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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/sync_driver/device_count_metrics_provider.h"
#include <string>
#include <vector>
#include "base/bind.h"
#include "base/memory/scoped_ptr.h"
#include "base/test/histogram_tester.h"
#include "components/sync_driver/device_info.h"
#include "components/sync_driver/device_info_tracker.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace sync_driver {
namespace {
class FakeTracker : public DeviceInfoTracker {
public:
explicit FakeTracker(const int count) : count_(count) {}
// DeviceInfoTracker
bool IsSyncing() const override { return false; }
scoped_ptr<DeviceInfo> GetDeviceInfo(
const std::string& client_id) const override {
return scoped_ptr<DeviceInfo>();
}
ScopedVector<DeviceInfo> GetAllDeviceInfo() const override {
return ScopedVector<DeviceInfo>();
}
void AddObserver(Observer* observer) override {}
void RemoveObserver(Observer* observer) override {}
int CountActiveDevices() const override { return count_; }
private:
int count_;
};
} // namespace
class DeviceCountMetricsProviderTest : public testing::Test {
public:
DeviceCountMetricsProviderTest()
: metrics_provider_(
base::Bind(&DeviceCountMetricsProviderTest::GetTrackers,
base::Unretained(this))) {}
void AddTracker(const int count) {
trackers_.push_back(scoped_ptr<DeviceInfoTracker>(new FakeTracker(count)));
}
void GetTrackers(std::vector<const DeviceInfoTracker*>* trackers) {
for (const auto& tracker : trackers_) {
trackers->push_back(tracker.get());
}
}
void TestProvider(int expected_device_count) {
base::HistogramTester histogram_tester;
metrics_provider_.ProvideGeneralMetrics(nullptr);
histogram_tester.ExpectUniqueSample("Sync.DeviceCount",
expected_device_count, 1);
}
private:
DeviceCountMetricsProvider metrics_provider_;
std::vector<scoped_ptr<DeviceInfoTracker>> trackers_;
};
namespace {
TEST_F(DeviceCountMetricsProviderTest, NoTrackers) {
TestProvider(0);
}
TEST_F(DeviceCountMetricsProviderTest, SingleTracker) {
AddTracker(2);
TestProvider(2);
}
TEST_F(DeviceCountMetricsProviderTest, MultipileTrackers) {
AddTracker(1);
AddTracker(5);
AddTracker(-123);
AddTracker(0);
TestProvider(5);
}
TEST_F(DeviceCountMetricsProviderTest, OnlyNegative) {
AddTracker(-123);
TestProvider(0);
}
TEST_F(DeviceCountMetricsProviderTest, VeryLarge) {
AddTracker(123456789);
TestProvider(100);
}
} // namespace
} // namespace sync_driver
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