content/browser/geolocation/network_location_provider_unittest.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/json/json_reader.h"
   6 #include "base/json/json_writer.h"
   7 #include "base/memory/scoped_ptr.h"
   8 #include "base/strings/string_number_conversions.h"
   9 #include "base/strings/string_util.h"
  10 #include "base/strings/stringprintf.h"
  11 #include "base/strings/utf_string_conversions.h"
  12 #include "base/values.h"
  13 #include "content/browser/geolocation/fake_access_token_store.h"
  14 #include "content/browser/geolocation/location_arbitrator_impl.h"
  15 #include "content/browser/geolocation/network_location_provider.h"
  16 #include "content/browser/geolocation/wifi_data_provider.h"
  17 #include "net/url_request/test_url_fetcher_factory.h"
  18 #include "net/url_request/url_request_status.h"
  19 #include "testing/gtest/include/gtest/gtest.h"
  20
  21 namespace content {
  22
  23 // Constants used in multiple tests.
  24 const char kTestServerUrl[] = "https://www.geolocation.test/service";
  25 const char kAccessTokenString[] = "accessToken";
  26
  27 // Using #define so we can easily paste this into various other strings.
  28 #define REFERENCE_ACCESS_TOKEN "2:k7j3G6LaL6u_lafw:4iXOeOpTh1glSXe"
  29
  30 // Stops the specified (nested) message loop when the listener is called back.
  31 class MessageLoopQuitListener {
  32  public:
  33   MessageLoopQuitListener()
  34       : client_message_loop_(base::MessageLoop::current()),
  35         updated_provider_(NULL) {
  36     CHECK(client_message_loop_);
  37   }
  38
  39   void OnLocationUpdate(const LocationProvider* provider,
  40                         const Geoposition& position) {
  41     EXPECT_EQ(client_message_loop_, base::MessageLoop::current());
  42     updated_provider_ = provider;
  43     client_message_loop_->Quit();
  44   }
  45
  46   base::MessageLoop* client_message_loop_;
  47   const LocationProvider* updated_provider_;
  48 };
  49
  50 // A mock implementation of WifiDataProvider for testing. Adapted from
  51 // http://gears.googlecode.com/svn/trunk/gears/geolocation/geolocation_test.cc
  52 class MockWifiDataProvider : public WifiDataProvider {
  53  public:
  54   // Factory method for use with WifiDataProvider::SetFactoryForTesting.
  55   static WifiDataProvider* GetInstance() {
  56     CHECK(instance_);
  57     return instance_;
  58   }
  59
  60   static MockWifiDataProvider* CreateInstance() {
  61     CHECK(!instance_);
  62     instance_ = new MockWifiDataProvider;
  63     return instance_;
  64   }
  65
  66   MockWifiDataProvider() : start_calls_(0), stop_calls_(0), got_data_(true) {}
  67
  68   // WifiDataProvider implementation.
  69   void StartDataProvider() override { ++start_calls_; }
  70
  71   void StopDataProvider() override { ++stop_calls_; }
  72
  73   bool GetData(WifiData* data_out) override {
  74     CHECK(data_out);
  75     *data_out = data_;
  76     return got_data_;
  77   }
  78
  79   void SetData(const WifiData& new_data) {
  80     got_data_ = true;
  81     const bool differs = data_.DiffersSignificantly(new_data);
  82     data_ = new_data;
  83     if (differs)
  84       this->RunCallbacks();
  85   }
  86
  87   void set_got_data(bool got_data) { got_data_ = got_data; }
  88   int start_calls_;
  89   int stop_calls_;
  90
  91  private:
  92   ~MockWifiDataProvider() override {
  93     CHECK(this == instance_);
  94     instance_ = NULL;
  95   }
  96
  97   static MockWifiDataProvider* instance_;
  98
  99   WifiData data_;
 100   bool got_data_;
 101
 102   DISALLOW_COPY_AND_ASSIGN(MockWifiDataProvider);
 103 };
 104
 105 MockWifiDataProvider* MockWifiDataProvider::instance_ = NULL;
 106
 107 // Main test fixture
 108 class GeolocationNetworkProviderTest : public testing::Test {
 109  public:
 110   virtual void SetUp() {
 111     test_server_url_ = GURL(kTestServerUrl);
 112     access_token_store_ = new FakeAccessTokenStore;
 113     wifi_data_provider_ = MockWifiDataProvider::CreateInstance();
 114   }
 115
 116   virtual void TearDown() { WifiDataProviderManager::ResetFactoryForTesting(); }
 117
 118   LocationProvider* CreateProvider(bool set_permission_granted) {
 119     LocationProvider* provider = NewNetworkLocationProvider(
 120         access_token_store_.get(),
 121         NULL,  // No URLContextGetter needed, as using test urlfecther factory.
 122         test_server_url_,
 123         access_token_store_->access_token_set_[test_server_url_]);
 124     if (set_permission_granted)
 125       provider->OnPermissionGranted();
 126     return provider;
 127   }
 128
 129  protected:
 130   GeolocationNetworkProviderTest() {
 131     // TODO(joth): Really these should be in SetUp, not here, but they take no
 132     // effect on Mac OS Release builds if done there. I kid not. Figure out why.
 133     WifiDataProviderManager::SetFactoryForTesting(
 134         MockWifiDataProvider::GetInstance);
 135   }
 136
 137   // Returns the current url fetcher (if any) and advances the id ready for the
 138   // next test step.
 139   net::TestURLFetcher* get_url_fetcher_and_advance_id() {
 140     net::TestURLFetcher* fetcher = url_fetcher_factory_.GetFetcherByID(
 141             NetworkLocationRequest::url_fetcher_id_for_tests);
 142     if (fetcher)
 143       ++NetworkLocationRequest::url_fetcher_id_for_tests;
 144     return fetcher;
 145   }
 146
 147   static int IndexToChannel(int index) { return index + 4; }
 148
 149   // Creates wifi data containing the specified number of access points, with
 150   // some differentiating charactistics in each.
 151   static WifiData CreateReferenceWifiScanData(int ap_count) {
 152     WifiData data;
 153     for (int i = 0; i < ap_count; ++i) {
 154       AccessPointData ap;
 155       ap.mac_address =
 156           base::ASCIIToUTF16(base::StringPrintf("%02d-34-56-78-54-32", i));
 157       ap.radio_signal_strength = ap_count - i;
 158       ap.channel = IndexToChannel(i);
 159       ap.signal_to_noise = i + 42;
 160       ap.ssid = base::ASCIIToUTF16("Some nice+network|name\\");
 161       data.access_point_data.insert(ap);
 162     }
 163     return data;
 164   }
 165
 166   static void CreateReferenceWifiScanDataJson(
 167       int ap_count, int start_index, base::ListValue* wifi_access_point_list) {
 168     std::vector<std::string> wifi_data;
 169     for (int i = 0; i < ap_count; ++i) {
 170       base::DictionaryValue* ap = new base::DictionaryValue();
 171       ap->SetString("macAddress", base::StringPrintf("%02d-34-56-78-54-32", i));
 172       ap->SetInteger("signalStrength", start_index + ap_count - i);
 173       ap->SetInteger("age", 0);
 174       ap->SetInteger("channel", IndexToChannel(i));
 175       ap->SetInteger("signalToNoiseRatio", i + 42);
 176       wifi_access_point_list->Append(ap);
 177     }
 178   }
 179
 180   static Geoposition CreateReferencePosition(int id) {
 181     Geoposition pos;
 182     pos.latitude = id;
 183     pos.longitude = -(id + 1);
 184     pos.altitude = 2 * id;
 185     pos.timestamp = base::Time::Now();
 186     return pos;
 187   }
 188
 189   static std::string PrettyJson(const base::Value& value) {
 190     std::string pretty;
 191     base::JSONWriter::WriteWithOptions(
 192         &value, base::JSONWriter::OPTIONS_PRETTY_PRINT, &pretty);
 193     return pretty;
 194   }
 195
 196   static testing::AssertionResult JsonGetList(
 197       const std::string& field,
 198       const base::DictionaryValue& dict,
 199       const base::ListValue** output_list) {
 200     if (!dict.GetList(field, output_list))
 201       return testing::AssertionFailure() << "Dictionary " << PrettyJson(dict)
 202                                          << " is missing list field " << field;
 203     return testing::AssertionSuccess();
 204   }
 205
 206   static testing::AssertionResult JsonFieldEquals(
 207       const std::string& field,
 208       const base::DictionaryValue& expected,
 209       const base::DictionaryValue& actual) {
 210     const base::Value* expected_value;
 211     const base::Value* actual_value;
 212     if (!expected.Get(field, &expected_value))
 213       return testing::AssertionFailure()
 214           << "Expected dictionary " << PrettyJson(expected)
 215           << " is missing field " << field;
 216     if (!expected.Get(field, &actual_value))
 217       return testing::AssertionFailure()
 218           << "Actual dictionary " << PrettyJson(actual)
 219           << " is missing field " << field;
 220     if (!expected_value->Equals(actual_value))
 221       return testing::AssertionFailure()
 222           << "Field " << field << " mismatch: " << PrettyJson(*expected_value)
 223           << " != " << PrettyJson(*actual_value);
 224     return testing::AssertionSuccess();
 225   }
 226
 227   static GURL UrlWithoutQuery(const GURL& url) {
 228     url::Replacements<char> replacements;
 229     replacements.ClearQuery();
 230     return url.ReplaceComponents(replacements);
 231   }
 232
 233   testing::AssertionResult IsTestServerUrl(const GURL& request_url) {
 234     const GURL a(UrlWithoutQuery(test_server_url_));
 235     const GURL b(UrlWithoutQuery(request_url));
 236     if (a == b)
 237       return testing::AssertionSuccess();
 238     return testing::AssertionFailure() << a << " != " << b;
 239   }
 240
 241   void CheckRequestIsValid(const net::TestURLFetcher& request,
 242                            int expected_routers,
 243                            int expected_wifi_aps,
 244                            int wifi_start_index,
 245                            const std::string& expected_access_token) {
 246     const GURL& request_url = request.GetOriginalURL();
 247
 248     EXPECT_TRUE(IsTestServerUrl(request_url));
 249
 250     // Check to see that the api key is being appended for the default
 251     // network provider url.
 252     bool is_default_url = UrlWithoutQuery(request_url) ==
 253         UrlWithoutQuery(LocationArbitratorImpl::DefaultNetworkProviderURL());
 254     EXPECT_EQ(is_default_url, !request_url.query().empty());
 255
 256     const std::string& upload_data = request.upload_data();
 257     ASSERT_FALSE(upload_data.empty());
 258     std::string json_parse_error_msg;
 259     scoped_ptr<base::Value> parsed_json(
 260         base::JSONReader::ReadAndReturnError(
 261             upload_data,
 262             base::JSON_PARSE_RFC,
 263             NULL,
 264             &json_parse_error_msg));
 265     EXPECT_TRUE(json_parse_error_msg.empty());
 266     ASSERT_TRUE(parsed_json.get() != NULL);
 267
 268     const base::DictionaryValue* request_json;
 269     ASSERT_TRUE(parsed_json->GetAsDictionary(&request_json));
 270
 271     if (!is_default_url) {
 272       if (expected_access_token.empty())
 273         ASSERT_FALSE(request_json->HasKey(kAccessTokenString));
 274       else {
 275         std::string access_token;
 276         EXPECT_TRUE(request_json->GetString(kAccessTokenString, &access_token));
 277         EXPECT_EQ(expected_access_token, access_token);
 278       }
 279     }
 280
 281     if (expected_wifi_aps) {
 282       base::ListValue expected_wifi_aps_json;
 283       CreateReferenceWifiScanDataJson(
 284           expected_wifi_aps,
 285           wifi_start_index,
 286           &expected_wifi_aps_json);
 287       EXPECT_EQ(size_t(expected_wifi_aps), expected_wifi_aps_json.GetSize());
 288
 289       const base::ListValue* wifi_aps_json;
 290       ASSERT_TRUE(JsonGetList("wifiAccessPoints", *request_json,
 291                               &wifi_aps_json));
 292       for (size_t i = 0; i < expected_wifi_aps_json.GetSize(); ++i ) {
 293         const base::DictionaryValue* expected_json;
 294         ASSERT_TRUE(expected_wifi_aps_json.GetDictionary(i, &expected_json));
 295         const base::DictionaryValue* actual_json;
 296         ASSERT_TRUE(wifi_aps_json->GetDictionary(i, &actual_json));
 297         ASSERT_TRUE(JsonFieldEquals("macAddress", *expected_json,
 298                                     *actual_json));
 299         ASSERT_TRUE(JsonFieldEquals("signalStrength", *expected_json,
 300                                     *actual_json));
 301         ASSERT_TRUE(JsonFieldEquals("channel", *expected_json, *actual_json));
 302         ASSERT_TRUE(JsonFieldEquals("signalToNoiseRatio", *expected_json,
 303                                     *actual_json));
 304       }
 305     } else {
 306       ASSERT_FALSE(request_json->HasKey("wifiAccessPoints"));
 307     }
 308     EXPECT_TRUE(request_url.is_valid());
 309   }
 310
 311   GURL test_server_url_;
 312   base::MessageLoop main_message_loop_;
 313   scoped_refptr<FakeAccessTokenStore> access_token_store_;
 314   net::TestURLFetcherFactory url_fetcher_factory_;
 315   scoped_refptr<MockWifiDataProvider> wifi_data_provider_;
 316 };
 317
 318 TEST_F(GeolocationNetworkProviderTest, CreateDestroy) {
 319   // Test fixture members were SetUp correctly.
 320   EXPECT_EQ(&main_message_loop_, base::MessageLoop::current());
 321   scoped_ptr<LocationProvider> provider(CreateProvider(true));
 322   EXPECT_TRUE(NULL != provider.get());
 323   provider.reset();
 324   SUCCEED();
 325 }
 326
 327 TEST_F(GeolocationNetworkProviderTest, StartProvider) {
 328   scoped_ptr<LocationProvider> provider(CreateProvider(true));
 329   EXPECT_TRUE(provider->StartProvider(false));
 330   net::TestURLFetcher* fetcher = get_url_fetcher_and_advance_id();
 331   ASSERT_TRUE(fetcher != NULL);
 332   CheckRequestIsValid(*fetcher, 0, 0, 0, std::string());
 333 }
 334
 335 TEST_F(GeolocationNetworkProviderTest, StartProviderDefaultUrl) {
 336   test_server_url_ = LocationArbitratorImpl::DefaultNetworkProviderURL();
 337   scoped_ptr<LocationProvider> provider(CreateProvider(true));
 338   EXPECT_TRUE(provider->StartProvider(false));
 339   net::TestURLFetcher* fetcher = get_url_fetcher_and_advance_id();
 340   ASSERT_TRUE(fetcher != NULL);
 341   CheckRequestIsValid(*fetcher, 0, 0, 0, std::string());
 342 }
 343
 344 TEST_F(GeolocationNetworkProviderTest, StartProviderLongRequest) {
 345   scoped_ptr<LocationProvider> provider(CreateProvider(true));
 346   EXPECT_TRUE(provider->StartProvider(false));
 347   const int kFirstScanAps = 20;
 348   wifi_data_provider_->SetData(CreateReferenceWifiScanData(kFirstScanAps));
 349   main_message_loop_.RunUntilIdle();
 350   net::TestURLFetcher* fetcher = get_url_fetcher_and_advance_id();
 351   ASSERT_TRUE(fetcher != NULL);
 352   // The request url should have been shortened to less than 2048 characters
 353   // in length by not including access points with the lowest signal strength
 354   // in the request.
 355   EXPECT_LT(fetcher->GetOriginalURL().spec().size(), size_t(2048));
 356   CheckRequestIsValid(*fetcher, 0, 16, 4, std::string());
 357 }
 358
 359 TEST_F(GeolocationNetworkProviderTest, MultipleWifiScansComplete) {
 360   scoped_ptr<LocationProvider> provider(CreateProvider(true));
 361   EXPECT_TRUE(provider->StartProvider(false));
 362
 363   net::TestURLFetcher* fetcher = get_url_fetcher_and_advance_id();
 364   ASSERT_TRUE(fetcher != NULL);
 365   EXPECT_TRUE(IsTestServerUrl(fetcher->GetOriginalURL()));
 366
 367   // Complete the network request with bad position fix.
 368   const char* kNoFixNetworkResponse =
 369       "{"
 370       "  \"status\": \"ZERO_RESULTS\""
 371       "}";
 372   fetcher->set_url(test_server_url_);
 373   fetcher->set_status(net::URLRequestStatus());
 374   fetcher->set_response_code(200);  // OK
 375   fetcher->SetResponseString(kNoFixNetworkResponse);
 376   fetcher->delegate()->OnURLFetchComplete(fetcher);
 377
 378   Geoposition position;
 379   provider->GetPosition(&position);
 380   EXPECT_FALSE(position.Validate());
 381
 382   // Now wifi data arrives -- SetData will notify listeners.
 383   const int kFirstScanAps = 6;
 384   wifi_data_provider_->SetData(CreateReferenceWifiScanData(kFirstScanAps));
 385   main_message_loop_.RunUntilIdle();
 386   fetcher = get_url_fetcher_and_advance_id();
 387   ASSERT_TRUE(fetcher != NULL);
 388   // The request should have the wifi data.
 389   CheckRequestIsValid(*fetcher, 0, kFirstScanAps, 0, std::string());
 390
 391   // Send a reply with good position fix.
 392   const char* kReferenceNetworkResponse =
 393       "{"
 394       "  \"accessToken\": \"" REFERENCE_ACCESS_TOKEN "\","
 395       "  \"accuracy\": 1200.4,"
 396       "  \"location\": {"
 397       "    \"lat\": 51.0,"
 398       "    \"lng\": -0.1"
 399       "  }"
 400       "}";
 401   fetcher->set_url(test_server_url_);
 402   fetcher->set_status(net::URLRequestStatus());
 403   fetcher->set_response_code(200);  // OK
 404   fetcher->SetResponseString(kReferenceNetworkResponse);
 405   fetcher->delegate()->OnURLFetchComplete(fetcher);
 406
 407   provider->GetPosition(&position);
 408   EXPECT_EQ(51.0, position.latitude);
 409   EXPECT_EQ(-0.1, position.longitude);
 410   EXPECT_EQ(1200.4, position.accuracy);
 411   EXPECT_FALSE(position.timestamp.is_null());
 412   EXPECT_TRUE(position.Validate());
 413
 414   // Token should be in the store.
 415   EXPECT_EQ(base::UTF8ToUTF16(REFERENCE_ACCESS_TOKEN),
 416             access_token_store_->access_token_set_[test_server_url_]);
 417
 418   // Wifi updated again, with one less AP. This is 'close enough' to the
 419   // previous scan, so no new request made.
 420   const int kSecondScanAps = kFirstScanAps - 1;
 421   wifi_data_provider_->SetData(CreateReferenceWifiScanData(kSecondScanAps));
 422   main_message_loop_.RunUntilIdle();
 423   fetcher = get_url_fetcher_and_advance_id();
 424   EXPECT_FALSE(fetcher);
 425
 426   provider->GetPosition(&position);
 427   EXPECT_EQ(51.0, position.latitude);
 428   EXPECT_EQ(-0.1, position.longitude);
 429   EXPECT_TRUE(position.Validate());
 430
 431   // Now a third scan with more than twice the original amount -> new request.
 432   const int kThirdScanAps = kFirstScanAps * 2 + 1;
 433   wifi_data_provider_->SetData(CreateReferenceWifiScanData(kThirdScanAps));
 434   main_message_loop_.RunUntilIdle();
 435   fetcher = get_url_fetcher_and_advance_id();
 436   EXPECT_TRUE(fetcher);
 437   CheckRequestIsValid(*fetcher, 0, kThirdScanAps, 0, REFERENCE_ACCESS_TOKEN);
 438   // ...reply with a network error.
 439
 440   fetcher->set_url(test_server_url_);
 441   fetcher->set_status(net::URLRequestStatus(net::URLRequestStatus::FAILED, -1));
 442   fetcher->set_response_code(200);  // should be ignored
 443   fetcher->SetResponseString(std::string());
 444   fetcher->delegate()->OnURLFetchComplete(fetcher);
 445
 446   // Error means we now no longer have a fix.
 447   provider->GetPosition(&position);
 448   EXPECT_FALSE(position.Validate());
 449
 450   // Wifi scan returns to original set: should be serviced from cache.
 451   wifi_data_provider_->SetData(CreateReferenceWifiScanData(kFirstScanAps));
 452   main_message_loop_.RunUntilIdle();
 453   EXPECT_FALSE(get_url_fetcher_and_advance_id());  // No new request created.
 454
 455   provider->GetPosition(&position);
 456   EXPECT_EQ(51.0, position.latitude);
 457   EXPECT_EQ(-0.1, position.longitude);
 458   EXPECT_TRUE(position.Validate());
 459 }
 460
 461 TEST_F(GeolocationNetworkProviderTest, NoRequestOnStartupUntilWifiData) {
 462   MessageLoopQuitListener listener;
 463   wifi_data_provider_->set_got_data(false);
 464   scoped_ptr<LocationProvider> provider(CreateProvider(true));
 465   EXPECT_TRUE(provider->StartProvider(false));
 466
 467   provider->SetUpdateCallback(base::Bind(
 468       &MessageLoopQuitListener::OnLocationUpdate, base::Unretained(&listener)));
 469
 470   main_message_loop_.RunUntilIdle();
 471   EXPECT_FALSE(get_url_fetcher_and_advance_id())
 472       << "Network request should not be created right away on startup when "
 473          "wifi data has not yet arrived";
 474
 475   wifi_data_provider_->SetData(CreateReferenceWifiScanData(1));
 476   main_message_loop_.RunUntilIdle();
 477   EXPECT_TRUE(get_url_fetcher_and_advance_id());
 478 }
 479
 480 TEST_F(GeolocationNetworkProviderTest, NewDataReplacesExistingNetworkRequest) {
 481   // Send initial request with empty data
 482   scoped_ptr<LocationProvider> provider(CreateProvider(true));
 483   EXPECT_TRUE(provider->StartProvider(false));
 484   net::TestURLFetcher* fetcher = get_url_fetcher_and_advance_id();
 485   EXPECT_TRUE(fetcher);
 486
 487   // Now wifi data arrives; new request should be sent.
 488   wifi_data_provider_->SetData(CreateReferenceWifiScanData(4));
 489   main_message_loop_.RunUntilIdle();
 490   fetcher = get_url_fetcher_and_advance_id();
 491   EXPECT_TRUE(fetcher);
 492 }
 493
 494 TEST_F(GeolocationNetworkProviderTest, NetworkRequestDeferredForPermission) {
 495   scoped_ptr<LocationProvider> provider(CreateProvider(false));
 496   EXPECT_TRUE(provider->StartProvider(false));
 497   net::TestURLFetcher* fetcher = get_url_fetcher_and_advance_id();
 498   EXPECT_FALSE(fetcher);
 499   provider->OnPermissionGranted();
 500
 501   fetcher = get_url_fetcher_and_advance_id();
 502   ASSERT_TRUE(fetcher != NULL);
 503
 504   EXPECT_TRUE(IsTestServerUrl(fetcher->GetOriginalURL()));
 505 }
 506
 507 TEST_F(GeolocationNetworkProviderTest,
 508        NetworkRequestWithWifiDataDeferredForPermission) {
 509   access_token_store_->access_token_set_[test_server_url_] =
 510       base::UTF8ToUTF16(REFERENCE_ACCESS_TOKEN);
 511   scoped_ptr<LocationProvider> provider(CreateProvider(false));
 512   EXPECT_TRUE(provider->StartProvider(false));
 513   net::TestURLFetcher* fetcher = get_url_fetcher_and_advance_id();
 514   EXPECT_FALSE(fetcher);
 515
 516   static const int kScanCount = 4;
 517   wifi_data_provider_->SetData(CreateReferenceWifiScanData(kScanCount));
 518   main_message_loop_.RunUntilIdle();
 519
 520   fetcher = get_url_fetcher_and_advance_id();
 521   EXPECT_FALSE(fetcher);
 522
 523   provider->OnPermissionGranted();
 524
 525   fetcher = get_url_fetcher_and_advance_id();
 526   ASSERT_TRUE(fetcher != NULL);
 527
 528   CheckRequestIsValid(*fetcher, 0, kScanCount, 0, REFERENCE_ACCESS_TOKEN);
 529 }
 530
 531 TEST_F(GeolocationNetworkProviderTest, NetworkPositionCache) {
 532   NetworkLocationProvider::PositionCache cache;
 533
 534   const int kCacheSize = NetworkLocationProvider::PositionCache::kMaximumSize;
 535   for (int i = 1; i < kCacheSize * 2 + 1; ++i) {
 536     Geoposition pos = CreateReferencePosition(i);
 537     bool ret = cache.CachePosition(CreateReferenceWifiScanData(i), pos);
 538     EXPECT_TRUE(ret)  << i;
 539     const Geoposition* item =
 540         cache.FindPosition(CreateReferenceWifiScanData(i));
 541     ASSERT_TRUE(item) << i;
 542     EXPECT_EQ(pos.latitude, item->latitude)  << i;
 543     EXPECT_EQ(pos.longitude, item->longitude)  << i;
 544     if (i <= kCacheSize) {
 545       // Nothing should have spilled yet; check oldest item is still there.
 546       EXPECT_TRUE(cache.FindPosition(CreateReferenceWifiScanData(1)));
 547     } else {
 548       const int evicted = i - kCacheSize;
 549       EXPECT_FALSE(cache.FindPosition(CreateReferenceWifiScanData(evicted)));
 550       EXPECT_TRUE(cache.FindPosition(CreateReferenceWifiScanData(evicted + 1)));
 551     }
 552   }
 553 }
 554
 555 }  // namespace content