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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/variations/limited_layer_entropy_cost_tracker.h"
#include <cstdint>
#include <utility>
#include <vector>
#include "base/strings/strcat.h"
#include "base/strings/string_number_conversions.h"
#include "components/variations/entropy_provider.h"
#include "components/variations/proto/layer.pb.h"
#include "components/variations/proto/study.pb.h"
#include "components/variations/proto/variations_seed.pb.h"
#include "components/variations/variations_layers.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace variations {
namespace {
inline constexpr uint32_t kTestLayerId = 1001;
inline constexpr int kTestLayerMemberId = 2001;
inline constexpr char kTestClientId[] = "test_client_id";
// The following value ensures slot 0 is selected (among 100 slots) when the
// limited entropy provider is used.
inline constexpr char kTestLimitedEntropyRandomizationSource[] =
"limited_entropy_randomization_source_964";
Study::Experiment CreateExperiment(int weight) {
Study::Experiment experiment;
experiment.set_probability_weight(weight);
return experiment;
}
Study::Experiment CreateGoogleWebExperiment(int weight,
int google_web_experiment_id) {
auto experiment = CreateExperiment(weight);
experiment.set_google_web_experiment_id(google_web_experiment_id);
return experiment;
}
Study::Experiment CreateTriggerExperiment(
int weight,
int google_web_trigger_experiment_id) {
auto experiment = CreateExperiment(weight);
experiment.set_google_web_trigger_experiment_id(
google_web_trigger_experiment_id);
return experiment;
}
std::vector<Study::Experiment> CreateExperimentsWithTwoBitsOfEntropy() {
// Create 3 experiments with a total probability weight of 100. Only the 25%
// group has a google_web_experiment_id so the entropy used should be
// -log2(1/4) = 2.
std::vector<Study::Experiment> experiments = {
CreateExperiment(10), CreateGoogleWebExperiment(25, 100001),
CreateExperiment(65)};
return experiments;
}
LayerMemberReference CreateLayerMemberReference(
uint32_t layer_id,
const std::vector<uint32_t>& layer_member_ids) {
LayerMemberReference layer_member_reference;
layer_member_reference.set_layer_id(layer_id);
for (uint32_t layer_member_id : layer_member_ids) {
layer_member_reference.add_layer_member_ids(layer_member_id);
}
return layer_member_reference;
}
// Creates a test study.
Study CreateTestStudy(const std::vector<Study::Experiment>& experiments) {
Study study;
study.set_name("test_study");
std::vector<Study::Experiment> copied_experiments(experiments);
for (size_t i = 0; i < copied_experiments.size(); ++i) {
copied_experiments[i].set_name(
base::StrCat({"test_experiment_", base::NumberToString(i)}));
Study_Experiment* experiment_to_add = study.add_experiment();
experiment_to_add->MergeFrom(copied_experiments[i]);
}
return study;
}
Study CreateTestStudy(const std::vector<Study::Experiment>& experiments,
const LayerMemberReference& layer_member_reference) {
auto study = CreateTestStudy(experiments);
auto* layer_member_reference_to_add = study.mutable_layer();
layer_member_reference_to_add->MergeFrom(layer_member_reference);
return study;
}
// Creates a test layer member with slot ranges given as <start, end> pairs.
Layer::LayerMember CreateLayerMember(
int layer_member_id,
const std::vector<std::pair<int, int>>& slot_ranges) {
Layer::LayerMember layer_member;
layer_member.set_id(layer_member_id);
for (const auto& slot_range : slot_ranges) {
auto* slot = layer_member.add_slots();
slot->set_start(slot_range.first);
slot->set_end(slot_range.second);
}
return layer_member;
}
Layer CreateLayer(int layer_id,
int num_slots,
Layer::EntropyMode entropy_mode,
const std::vector<Layer::LayerMember>& layer_members) {
Layer layer;
layer.set_id(layer_id);
layer.set_num_slots(num_slots);
layer.set_entropy_mode(entropy_mode);
for (const auto& layer_member : layer_members) {
auto* member_to_add = layer.add_members();
member_to_add->MergeFrom(layer_member);
}
return layer;
}
VariationsSeed CreateTestSeed(const std::vector<Layer>& layers,
const std::vector<Study>& studies) {
VariationsSeed seed;
for (const auto& study : studies) {
auto* study_to_add = seed.add_study();
study_to_add->MergeFrom(study);
}
for (const auto& layer : layers) {
auto* layer_to_add = seed.add_layers();
layer_to_add->MergeFrom(layer);
}
return seed;
}
} // namespace
class LimitedLayerEntropyCostTrackerTest : public ::testing::Test {
public:
LimitedLayerEntropyCostTrackerTest()
: entropy_providers_(
kTestClientId,
// Using 100 as the test LES value (as opposed to the production
// value of 8000) since this test suite is for using the limited
// entropy randomization source.
{0, 100},
kTestLimitedEntropyRandomizationSource) {
}
protected:
const EntropyProviders entropy_providers_;
};
TEST_F(LimitedLayerEntropyCostTrackerTest, TestConstructor_WithNoLimitedLayer) {
std::vector<Study::Experiment> experiments = {
CreateGoogleWebExperiment(50, 100001),
CreateExperiment(50),
};
auto test_study = CreateTestStudy(
experiments,
CreateLayerMemberReference(kTestLayerId, {kTestLayerMemberId}));
auto test_seed = CreateTestSeed({}, {test_study});
VariationsLayers layers(test_seed, entropy_providers_);
LimitedLayerEntropyCostTracker limited_entropy_tracker(layers, test_seed, 18);
EXPECT_EQ(18, limited_entropy_tracker.entropy_limit_in_bits_);
EXPECT_EQ(0u, limited_entropy_tracker.active_limited_layer_id_);
EXPECT_TRUE(limited_entropy_tracker.limited_layers_ids_.empty());
EXPECT_TRUE(limited_entropy_tracker.entropy_used_by_layer_members_.empty());
EXPECT_EQ(0, limited_entropy_tracker.GetTotalEntropyUsedForTesting());
}
TEST_F(LimitedLayerEntropyCostTrackerTest,
TestConstructor_WithNonLimitedEntropyMode) {
std::vector<Study::Experiment> experiments = {
CreateGoogleWebExperiment(50, 100001),
CreateExperiment(50),
};
auto test_layer =
CreateLayer(kTestLayerId, 100, Layer::DEFAULT,
{CreateLayerMember(kTestLayerMemberId, {{0, 99}})});
auto test_study = CreateTestStudy(
experiments,
CreateLayerMemberReference(kTestLayerId, {kTestLayerMemberId}));
auto test_seed = CreateTestSeed({test_layer}, {test_study});
VariationsLayers layers(test_seed, entropy_providers_);
LimitedLayerEntropyCostTracker limited_entropy_tracker(layers, test_seed, 5);
EXPECT_EQ(5, limited_entropy_tracker.entropy_limit_in_bits_);
EXPECT_EQ(0u, limited_entropy_tracker.active_limited_layer_id_);
EXPECT_TRUE(limited_entropy_tracker.limited_layers_ids_.empty());
EXPECT_TRUE(limited_entropy_tracker.entropy_used_by_layer_members_.empty());
EXPECT_EQ(0, limited_entropy_tracker.GetTotalEntropyUsedForTesting());
}
TEST_F(LimitedLayerEntropyCostTrackerTest, TestConstructor_WithNoLayerMembers) {
auto test_layer = CreateLayer(kTestLayerId, /*num_slots=*/100, Layer::LIMITED,
/*layer_members=*/{});
auto test_study = CreateTestStudy(
CreateExperimentsWithTwoBitsOfEntropy(),
CreateLayerMemberReference(kTestLayerId, {kTestLayerMemberId}));
auto test_seed = CreateTestSeed({test_layer}, {test_study});
VariationsLayers layers(test_seed, entropy_providers_);
LimitedLayerEntropyCostTracker limited_entropy_tracker(layers, test_seed, 5);
EXPECT_EQ(5, limited_entropy_tracker.entropy_limit_in_bits_);
EXPECT_EQ(0u, limited_entropy_tracker.active_limited_layer_id_);
EXPECT_EQ(1u, limited_entropy_tracker.limited_layers_ids_.size());
EXPECT_TRUE(
limited_entropy_tracker.limited_layers_ids_.contains(kTestLayerId));
EXPECT_TRUE(limited_entropy_tracker.entropy_used_by_layer_members_.empty());
EXPECT_EQ(0, limited_entropy_tracker.GetTotalEntropyUsedForTesting());
}
TEST_F(LimitedLayerEntropyCostTrackerTest,
TestConstructor_WithManyLimitedLayers) {
std::vector<Study::Experiment> experiments = {
CreateGoogleWebExperiment(50, 100001),
CreateExperiment(50),
};
auto test_layer_1 =
CreateLayer(kTestLayerId, /*num_slots=*/100, Layer::LIMITED,
{CreateLayerMember(kTestLayerMemberId, {{0, 99}})});
auto test_layer_2 =
CreateLayer(kTestLayerId + 1, /*num_slots=*/100, Layer::LIMITED,
{CreateLayerMember(kTestLayerMemberId, {{0, 99}})});
auto test_study = CreateTestStudy(
experiments,
CreateLayerMemberReference(kTestLayerId, {kTestLayerMemberId}));
auto test_seed = CreateTestSeed({test_layer_1, test_layer_2}, {test_study});
VariationsLayers layers(test_seed, entropy_providers_);
LimitedLayerEntropyCostTracker limited_entropy_tracker(layers, test_seed, 5);
EXPECT_EQ(5, limited_entropy_tracker.entropy_limit_in_bits_);
EXPECT_EQ(0u, limited_entropy_tracker.active_limited_layer_id_);
EXPECT_EQ(2u, limited_entropy_tracker.limited_layers_ids_.size());
EXPECT_TRUE(
limited_entropy_tracker.limited_layers_ids_.contains(kTestLayerId));
EXPECT_TRUE(
limited_entropy_tracker.limited_layers_ids_.contains(kTestLayerId + 1));
EXPECT_TRUE(limited_entropy_tracker.entropy_used_by_layer_members_.empty());
EXPECT_EQ(0, limited_entropy_tracker.GetTotalEntropyUsedForTesting());
}
TEST_F(LimitedLayerEntropyCostTrackerTest,
TestConstructor_WithMisconfiguredLimitedLayer) {
std::vector<Study::Experiment> experiments = {
CreateGoogleWebExperiment(50, 100001),
CreateExperiment(50),
};
auto test_layer =
CreateLayer(kTestLayerId, /*num_slots=*/0, Layer::LIMITED,
{CreateLayerMember(kTestLayerMemberId, {{0, 99}})});
auto test_study = CreateTestStudy(
experiments,
CreateLayerMemberReference(kTestLayerId, {kTestLayerMemberId}));
auto test_seed = CreateTestSeed({test_layer}, {test_study});
VariationsLayers layers(test_seed, entropy_providers_);
LimitedLayerEntropyCostTracker limited_entropy_tracker(layers, test_seed, 5);
EXPECT_EQ(5, limited_entropy_tracker.entropy_limit_in_bits_);
EXPECT_EQ(0u, limited_entropy_tracker.active_limited_layer_id_);
EXPECT_EQ(1u, limited_entropy_tracker.limited_layers_ids_.size());
EXPECT_TRUE(
limited_entropy_tracker.limited_layers_ids_.contains(kTestLayerId));
EXPECT_TRUE(limited_entropy_tracker.entropy_used_by_layer_members_.empty());
EXPECT_EQ(0, limited_entropy_tracker.GetTotalEntropyUsedForTesting());
}
TEST_F(LimitedLayerEntropyCostTrackerTest, TestConstructor_WithLimitedLayer) {
std::vector<Study::Experiment> experiments = {
CreateGoogleWebExperiment(50, 100001),
CreateExperiment(50),
};
auto test_layer = CreateLayer(
kTestLayerId, /*num_slots=*/100, Layer::LIMITED,
{CreateLayerMember(1, {{0, 49}}), CreateLayerMember(2, {{50, 99}})});
;
auto test_study = CreateTestStudy(
experiments,
CreateLayerMemberReference(kTestLayerId, {kTestLayerMemberId}));
auto test_seed = CreateTestSeed({test_layer}, {test_study});
VariationsLayers layers(test_seed, entropy_providers_);
LimitedLayerEntropyCostTracker limited_entropy_tracker(layers, test_seed, 15);
EXPECT_EQ(15, limited_entropy_tracker.entropy_limit_in_bits_);
EXPECT_EQ(kTestLayerId, limited_entropy_tracker.active_limited_layer_id_);
EXPECT_EQ(1u, limited_entropy_tracker.limited_layers_ids_.size());
EXPECT_TRUE(
limited_entropy_tracker.limited_layers_ids_.contains(kTestLayerId));
EXPECT_DOUBLE_EQ(
2, limited_entropy_tracker.entropy_used_by_layer_members_.size());
EXPECT_EQ(1, limited_entropy_tracker.entropy_used_by_layer_members_[1]);
EXPECT_EQ(1, limited_entropy_tracker.entropy_used_by_layer_members_[2]);
EXPECT_EQ(0, limited_entropy_tracker.GetTotalEntropyUsedForTesting());
}
TEST_F(LimitedLayerEntropyCostTrackerTest,
TestConstructor_LayerMembersUsingEntropyAboveLimit) {
std::vector<Study::Experiment> experiments = {
CreateGoogleWebExperiment(25, 100001),
CreateGoogleWebExperiment(25, 100002),
CreateExperiment(50),
};
auto test_layer = CreateLayer(
kTestLayerId, /*num_slots=*/100, Layer::LIMITED,
{CreateLayerMember(1, {{0, 24}}), CreateLayerMember(2, {{25, 49}}),
CreateLayerMember(3, {{50, 99}})});
;
auto test_study = CreateTestStudy(
experiments,
CreateLayerMemberReference(kTestLayerId, {kTestLayerMemberId}));
auto test_seed = CreateTestSeed({test_layer}, {test_study});
VariationsLayers layers(test_seed, entropy_providers_);
LimitedLayerEntropyCostTracker limited_entropy_tracker(layers, test_seed, 1);
EXPECT_EQ(1, limited_entropy_tracker.entropy_limit_in_bits_);
EXPECT_EQ(kTestLayerId, limited_entropy_tracker.active_limited_layer_id_);
EXPECT_EQ(1u, limited_entropy_tracker.limited_layers_ids_.size());
EXPECT_TRUE(
limited_entropy_tracker.limited_layers_ids_.contains(kTestLayerId));
EXPECT_DOUBLE_EQ(
3, limited_entropy_tracker.entropy_used_by_layer_members_.size());
EXPECT_EQ(2, limited_entropy_tracker.entropy_used_by_layer_members_[1]);
EXPECT_EQ(2, limited_entropy_tracker.entropy_used_by_layer_members_[2]);
EXPECT_EQ(1, limited_entropy_tracker.entropy_used_by_layer_members_[3]);
// The total entropy used is zero because no study entropy was added to the
// tracker at this stage.
EXPECT_FALSE(limited_entropy_tracker.includes_entropy_used_by_studies_);
EXPECT_EQ(0, limited_entropy_tracker.GetTotalEntropyUsedForTesting());
EXPECT_FALSE(limited_entropy_tracker.entropy_limit_reached_);
}
TEST_F(LimitedLayerEntropyCostTrackerTest,
TestTryAddEntropyUsedByStudy_StudyReferencingNonLimitedLayer) {
std::vector<Study::Experiment> experiments = {
CreateGoogleWebExperiment(25, 100001),
CreateGoogleWebExperiment(25, 200002),
CreateExperiment(50),
};
auto test_layer =
CreateLayer(kTestLayerId, /*num_slots=*/100, Layer::DEFAULT,
{CreateLayerMember(kTestLayerMemberId, {{0, 99}})});
auto test_study = CreateTestStudy(
experiments,
CreateLayerMemberReference(kTestLayerId, {kTestLayerMemberId}));
auto test_seed = CreateTestSeed({test_layer}, {test_study});
VariationsLayers layers(test_seed, entropy_providers_);
LimitedLayerEntropyCostTracker limited_entropy_tracker(layers, test_seed, 0);
EXPECT_TRUE(limited_entropy_tracker.TryAddEntropyUsedByStudy(test_study));
EXPECT_EQ(0, limited_entropy_tracker.GetTotalEntropyUsedForTesting());
EXPECT_FALSE(limited_entropy_tracker.IsEntropyLimitReached());
}
TEST_F(LimitedLayerEntropyCostTrackerTest,
TestTryAddEntropyUsedByStudy_NoLayerMembers) {
auto test_layer = CreateLayer(kTestLayerId, /*num_slots=*/100, Layer::LIMITED,
/*layer_members=*/{});
auto test_study = CreateTestStudy(
CreateExperimentsWithTwoBitsOfEntropy(),
CreateLayerMemberReference(kTestLayerId, {kTestLayerMemberId}));
auto test_seed = CreateTestSeed({test_layer}, {test_study});
VariationsLayers layers(test_seed, entropy_providers_);
LimitedLayerEntropyCostTracker limited_entropy_tracker(layers, test_seed, 0);
// Entropy used is zero since no study referencing the LIMITED layer will be
// assigned.
EXPECT_FALSE(limited_entropy_tracker.TryAddEntropyUsedByStudy(test_study));
EXPECT_EQ(0, limited_entropy_tracker.GetTotalEntropyUsedForTesting());
}
TEST_F(LimitedLayerEntropyCostTrackerTest,
TestTryAddEntropyUsedByStudy_StudyNotReferencingLayer) {
std::vector<Study::Experiment> experiments = {
CreateGoogleWebExperiment(25, 100001),
CreateGoogleWebExperiment(25, 200002),
CreateExperiment(50),
};
auto test_layer =
CreateLayer(kTestLayerId, /*num_slots=*/100, Layer::LIMITED,
{CreateLayerMember(kTestLayerMemberId, {{0, 99}})});
auto test_study = CreateTestStudy(experiments);
auto test_seed = CreateTestSeed({test_layer}, {test_study});
VariationsLayers layers(test_seed, entropy_providers_);
LimitedLayerEntropyCostTracker limited_entropy_tracker(layers, test_seed, 0);
EXPECT_TRUE(limited_entropy_tracker.TryAddEntropyUsedByStudy(test_study));
EXPECT_EQ(0, limited_entropy_tracker.GetTotalEntropyUsedForTesting());
EXPECT_FALSE(limited_entropy_tracker.IsEntropyLimitReached());
}
TEST_F(LimitedLayerEntropyCostTrackerTest,
TestTryAddEntropyUsedByStudy_StudyReferencingNoLayerMember) {
std::vector<Study::Experiment> experiments = {
CreateGoogleWebExperiment(25, 100001),
CreateGoogleWebExperiment(25, 200002),
CreateExperiment(50),
};
auto test_layer =
CreateLayer(kTestLayerId, /*num_slots=*/100, Layer::LIMITED,
{CreateLayerMember(kTestLayerMemberId, {{0, 99}})});
auto test_study = CreateTestStudy(
experiments, CreateLayerMemberReference(kTestLayerId, {}));
auto test_seed = CreateTestSeed({test_layer}, {test_study});
VariationsLayers layers(test_seed, entropy_providers_);
LimitedLayerEntropyCostTracker limited_entropy_tracker(layers, test_seed, 0);
EXPECT_TRUE(limited_entropy_tracker.TryAddEntropyUsedByStudy(test_study));
EXPECT_EQ(0, limited_entropy_tracker.GetTotalEntropyUsedForTesting());
EXPECT_FALSE(limited_entropy_tracker.IsEntropyLimitReached());
}
TEST_F(LimitedLayerEntropyCostTrackerTest,
TestTryAddEntropyUsedByStudy_StudyReferencingLimitedLayer) {
std::vector<Study::Experiment> experiments = {
CreateGoogleWebExperiment(25, 100001),
CreateGoogleWebExperiment(25, 200002),
CreateExperiment(50),
};
auto test_layer =
CreateLayer(kTestLayerId, /*num_slots=*/100, Layer::LIMITED,
{CreateLayerMember(kTestLayerMemberId, {{0, 99}})});
auto test_study = CreateTestStudy(
experiments,
CreateLayerMemberReference(kTestLayerId, {kTestLayerMemberId}));
auto test_seed = CreateTestSeed({test_layer}, {test_study});
VariationsLayers layers(test_seed, entropy_providers_);
LimitedLayerEntropyCostTracker limited_entropy_tracker(layers, test_seed, 2);
EXPECT_TRUE(limited_entropy_tracker.TryAddEntropyUsedByStudy(test_study));
EXPECT_EQ(2, limited_entropy_tracker.GetTotalEntropyUsedForTesting());
EXPECT_FALSE(limited_entropy_tracker.IsEntropyLimitReached());
}
TEST_F(LimitedLayerEntropyCostTrackerTest,
TestTryAddEntropyUsedByStudy_StudyReferencingMisconfiguredLimitedLayer) {
std::vector<Study::Experiment> experiments = {
CreateGoogleWebExperiment(25, 100001),
CreateGoogleWebExperiment(25, 200002),
CreateExperiment(50),
};
auto test_layer =
CreateLayer(kTestLayerId, /*num_slots=*/0, Layer::LIMITED,
{CreateLayerMember(kTestLayerMemberId, {{0, 99}})});
auto test_study = CreateTestStudy(
experiments,
CreateLayerMemberReference(kTestLayerId, {kTestLayerMemberId}));
auto test_seed = CreateTestSeed({test_layer}, {test_study});
VariationsLayers layers(test_seed, entropy_providers_);
LimitedLayerEntropyCostTracker limited_entropy_tracker(layers, test_seed, 2);
EXPECT_FALSE(limited_entropy_tracker.TryAddEntropyUsedByStudy(test_study));
EXPECT_EQ(0, limited_entropy_tracker.GetTotalEntropyUsedForTesting());
EXPECT_FALSE(limited_entropy_tracker.IsEntropyLimitReached());
}
TEST_F(LimitedLayerEntropyCostTrackerTest,
TestTryAddEntropyUsedByStudy_WithManyLimitedLayers) {
std::vector<Study::Experiment> experiments = {
CreateGoogleWebExperiment(50, 100001),
CreateExperiment(50),
};
auto test_layer_1 =
CreateLayer(kTestLayerId, /*num_slots=*/100, Layer::LIMITED,
{CreateLayerMember(kTestLayerMemberId, {{0, 99}})});
auto test_layer_2 =
CreateLayer(kTestLayerId + 1, /*num_slots=*/100, Layer::LIMITED,
{CreateLayerMember(kTestLayerMemberId, {{0, 99}})});
auto test_study = CreateTestStudy(
experiments,
CreateLayerMemberReference(kTestLayerId, {kTestLayerMemberId}));
auto test_seed = CreateTestSeed({test_layer_1, test_layer_2}, {test_study});
VariationsLayers layers(test_seed, entropy_providers_);
LimitedLayerEntropyCostTracker limited_entropy_tracker(layers, test_seed, 5);
EXPECT_FALSE(limited_entropy_tracker.TryAddEntropyUsedByStudy(test_study));
EXPECT_EQ(0, limited_entropy_tracker.GetTotalEntropyUsedForTesting());
EXPECT_FALSE(limited_entropy_tracker.IsEntropyLimitReached());
}
TEST_F(LimitedLayerEntropyCostTrackerTest,
TestTryAddEntropyUsedByStudy_MultipleStudies) {
std::vector<Study::Experiment> experiments = {
CreateGoogleWebExperiment(25, 100001),
CreateGoogleWebExperiment(25, 200002),
CreateExperiment(50),
};
auto test_layer =
CreateLayer(kTestLayerId, /*num_slots=*/100, Layer::LIMITED,
{CreateLayerMember(kTestLayerMemberId, {{0, 49}}),
CreateLayerMember(kTestLayerMemberId + 1, {{49, 99}})});
auto test_study_1 = CreateTestStudy(
experiments,
CreateLayerMemberReference(kTestLayerId, {kTestLayerMemberId}));
auto test_study_2 = CreateTestStudy(
experiments,
CreateLayerMemberReference(kTestLayerId,
{kTestLayerMemberId, kTestLayerMemberId + 1}));
auto test_seed = CreateTestSeed({test_layer}, {test_study_1, test_study_2});
VariationsLayers layers(test_seed, entropy_providers_);
LimitedLayerEntropyCostTracker limited_entropy_tracker(layers, test_seed, 5);
EXPECT_TRUE(limited_entropy_tracker.TryAddEntropyUsedByStudy(test_study_1));
EXPECT_EQ(3, limited_entropy_tracker.GetTotalEntropyUsedForTesting());
EXPECT_TRUE(limited_entropy_tracker.TryAddEntropyUsedByStudy(test_study_2));
EXPECT_EQ(5, limited_entropy_tracker.GetTotalEntropyUsedForTesting());
EXPECT_FALSE(limited_entropy_tracker.IsEntropyLimitReached());
}
TEST_F(LimitedLayerEntropyCostTrackerTest,
TestTryAddEntropyUsedByStudy_EntropyLimitReachedByLayerMember) {
std::vector<Study::Experiment> experiments = {
CreateGoogleWebExperiment(25, 100001),
CreateGoogleWebExperiment(25, 200002),
CreateExperiment(50),
};
auto test_layer =
CreateLayer(kTestLayerId, /*num_slots=*/100, Layer::LIMITED,
{CreateLayerMember(kTestLayerMemberId, {{0, 24}}),
CreateLayerMember(kTestLayerMemberId + 1, {{25, 49}}),
CreateLayerMember(kTestLayerMemberId + 2, {{50, 99}})});
auto test_study_1 = CreateTestStudy(
experiments,
CreateLayerMemberReference(kTestLayerId, {kTestLayerMemberId}));
auto test_study_2 = CreateTestStudy(
experiments,
CreateLayerMemberReference(kTestLayerId, {kTestLayerMemberId}));
auto test_seed = CreateTestSeed({test_layer}, {test_study_1, test_study_2});
VariationsLayers layers(test_seed, entropy_providers_);
LimitedLayerEntropyCostTracker limited_entropy_tracker(layers, test_seed, 1);
EXPECT_EQ(0, limited_entropy_tracker.GetTotalEntropyUsedForTesting());
EXPECT_FALSE(limited_entropy_tracker.IsEntropyLimitReached());
EXPECT_FALSE(limited_entropy_tracker.TryAddEntropyUsedByStudy(test_study_1));
EXPECT_EQ(4, limited_entropy_tracker.GetTotalEntropyUsedForTesting());
EXPECT_TRUE(limited_entropy_tracker.IsEntropyLimitReached());
EXPECT_FALSE(limited_entropy_tracker.TryAddEntropyUsedByStudy(test_study_2));
EXPECT_EQ(4, limited_entropy_tracker.GetTotalEntropyUsedForTesting());
EXPECT_TRUE(limited_entropy_tracker.IsEntropyLimitReached());
}
TEST_F(LimitedLayerEntropyCostTrackerTest,
TestTryAddEntropyUsedByStudy_EntropyLimitReachedAfterAddingStudy) {
std::vector<Study::Experiment> experiments = {
CreateGoogleWebExperiment(25, 100001),
CreateGoogleWebExperiment(25, 200002),
CreateExperiment(50),
};
auto test_layer =
CreateLayer(kTestLayerId, /*num_slots=*/100, Layer::LIMITED,
{CreateLayerMember(kTestLayerMemberId, {{0, 99}})});
auto test_study_1 = CreateTestStudy(
experiments,
CreateLayerMemberReference(kTestLayerId, {kTestLayerMemberId}));
auto test_study_2 = CreateTestStudy(
experiments,
CreateLayerMemberReference(kTestLayerId, {kTestLayerMemberId}));
auto test_seed = CreateTestSeed({test_layer}, {test_study_1, test_study_2});
VariationsLayers layers(test_seed, entropy_providers_);
LimitedLayerEntropyCostTracker limited_entropy_tracker(layers, test_seed, 3);
EXPECT_TRUE(limited_entropy_tracker.TryAddEntropyUsedByStudy(test_study_1));
EXPECT_EQ(2, limited_entropy_tracker.GetTotalEntropyUsedForTesting());
EXPECT_FALSE(limited_entropy_tracker.IsEntropyLimitReached());
EXPECT_FALSE(limited_entropy_tracker.TryAddEntropyUsedByStudy(test_study_2));
EXPECT_EQ(4, limited_entropy_tracker.GetTotalEntropyUsedForTesting());
EXPECT_TRUE(limited_entropy_tracker.IsEntropyLimitReached());
}
TEST_F(
LimitedLayerEntropyCostTrackerTest,
TestTryAddEntropyUsedByStudy_StudyNotReferencingLimitedLayerAndEntropyLimitIsReached) {
std::vector<Study::Experiment> experiments = {
CreateGoogleWebExperiment(25, 100001),
CreateGoogleWebExperiment(25, 200002),
CreateExperiment(50),
};
auto test_layer_1 =
CreateLayer(kTestLayerId, /*num_slots=*/100, Layer::LIMITED,
{CreateLayerMember(kTestLayerMemberId, {{0, 99}})});
auto test_layer_2 =
CreateLayer(kTestLayerId + 1, /*num_slots=*/100, Layer::DEFAULT,
{CreateLayerMember(kTestLayerMemberId, {{0, 99}})});
auto test_study_1 = CreateTestStudy(
experiments,
CreateLayerMemberReference(kTestLayerId, {kTestLayerMemberId}));
auto test_study_2 = CreateTestStudy(
experiments,
CreateLayerMemberReference(kTestLayerId + 1, {kTestLayerMemberId}));
auto test_seed = CreateTestSeed({test_layer_1, test_layer_2},
{test_study_1, test_study_2});
VariationsLayers layers(test_seed, entropy_providers_);
LimitedLayerEntropyCostTracker limited_entropy_tracker(layers, test_seed, 1);
EXPECT_FALSE(limited_entropy_tracker.TryAddEntropyUsedByStudy(test_study_1));
EXPECT_EQ(2, limited_entropy_tracker.GetTotalEntropyUsedForTesting());
EXPECT_TRUE(limited_entropy_tracker.IsEntropyLimitReached());
EXPECT_TRUE(limited_entropy_tracker.TryAddEntropyUsedByStudy(test_study_2));
EXPECT_EQ(2, limited_entropy_tracker.GetTotalEntropyUsedForTesting());
EXPECT_TRUE(limited_entropy_tracker.IsEntropyLimitReached());
}
TEST_F(LimitedLayerEntropyCostTrackerTest,
TestTryAddEntropyUsedByStudy_MultipleExperimentsWithID) {
std::vector<Study::Experiment> experiments = {
CreateGoogleWebExperiment(125, 100001),
CreateGoogleWebExperiment(125, 100002),
CreateGoogleWebExperiment(250, 200001),
CreateGoogleWebExperiment(250, 200002),
CreateExperiment(250),
};
auto test_layer =
CreateLayer(kTestLayerId, /*num_slots=*/100, Layer::LIMITED,
{CreateLayerMember(kTestLayerMemberId, {{0, 99}})});
auto test_study = CreateTestStudy(
experiments,
CreateLayerMemberReference(kTestLayerId, {kTestLayerMemberId}));
auto test_seed = CreateTestSeed({test_layer}, {test_study});
VariationsLayers layers(test_seed, entropy_providers_);
LimitedLayerEntropyCostTracker limited_entropy_tracker(layers, test_seed, 13);
EXPECT_TRUE(limited_entropy_tracker.TryAddEntropyUsedByStudy(test_study));
EXPECT_EQ(3, limited_entropy_tracker.GetTotalEntropyUsedForTesting());
}
TEST_F(LimitedLayerEntropyCostTrackerTest,
TestTryAddEntropyUsedByStudy_NoGoogleWebExperimentID) {
// Experiments without google_web_experiment_id are excluded from entropy
// calculation.
std::vector<Study::Experiment> experiments = {
CreateExperiment(10), CreateExperiment(20), CreateExperiment(30),
CreateExperiment(40)};
auto test_layer =
CreateLayer(kTestLayerId, /*num_slots=*/100, Layer::LIMITED,
{CreateLayerMember(kTestLayerMemberId, {{0, 99}})});
auto test_study = CreateTestStudy(
experiments,
CreateLayerMemberReference(kTestLayerId, {kTestLayerMemberId}));
auto test_seed = CreateTestSeed({test_layer}, {test_study});
VariationsLayers layers(test_seed, entropy_providers_);
LimitedLayerEntropyCostTracker limited_entropy_tracker(layers, test_seed, 13);
EXPECT_TRUE(limited_entropy_tracker.TryAddEntropyUsedByStudy(test_study));
EXPECT_EQ(0, limited_entropy_tracker.GetTotalEntropyUsedForTesting());
}
TEST_F(LimitedLayerEntropyCostTrackerTest,
TestTryAddEntropyUsedByStudy_SkipZeroProbabilityWeightedStudies) {
std::vector<Study::Experiment> experiments = {
CreateGoogleWebExperiment(0, 100001), CreateExperiment(100)};
auto test_layer =
CreateLayer(kTestLayerId, /*num_slots=*/100, Layer::LIMITED,
{CreateLayerMember(kTestLayerMemberId, {{0, 99}})});
auto test_study = CreateTestStudy(
experiments,
CreateLayerMemberReference(kTestLayerId, {kTestLayerMemberId}));
auto test_seed = CreateTestSeed({test_layer}, {test_study});
VariationsLayers layers(test_seed, entropy_providers_);
LimitedLayerEntropyCostTracker limited_entropy_tracker(layers, test_seed, 13);
EXPECT_TRUE(limited_entropy_tracker.TryAddEntropyUsedByStudy(test_study));
EXPECT_EQ(0, limited_entropy_tracker.GetTotalEntropyUsedForTesting());
}
TEST_F(LimitedLayerEntropyCostTrackerTest,
TestTryAddEntropyUsedByStudy_NoExperiments) {
std::vector<Study::Experiment> experiments;
auto test_layer =
CreateLayer(kTestLayerId, /*num_slots=*/100, Layer::LIMITED,
{CreateLayerMember(kTestLayerMemberId, {{0, 99}})});
auto test_study = CreateTestStudy(
experiments,
CreateLayerMemberReference(kTestLayerId, {kTestLayerMemberId}));
auto test_seed = CreateTestSeed({test_layer}, {test_study});
VariationsLayers layers(test_seed, entropy_providers_);
LimitedLayerEntropyCostTracker limited_entropy_tracker(layers, test_seed, 13);
EXPECT_TRUE(limited_entropy_tracker.TryAddEntropyUsedByStudy(test_study));
EXPECT_EQ(0, limited_entropy_tracker.GetTotalEntropyUsedForTesting());
}
TEST_F(LimitedLayerEntropyCostTrackerTest,
TestTryAddEntropyUsedByStudy_WithGoogleWebTriggerExpID) {
std::vector<Study::Experiment> experiments = {
CreateTriggerExperiment(25, 100001), CreateTriggerExperiment(25, 100002),
CreateExperiment(50)};
auto test_layer =
CreateLayer(kTestLayerId, /*num_slots=*/100, Layer::LIMITED,
{CreateLayerMember(kTestLayerMemberId, {{0, 99}})});
auto test_study = CreateTestStudy(
experiments,
CreateLayerMemberReference(kTestLayerId, {kTestLayerMemberId}));
auto test_seed = CreateTestSeed({test_layer}, {test_study});
VariationsLayers layers(test_seed, entropy_providers_);
LimitedLayerEntropyCostTracker limited_entropy_tracker(layers, test_seed, 13);
EXPECT_TRUE(limited_entropy_tracker.TryAddEntropyUsedByStudy(test_study));
EXPECT_EQ(2, limited_entropy_tracker.GetTotalEntropyUsedForTesting());
}
TEST_F(LimitedLayerEntropyCostTrackerTest,
TestTryAddEntropyUsedByStudy_TestEntropyUsedByLimitedLayer) {
auto experiments = CreateExperimentsWithTwoBitsOfEntropy();
// Creates a layer with LIMITED entropy mode that takes 1 bit of entropy from
// the layer member.
auto test_layer =
CreateLayer(kTestLayerId, /*num_slots=*/100, Layer::LIMITED,
{CreateLayerMember(kTestLayerMemberId, {{0, 49}})});
auto test_study = CreateTestStudy(
experiments,
CreateLayerMemberReference(kTestLayerId, {kTestLayerMemberId}));
auto test_seed = CreateTestSeed({test_layer}, {test_study});
VariationsLayers layers(test_seed, entropy_providers_);
LimitedLayerEntropyCostTracker limited_entropy_tracker(layers, test_seed, 13);
// Expecting 3 bits of total usage with 2 bits from the study, and 1 bit from
// the layer member.
EXPECT_TRUE(limited_entropy_tracker.TryAddEntropyUsedByStudy(test_study));
EXPECT_EQ(3, limited_entropy_tracker.GetTotalEntropyUsedForTesting());
}
TEST_F(LimitedLayerEntropyCostTrackerTest,
TestTryAddEntropyUsedByStudy_StudiesOfDifferentEntropyInLayerMember) {
auto test_layer =
CreateLayer(kTestLayerId, /*num_slots=*/100, Layer::LIMITED,
{CreateLayerMember(kTestLayerMemberId, {{0, 49}})});
auto test_study_1 = CreateTestStudy(
CreateExperimentsWithTwoBitsOfEntropy(),
CreateLayerMemberReference(kTestLayerId, {kTestLayerMemberId}));
auto test_study_2 = CreateTestStudy(
CreateExperimentsWithTwoBitsOfEntropy(),
CreateLayerMemberReference(kTestLayerId, {kTestLayerMemberId}));
auto test_seed = CreateTestSeed({test_layer}, {test_study_1, test_study_2});
VariationsLayers layers(test_seed, entropy_providers_);
LimitedLayerEntropyCostTracker limited_entropy_tracker(layers, test_seed, 5);
// Expecting 5 bits of total usage with 4 bits from the two 2-bit studies, and
// 1 bit from the layer member.
EXPECT_TRUE(limited_entropy_tracker.TryAddEntropyUsedByStudy(test_study_1));
EXPECT_TRUE(limited_entropy_tracker.TryAddEntropyUsedByStudy(test_study_2));
EXPECT_EQ(5, limited_entropy_tracker.GetTotalEntropyUsedForTesting());
}
TEST_F(LimitedLayerEntropyCostTrackerTest,
TestTryAddEntropyUsedByStudy_MultipleLayerMembers) {
auto test_layer = CreateLayer(
kTestLayerId, /*num_slots=*/100, Layer::LIMITED,
{CreateLayerMember(1, {{0, 49}}), CreateLayerMember(2, {{50, 74}}),
CreateLayerMember(3, {{75, 99}})});
auto test_seed = CreateTestSeed(
{test_layer},
{CreateTestStudy(CreateExperimentsWithTwoBitsOfEntropy(),
CreateLayerMemberReference(kTestLayerId, {0})),
CreateTestStudy(CreateExperimentsWithTwoBitsOfEntropy(),
CreateLayerMemberReference(kTestLayerId, {1})),
CreateTestStudy(CreateExperimentsWithTwoBitsOfEntropy(),
CreateLayerMemberReference(kTestLayerId, {2})),
CreateTestStudy(CreateExperimentsWithTwoBitsOfEntropy(),
CreateLayerMemberReference(kTestLayerId, {2}))});
VariationsLayers layers(test_seed, entropy_providers_);
LimitedLayerEntropyCostTracker limited_entropy_tracker(layers, test_seed, 6);
// Expecting 6 bits of total usage with 4 bits from the two 2-bit studies in
// layer member #2, and 2 bit from the 25% layer member itself.
for (const Study& study : test_seed.study()) {
EXPECT_TRUE(limited_entropy_tracker.TryAddEntropyUsedByStudy(study));
}
EXPECT_EQ(6, limited_entropy_tracker.GetTotalEntropyUsedForTesting());
}
TEST_F(LimitedLayerEntropyCostTrackerTest,
TestTryAddEntropyUsedByStudy_ReferencingMultipleLayers) {
auto test_layer = CreateLayer(
kTestLayerId, /*num_slots=*/100, Layer::LIMITED,
{CreateLayerMember(1, {{0, 49}}), CreateLayerMember(2, {{50, 74}}),
CreateLayerMember(3, {{75, 99}})});
auto test_study_1 =
CreateTestStudy(CreateExperimentsWithTwoBitsOfEntropy(),
CreateLayerMemberReference(kTestLayerId,
/*layer_member_ids=*/{0, 1}));
auto test_study_2 =
CreateTestStudy(CreateExperimentsWithTwoBitsOfEntropy(),
CreateLayerMemberReference(kTestLayerId,
/*layer_member_ids=*/{2}));
auto test_seed = CreateTestSeed({test_layer}, {test_study_1, test_study_2});
VariationsLayers layers(test_seed, entropy_providers_);
LimitedLayerEntropyCostTracker limited_entropy_tracker(layers, test_seed, 4);
// Entropy usages:
// - layer member 1:
// 1 bit from the layer member + 2 bits from the first study = 3 bits.
// - layer member 2:
// 2 bit from the layer member + 2 bits from the first study = 4 bits.
// - layer member 3:
// 2 bit from the layer member + 2 bits from the second study = 4 bits.
// - Therefore the layer uses a maximum of 4 bits.
EXPECT_TRUE(limited_entropy_tracker.TryAddEntropyUsedByStudy(test_study_1));
EXPECT_TRUE(limited_entropy_tracker.TryAddEntropyUsedByStudy(test_study_2));
EXPECT_EQ(4, limited_entropy_tracker.GetTotalEntropyUsedForTesting());
}
TEST_F(LimitedLayerEntropyCostTrackerTest,
TestTryAddEntropyUsedByStudy_SomeStudiesDoNotReferenceLayer) {
auto test_layer =
CreateLayer(kTestLayerId, /*num_slots=*/100, Layer::LIMITED,
{CreateLayerMember(kTestLayerMemberId, {{0, 49}})});
auto test_study_1 = CreateTestStudy(
CreateExperimentsWithTwoBitsOfEntropy(),
CreateLayerMemberReference(kTestLayerId, {kTestLayerMemberId}));
auto test_study_2 = CreateTestStudy(CreateExperimentsWithTwoBitsOfEntropy());
auto test_seed = CreateTestSeed({test_layer}, {test_study_1, test_study_2});
VariationsLayers layers(test_seed, entropy_providers_);
LimitedLayerEntropyCostTracker limited_entropy_tracker(layers, test_seed, 3);
// 1 bit from the layer member and 2 bits from the studies assigned.
EXPECT_TRUE(limited_entropy_tracker.TryAddEntropyUsedByStudy(test_study_1));
EXPECT_TRUE(limited_entropy_tracker.TryAddEntropyUsedByStudy(test_study_2));
EXPECT_EQ(3, limited_entropy_tracker.GetTotalEntropyUsedForTesting());
}
TEST_F(LimitedLayerEntropyCostTrackerTest,
TestTryAddEntropyUsedByStudy_SomeStudiesReferenceOtherLayers) {
int limited_layer_id = kTestLayerId;
int default_layer_id = kTestLayerId + 1;
auto test_limited_layer =
CreateLayer(limited_layer_id, /*num_slots=*/100, Layer::LIMITED,
{CreateLayerMember(kTestLayerMemberId, {{0, 49}})});
auto test_default_layer =
CreateLayer(default_layer_id, /*num_slots=*/100, Layer::DEFAULT,
{CreateLayerMember(kTestLayerMemberId, {{0, 49}})});
auto test_study_1 = CreateTestStudy(
CreateExperimentsWithTwoBitsOfEntropy(),
CreateLayerMemberReference(limited_layer_id, {kTestLayerMemberId}));
auto test_study_2 = CreateTestStudy(
CreateExperimentsWithTwoBitsOfEntropy(),
CreateLayerMemberReference(default_layer_id, {kTestLayerMemberId}));
auto test_seed = CreateTestSeed({test_limited_layer, test_default_layer},
{test_study_1, test_study_2});
VariationsLayers layers(test_seed, entropy_providers_);
LimitedLayerEntropyCostTracker limited_entropy_tracker(layers, test_seed, 3);
// 1 bit from the layer member and 2 bits from the studies assigned to the
// layer with LIMITED entropy mode.
EXPECT_TRUE(limited_entropy_tracker.TryAddEntropyUsedByStudy(test_study_1));
EXPECT_TRUE(limited_entropy_tracker.TryAddEntropyUsedByStudy(test_study_2));
EXPECT_EQ(3, limited_entropy_tracker.GetTotalEntropyUsedForTesting());
}
TEST_F(LimitedLayerEntropyCostTrackerTest,
TestTryAddEntropyUsedByStudy_NoStudiesReferencingLimitedLayer) {
int limited_layer_id = kTestLayerId;
int default_layer_id = kTestLayerId + 1;
auto test_limited_layer =
CreateLayer(limited_layer_id, /*num_slots=*/100, Layer::LIMITED,
{CreateLayerMember(kTestLayerMemberId + 2, {{0, 49}}),
CreateLayerMember(kTestLayerMemberId + 1, {{50, 74}}),
CreateLayerMember(kTestLayerMemberId, {{75, 99}})});
auto test_default_layer =
CreateLayer(default_layer_id, /*num_slots=*/100, Layer::DEFAULT,
{CreateLayerMember(kTestLayerMemberId, {{0, 49}})});
auto test_study_1 = CreateTestStudy(
CreateExperimentsWithTwoBitsOfEntropy(),
CreateLayerMemberReference(default_layer_id, {kTestLayerMemberId}));
auto test_study_2 = CreateTestStudy(
CreateExperimentsWithTwoBitsOfEntropy(),
CreateLayerMemberReference(default_layer_id, {kTestLayerMemberId}));
auto test_seed = CreateTestSeed({test_limited_layer, test_default_layer},
{test_study_1, test_study_2});
VariationsLayers layers(test_seed, entropy_providers_);
LimitedLayerEntropyCostTracker limited_entropy_tracker(layers, test_seed, 2);
// Entropy used is zero since the layer members in the limited layer is
// unused (the studies in `test_seed` is not constrained to a limited layer).
EXPECT_TRUE(limited_entropy_tracker.TryAddEntropyUsedByStudy(test_study_1));
EXPECT_TRUE(limited_entropy_tracker.TryAddEntropyUsedByStudy(test_study_2));
EXPECT_EQ(0, limited_entropy_tracker.GetTotalEntropyUsedForTesting());
}
TEST_F(
LimitedLayerEntropyCostTrackerTest,
TestTryAddEntropyUsedByStudy_NoReferencingStudiesWithGoogleExperimentID) {
auto test_limited_layer =
CreateLayer(kTestLayerId, /*num_slots=*/100, Layer::LIMITED,
{CreateLayerMember(kTestLayerMemberId + 2, {{0, 49}}),
CreateLayerMember(kTestLayerMemberId + 1, {{50, 74}}),
CreateLayerMember(kTestLayerMemberId, {{75, 99}})});
auto test_study = CreateTestStudy(
{CreateExperiment(1), CreateExperiment(1)},
CreateLayerMemberReference(kTestLayerId, {kTestLayerMemberId}));
auto test_seed = CreateTestSeed({test_limited_layer}, {test_study});
VariationsLayers layers(test_seed, entropy_providers_);
LimitedLayerEntropyCostTracker limited_entropy_tracker(layers, test_seed, 2);
// Without Google experiment IDs, a study that is constrained to a limited
// layer does not use entropy. Entropy usage is zero if none of the studies in
// any layer members use entropy.
EXPECT_TRUE(limited_entropy_tracker.TryAddEntropyUsedByStudy(test_study));
EXPECT_EQ(0, limited_entropy_tracker.GetTotalEntropyUsedForTesting());
}
} // namespace variations
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