Add an async descriptor to scheduled_test.

pkg/scheduled_test/test/descriptor_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.
 
 library descriptor_test;
 
 import 'dart:async';
 import 'dart:io';
 
 import 'package:pathos/path.dart' as path;
 import 'package:scheduled_test/descriptor.dart' as d;
 import 'package:scheduled_test/scheduled_test.dart';
 
 import 'metatest.dart';
+import 'utils.dart';
 
 String sandbox;
 
 void main() {
   expectTestsPass('file().create() creates a file', () {
     test('test', () {
       scheduleSandbox();
 
       d.file('name.txt', 'contents').create();
 
@@ skipping 829 matching lines @@
           "'-- file2.txt"));
     });
   });
 
   expectTestsPass("directory().describe() with no contents returns the "
       "directory name", () {
     test('test', () {
       expect(d.dir('dir').describe(), equals('dir'));
     });
   });
+
+  expectTestsPass("async().create() forwards to file().create", () {
+    test('test', () {
+      scheduleSandbox();
+
+      d.async(pumpEventQueue().then((_) {
+        return d.file('name.txt', 'contents');
+      })).create();
+
+      d.file('name.txt', 'contents').validate();
+    });
+  });
+
+  expectTestsPass("async().create() forwards to directory().create", () {
+    test('test', () {
+      scheduleSandbox();
+
+      d.async(pumpEventQueue().then((_) {
+        return d.dir('dir', [
+          d.file('file1.txt', 'contents1'),
+          d.file('file2.txt', 'contents2')
+        ]);
+      })).create();
+
+      d.dir('dir', [
+        d.file('file1.txt', 'contents1'),
+        d.file('file2.txt', 'contents2')
+      ]).validate();
+    });
+  });
+
+  expectTestsPass("async().validate() forwards to file().validate", () {
+    test('test', () {
+      scheduleSandbox();
+
+      d.file('name.txt', 'contents').create();
+
+      d.async(pumpEventQueue().then((_) {
+        return d.file('name.txt', 'contents');
+      })).validate();
+    });
+  });
+
+  expectTestsPass("async().validate() fails if file().validate fails", () {
+    var errors;
+    test('test 1', () {
+      scheduleSandbox();
+
+      currentSchedule.onException.schedule(() {
+        errors = currentSchedule.errors;
+      });
+
+      d.async(pumpEventQueue().then((_) {
+        return d.file('name.txt', 'contents');
+      })).validate();
+    });
+
+    test('test 2', () {
+      expect(errors, everyElement(new isInstanceOf<ScheduleError>()));
+      expect(errors.length, equals(1));
+      expect(errors.first.error,
+          matches(r"^File not found: '[^']+[\\/]name\.txt'\.$"));
+    });
+  }, passing: ['test 2']);
+
+  expectTestsPass("async().validate() forwards to directory().validate", () {
+    test('test', () {
+      scheduleSandbox();
+
+      d.dir('dir', [
+        d.file('file1.txt', 'contents1'),
+        d.file('file2.txt', 'contents2')
+      ]).create();
+
+      d.async(pumpEventQueue().then((_) {
+        return d.dir('dir', [
+          d.file('file1.txt', 'contents1'),
+          d.file('file2.txt', 'contents2')
+        ]);
+      })).validate();
+    });
+  });
+
+  expectTestsPass("async().create() fails if directory().create fails", () {
+    var errors;
+    test('test 1', () {
+      scheduleSandbox();
+
+      currentSchedule.onException.schedule(() {
+        errors = currentSchedule.errors;
+      });
+
+      d.async(pumpEventQueue().then((_) {
+        return d.dir('dir', [
+          d.file('file1.txt', 'contents1'),
+          d.file('file2.txt', 'contents2')
+        ]);
+      })).validate();
+    });
+
+    test('test 2', () {
+      expect(errors, everyElement(new isInstanceOf<ScheduleError>()));
+      expect(errors.length, equals(1));
+      expect(errors.first.error,
+          matches(r"^Directory not found: '[^']+[\\/]dir'\.$"));
+    });
+  }, passing: ['test 2']);
+
+  expectTestsPass("async().load() fails", () {
+    test('test', () {
+      scheduleSandbox();
+
+      expect(d.async(new Future.immediate(d.file('name.txt')))
+              .load('path').toList(),
+          throwsA(equals("Async descriptors don't support load().")));
+    });
+  });
+
+  expectTestsPass("async().read() fails", () {
+    test('test', () {
+      scheduleSandbox();
+
+      expect(d.async(new Future.immediate(d.file('name.txt'))).read().toList(),
+          throwsA(equals("Async descriptors don't support read().")));
+    });
+  });
 }
 
 void scheduleSandbox() {
   schedule(() {
     return new Directory('').createTemp().then((dir) {
       sandbox = dir.path;
       d.defaultRoot = sandbox;
     });
   });
 
   currentSchedule.onComplete.schedule(() {
     d.defaultRoot = null;
     if (sandbox == null) return;
     var oldSandbox = sandbox;
     sandbox = null;
     return new Directory(oldSandbox).delete(recursive: true);
   });
 }
 
 Future<List<int>> byteStreamToList(Stream<List<int>> stream) {
   return stream.reduce(<int>[], (buffer, chunk) {
     buffer.addAll(chunk);
     return buffer;
   });
 }
 
 Future<String> byteStreamToString(Stream<List<int>> stream) =>
   byteStreamToList(stream).then((bytes) => new String.fromCharCodes(bytes));