Kernel debugging; service tests

runtime/observatory/tests/service/next_through_simple_async_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';
+import 'dart:io';
+
+const int LINE_A = 13;
+const String file = "next_through_simple_async_test.dart";
+
+// line A is at the "code() async" line
+code() async {
+  File f = new File(Platform.script.path);
+  DateTime modified = await f.lastModified();
+  bool exists = await f.exists();
+  print("Modified: $modified; exists: $exists");
+  foo();
+}
+
+foo() {
+  print("Hello from Foo!");
+}
+
+List<String> stops = [];
+List<String> expected = [
+  "$file:${LINE_A+0}:5",
+  "$file:${LINE_A+1}:30",
+  "$file:${LINE_A+1}:37",
+  "$file:${LINE_A+1}:16",
+  "$file:${LINE_A+2}:31",
+  "$file:${LINE_A+2}:23",
+  "$file:${LINE_A+3}:25",
+  "$file:${LINE_A+3}:17",
+  "$file:${LINE_A+4}:47",
+  "$file:${LINE_A+4}:3",
+  "$file:${LINE_A+5}:3",
+  "$file:${LINE_A+6}:1"
+];
+
+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);
+}