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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/chrome_browser_field_trials.h"
#include <memory>
#include "base/feature_list.h"
#include "components/prefs/testing_pref_service.h"
#include "components/ukm/ukm_recorder_impl.h"
#include "testing/gtest/include/gtest/gtest.h"
#if BUILDFLAG(IS_WIN) || BUILDFLAG(IS_ANDROID)
TEST(ChromeBrowserFieldTrialsTest, SamplingTrials) {
TestingPrefServiceSimple local_state;
ChromeBrowserFieldTrials chrome_browser_field_trials(&local_state);
const char kSamplingTrialName[] = "MetricsAndCrashSampling";
#if BUILDFLAG(IS_ANDROID)
const char kPostFREFixSamplingTrialName[] =
"PostFREFixMetricsAndCrashSampling";
#endif // BUILDFLAG(IS_ANDROID)
const char kUkmSamplingTrialName[] = "UkmSamplingRate";
// Verify that initially, sampling trials do not exist.
EXPECT_FALSE(base::FieldTrialList::TrialExists(kSamplingTrialName));
#if BUILDFLAG(IS_ANDROID)
EXPECT_FALSE(base::FieldTrialList::TrialExists(kPostFREFixSamplingTrialName));
#endif // BUILDFLAG(IS_ANDROID)
EXPECT_FALSE(base::FieldTrialList::TrialExists(kUkmSamplingTrialName));
// Call SetUpClientSideFieldTrials(), which should create fallback
// sampling trials since they do not exist yet. Using an empty string for
// limited_entropy_randomization_source since it's not relevant to the
// sampling trials that are being tested here.
variations::EntropyProviders entropy_providers(
"client_id", {0, 8000},
/*limited_entropy_randomization_source=*/std::string_view());
auto feature_list = std::make_unique<base::FeatureList>();
chrome_browser_field_trials.SetUpClientSideFieldTrials(
/*has_seed=*/false, entropy_providers, feature_list.get());
// Verify that the sampling trials were created.
EXPECT_TRUE(base::FieldTrialList::TrialExists(kSamplingTrialName));
#if BUILDFLAG(IS_ANDROID)
EXPECT_TRUE(base::FieldTrialList::TrialExists(kPostFREFixSamplingTrialName));
#endif // BUILDFLAG(IS_ANDROID)
EXPECT_TRUE(base::FieldTrialList::TrialExists(kUkmSamplingTrialName));
// Call SetUpClientSideFieldTrials() again. This should be a no-op,
// since the sampling trials already exist. If the trials are created again,
// a CHECK will be triggered and this will crash.
chrome_browser_field_trials.SetUpClientSideFieldTrials(
/*has_seed=*/false, entropy_providers, feature_list.get());
}
#endif // BUILDFLAG(IS_WIN) || BUILDFLAG(IS_ANDROID)
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