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- // Copyright 2016 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #include "components/variations/child_process_field_trial_syncer.h"
- #include <string>
- #include <vector>
- #include "base/base_switches.h"
- #include "base/command_line.h"
- #include "base/metrics/field_trial.h"
- #include "base/test/bind.h"
- #include "base/test/scoped_feature_list.h"
- #include "base/test/task_environment.h"
- #include "testing/gmock/include/gmock/gmock.h"
- #include "testing/gtest/include/gtest/gtest.h"
- namespace variations {
- TEST(ChildProcessFieldTrialSyncerTest, FieldTrialState) {
- base::test::TaskEnvironment task_environment;
- base::test::ScopedFeatureList scoped_feature_list;
- // We expect there are no field trials, because we creates 3 field trials
- // A, B and C, and checks EXPECT_EQ("*A/G1/B/G2/C/G3/", states_string).
- // So we need to create a new scope with empty feature and field trial lists.
- scoped_feature_list.InitWithEmptyFeatureAndFieldTrialLists();
- // We don't use the descriptor here anyways so it's ok to pass -1.
- base::FieldTrialList::CreateTrialsFromCommandLine(
- *base::CommandLine::ForCurrentProcess(), -1);
- base::FieldTrial* trial1 = base::FieldTrialList::CreateFieldTrial("A", "G1");
- base::FieldTrial* trial2 = base::FieldTrialList::CreateFieldTrial("B", "G2");
- base::FieldTrial* trial3 = base::FieldTrialList::CreateFieldTrial("C", "G3");
- // Activate trial3 before command line is produced.
- trial1->group();
- std::string states_string;
- base::FieldTrialList::AllStatesToString(&states_string, false);
- base::CommandLine::ForCurrentProcess()->AppendSwitchASCII(
- switches::kForceFieldTrials, states_string);
- EXPECT_EQ("*A/G1/B/G2/C/G3/", states_string);
- // Active trial 2 before creating the syncer.
- trial2->group();
- std::vector<std::string> observed_trial_names;
- auto callback =
- base::BindLambdaForTesting([&](const std::string& trial_name) {
- observed_trial_names.push_back(trial_name);
- });
- ChildProcessFieldTrialSyncer::CreateInstance(callback);
- // The callback should be invoked for activated trials that were not specified
- // on the command line. In this case, trial 2. (Trial 1 was already active via
- // command line and so its state shouldn't be notified.)
- EXPECT_THAT(observed_trial_names, testing::ElementsAre("B"));
- // Now, activate trial 3, which should also get reflected.
- trial3->group();
- EXPECT_THAT(observed_trial_names, testing::ElementsAre("B", "C"));
- ChildProcessFieldTrialSyncer::DeleteInstanceForTesting();
- }
- } // namespace variations
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