Port _echo, etc commands to RPC

runtime/observatory/test/malformed_test.dart

Index: runtime/observatory/test/malformed_test.dart
diff --git a/runtime/observatory/test/malformed_test.dart b/runtime/observatory/test/malformed_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..4eea69c0b6440ace24a046be09f0a7a284b7406e
--- /dev/null
+++ b/runtime/observatory/test/malformed_test.dart
@@ -0,0 +1,29 @@
+// 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.
+
+import 'dart:async';
+import 'package:observatory/service_io.dart';
+import 'package:unittest/unittest.dart';
+import 'test_helper.dart';
+
+var tests = [
+
+(Isolate isolate) =>
+  isolate.invokeRpc('_respondWithMalformedJson', { }).then((result) {
+    // Should not execute.
+    expect(true, false);
+  }).catchError((ServiceException exception) {
+    expect(exception.kind, equals('JSONDecodeException'));
+  }),
+
+(Isolate isolate) =>
+  isolate.invokeRpc('_respondWithMalformedObject', { }).then((result) {
+    // Should not execute.
+    expect(true, false);
+  }).catchError((ServiceException exception) {
+    expect(exception.kind, equals('ResponseFormatException'));
+  }),
+];
+
+main(args) => runIsolateTests(args, tests);