chromium/components/variations/simulate_for_crosstalk_unittest.cc

// 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 <cstring>

#include "base/memory/scoped_refptr.h"
#include "base/metrics/field_trial.h"
#include "components/variations/entropy_provider.h"
#include "testing/gtest/include/gtest/gtest.h"

// These tests mirror testSimulateTrialAssignments and
// testSimulateTrialAssignmentsWithForcedSalt in the internal crosstalk_test.py.
// Both places hard-code the same expected results, ensuring the chromium
// implementation matches the Python implementation.

namespace variations {
namespace {

AssignmentCounts;

// These studies must match the ones in crosstalk_test.py.
const char* const kDnsStudyName = …;
const char* const kInstantStudyName = …;
constexpr uint32_t kMaxLowEntropySize = …;

scoped_refptr<base::FieldTrial> CreateDnsStudy(double value) { … }

scoped_refptr<base::FieldTrial> CreateInstantStudy(double value) { … }

// Simulate assigning users with every possible low entropy source to each
// study. Populate |counts| such that count[x][y] is the number of users in both
// DnsProbe-Attempts' group x and InstantExtended's group y. If |salt|, add salt
// to InstantExtended's name.
AssignmentCounts CountAssignments(bool salt) { … }

}  // namespace

TEST(SimulateForCrosstalkTest, WithoutSalt) { … }

TEST(SimulateForCrosstalkTest, WithSalt) { … }

}  // namespace variations