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// 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 {
using AssignmentCounts = std::map<std::string, std::map<std::string, int>>;
// These studies must match the ones in crosstalk_test.py.
const char* const kDnsStudyName = "DnsProbe-Attempts";
const char* const kInstantStudyName = "InstantExtended";
constexpr uint32_t kMaxLowEntropySize = 8000;
scoped_refptr<base::FieldTrial> CreateDnsStudy(double value) {
scoped_refptr<base::FieldTrial> trial(
base::FieldTrial::CreateSimulatedFieldTrial(kDnsStudyName, 100, "default",
value));
trial->AppendGroup("1", 10);
return trial;
}
scoped_refptr<base::FieldTrial> CreateInstantStudy(double value) {
scoped_refptr<base::FieldTrial> trial(
base::FieldTrial::CreateSimulatedFieldTrial(kInstantStudyName, 100,
"DefaultGroup", value));
trial->AppendGroup("Group1", 5);
trial->AppendGroup("Control1", 5);
trial->AppendGroup("Group2", 5);
trial->AppendGroup("Control2", 5);
trial->AppendGroup("Group3", 5);
trial->AppendGroup("Control3", 5);
return trial;
}
// 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) {
AssignmentCounts counts;
for (uint16_t source = 0; source < kMaxLowEntropySize; source++) {
NormalizedMurmurHashEntropyProvider provider({source, kMaxLowEntropySize});
double dns_value = provider.GetEntropyForTrial(kDnsStudyName, 0);
std::string dns_name = CreateDnsStudy(dns_value)->group_name();
std::string instant_study_name = kInstantStudyName;
if (salt)
instant_study_name += "abcdefghijklmnop";
double instant_value = provider.GetEntropyForTrial(instant_study_name, 0);
std::string instant_name = CreateInstantStudy(instant_value)->group_name();
counts[dns_name][instant_name]++;
}
return counts;
}
} // namespace
TEST(SimulateForCrosstalkTest, WithoutSalt) {
// These must match crosstalk_test.py's testSimulateTrialAssignments.
AssignmentCounts expected = {
{
"default",
{
{"Group1", 360},
{"Control1", 365},
{"Group2", 355},
{"Control2", 347},
{"Group3", 366},
{"Control3", 354},
{"DefaultGroup", 5053},
},
},
{
"1",
{
{"Group1", 40},
{"Control1", 35},
{"Group2", 45},
{"Control2", 53},
{"Group3", 34},
{"Control3", 46},
{"DefaultGroup", 547},
},
},
};
AssignmentCounts actual = CountAssignments(false);
ASSERT_EQ(expected, actual);
}
TEST(SimulateForCrosstalkTest, WithSalt) {
// These must match crosstalk_test.py's
// testSimulateTrialAssignmentsWithForcedSalt.
AssignmentCounts expected = {
{
"default",
{
{"Group1", 362},
{"Control1", 372},
{"Group2", 365},
{"Control2", 360},
{"Group3", 357},
{"Control3", 355},
{"DefaultGroup", 5029},
},
},
{
"1",
{
{"Group1", 38},
{"Control1", 28},
{"Group2", 35},
{"Control2", 40},
{"Group3", 43},
{"Control3", 45},
{"DefaultGroup", 571},
},
},
};
AssignmentCounts actual = CountAssignments(true);
ASSERT_EQ(expected, actual);
}
} // namespace variations
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