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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/contextual_search/browser/ctr_aggregator.h"
#include <unordered_map>
#include "base/gtest_prod_util.h"
#include "base/logging.h"
#include "base/values.h"
#include "testing/gtest/include/gtest/gtest.h"
using base::Value;
namespace {
const int kTestWeek = 2500;
}
namespace contextual_search {
class CtrAggregatorTest : public testing::Test {
public:
CtrAggregatorTest() {}
~CtrAggregatorTest() override {}
class WeeklyActivityStorageStub : public WeeklyActivityStorage {
public:
WeeklyActivityStorageStub();
private:
int ReadStorage(std::string storage_bucket) override;
void WriteStorage(std::string storage_key, int value) override;
typedef std::unordered_map<std::string, int> hashmap;
hashmap weeks_;
};
// Test helpers
void Fill4Weeks(); // Fill 4 weeks with 2 impressions, 1 click.
// The class under test.
std::unique_ptr<CtrAggregator> aggregator_;
protected:
// The storage stub.
std::unique_ptr<WeeklyActivityStorage> storage_;
void SetUp() override {
storage_.reset(new WeeklyActivityStorageStub());
aggregator_.reset(new CtrAggregator(*storage_.get(), kTestWeek));
}
void TearDown() override {}
private:
DISALLOW_COPY_AND_ASSIGN(CtrAggregatorTest);
};
CtrAggregatorTest::WeeklyActivityStorageStub::WeeklyActivityStorageStub()
: WeeklyActivityStorage(4) {}
int CtrAggregatorTest::WeeklyActivityStorageStub::ReadStorage(
std::string storage_bucket) {
return weeks_[storage_bucket];
}
void CtrAggregatorTest::WeeklyActivityStorageStub::WriteStorage(
std::string storage_bucket,
int value) {
weeks_[storage_bucket] = value;
}
void CtrAggregatorTest::Fill4Weeks() {
int weeks_to_record = 4;
for (int i = 0; i < weeks_to_record; i++) {
aggregator_->RecordImpression(true);
aggregator_->RecordImpression(false);
EXPECT_FALSE(aggregator_->HasPrevious28DayData());
aggregator_->IncrementWeek(1);
}
EXPECT_TRUE(aggregator_->HasPrevious28DayData());
}
// NaN has the property that it is not equal to itself.
#define EXPECT_NAN(x) EXPECT_NE(x, x)
TEST_F(CtrAggregatorTest, SimpleOperationTest) {
aggregator_->RecordImpression(true);
aggregator_->RecordImpression(false);
EXPECT_FALSE(aggregator_->HasPreviousWeekData());
EXPECT_EQ(0, aggregator_->GetPreviousWeekImpressions());
EXPECT_NAN(aggregator_->GetPreviousWeekCtr());
aggregator_->IncrementWeek(1);
EXPECT_TRUE(aggregator_->HasPreviousWeekData());
EXPECT_EQ(2, aggregator_->GetPreviousWeekImpressions());
EXPECT_FLOAT_EQ(0.5f, aggregator_->GetPreviousWeekCtr());
}
TEST_F(CtrAggregatorTest, MultiWeekTest) {
Fill4Weeks();
aggregator_->RecordImpression(false);
aggregator_->IncrementWeek(1);
EXPECT_TRUE(aggregator_->HasPrevious28DayData());
EXPECT_FLOAT_EQ(static_cast<float>(3.0 / 7),
aggregator_->GetPrevious28DayCtr());
aggregator_->RecordImpression(false);
aggregator_->IncrementWeek(1);
EXPECT_TRUE(aggregator_->HasPrevious28DayData());
EXPECT_FLOAT_EQ(static_cast<float>(2.0 / 6),
aggregator_->GetPrevious28DayCtr());
}
TEST_F(CtrAggregatorTest, SkipOneWeekTest) {
Fill4Weeks();
aggregator_->IncrementWeek(1);
EXPECT_EQ(0, aggregator_->GetPreviousWeekCtr());
EXPECT_FLOAT_EQ(static_cast<float>(3.0 / 6),
aggregator_->GetPrevious28DayCtr());
}
TEST_F(CtrAggregatorTest, SkipThreeWeeksTest) {
Fill4Weeks();
aggregator_->IncrementWeek(3);
EXPECT_EQ(0, aggregator_->GetPreviousWeekCtr());
EXPECT_FLOAT_EQ(static_cast<float>(1.0 / 2),
aggregator_->GetPrevious28DayCtr());
}
TEST_F(CtrAggregatorTest, SkipFourWeeksTest) {
Fill4Weeks();
aggregator_->IncrementWeek(4);
EXPECT_EQ(0, aggregator_->GetPreviousWeekCtr());
EXPECT_EQ(0, aggregator_->GetPrevious28DayCtr());
}
} // namespace contextual_search
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