Improve incremental compilation.

dart/tests/compiler/dart2js/incremental/hello_test.dart

Index: dart/tests/compiler/dart2js/incremental/hello_test.dart
diff --git a/dart/tests/compiler/dart2js/incremental/hello_test.dart b/dart/tests/compiler/dart2js/incremental/hello_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..6bfc1e87683306ed4909686db46fe087fc7cc85f
--- /dev/null
+++ b/dart/tests/compiler/dart2js/incremental/hello_test.dart
@@ -0,0 +1,123 @@
+// Copyright (c) 2014, 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 a sequence of modifications to hello-world which used to cause problems
+// on Try Dart.
+
+import 'dart:io' show
+    Platform;
+
+import 'dart:async' show
+    Future;
+
+import 'package:try/src/caching_compiler.dart' show
+    reuseCompiler;
+
+import 'package:compiler/compiler.dart' as compiler;
+
+import 'package:async_helper/async_helper.dart' show
+    asyncTest;
+
+import 'package:expect/expect.dart' show
+    Expect;
+
+import '../memory_source_file_helper.dart' show
+    MemorySourceFileProvider;
+
+import 'incremental_helper.dart';
+
+var tests = {
+'/test1.dart':
+'''
+var greeting = "Hello, World!";
+
+void main() {
+  print(greeting);
+}
+''',
+'/test2.dart':
+'''
+va greeting = "Hello, World!";
+
+void main() {
+  print(greeting);
+}
+''',
+'/test3.dart':
+'''
+ greeting = "Hello, World!";
+
+void main() {
+  print(greeting);
+}
+''',
+'/test4.dart':
+'''
+in greeting = "Hello, World!";
+
+void main() {
+  print(greeting);
+}
+''',
+'/test5.dart':
+'''
+int greeting = "Hello, World!";
+
+void main() {
+  print(greeting);
+}
+''',
+};
+
+var testResults = {
+  '/test1.dart': true,
+  '/test2.dart': true,
+  '/test3.dart': false,
+  '/test4.dart': false,
+  '/test5.dart': true,
+};
+
+var cachedCompiler;
+
+main() {
+  Uri libraryRoot = Uri.base.resolve('sdk/');
+  Uri packageRoot = Uri.base.resolveUri(
+      new Uri.file('${Platform.packageRoot}/'));
+  MemorySourceFileProvider provider =
+      new MemorySourceFileProvider(tests);
+  asyncTest(
+      () => runTests(libraryRoot, packageRoot, provider, INCREMENTAL_OPTIONS));
+}
+
+Future runTests(
+    Uri libraryRoot,
+    Uri packageRoot,
+    MemorySourceFileProvider provider,
+    options) {
+  return Future.forEach(tests.keys, (String testName) {
+    cachedCompiler = reuseCompiler(
+        diagnosticHandler: handler,
+        inputProvider: provider,
+        options: options,
+        cachedCompiler: cachedCompiler,
+        libraryRoot: libraryRoot,
+        packageRoot: packageRoot);
+    Uri testUri = Uri.parse('memory:$testName');
+    return cachedCompiler.run(testUri).then((bool success) {
+      Expect.equals(
+          testResults[testName], success,
+          'Compilation unexpectedly ${success ? "succeed" : "failed"}.');
+    });
+  });
+}
+
+void handler(Uri uri,
+             int begin,
+             int end,
+             String message,
+             compiler.Diagnostic kind) {
+  if (kind != compiler.Diagnostic.VERBOSE_INFO) {
+    print('$uri:$begin:$end:$message:$kind');
+  }
+}