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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 <stdint.h>
#include <memory>
#include "base/feature_list.h"
#include "base/functional/bind.h"
#include "base/strings/stringprintf.h"
#include "base/test/scoped_feature_list.h"
#include "components/variations/entropy_provider.h"
#include "components/variations/proto/study.pb.h"
#include "components/variations/proto/variations_seed.pb.h"
#include "components/variations/variations_seed_processor.h"
#include "components/variations/variations_test_utils.h"
#include "testing/gtest/include/gtest/gtest-param-test.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace variations {
namespace {
// Creates a seed with a variety of permanent consistency studies, with many
// groups to ensure that they are sensitive to any changes in the group
// assignment algorithms, which should not change between releases.
std::unique_ptr<VariationsSeed> ConstructSeed() {
auto seed = std::make_unique<VariationsSeed>();
{
Study* study = seed->add_study();
study->set_name("Study_NoSalt");
study->set_consistency(Study_Consistency_PERMANENT);
for (int i = 0; i < 100; i++) {
Study::Experiment* experiment = study->add_experiment();
experiment->set_name(base::StringPrintf("group%02d", i));
experiment->set_probability_weight(1);
}
}
{
Study* study = seed->add_study();
study->set_name("Study_WithSalt");
study->set_randomization_seed(0x1234);
study->set_consistency(Study_Consistency_PERMANENT);
for (int i = 0; i < 100; i++) {
Study::Experiment* experiment = study->add_experiment();
experiment->set_name(base::StringPrintf("group%02d", i));
experiment->set_probability_weight(1);
}
}
{
Study* study = seed->add_study();
study->set_name("Study_NoSalt_LowEntropy");
study->set_consistency(Study_Consistency_PERMANENT);
for (int i = 0; i < 100; i++) {
Study::Experiment* experiment = study->add_experiment();
experiment->set_name(base::StringPrintf("group%02d", i));
experiment->set_google_web_experiment_id(i);
experiment->set_probability_weight(1);
}
}
{
Study* study = seed->add_study();
study->set_name("Study_WithSalt_LowEntropy");
study->set_randomization_seed(0x1234);
study->set_consistency(Study_Consistency_PERMANENT);
for (int i = 0; i < 100; i++) {
Study::Experiment* experiment = study->add_experiment();
experiment->set_name(base::StringPrintf("group%02d", i));
experiment->set_google_web_experiment_id(i);
experiment->set_probability_weight(1);
}
}
return seed;
}
void ProcessSeed(EntropyProviders&& entropy_providers) {
auto seed = ConstructSeed();
auto client_state = CreateDummyClientFilterableState();
base::FeatureList feature_list;
VariationsSeedProcessor().CreateTrialsFromSeed(
*seed, *client_state, base::BindRepeating(NoopUIStringOverrideCallback),
entropy_providers, &feature_list);
}
} // namespace
// The following tests differ only by the input entropy providers, and they
// each check that the group assignments for the permanent consistency studies
// match the values from when the test was written. New changes should not
// break consistency with these assignments.
// The HighEntropyNil tests pass an empty high entropy, which simulates the
// behavior clients that disable high entropy randomization, such as clients
// not opted in to UMA, and clients on platforms like webview where high entropy
// randomization is not supported.
TEST(VariationsAntishuffleTest, HighEntropyNil_LowEntropy0) {
ProcessSeed(EntropyProviders("", 0, 8000));
EXPECT_EQ(base::FieldTrialList::FindFullName("Study_NoSalt"), "group87");
EXPECT_EQ(base::FieldTrialList::FindFullName("Study_WithSalt"), "group22");
EXPECT_EQ(base::FieldTrialList::FindFullName("Study_NoSalt_LowEntropy"),
"group10");
EXPECT_EQ(base::FieldTrialList::FindFullName("Study_WithSalt_LowEntropy"),
"group22");
}
TEST(VariationsAntishuffleTest, HighEntropyId0_LowEntropy0) {
ProcessSeed(EntropyProviders("clientid_0", 0, 8000));
EXPECT_EQ(base::FieldTrialList::FindFullName("Study_NoSalt"), "group64");
EXPECT_EQ(base::FieldTrialList::FindFullName("Study_WithSalt"), "group15");
EXPECT_EQ(base::FieldTrialList::FindFullName("Study_NoSalt_LowEntropy"),
"group10");
EXPECT_EQ(base::FieldTrialList::FindFullName("Study_WithSalt_LowEntropy"),
"group22");
}
TEST(VariationsAntishuffleTest, HighEntropyId1_LowEntropy0) {
ProcessSeed(EntropyProviders("clientid_1", 0, 8000));
EXPECT_EQ(base::FieldTrialList::FindFullName("Study_NoSalt"), "group02");
EXPECT_EQ(base::FieldTrialList::FindFullName("Study_WithSalt"), "group40");
EXPECT_EQ(base::FieldTrialList::FindFullName("Study_NoSalt_LowEntropy"),
"group10");
EXPECT_EQ(base::FieldTrialList::FindFullName("Study_WithSalt_LowEntropy"),
"group22");
}
TEST(VariationsAntishuffleTest, HighEntropyNil_LowEntropy7999) {
ProcessSeed(EntropyProviders("", 7999, 8000));
EXPECT_EQ(base::FieldTrialList::FindFullName("Study_NoSalt"), "group43");
EXPECT_EQ(base::FieldTrialList::FindFullName("Study_WithSalt"), "group48");
EXPECT_EQ(base::FieldTrialList::FindFullName("Study_NoSalt_LowEntropy"),
"group97");
EXPECT_EQ(base::FieldTrialList::FindFullName("Study_WithSalt_LowEntropy"),
"group48");
}
TEST(VariationsAntishuffleTest, HighEntropyId0_LowEntropy7999) {
ProcessSeed(EntropyProviders("clientid_0", 7999, 8000));
EXPECT_EQ(base::FieldTrialList::FindFullName("Study_NoSalt"), "group64");
EXPECT_EQ(base::FieldTrialList::FindFullName("Study_WithSalt"), "group15");
EXPECT_EQ(base::FieldTrialList::FindFullName("Study_NoSalt_LowEntropy"),
"group97");
EXPECT_EQ(base::FieldTrialList::FindFullName("Study_WithSalt_LowEntropy"),
"group48");
}
TEST(VariationsAntishuffleTest, HighEntropyId1_LowEntropy7999) {
ProcessSeed(EntropyProviders("clientid_1", 7999, 8000));
EXPECT_EQ(base::FieldTrialList::FindFullName("Study_NoSalt"), "group02");
EXPECT_EQ(base::FieldTrialList::FindFullName("Study_WithSalt"), "group40");
EXPECT_EQ(base::FieldTrialList::FindFullName("Study_NoSalt_LowEntropy"),
"group97");
EXPECT_EQ(base::FieldTrialList::FindFullName("Study_WithSalt_LowEntropy"),
"group48");
}
} // namespace variations
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