Kernel debugging; service tests

runtime/observatory/tests/service/next_through_simple_linear_test.dart

+// Copyright (c) 2017, 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 'test_helper.dart';
+import 'service_test_common.dart';
+
+const int LINE_A = 12;
+const String file = "next_through_simple_linear_test.dart";
+
+code() {
+  print("Hello, World!"); // LINE_A
+  print("Stop here too!");
+  print("Goodbye, world!");
+}
+
+List<String> stops = [];
+List<String> expected = [
+  "$file:${LINE_A+0}:3", // on call to 'print'
+  "$file:${LINE_A+1}:3", // on call to 'print'
+  "$file:${LINE_A+2}:3", // on call to 'print'
+  "$file:${LINE_A+3}:1" // on ending '}'
+];
+
+var tests = [
+  hasPausedAtStart,
+  setBreakpointAtLine(LINE_A),
+  runStepThroughProgramRecordingStops(stops),
+  checkRecordedStops(stops, expected)
+];
+
+main(args) {
+  runIsolateTestsSynchronous(args, tests,
+      testeeConcurrent: code, pause_on_start: true, pause_on_exit: true);
+}