runtime/observatory/tests/service/get_flag_list_rpc_test.dart

// Copyright (c) 2015, 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 'package:observatory/service_io.dart';
import 'package:unittest/unittest.dart';

import 'test_helper.dart';

Future getFlagValue(VM vm, String flagName) async {
  var result = await vm.invokeRpcNoUpgrade('getFlagList', {});
  expect(result['type'], equals('FlagList'));
  final flags = result['flags'];
  for (final flag in flags) {
    if (flag['name'] == flagName) {
      return flag['valueAsString'];
    }
  }
}

var tests = <VMTest>[
  (VM vm) async {
    var result = await vm.invokeRpcNoUpgrade('getFlagList', {});
    expect(result['type'], equals('FlagList'));
    // TODO(turnidge): Make this test a bit beefier.
  },

  // Modify a flag which does not exist.
  (VM vm) async {
    var params = {
      'name': 'does_not_really_exist',
      'value': 'true',
    };
    var result = await vm.invokeRpcNoUpgrade('setFlag', params);
    expect(result['type'], equals('Error'));
    expect(result['message'], equals('Cannot set flag: flag not found'));
  },

  // Modify a flag with the wrong value type.
  (VM vm) async {
    var params = {
      'name': 'pause_isolates_on_start',
      'value': 'not-a-boolean',
    };
    var result = await vm.invokeRpcNoUpgrade('setFlag', params);
    expect(result['type'], equals('Error'));
    expect(result['message'], equals('Cannot set flag: invalid value'));
  },

  // Modify a flag with the right value type.
  (VM vm) async {
    var params = {
      'name': 'pause_isolates_on_start',
      'value': 'false',
    };
    var result = await vm.invokeRpcNoUpgrade('setFlag', params);
    expect(result['type'], equals('Success'));
  },

  // Modify a flag which cannot be set at runtime.
  (VM vm) async {
    var params = {
      'name': 'random_seed',
      'value': '42',
    };
    var result = await vm.invokeRpcNoUpgrade('setFlag', params);
    expect(result['type'], equals('Error'));
    expect(
        result['message'], equals('Cannot set flag: cannot change at runtime'));
  },

  // Modify the profile_period at runtime.
  (VM vm) async {
    final kProfilePeriod = 'profile_period';
    final kValue = 100;
    expect(await getFlagValue(vm, kProfilePeriod), '1000');
    var params = {
      'name': '$kProfilePeriod',
      'value': '$kValue',
    };
    var result = await vm.invokeRpcNoUpgrade('setFlag', params);
    expect(result['type'], equals('Success'));
    expect(await getFlagValue(vm, kProfilePeriod), kValue.toString());
  }
];

main(args) async => runVMTests(args, tests);