Build script views programmatically.

runtime/observatory/test/caching_test.dart

Index: runtime/observatory/test/caching_test.dart
diff --git a/runtime/observatory/test/caching_test.dart b/runtime/observatory/test/caching_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..dacfb18ec9ed8d779e1fbb4eb8fa82b954ac2b46
--- /dev/null
+++ b/runtime/observatory/test/caching_test.dart
@@ -0,0 +1,39 @@
+// Copyright (c) 2015, 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.
+
+// If caching is working properly, the coverage data will go into the same
+// Script object from which we requested coverage data, instead of a new
+// Script object.
+
+library caching_test;
+
+import 'package:observatory/service_io.dart';
+import 'package:unittest/unittest.dart';
+import 'test_helper.dart';
+import 'dart:async';
+
+script() {
+  print("This executed");
+}
+
+hasSomeCoverageData(Script script) {
+  for (var line in script.lines) {
+    if (line.hits != null) return true;
+  }
+  return false;
+}
+
+var tests = [
+(Isolate isolate) async {
+  Library lib = await isolate.rootLib.load();
+  Script script = await lib.scripts.single.load();
+  expect(hasSomeCoverageData(script), isFalse);
+  Script script2 = await script.refreshCoverage();
+  expect(identical(script, script2), isTrue);
+  expect(hasSomeCoverageData(script), isTrue);
+},
+
+];
+
+main(args) => runIsolateTests(args, tests, testeeBefore: script);