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// Copyright 2016 The Chromium Authors
// 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/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();
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->Activate();
std::string states_string;
base::FieldTrialList::AllStatesToString(&states_string);
EXPECT_EQ("*A/G1/B/G2/C/G3", states_string);
// Active trial 2 before creating the syncer.
trial2->Activate();
std::vector<std::string> observed_trial_names;
auto callback =
base::BindLambdaForTesting([&](const std::string& trial_name) {
observed_trial_names.push_back(trial_name);
});
std::set<std::string> initially_active_trials = {"A"};
ChildProcessFieldTrialSyncer::CreateInstanceForTesting(
initially_active_trials, callback);
// The callback should be invoked for activated trials that were not initially
// active, but were activated later. In this case, trial 2. (Trial 1 was
// already active 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->Activate();
EXPECT_THAT(observed_trial_names, testing::ElementsAre("B", "C"));
ChildProcessFieldTrialSyncer::DeleteInstanceForTesting();
}
} // namespace variations
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