Platform.operatingSystem == "macos") {
     Expect.isTrue(e.toString().indexOf("No such file or directory") != -1);
     Expect.equals(2, e.osError.errorCode);
   } else if (Platform.operatingSystem == "windows") {
     Expect.isTrue(
         e.toString().indexOf(
             "The system cannot find the path specified") != -1);
     Expect.equals(3, e.osError.errorCode);
   }
 
   return true;
 }
 
 
 void testListNonExistent(Directory temp, Function done) {
   Directory nonExistent = new Directory("${temp.path}/nonExistent");
-  nonExistent.list();
-  nonExistent.onError = (e) {
+  var lister = nonExistent.list();
+  lister.onError = (e) {
     checkListNonExistentFileException(e);
     done();
   };
 }
 
 
 void runTest(Function test) {
   // Create a temporary directory for the test.
-  var temp = new Directory('');
-  temp.createTempSync();
+  var temp = new Directory('').createTempSync();
 
   // Wait for the test to finish and delete the temporary directory.
   ReceivePort p = new ReceivePort();
   p.receive((x,y) {
     p.close();
     temp.deleteRecursivelySync();
   });
 
   // Run the test.
   test(temp, () => p.toSendPort().send(null));
 }
 
 
 main() {
   runTest(testCreateInNonExistent);
   runTest(testCreateTempInNonExistent);
   runTest(testDeleteNonExistent);
   runTest(testDeleteRecursivelyNonExistent);
   runTest(testListNonExistent);
 }