force_field_trials_browsertest.cc | Explore in Territory

// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <string>

#include "base/base_switches.h"
#include "base/command_line.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/metrics/field_trial.h"
#include "base/numerics/safe_conversions.h"
#include "base/path_service.h"
#include "base/strings/stringprintf.h"
#include "base/system/sys_info.h"
#include "base/test/mock_entropy_provider.h"
#include "base/threading/thread_restrictions.h"
#include "build/build_config.h"
#include "build/chromeos_buildflags.h"
#include "chrome/browser/metrics/chrome_metrics_service_accessor.h"
#include "chrome/common/chrome_paths.h"
#include "chrome/test/base/in_process_browser_test.h"
#include "components/variations/entropy_provider.h"
#include "content/public/test/browser_test.h"

namespace {

const char kEnabledGroupName[] = …;
const char kDisabledGroupName[] = …;

// Create 20 OneTimeRandomization test trials to make sure they persist their
// state correctly between runs. We use 20 trials instead of just a couple so
// that if there's a failure, it likely won't be too flaky since the chance
// of all 20 randomly getting the same state is very low.
const int kNumTestTrials = …;

}  // namespace

// This test verifies the functionality of the --force-fieldtrials flag.
// It spans multiple browser launches (using the PRE_ construct) and checks
// that forcing two trials affects only those trials, but not other ones. For
// the other trials, it checks that they get the same state between sessions
// as they use OneTimeRandomization.
class ForceFieldTrialsBrowserTest : public InProcessBrowserTest,
                                    public testing::WithParamInterface<bool> { … };

IN_PROC_BROWSER_TEST_P(ForceFieldTrialsBrowserTest, PRE_PRE_ForceTrials) { … }

// The "PRE_" prefix makes this test run before the corresponding named test.
// This allows us to do a test spanning two Chrome launches and check the
// consistency of behavior between them.
IN_PROC_BROWSER_TEST_P(ForceFieldTrialsBrowserTest, PRE_ForceTrials) { … }

IN_PROC_BROWSER_TEST_P(ForceFieldTrialsBrowserTest, ForceTrials) { … }

INSTANTIATE_TEST_SUITE_P(…);
chromium/chrome/browser/metrics/variations/force_field_trials_browsertest.cc
