Even easier observatory testing.

runtime/bin/vmservice/observatory/test/allocations_test.dart

 // 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.
 
 library allocations_test;
 
-import 'test_helper.dart';
 import 'package:observatory/service_io.dart';
 import 'package:unittest/unittest.dart';
+import 'test_helper.dart';
 
-import 'dart:io';
+class Foo {
+}
+List<Foo> foos;
 
-main() {
-  String script = 'allocations_script.dart';
-  var process = new TestLauncher(script);
-  process.launch().then((port) {
-    String addr = 'ws://localhost:$port/ws';
-    new WebSocketVM(new WebSocketVMTarget(addr)).get('vm')
-        .then((VM vm) => vm.isolates.first.load())
-        .then((Isolate isolate) => isolate.rootLib.load())
-        .then((Library lib) {
-          expect(lib.url.endsWith(script), isTrue);
-          return lib.classes.first.load();
-        })
-        .then((Class fooClass) {
-          expect(fooClass.name, equals('Foo'));
-          expect(fooClass.newSpace.accumulated.instances +
-                 fooClass.oldSpace.accumulated.instances, equals(3));
-          exit(0);
-        });
-  });
+void script() {
+  foos = [new Foo(), new Foo(), new Foo()];
 }
+
+var tests = [
+
+(Isolate isolate) =>
+  isolate.rootLib.load().then((Library lib) {
+    expect(lib.url.endsWith('allocations_test.dart'), isTrue);
+    expect(lib.classes.length, equals(1));
+    return lib.classes.first.load().then((Class fooClass) {
+      expect(fooClass.name, equals('Foo'));
+      expect(fooClass.newSpace.accumulated.instances +
+             fooClass.oldSpace.accumulated.instances, equals(3));
+    });
+}),
+
+];
+
+main(args) => runIsolateTests(args, tests, testeeBefore: script);