First pass at asynchronous input loading in dart2js.

tests/compiler/dart2js/missing_file_test.dart

Index: tests/compiler/dart2js/missing_file_test.dart
diff --git a/tests/compiler/dart2js/package_root_test.dart b/tests/compiler/dart2js/missing_file_test.dart
similarity index 66%
copy from tests/compiler/dart2js/package_root_test.dart
copy to tests/compiler/dart2js/missing_file_test.dart
index 62c106d693c93ab9db9c0214251a91e7171f6923..349b61cb6306406e6f669ea68f6b621c57ff73d4 100644
--- a/tests/compiler/dart2js/package_root_test.dart
+++ b/tests/compiler/dart2js/missing_file_test.dart
@@ -1,72 +1,78 @@
-// 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.
-
-// Test that the compiler can handle imports when package root has not been set.
-
-library dart2js.test.package_root;
-
-import 'package:expect/expect.dart';
-import 'memory_source_file_helper.dart';
-
-import '../../../sdk/lib/_internal/compiler/implementation/dart2jslib.dart'
-       show NullSink;
-
-import '../../../sdk/lib/_internal/compiler/compiler.dart'
-       show DiagnosticHandler, Diagnostic;
-
-import 'dart:async';
-
-import '../../../sdk/lib/_internal/compiler/implementation/mirrors/mirrors.dart';
-import '../../../sdk/lib/_internal/compiler/implementation/mirrors/dart2js_mirror.dart';
-
-const MEMORY_SOURCE_FILES = const {
-  'main.dart': '''
-
-import 'package:foo/foo.dart';
-
-main() {}
-''',
-};
-
-void runCompiler(Uri main) {
-  Uri script = currentDirectory.resolve(nativeToUriPath(Platform.script));
-  Uri libraryRoot = script.resolve('../../../sdk/');
-
-  MemorySourceFileProvider.MEMORY_SOURCE_FILES = MEMORY_SOURCE_FILES;
-  var provider = new MemorySourceFileProvider();
-  var handler = new FormattingDiagnosticHandler(provider);
-  var errors = [];
-
-  void diagnosticHandler(Uri uri, int begin, int end, String message,
-                         Diagnostic kind) {
-    if (kind == Diagnostic.ERROR) {
-      errors.add(message);
-    }
-    handler(uri, begin, end, message, kind);
-  }
-
-
-  EventSink<String> outputProvider(String name, String extension) {
-    if (name != '') throw 'Attempt to output file "$name.$extension"';
-    return new NullSink('$name.$extension');
-  }
-
-  Compiler compiler = new Compiler(provider.readStringFromUri,
-                                   outputProvider,
-                                   diagnosticHandler,
-                                   libraryRoot,
-                                   null,
-                                   []);
-
-  compiler.run(main);
-  Expect.equals(1, errors.length);
-  Expect.equals('Error: Cannot resolve "package:foo/foo.dart". '
-                'Package root has not been set.',
-                errors[0]);
-}
-
-void main() {
-  runCompiler(Uri.parse('memory:main.dart'));
-  runCompiler(Uri.parse('package:foo/foo.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.
+
+// Test that the compiler can handle imports when package root has not been set.
+
+library dart2js.test.missing_file;
+
+import 'package:expect/expect.dart';
+import "package:async_helper/async_helper.dart";
+import 'memory_source_file_helper.dart';
+
+import '../../../sdk/lib/_internal/compiler/implementation/dart2jslib.dart'
+       show NullSink;
+
+import '../../../sdk/lib/_internal/compiler/compiler.dart'
+       show DiagnosticHandler, Diagnostic;
+
+import 'dart:async';
+
+import '../../../sdk/lib/_internal/compiler/implementation/mirrors/mirrors.dart';
+import '../../../sdk/lib/_internal/compiler/implementation/mirrors/dart2js_mirror.dart';
+
+const MEMORY_SOURCE_FILES = const {
+  'main.dart': '''
+
+import 'foo.dart';
+
+main() {}
+''',
+};
+
+void runCompiler(Uri main, String expectedMessage) {
+  Uri script = currentDirectory.resolve(nativeToUriPath(Platform.script));
+  Uri libraryRoot = script.resolve('../../../sdk/');
+
+  var provider = new MemorySourceFileProvider(MEMORY_SOURCE_FILES);
+  var handler = new FormattingDiagnosticHandler(provider);
+  var errors = [];
+
+  void diagnosticHandler(Uri uri, int begin, int end, String message,
+                         Diagnostic kind) {
+    if (kind == Diagnostic.ERROR) {
+      errors.add(message);
+    }
+    handler(uri, begin, end, message, kind);
+  }
+
+
+  EventSink<String> outputProvider(String name, String extension) {
+    if (name != '') throw 'Attempt to output file "$name.$extension"';
+    return new NullSink('$name.$extension');
+  }
+
+  Compiler compiler = new Compiler(provider,
+                                   outputProvider,
+                                   diagnosticHandler,
+                                   libraryRoot,
+                                   null,
+                                   []);
+
+  asyncTest(() => compiler.run(main).then((_) {
+    Expect.equals(1, errors.length);
+    Expect.equals(expectedMessage,
+                  errors[0]);
+  }));
+}
+
+void main() {
+  runCompiler(Uri.parse('memory:main.dart'),
+              "Error: Can't read 'memory:foo.dart' "
+              "(No such file memory:foo.dart).");
+  runCompiler(Uri.parse('memory:foo.dart'),
+              "Error: Can't read 'memory:foo.dart' "
+              "(No such file memory:foo.dart).");
+  runCompiler(Uri.parse('dart:foo'),
+              'Error: Library not found "dart:foo".');
+}