Additional service tests

runtime/observatory/tests/service/step_through_arithmetic_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 = 11;
+const String file = "step_through_arithmetic_test.dart";
+
+code() {
+  print(1 + 2);
+  print((1 + 2) / 2);
+  print(1 + 2 * 3);
+  print((1 + 2) * 3);
+}
+
+List<String> stops = [];
+List<String> expected = [
+  "$file:${LINE+0}:5", // after 'code'
+
+  "$file:${LINE+1}:11", // on '+'
+  "$file:${LINE+1}:3", // on 'print'
+
+  "$file:${LINE+2}:12", // on '+'
+  "$file:${LINE+2}:17", // on '/'
+  "$file:${LINE+2}:3", // on 'print'
+
+  "$file:${LINE+3}:15", // on '*'
+  "$file:${LINE+3}:11", // on '+'
+  "$file:${LINE+3}:3", // on 'print'
+
+  "$file:${LINE+4}:12", // on '+'
+  "$file:${LINE+4}:17", // on '*'
+  "$file:${LINE+4}:3", // on 'print'
+
+  "$file:${LINE+5}:1" // on ending '}'
+];
+
+var tests = [
+  hasPausedAtStart,
+  setBreakpointAtLine(LINE),
+  runStepIntoThroughProgramRecordingStops(stops),
+  checkRecordedStops(stops, expected,
+      debugPrint: true, debugPrintFile: file, debugPrintLine: LINE)
+];
+
+main(args) {
+  runIsolateTestsSynchronous(args, tests,
+      testeeConcurrent: code, pause_on_start: true, pause_on_exit: true);
+}