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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/privacy_budget/surface_set_valuation.h"
#include "chrome/browser/privacy_budget/surface_set_equivalence.h"
#include "chrome/common/privacy_budget/scoped_privacy_budget_config.h"
#include "chrome/common/privacy_budget/types.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/blink/public/common/privacy_budget/identifiable_surface.h"
namespace {
constexpr auto kSurface1 = blink::IdentifiableSurface::FromTypeAndToken(
blink::IdentifiableSurface::Type::kCanvasRenderingContext,
3);
constexpr auto kSurface2 = blink::IdentifiableSurface::FromTypeAndToken(
blink::IdentifiableSurface::Type::kHTMLMediaElement_CanPlayType,
5);
constexpr auto kSurface3 = blink::IdentifiableSurface::FromTypeAndToken(
blink::IdentifiableSurface::Type::kWebFeature,
3);
constexpr auto kSurface4 = blink::IdentifiableSurface::FromTypeAndToken(
blink::IdentifiableSurface::Type::kWebFeature,
4);
} // namespace
TEST(SurfaceSetValuationTest, NoConfig) {
// Verify behavior when there's no server config that defines costing
// parameters. All surfaces should be valued at 1.0.
test::ScopedPrivacyBudgetConfig::Parameters config_params(
test::ScopedPrivacyBudgetConfig::Presets::kEnableRandomSampling);
ASSERT_TRUE(config_params.per_surface_cost.empty());
ASSERT_TRUE(config_params.per_type_cost.empty());
test::ScopedPrivacyBudgetConfig study_configuration(config_params);
SurfaceSetEquivalence equivalence;
SurfaceSetValuation valuation(equivalence);
IdentifiableSurfaceSet surfaces = {kSurface1, kSurface2, kSurface3,
kSurface4};
EXPECT_FLOAT_EQ(1.0, valuation.Cost(kSurface1));
EXPECT_FLOAT_EQ(4.0, valuation.Cost(surfaces));
}
TEST(SurfaceSetValuationTest, PerSurface) {
test::ScopedPrivacyBudgetConfig::Parameters config_params(
test::ScopedPrivacyBudgetConfig::Presets::kEnableRandomSampling);
config_params.per_surface_cost =
IdentifiableSurfaceCostMap{{kSurface1, 0.5}, {kSurface2, 0.25}};
test::ScopedPrivacyBudgetConfig study_configuration(config_params);
SurfaceSetEquivalence equivalence;
SurfaceSetValuation valuation(equivalence);
EXPECT_FLOAT_EQ(0.5, valuation.Cost(kSurface1));
EXPECT_FLOAT_EQ(1.0, valuation.Cost(kSurface4));
EXPECT_FLOAT_EQ(1.75, valuation.Cost(IdentifiableSurfaceSet{
kSurface1, kSurface2, kSurface3}));
}
TEST(SurfaceSetValuationTest, PerType) {
test::ScopedPrivacyBudgetConfig::Parameters config_params(
test::ScopedPrivacyBudgetConfig::Presets::kEnableRandomSampling);
config_params.per_type_cost[blink::IdentifiableSurface::Type::kWebFeature] =
0.25;
test::ScopedPrivacyBudgetConfig study_configuration(config_params);
SurfaceSetEquivalence equivalence;
SurfaceSetValuation valuation(equivalence);
EXPECT_FLOAT_EQ(1.0, valuation.Cost(kSurface1));
EXPECT_FLOAT_EQ(0.25, valuation.Cost(kSurface4));
EXPECT_FLOAT_EQ(2.25, valuation.Cost(IdentifiableSurfaceSet{
kSurface1, kSurface2, kSurface3}));
}
TEST(SurfaceSetValuationTest, ExpectedSurfaceCountForCost) {
EXPECT_EQ(0u, SurfaceSetValuation::ExpectedSurfaceCountForCost(0.0));
EXPECT_EQ(1u, SurfaceSetValuation::ExpectedSurfaceCountForCost(0.5));
EXPECT_EQ(1u, SurfaceSetValuation::ExpectedSurfaceCountForCost(1.0));
EXPECT_EQ(2u, SurfaceSetValuation::ExpectedSurfaceCountForCost(1.4));
EXPECT_EQ(3u, SurfaceSetValuation::ExpectedSurfaceCountForCost(2.1));
}
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