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   void SetUp() override {
 111     test_server_url_ = GURL(kTestServerUrl);
 112     access_token_store_ = new FakeAccessTokenStore;
 113     wifi_data_provider_ = MockWifiDataProvider::CreateInstance();
 114   }
 115
 116   void TearDown() override {
 117     WifiDataProviderManager::ResetFactoryForTesting();
 118   }
 119
 120   LocationProvider* CreateProvider(bool set_permission_granted) {
 121     LocationProvider* provider = NewNetworkLocationProvider(
 122         access_token_store_.get(),
 123         NULL,  // No URLContextGetter needed, as using test urlfecther factory.
 124         test_server_url_,
 125         access_token_store_->access_token_set_[test_server_url_]);
 126     if (set_permission_granted)
 127       provider->OnPermissionGranted();
 128     return provider;
 129   }
 130
 131  protected:
 132   GeolocationNetworkProviderTest() {
 133     // TODO(joth): Really these should be in SetUp, not here, but they take no
 134     // effect on Mac OS Release builds if done there. I kid not. Figure out why.
 135     WifiDataProviderManager::SetFactoryForTesting(
 136         MockWifiDataProvider::GetInstance);
 137   }
 138
 139   // Returns the current url fetcher (if any) and advances the id ready for the
 140   // next test step.
 141   net::TestURLFetcher* get_url_fetcher_and_advance_id() {
 142     net::TestURLFetcher* fetcher = url_fetcher_factory_.GetFetcherByID(
 143             NetworkLocationRequest::url_fetcher_id_for_tests);
 144     if (fetcher)
 145       ++NetworkLocationRequest::url_fetcher_id_for_tests;
 146     return fetcher;
 147   }
 148
 149   static int IndexToChannel(int index) { return index + 4; }
 150
 151   // Creates wifi data containing the specified number of access points, with
 152   // some differentiating charactistics in each.
 153   static WifiData CreateReferenceWifiScanData(int ap_count) {
 154     WifiData data;
 155     for (int i = 0; i < ap_count; ++i) {
 156       AccessPointData ap;
 157       ap.mac_address =
 158           base::ASCIIToUTF16(base::StringPrintf("%02d-34-56-78-54-32", i));
 159       ap.radio_signal_strength = ap_count - i;
 160       ap.channel = IndexToChannel(i);
 161       ap.signal_to_noise = i + 42;
 162       ap.ssid = base::ASCIIToUTF16("Some nice+network|name\\");
 163       data.access_point_data.insert(ap);
 164     }
 165     return data;
 166   }
 167
 168   static void CreateReferenceWifiScanDataJson(
 169       int ap_count, int start_index, base::ListValue* wifi_access_point_list) {
 170     std::vector<std::string> wifi_data;
 171     for (int i = 0; i < ap_count; ++i) {
 172       base::DictionaryValue* ap = new base::DictionaryValue();
 173       ap->SetString("macAddress", base::StringPrintf("%02d-34-56-78-54-32", i));
 174       ap->SetInteger("signalStrength", start_index + ap_count - i);
 175       ap->SetInteger("age", 0);
 176       ap->SetInteger("channel", IndexToChannel(i));
 177       ap->SetInteger("signalToNoiseRatio", i + 42);
 178       wifi_access_point_list->Append(ap);
 179     }
 180   }
 181
 182   static Geoposition CreateReferencePosition(int id) {
 183     Geoposition pos;
 184     pos.latitude = id;
 185     pos.longitude = -(id + 1);
 186     pos.altitude = 2 * id;
 187     pos.timestamp = base::Time::Now();
 188     return pos;
 189   }
 190
 191   static std::string PrettyJson(const base::Value& value) {
 192     std::string pretty;
 193     base::JSONWriter::WriteWithOptions(
 194         &value, base::JSONWriter::OPTIONS_PRETTY_PRINT, &pretty);
 195     return pretty;
 196   }
 197
 198   static testing::AssertionResult JsonGetList(
 199       const std::string& field,
 200       const base::DictionaryValue& dict,
 201       const base::ListValue** output_list) {
 202     if (!dict.GetList(field, output_list))
 203       return testing::AssertionFailure() << "Dictionary " << PrettyJson(dict)
 204                                          << " is missing list field " << field;
 205     return testing::AssertionSuccess();
 206   }
 207
 208   static testing::AssertionResult JsonFieldEquals(
 209       const std::string& field,
 210       const base::DictionaryValue& expected,
 211       const base::DictionaryValue& actual) {
 212     const base::Value* expected_value;
 213     const base::Value* actual_value;
 214     if (!expected.Get(field, &expected_value))
 215       return testing::AssertionFailure()
 216           << "Expected dictionary " << PrettyJson(expected)
 217           << " is missing field " << field;
 218     if (!expected.Get(field, &actual_value))
 219       return testing::AssertionFailure()
 220           << "Actual dictionary " << PrettyJson(actual)
 221           << " is missing field " << field;
 222     if (!expected_value->Equals(actual_value))
 223       return testing::AssertionFailure()
 224           << "Field " << field << " mismatch: " << PrettyJson(*expected_value)
 225           << " != " << PrettyJson(*actual_value);
 226     return testing::AssertionSuccess();
 227   }
 228
 229   static GURL UrlWithoutQuery(const GURL& url) {
 230     url::Replacements<char> replacements;
 231     replacements.ClearQuery();
 232     return url.ReplaceComponents(replacements);
 233   }
 234
 235   testing::AssertionResult IsTestServerUrl(const GURL& request_url) {
 236     const GURL a(UrlWithoutQuery(test_server_url_));
 237     const GURL b(UrlWithoutQuery(request_url));
 238     if (a == b)
 239       return testing::AssertionSuccess();
 240     return testing::AssertionFailure() << a << " != " << b;
 241   }
 242
 243   void CheckRequestIsValid(const net::TestURLFetcher& request,
 244                            int expected_routers,
 245                            int expected_wifi_aps,
 246                            int wifi_start_index,
 247                            const std::string& expected_access_token) {
 248     const GURL& request_url = request.GetOriginalURL();
 249
 250     EXPECT_TRUE(IsTestServerUrl(request_url));
 251
 252     // Check to see that the api key is being appended for the default
 253     // network provider url.
 254     bool is_default_url = UrlWithoutQuery(request_url) ==
 255         UrlWithoutQuery(LocationArbitratorImpl::DefaultNetworkProviderURL());
 256     EXPECT_EQ(is_default_url, !request_url.query().empty());
 257
 258     const std::string& upload_data = request.upload_data();
 259     ASSERT_FALSE(upload_data.empty());
 260     std::string json_parse_error_msg;
 261     scoped_ptr<base::Value> parsed_json(
 262         base::JSONReader::ReadAndReturnError(
 263             upload_data,
 264             base::JSON_PARSE_RFC,
 265             NULL,
 266             &json_parse_error_msg));
 267     EXPECT_TRUE(json_parse_error_msg.empty());
 268     ASSERT_TRUE(parsed_json.get() != NULL);
 269
 270     const base::DictionaryValue* request_json;
 271     ASSERT_TRUE(parsed_json->GetAsDictionary(&request_json));
 272
 273     if (!is_default_url) {
 274       if (expected_access_token.empty())
 275         ASSERT_FALSE(request_json->HasKey(kAccessTokenString));
 276       else {
 277         std::string access_token;
 278         EXPECT_TRUE(request_json->GetString(kAccessTokenString, &access_token));
 279         EXPECT_EQ(expected_access_token, access_token);
 280       }
 281     }
 282
 283     if (expected_wifi_aps) {
 284       base::ListValue expected_wifi_aps_json;
 285       CreateReferenceWifiScanDataJson(
 286           expected_wifi_aps,
 287           wifi_start_index,
 288           &expected_wifi_aps_json);
 289       EXPECT_EQ(size_t(expected_wifi_aps), expected_wifi_aps_json.GetSize());
 290
 291       const base::ListValue* wifi_aps_json;
 292       ASSERT_TRUE(JsonGetList("wifiAccessPoints", *request_json,
 293                               &wifi_aps_json));
 294       for (size_t i = 0; i < expected_wifi_aps_json.GetSize(); ++i ) {
 295         const base::DictionaryValue* expected_json;
 296         ASSERT_TRUE(expected_wifi_aps_json.GetDictionary(i, &expected_json));
 297         const base::DictionaryValue* actual_json;
 298         ASSERT_TRUE(wifi_aps_json->GetDictionary(i, &actual_json));
 299         ASSERT_TRUE(JsonFieldEquals("macAddress", *expected_json,
 300                                     *actual_json));
 301         ASSERT_TRUE(JsonFieldEquals("signalStrength", *expected_json,
 302                                     *actual_json));
 303         ASSERT_TRUE(JsonFieldEquals("channel", *expected_json, *actual_json));
 304         ASSERT_TRUE(JsonFieldEquals("signalToNoiseRatio", *expected_json,
 305                                     *actual_json));
 306       }
 307     } else {
 308       ASSERT_FALSE(request_json->HasKey("wifiAccessPoints"));
 309     }
 310     EXPECT_TRUE(request_url.is_valid());
 311   }
 312
 313   GURL test_server_url_;
 314   base::MessageLoop main_message_loop_;
 315   scoped_refptr<FakeAccessTokenStore> access_token_store_;
 316   net::TestURLFetcherFactory url_fetcher_factory_;
 317   scoped_refptr<MockWifiDataProvider> wifi_data_provider_;
 318 };
 319
 320 TEST_F(GeolocationNetworkProviderTest, CreateDestroy) {
 321   // Test fixture members were SetUp correctly.
 322   EXPECT_EQ(&main_message_loop_, base::MessageLoop::current());
 323   scoped_ptr<LocationProvider> provider(CreateProvider(true));
 324   EXPECT_TRUE(NULL != provider.get());
 325   provider.reset();
 326   SUCCEED();
 327 }
 328
 329 TEST_F(GeolocationNetworkProviderTest, StartProvider) {
 330   scoped_ptr<LocationProvider> provider(CreateProvider(true));
 331   EXPECT_TRUE(provider->StartProvider(false));
 332   net::TestURLFetcher* fetcher = get_url_fetcher_and_advance_id();
 333   ASSERT_TRUE(fetcher != NULL);
 334   CheckRequestIsValid(*fetcher, 0, 0, 0, std::string());
 335 }
 336
 337 TEST_F(GeolocationNetworkProviderTest, StartProviderDefaultUrl) {
 338   test_server_url_ = LocationArbitratorImpl::DefaultNetworkProviderURL();
 339   scoped_ptr<LocationProvider> provider(CreateProvider(true));
 340   EXPECT_TRUE(provider->StartProvider(false));
 341   net::TestURLFetcher* fetcher = get_url_fetcher_and_advance_id();
 342   ASSERT_TRUE(fetcher != NULL);
 343   CheckRequestIsValid(*fetcher, 0, 0, 0, std::string());
 344 }
 345
 346 TEST_F(GeolocationNetworkProviderTest, StartProviderLongRequest) {
 347   scoped_ptr<LocationProvider> provider(CreateProvider(true));
 348   EXPECT_TRUE(provider->StartProvider(false));
 349   const int kFirstScanAps = 20;
 350   wifi_data_provider_->SetData(CreateReferenceWifiScanData(kFirstScanAps));
 351   main_message_loop_.RunUntilIdle();
 352   net::TestURLFetcher* fetcher = get_url_fetcher_and_advance_id();
 353   ASSERT_TRUE(fetcher != NULL);
 354   // The request url should have been shortened to less than 2048 characters
 355   // in length by not including access points with the lowest signal strength
 356   // in the request.
 357   EXPECT_LT(fetcher->GetOriginalURL().spec().size(), size_t(2048));
 358   CheckRequestIsValid(*fetcher, 0, 16, 4, std::string());
 359 }
 360
 361 TEST_F(GeolocationNetworkProviderTest, MultipleWifiScansComplete) {
 362   scoped_ptr<LocationProvider> provider(CreateProvider(true));
 363   EXPECT_TRUE(provider->StartProvider(false));
 364
 365   net::TestURLFetcher* fetcher = get_url_fetcher_and_advance_id();
 366   ASSERT_TRUE(fetcher != NULL);
 367   EXPECT_TRUE(IsTestServerUrl(fetcher->GetOriginalURL()));
 368
 369   // Complete the network request with bad position fix.
 370   const char* kNoFixNetworkResponse =
 371       "{"
 372       "  \"status\": \"ZERO_RESULTS\""
 373       "}";
 374   fetcher->set_url(test_server_url_);
 375   fetcher->set_status(net::URLRequestStatus());
 376   fetcher->set_response_code(200);  // OK
 377   fetcher->SetResponseString(kNoFixNetworkResponse);
 378   fetcher->delegate()->OnURLFetchComplete(fetcher);
 379
 380   Geoposition position;
 381   provider->GetPosition(&position);
 382   EXPECT_FALSE(position.Validate());
 383
 384   // Now wifi data arrives -- SetData will notify listeners.
 385   const int kFirstScanAps = 6;
 386   wifi_data_provider_->SetData(CreateReferenceWifiScanData(kFirstScanAps));
 387   main_message_loop_.RunUntilIdle();
 388   fetcher = get_url_fetcher_and_advance_id();
 389   ASSERT_TRUE(fetcher != NULL);
 390   // The request should have the wifi data.
 391   CheckRequestIsValid(*fetcher, 0, kFirstScanAps, 0, std::string());
 392
 393   // Send a reply with good position fix.
 394   const char* kReferenceNetworkResponse =
 395       "{"
 396       "  \"accessToken\": \"" REFERENCE_ACCESS_TOKEN "\","
 397       "  \"accuracy\": 1200.4,"
 398       "  \"location\": {"
 399       "    \"lat\": 51.0,"
 400       "    \"lng\": -0.1"
 401       "  }"
 402       "}";
 403   fetcher->set_url(test_server_url_);
 404   fetcher->set_status(net::URLRequestStatus());
 405   fetcher->set_response_code(200);  // OK
 406   fetcher->SetResponseString(kReferenceNetworkResponse);
 407   fetcher->delegate()->OnURLFetchComplete(fetcher);
 408
 409   provider->GetPosition(&position);
 410   EXPECT_EQ(51.0, position.latitude);
 411   EXPECT_EQ(-0.1, position.longitude);
 412   EXPECT_EQ(1200.4, position.accuracy);
 413   EXPECT_FALSE(position.timestamp.is_null());
 414   EXPECT_TRUE(position.Validate());
 415
 416   // Token should be in the store.
 417   EXPECT_EQ(base::UTF8ToUTF16(REFERENCE_ACCESS_TOKEN),
 418             access_token_store_->access_token_set_[test_server_url_]);
 419
 420   // Wifi updated again, with one less AP. This is 'close enough' to the
 421   // previous scan, so no new request made.
 422   const int kSecondScanAps = kFirstScanAps - 1;
 423   wifi_data_provider_->SetData(CreateReferenceWifiScanData(kSecondScanAps));
 424   main_message_loop_.RunUntilIdle();
 425   fetcher = get_url_fetcher_and_advance_id();
 426   EXPECT_FALSE(fetcher);
 427
 428   provider->GetPosition(&position);
 429   EXPECT_EQ(51.0, position.latitude);
 430   EXPECT_EQ(-0.1, position.longitude);
 431   EXPECT_TRUE(position.Validate());
 432
 433   // Now a third scan with more than twice the original amount -> new request.
 434   const int kThirdScanAps = kFirstScanAps * 2 + 1;
 435   wifi_data_provider_->SetData(CreateReferenceWifiScanData(kThirdScanAps));
 436   main_message_loop_.RunUntilIdle();
 437   fetcher = get_url_fetcher_and_advance_id();
 438   EXPECT_TRUE(fetcher);
 439   CheckRequestIsValid(*fetcher, 0, kThirdScanAps, 0, REFERENCE_ACCESS_TOKEN);
 440   // ...reply with a network error.
 441
 442   fetcher->set_url(test_server_url_);
 443   fetcher->set_status(net::URLRequestStatus(net::URLRequestStatus::FAILED, -1));
 444   fetcher->set_response_code(200);  // should be ignored
 445   fetcher->SetResponseString(std::string());
 446   fetcher->delegate()->OnURLFetchComplete(fetcher);
 447
 448   // Error means we now no longer have a fix.
 449   provider->GetPosition(&position);
 450   EXPECT_FALSE(position.Validate());
 451
 452   // Wifi scan returns to original set: should be serviced from cache.
 453   wifi_data_provider_->SetData(CreateReferenceWifiScanData(kFirstScanAps));
 454   main_message_loop_.RunUntilIdle();
 455   EXPECT_FALSE(get_url_fetcher_and_advance_id());  // No new request created.
 456
 457   provider->GetPosition(&position);
 458   EXPECT_EQ(51.0, position.latitude);
 459   EXPECT_EQ(-0.1, position.longitude);
 460   EXPECT_TRUE(position.Validate());
 461 }
 462
 463 TEST_F(GeolocationNetworkProviderTest, NoRequestOnStartupUntilWifiData) {
 464   MessageLoopQuitListener listener;
 465   wifi_data_provider_->set_got_data(false);
 466   scoped_ptr<LocationProvider> provider(CreateProvider(true));
 467   EXPECT_TRUE(provider->StartProvider(false));
 468
 469   provider->SetUpdateCallback(base::Bind(
 470       &MessageLoopQuitListener::OnLocationUpdate, base::Unretained(&listener)));
 471
 472   main_message_loop_.RunUntilIdle();
 473   EXPECT_FALSE(get_url_fetcher_and_advance_id())
 474       << "Network request should not be created right away on startup when "
 475          "wifi data has not yet arrived";
 476
 477   wifi_data_provider_->SetData(CreateReferenceWifiScanData(1));
 478   main_message_loop_.RunUntilIdle();
 479   EXPECT_TRUE(get_url_fetcher_and_advance_id());
 480 }
 481
 482 TEST_F(GeolocationNetworkProviderTest, NewDataReplacesExistingNetworkRequest) {
 483   // Send initial request with empty data
 484   scoped_ptr<LocationProvider> provider(CreateProvider(true));
 485   EXPECT_TRUE(provider->StartProvider(false));
 486   net::TestURLFetcher* fetcher = get_url_fetcher_and_advance_id();
 487   EXPECT_TRUE(fetcher);
 488
 489   // Now wifi data arrives; new request should be sent.
 490   wifi_data_provider_->SetData(CreateReferenceWifiScanData(4));
 491   main_message_loop_.RunUntilIdle();
 492   fetcher = get_url_fetcher_and_advance_id();
 493   EXPECT_TRUE(fetcher);
 494 }
 495
 496 TEST_F(GeolocationNetworkProviderTest, NetworkRequestDeferredForPermission) {
 497   scoped_ptr<LocationProvider> provider(CreateProvider(false));
 498   EXPECT_TRUE(provider->StartProvider(false));
 499   net::TestURLFetcher* fetcher = get_url_fetcher_and_advance_id();
 500   EXPECT_FALSE(fetcher);
 501   provider->OnPermissionGranted();
 502
 503   fetcher = get_url_fetcher_and_advance_id();
 504   ASSERT_TRUE(fetcher != NULL);
 505
 506   EXPECT_TRUE(IsTestServerUrl(fetcher->GetOriginalURL()));
 507 }
 508
 509 TEST_F(GeolocationNetworkProviderTest,
 510        NetworkRequestWithWifiDataDeferredForPermission) {
 511   access_token_store_->access_token_set_[test_server_url_] =
 512       base::UTF8ToUTF16(REFERENCE_ACCESS_TOKEN);
 513   scoped_ptr<LocationProvider> provider(CreateProvider(false));
 514   EXPECT_TRUE(provider->StartProvider(false));
 515   net::TestURLFetcher* fetcher = get_url_fetcher_and_advance_id();
 516   EXPECT_FALSE(fetcher);
 517
 518   static const int kScanCount = 4;
 519   wifi_data_provider_->SetData(CreateReferenceWifiScanData(kScanCount));
 520   main_message_loop_.RunUntilIdle();
 521
 522   fetcher = get_url_fetcher_and_advance_id();
 523   EXPECT_FALSE(fetcher);
 524
 525   provider->OnPermissionGranted();
 526
 527   fetcher = get_url_fetcher_and_advance_id();
 528   ASSERT_TRUE(fetcher != NULL);
 529
 530   CheckRequestIsValid(*fetcher, 0, kScanCount, 0, REFERENCE_ACCESS_TOKEN);
 531 }
 532
 533 TEST_F(GeolocationNetworkProviderTest, NetworkPositionCache) {
 534   NetworkLocationProvider::PositionCache cache;
 535
 536   const int kCacheSize = NetworkLocationProvider::PositionCache::kMaximumSize;
 537   for (int i = 1; i < kCacheSize * 2 + 1; ++i) {
 538     Geoposition pos = CreateReferencePosition(i);
 539     bool ret = cache.CachePosition(CreateReferenceWifiScanData(i), pos);
 540     EXPECT_TRUE(ret)  << i;
 541     const Geoposition* item =
 542         cache.FindPosition(CreateReferenceWifiScanData(i));
 543     ASSERT_TRUE(item) << i;
 544     EXPECT_EQ(pos.latitude, item->latitude)  << i;
 545     EXPECT_EQ(pos.longitude, item->longitude)  << i;
 546     if (i <= kCacheSize) {
 547       // Nothing should have spilled yet; check oldest item is still there.
 548       EXPECT_TRUE(cache.FindPosition(CreateReferenceWifiScanData(1)));
 549     } else {
 550       const int evicted = i - kCacheSize;
 551       EXPECT_FALSE(cache.FindPosition(CreateReferenceWifiScanData(evicted)));
 552       EXPECT_TRUE(cache.FindPosition(CreateReferenceWifiScanData(evicted + 1)));
 553     }
 554   }
 555 }
 556
 557 }  // namespace content