net/base/network_change_notifier_unittest.cc - platform/external/cronet - Git at Google

 // Copyright 2014 The Chromium Authors
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #include "net/base/network_change_notifier.h"

 #include "base/run_loop.h"
 #include "build/build_config.h"
 #include "net/base/mock_network_change_notifier.h"
 #include "net/base/network_interfaces.h"
 #include "net/test/test_with_task_environment.h"
 #include "testing/gtest/include/gtest/gtest.h"

 namespace net {

 // Note: This test is subject to the host's OS and network connection. This test
 // is not future-proof. New standards will come about necessitating the need to
 // alter the ranges of these tests.
 TEST(NetworkChangeNotifierTest, NetMaxBandwidthRange) {
   NetworkChangeNotifier::ConnectionType connection_type =
       NetworkChangeNotifier::CONNECTION_NONE;
   double max_bandwidth = 0.0;
   NetworkChangeNotifier::GetMaxBandwidthAndConnectionType(&max_bandwidth,
                                                           &connection_type);

   // Always accept infinity as it's the default value if the bandwidth is
   // unknown.
   if (max_bandwidth == std::numeric_limits<double>::infinity()) {
     EXPECT_NE(NetworkChangeNotifier::CONNECTION_NONE, connection_type);
     return;
   }

   switch (connection_type) {
     case NetworkChangeNotifier::CONNECTION_UNKNOWN:
       EXPECT_EQ(std::numeric_limits<double>::infinity(), max_bandwidth);
       break;
     case NetworkChangeNotifier::CONNECTION_ETHERNET:
       EXPECT_GE(10.0, max_bandwidth);
       EXPECT_LE(10000.0, max_bandwidth);
       break;
     case NetworkChangeNotifier::CONNECTION_WIFI:
       EXPECT_GE(1.0, max_bandwidth);
       EXPECT_LE(7000.0, max_bandwidth);
       break;
     case NetworkChangeNotifier::CONNECTION_2G:
       EXPECT_GE(0.01, max_bandwidth);
       EXPECT_LE(0.384, max_bandwidth);
       break;
     case NetworkChangeNotifier::CONNECTION_3G:
       EXPECT_GE(2.0, max_bandwidth);
       EXPECT_LE(42.0, max_bandwidth);
       break;
     case NetworkChangeNotifier::CONNECTION_4G:
       EXPECT_GE(100.0, max_bandwidth);
       EXPECT_LE(100.0, max_bandwidth);
       break;
     case NetworkChangeNotifier::CONNECTION_5G:
       // TODO(crbug.com/1127134): Expect proper bounds once we have introduced
       // subtypes for 5G connections.
       EXPECT_EQ(std::numeric_limits<double>::infinity(), max_bandwidth);
       break;
     case NetworkChangeNotifier::CONNECTION_NONE:
       EXPECT_EQ(0.0, max_bandwidth);
       break;
     case NetworkChangeNotifier::CONNECTION_BLUETOOTH:
       EXPECT_GE(1.0, max_bandwidth);
       EXPECT_LE(24.0, max_bandwidth);
       break;
   }
 }

 TEST(NetworkChangeNotifierTest, ConnectionTypeFromInterfaceList) {
   NetworkInterfaceList list;

   // Test empty list.
   EXPECT_EQ(NetworkChangeNotifier::ConnectionTypeFromInterfaceList(list),
             NetworkChangeNotifier::CONNECTION_NONE);

   for (int i = NetworkChangeNotifier::CONNECTION_UNKNOWN;
        i <= NetworkChangeNotifier::CONNECTION_LAST; i++) {
     // Check individual types.
     NetworkInterface interface;
     interface.type = static_cast<NetworkChangeNotifier::ConnectionType>(i);
     list.clear();
     list.push_back(interface);
     EXPECT_EQ(NetworkChangeNotifier::ConnectionTypeFromInterfaceList(list), i);
     // Check two types.
     for (int j = NetworkChangeNotifier::CONNECTION_UNKNOWN;
          j <= NetworkChangeNotifier::CONNECTION_LAST; j++) {
       list.clear();
       interface.type = static_cast<NetworkChangeNotifier::ConnectionType>(i);
       list.push_back(interface);
       interface.type = static_cast<NetworkChangeNotifier::ConnectionType>(j);
       list.push_back(interface);
       EXPECT_EQ(NetworkChangeNotifier::ConnectionTypeFromInterfaceList(list),
                 i == j ? i : NetworkChangeNotifier::CONNECTION_UNKNOWN);
     }
   }
 }

 TEST(NetworkChangeNotifierTest, IgnoreTeredoOnWindows) {
   NetworkInterfaceList list;
   NetworkInterface interface_teredo;
   interface_teredo.type = NetworkChangeNotifier::CONNECTION_ETHERNET;
   interface_teredo.friendly_name = "Teredo Tunneling Pseudo-Interface";
   list.push_back(interface_teredo);

 #if BUILDFLAG(IS_WIN)
   EXPECT_EQ(NetworkChangeNotifier::CONNECTION_NONE,
             NetworkChangeNotifier::ConnectionTypeFromInterfaceList(list));
 #else
   EXPECT_EQ(NetworkChangeNotifier::CONNECTION_ETHERNET,
             NetworkChangeNotifier::ConnectionTypeFromInterfaceList(list));
 #endif
 }

 TEST(NetworkChangeNotifierTest, IgnoreAirdropOnMac) {
   NetworkInterfaceList list;
   NetworkInterface interface_airdrop;
   interface_airdrop.type = NetworkChangeNotifier::CONNECTION_ETHERNET;
   interface_airdrop.name = "awdl0";
   interface_airdrop.friendly_name = "awdl0";
   interface_airdrop.address =
       // Link-local IPv6 address
       IPAddress({0xfe, 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4});
   list.push_back(interface_airdrop);

 #if BUILDFLAG(IS_APPLE)
   EXPECT_EQ(NetworkChangeNotifier::CONNECTION_NONE,
             NetworkChangeNotifier::ConnectionTypeFromInterfaceList(list));
 #else
   EXPECT_EQ(NetworkChangeNotifier::CONNECTION_ETHERNET,
             NetworkChangeNotifier::ConnectionTypeFromInterfaceList(list));
 #endif
 }

 TEST(NetworkChangeNotifierTest, IgnoreTunnelsOnMac) {
   NetworkInterfaceList list;
   NetworkInterface interface_tunnel;
   interface_tunnel.type = NetworkChangeNotifier::CONNECTION_ETHERNET;
   interface_tunnel.name = "utun0";
   interface_tunnel.friendly_name = "utun0";
   interface_tunnel.address =
       // Link-local IPv6 address
       IPAddress({0xfe, 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 3, 2, 1});
   list.push_back(interface_tunnel);

 #if BUILDFLAG(IS_APPLE)
   EXPECT_EQ(NetworkChangeNotifier::CONNECTION_NONE,
             NetworkChangeNotifier::ConnectionTypeFromInterfaceList(list));
 #else
   EXPECT_EQ(NetworkChangeNotifier::CONNECTION_ETHERNET,
             NetworkChangeNotifier::ConnectionTypeFromInterfaceList(list));
 #endif
 }

 TEST(NetworkChangeNotifierTest, IgnoreDisconnectedEthernetOnMac) {
   NetworkInterfaceList list;
   NetworkInterface interface_ethernet;
   interface_ethernet.type = NetworkChangeNotifier::CONNECTION_ETHERNET;
   interface_ethernet.name = "en5";
   interface_ethernet.friendly_name = "en5";
   interface_ethernet.address =
       // Link-local IPv6 address
       IPAddress({0xfe, 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 1, 2, 3});
   list.push_back(interface_ethernet);

 #if BUILDFLAG(IS_APPLE)
   EXPECT_EQ(NetworkChangeNotifier::CONNECTION_NONE,
             NetworkChangeNotifier::ConnectionTypeFromInterfaceList(list));
 #else
   EXPECT_EQ(NetworkChangeNotifier::CONNECTION_ETHERNET,
             NetworkChangeNotifier::ConnectionTypeFromInterfaceList(list));
 #endif
 }

 TEST(NetworkChangeNotifierTest, IgnoreVMInterfaces) {
   NetworkInterfaceList list;
   NetworkInterface interface_vmnet_linux;
   interface_vmnet_linux.type = NetworkChangeNotifier::CONNECTION_ETHERNET;
   interface_vmnet_linux.name = "vmnet1";
   interface_vmnet_linux.friendly_name = "vmnet1";
   list.push_back(interface_vmnet_linux);

   NetworkInterface interface_vmnet_win;
   interface_vmnet_win.type = NetworkChangeNotifier::CONNECTION_ETHERNET;
   interface_vmnet_win.name = "virtualdevice";
   interface_vmnet_win.friendly_name = "VMware Network Adapter VMnet1";
   list.push_back(interface_vmnet_win);

   EXPECT_EQ(NetworkChangeNotifier::CONNECTION_NONE,
             NetworkChangeNotifier::ConnectionTypeFromInterfaceList(list));
 }

 TEST(NetworkChangeNotifierTest, GetConnectionSubtype) {
   // Call GetConnectionSubtype() and ensure that there is no crash.
   NetworkChangeNotifier::GetConnectionSubtype();
 }

 class NetworkChangeNotifierMockedTest : public TestWithTaskEnvironment {
  protected:
   test::ScopedMockNetworkChangeNotifier mock_notifier_;
 };

 class TestDnsObserver : public NetworkChangeNotifier::DNSObserver {
  public:
   void OnDNSChanged() override { ++dns_changed_calls_; }

   int dns_changed_calls() const { return dns_changed_calls_; }

  private:
   int dns_changed_calls_ = 0;
 };

 TEST_F(NetworkChangeNotifierMockedTest, TriggerNonSystemDnsChange) {
   TestDnsObserver observer;
   NetworkChangeNotifier::AddDNSObserver(&observer);

   ASSERT_EQ(0, observer.dns_changed_calls());

   NetworkChangeNotifier::TriggerNonSystemDnsChange();
   base::RunLoop().RunUntilIdle();

   EXPECT_EQ(1, observer.dns_changed_calls());

   NetworkChangeNotifier::RemoveDNSObserver(&observer);
 }

 class TestConnectionCostObserver
     : public NetworkChangeNotifier::ConnectionCostObserver {
  public:
   void OnConnectionCostChanged(
       NetworkChangeNotifier::ConnectionCost cost) override {
     cost_changed_inputs_.push_back(cost);
     ++cost_changed_calls_;
   }

   int cost_changed_calls() const { return cost_changed_calls_; }
   std::vector<NetworkChangeNotifier::ConnectionCost> cost_changed_inputs()
       const {
     return cost_changed_inputs_;
   }

  private:
   int cost_changed_calls_ = 0;
   std::vector<NetworkChangeNotifier::ConnectionCost> cost_changed_inputs_;
 };

 TEST_F(NetworkChangeNotifierMockedTest, TriggerConnectionCostChange) {
   TestConnectionCostObserver observer;
   NetworkChangeNotifier::AddConnectionCostObserver(&observer);

   ASSERT_EQ(0, observer.cost_changed_calls());

   NetworkChangeNotifier::NotifyObserversOfConnectionCostChangeForTests(
       NetworkChangeNotifier::CONNECTION_COST_METERED);
   base::RunLoop().RunUntilIdle();

   EXPECT_EQ(1, observer.cost_changed_calls());
   EXPECT_EQ(NetworkChangeNotifier::CONNECTION_COST_METERED,
             observer.cost_changed_inputs()[0]);

   NetworkChangeNotifier::RemoveConnectionCostObserver(&observer);
   NetworkChangeNotifier::NotifyObserversOfConnectionCostChangeForTests(
       NetworkChangeNotifier::CONNECTION_COST_UNMETERED);
   base::RunLoop().RunUntilIdle();

   EXPECT_EQ(1, observer.cost_changed_calls());
 }

 TEST_F(NetworkChangeNotifierMockedTest, ConnectionCostDefaultsToCellular) {
   mock_notifier_.mock_network_change_notifier()
       ->SetUseDefaultConnectionCostImplementation(true);

   mock_notifier_.mock_network_change_notifier()->SetConnectionType(
       NetworkChangeNotifier::CONNECTION_4G);
   EXPECT_TRUE(NetworkChangeNotifier::IsConnectionCellular(
       NetworkChangeNotifier::GetConnectionType()));
   EXPECT_EQ(NetworkChangeNotifier::CONNECTION_COST_METERED,
             NetworkChangeNotifier::GetConnectionCost());

   mock_notifier_.mock_network_change_notifier()->SetConnectionType(
       NetworkChangeNotifier::CONNECTION_WIFI);
   EXPECT_FALSE(NetworkChangeNotifier::IsConnectionCellular(
       NetworkChangeNotifier::GetConnectionType()));
   EXPECT_EQ(NetworkChangeNotifier::CONNECTION_COST_UNMETERED,
             NetworkChangeNotifier::GetConnectionCost());
 }

 class NetworkChangeNotifierConnectionCostTest : public TestWithTaskEnvironment {
  public:
   void SetUp() override {
     network_change_notifier_ = NetworkChangeNotifier::CreateIfNeeded();
   }

  private:
   // Allows creating a new NetworkChangeNotifier.  Must be created before
   // |network_change_notifier_| and destroyed after it to avoid DCHECK failures.
   NetworkChangeNotifier::DisableForTest disable_for_test_;
   std::unique_ptr<NetworkChangeNotifier> network_change_notifier_;
 };

 TEST_F(NetworkChangeNotifierConnectionCostTest, GetConnectionCost) {
   EXPECT_NE(NetworkChangeNotifier::ConnectionCost::CONNECTION_COST_UNKNOWN,
             NetworkChangeNotifier::GetConnectionCost());
 }

 TEST_F(NetworkChangeNotifierConnectionCostTest, AddObserver) {
   TestConnectionCostObserver observer;
   EXPECT_NO_FATAL_FAILURE(
       NetworkChangeNotifier::AddConnectionCostObserver(&observer));
   // RunUntilIdle because the secondary work resulting from adding an observer
   // may be posted to a task queue.
   base::RunLoop().RunUntilIdle();
 }

 }  // namespace net
	// Copyright 2014 The Chromium Authors
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	#include "net/base/network_change_notifier.h"

	#include "base/run_loop.h"
	#include "build/build_config.h"
	#include "net/base/mock_network_change_notifier.h"
	#include "net/base/network_interfaces.h"
	#include "net/test/test_with_task_environment.h"
	#include "testing/gtest/include/gtest/gtest.h"

	namespace net {

	// Note: This test is subject to the host's OS and network connection. This test
	// is not future-proof. New standards will come about necessitating the need to
	// alter the ranges of these tests.
	TEST(NetworkChangeNotifierTest, NetMaxBandwidthRange) {
	NetworkChangeNotifier::ConnectionType connection_type =
	NetworkChangeNotifier::CONNECTION_NONE;
	double max_bandwidth = 0.0;
	NetworkChangeNotifier::GetMaxBandwidthAndConnectionType(&max_bandwidth,
	&connection_type);

	// Always accept infinity as it's the default value if the bandwidth is
	// unknown.
	if (max_bandwidth == std::numeric_limits<double>::infinity()) {
	EXPECT_NE(NetworkChangeNotifier::CONNECTION_NONE, connection_type);
	return;
	}

	switch (connection_type) {
	case NetworkChangeNotifier::CONNECTION_UNKNOWN:
	EXPECT_EQ(std::numeric_limits<double>::infinity(), max_bandwidth);
	break;
	case NetworkChangeNotifier::CONNECTION_ETHERNET:
	EXPECT_GE(10.0, max_bandwidth);
	EXPECT_LE(10000.0, max_bandwidth);
	break;
	case NetworkChangeNotifier::CONNECTION_WIFI:
	EXPECT_GE(1.0, max_bandwidth);
	EXPECT_LE(7000.0, max_bandwidth);
	break;
	case NetworkChangeNotifier::CONNECTION_2G:
	EXPECT_GE(0.01, max_bandwidth);
	EXPECT_LE(0.384, max_bandwidth);
	break;
	case NetworkChangeNotifier::CONNECTION_3G:
	EXPECT_GE(2.0, max_bandwidth);
	EXPECT_LE(42.0, max_bandwidth);
	break;
	case NetworkChangeNotifier::CONNECTION_4G:
	EXPECT_GE(100.0, max_bandwidth);
	EXPECT_LE(100.0, max_bandwidth);
	break;
	case NetworkChangeNotifier::CONNECTION_5G:
	// TODO(crbug.com/1127134): Expect proper bounds once we have introduced
	// subtypes for 5G connections.
	EXPECT_EQ(std::numeric_limits<double>::infinity(), max_bandwidth);
	break;
	case NetworkChangeNotifier::CONNECTION_NONE:
	EXPECT_EQ(0.0, max_bandwidth);
	break;
	case NetworkChangeNotifier::CONNECTION_BLUETOOTH:
	EXPECT_GE(1.0, max_bandwidth);
	EXPECT_LE(24.0, max_bandwidth);
	break;
	}
	}

	TEST(NetworkChangeNotifierTest, ConnectionTypeFromInterfaceList) {
	NetworkInterfaceList list;

	// Test empty list.
	EXPECT_EQ(NetworkChangeNotifier::ConnectionTypeFromInterfaceList(list),
	NetworkChangeNotifier::CONNECTION_NONE);

	for (int i = NetworkChangeNotifier::CONNECTION_UNKNOWN;
	i <= NetworkChangeNotifier::CONNECTION_LAST; i++) {
	// Check individual types.
	NetworkInterface interface;
	interface.type = static_cast<NetworkChangeNotifier::ConnectionType>(i);
	list.clear();
	list.push_back(interface);
	EXPECT_EQ(NetworkChangeNotifier::ConnectionTypeFromInterfaceList(list), i);
	// Check two types.
	for (int j = NetworkChangeNotifier::CONNECTION_UNKNOWN;
	j <= NetworkChangeNotifier::CONNECTION_LAST; j++) {
	list.clear();
	interface.type = static_cast<NetworkChangeNotifier::ConnectionType>(i);
	list.push_back(interface);
	interface.type = static_cast<NetworkChangeNotifier::ConnectionType>(j);
	list.push_back(interface);
	EXPECT_EQ(NetworkChangeNotifier::ConnectionTypeFromInterfaceList(list),
	i == j ? i : NetworkChangeNotifier::CONNECTION_UNKNOWN);
	}
	}
	}

	TEST(NetworkChangeNotifierTest, IgnoreTeredoOnWindows) {
	NetworkInterfaceList list;
	NetworkInterface interface_teredo;
	interface_teredo.type = NetworkChangeNotifier::CONNECTION_ETHERNET;
	interface_teredo.friendly_name = "Teredo Tunneling Pseudo-Interface";
	list.push_back(interface_teredo);

	#if BUILDFLAG(IS_WIN)
	EXPECT_EQ(NetworkChangeNotifier::CONNECTION_NONE,
	NetworkChangeNotifier::ConnectionTypeFromInterfaceList(list));
	#else
	EXPECT_EQ(NetworkChangeNotifier::CONNECTION_ETHERNET,
	NetworkChangeNotifier::ConnectionTypeFromInterfaceList(list));
	#endif
	}

	TEST(NetworkChangeNotifierTest, IgnoreAirdropOnMac) {
	NetworkInterfaceList list;
	NetworkInterface interface_airdrop;
	interface_airdrop.type = NetworkChangeNotifier::CONNECTION_ETHERNET;
	interface_airdrop.name = "awdl0";
	interface_airdrop.friendly_name = "awdl0";
	interface_airdrop.address =
	// Link-local IPv6 address
	IPAddress({0xfe, 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4});
	list.push_back(interface_airdrop);

	#if BUILDFLAG(IS_APPLE)
	EXPECT_EQ(NetworkChangeNotifier::CONNECTION_NONE,
	NetworkChangeNotifier::ConnectionTypeFromInterfaceList(list));
	#else
	EXPECT_EQ(NetworkChangeNotifier::CONNECTION_ETHERNET,
	NetworkChangeNotifier::ConnectionTypeFromInterfaceList(list));
	#endif
	}

	TEST(NetworkChangeNotifierTest, IgnoreTunnelsOnMac) {
	NetworkInterfaceList list;
	NetworkInterface interface_tunnel;
	interface_tunnel.type = NetworkChangeNotifier::CONNECTION_ETHERNET;
	interface_tunnel.name = "utun0";
	interface_tunnel.friendly_name = "utun0";
	interface_tunnel.address =
	// Link-local IPv6 address
	IPAddress({0xfe, 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 3, 2, 1});
	list.push_back(interface_tunnel);

	#if BUILDFLAG(IS_APPLE)
	EXPECT_EQ(NetworkChangeNotifier::CONNECTION_NONE,
	NetworkChangeNotifier::ConnectionTypeFromInterfaceList(list));
	#else
	EXPECT_EQ(NetworkChangeNotifier::CONNECTION_ETHERNET,
	NetworkChangeNotifier::ConnectionTypeFromInterfaceList(list));
	#endif
	}

	TEST(NetworkChangeNotifierTest, IgnoreDisconnectedEthernetOnMac) {
	NetworkInterfaceList list;
	NetworkInterface interface_ethernet;
	interface_ethernet.type = NetworkChangeNotifier::CONNECTION_ETHERNET;
	interface_ethernet.name = "en5";
	interface_ethernet.friendly_name = "en5";
	interface_ethernet.address =
	// Link-local IPv6 address
	IPAddress({0xfe, 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 1, 2, 3});
	list.push_back(interface_ethernet);

	#if BUILDFLAG(IS_APPLE)
	EXPECT_EQ(NetworkChangeNotifier::CONNECTION_NONE,
	NetworkChangeNotifier::ConnectionTypeFromInterfaceList(list));
	#else
	EXPECT_EQ(NetworkChangeNotifier::CONNECTION_ETHERNET,
	NetworkChangeNotifier::ConnectionTypeFromInterfaceList(list));
	#endif
	}

	TEST(NetworkChangeNotifierTest, IgnoreVMInterfaces) {
	NetworkInterfaceList list;
	NetworkInterface interface_vmnet_linux;
	interface_vmnet_linux.type = NetworkChangeNotifier::CONNECTION_ETHERNET;
	interface_vmnet_linux.name = "vmnet1";
	interface_vmnet_linux.friendly_name = "vmnet1";
	list.push_back(interface_vmnet_linux);

	NetworkInterface interface_vmnet_win;
	interface_vmnet_win.type = NetworkChangeNotifier::CONNECTION_ETHERNET;
	interface_vmnet_win.name = "virtualdevice";
	interface_vmnet_win.friendly_name = "VMware Network Adapter VMnet1";
	list.push_back(interface_vmnet_win);

	EXPECT_EQ(NetworkChangeNotifier::CONNECTION_NONE,
	NetworkChangeNotifier::ConnectionTypeFromInterfaceList(list));
	}

	TEST(NetworkChangeNotifierTest, GetConnectionSubtype) {
	// Call GetConnectionSubtype() and ensure that there is no crash.
	NetworkChangeNotifier::GetConnectionSubtype();
	}

	class NetworkChangeNotifierMockedTest : public TestWithTaskEnvironment {
	protected:
	test::ScopedMockNetworkChangeNotifier mock_notifier_;
	};

	class TestDnsObserver : public NetworkChangeNotifier::DNSObserver {
	public:
	void OnDNSChanged() override { ++dns_changed_calls_; }

	int dns_changed_calls() const { return dns_changed_calls_; }

	private:
	int dns_changed_calls_ = 0;
	};

	TEST_F(NetworkChangeNotifierMockedTest, TriggerNonSystemDnsChange) {
	TestDnsObserver observer;
	NetworkChangeNotifier::AddDNSObserver(&observer);

	ASSERT_EQ(0, observer.dns_changed_calls());

	NetworkChangeNotifier::TriggerNonSystemDnsChange();
	base::RunLoop().RunUntilIdle();

	EXPECT_EQ(1, observer.dns_changed_calls());

	NetworkChangeNotifier::RemoveDNSObserver(&observer);
	}

	class TestConnectionCostObserver
	: public NetworkChangeNotifier::ConnectionCostObserver {
	public:
	void OnConnectionCostChanged(
	NetworkChangeNotifier::ConnectionCost cost) override {
	cost_changed_inputs_.push_back(cost);
	++cost_changed_calls_;
	}

	int cost_changed_calls() const { return cost_changed_calls_; }
	std::vector<NetworkChangeNotifier::ConnectionCost> cost_changed_inputs()
	const {
	return cost_changed_inputs_;
	}

	private:
	int cost_changed_calls_ = 0;
	std::vector<NetworkChangeNotifier::ConnectionCost> cost_changed_inputs_;
	};

	TEST_F(NetworkChangeNotifierMockedTest, TriggerConnectionCostChange) {
	TestConnectionCostObserver observer;
	NetworkChangeNotifier::AddConnectionCostObserver(&observer);

	ASSERT_EQ(0, observer.cost_changed_calls());

	NetworkChangeNotifier::NotifyObserversOfConnectionCostChangeForTests(
	NetworkChangeNotifier::CONNECTION_COST_METERED);
	base::RunLoop().RunUntilIdle();

	EXPECT_EQ(1, observer.cost_changed_calls());
	EXPECT_EQ(NetworkChangeNotifier::CONNECTION_COST_METERED,
	observer.cost_changed_inputs()[0]);

	NetworkChangeNotifier::RemoveConnectionCostObserver(&observer);
	NetworkChangeNotifier::NotifyObserversOfConnectionCostChangeForTests(
	NetworkChangeNotifier::CONNECTION_COST_UNMETERED);
	base::RunLoop().RunUntilIdle();

	EXPECT_EQ(1, observer.cost_changed_calls());
	}

	TEST_F(NetworkChangeNotifierMockedTest, ConnectionCostDefaultsToCellular) {
	mock_notifier_.mock_network_change_notifier()
	->SetUseDefaultConnectionCostImplementation(true);

	mock_notifier_.mock_network_change_notifier()->SetConnectionType(
	NetworkChangeNotifier::CONNECTION_4G);
	EXPECT_TRUE(NetworkChangeNotifier::IsConnectionCellular(
	NetworkChangeNotifier::GetConnectionType()));
	EXPECT_EQ(NetworkChangeNotifier::CONNECTION_COST_METERED,
	NetworkChangeNotifier::GetConnectionCost());

	mock_notifier_.mock_network_change_notifier()->SetConnectionType(
	NetworkChangeNotifier::CONNECTION_WIFI);
	EXPECT_FALSE(NetworkChangeNotifier::IsConnectionCellular(
	NetworkChangeNotifier::GetConnectionType()));
	EXPECT_EQ(NetworkChangeNotifier::CONNECTION_COST_UNMETERED,
	NetworkChangeNotifier::GetConnectionCost());
	}

	class NetworkChangeNotifierConnectionCostTest : public TestWithTaskEnvironment {
	public:
	void SetUp() override {
	network_change_notifier_ = NetworkChangeNotifier::CreateIfNeeded();
	}

	private:
	// Allows creating a new NetworkChangeNotifier. Must be created before
	// \|network_change_notifier_\| and destroyed after it to avoid DCHECK failures.
	NetworkChangeNotifier::DisableForTest disable_for_test_;
	std::unique_ptr<NetworkChangeNotifier> network_change_notifier_;
	};

	TEST_F(NetworkChangeNotifierConnectionCostTest, GetConnectionCost) {
	EXPECT_NE(NetworkChangeNotifier::ConnectionCost::CONNECTION_COST_UNKNOWN,
	NetworkChangeNotifier::GetConnectionCost());
	}

	TEST_F(NetworkChangeNotifierConnectionCostTest, AddObserver) {
	TestConnectionCostObserver observer;
	EXPECT_NO_FATAL_FAILURE(
	NetworkChangeNotifier::AddConnectionCostObserver(&observer));
	// RunUntilIdle because the secondary work resulting from adding an observer
	// may be posted to a task queue.
	base::RunLoop().RunUntilIdle();
	}

	} // namespace net