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::DeprecatedReadAndReturnError(
 263             upload_data, base::JSON_PARSE_RFC, NULL, &json_parse_error_msg));
 264     EXPECT_TRUE(json_parse_error_msg.empty());
 265     ASSERT_TRUE(parsed_json.get() != NULL);
 266
 267     const base::DictionaryValue* request_json;
 268     ASSERT_TRUE(parsed_json->GetAsDictionary(&request_json));
 269
 270     if (!is_default_url) {
 271       if (expected_access_token.empty())
 272         ASSERT_FALSE(request_json->HasKey(kAccessTokenString));
 273       else {
 274         std::string access_token;
 275         EXPECT_TRUE(request_json->GetString(kAccessTokenString, &access_token));
 276         EXPECT_EQ(expected_access_token, access_token);
 277       }
 278     }
 279
 280     if (expected_wifi_aps) {
 281       base::ListValue expected_wifi_aps_json;
 282       CreateReferenceWifiScanDataJson(
 283           expected_wifi_aps,
 284           wifi_start_index,
 285           &expected_wifi_aps_json);
 286       EXPECT_EQ(size_t(expected_wifi_aps), expected_wifi_aps_json.GetSize());
 287
 288       const base::ListValue* wifi_aps_json;
 289       ASSERT_TRUE(JsonGetList("wifiAccessPoints", *request_json,
 290                               &wifi_aps_json));
 291       for (size_t i = 0; i < expected_wifi_aps_json.GetSize(); ++i ) {
 292         const base::DictionaryValue* expected_json;
 293         ASSERT_TRUE(expected_wifi_aps_json.GetDictionary(i, &expected_json));
 294         const base::DictionaryValue* actual_json;
 295         ASSERT_TRUE(wifi_aps_json->GetDictionary(i, &actual_json));
 296         ASSERT_TRUE(JsonFieldEquals("macAddress", *expected_json,
 297                                     *actual_json));
 298         ASSERT_TRUE(JsonFieldEquals("signalStrength", *expected_json,
 299                                     *actual_json));
 300         ASSERT_TRUE(JsonFieldEquals("channel", *expected_json, *actual_json));
 301         ASSERT_TRUE(JsonFieldEquals("signalToNoiseRatio", *expected_json,
 302                                     *actual_json));
 303       }
 304     } else {
 305       ASSERT_FALSE(request_json->HasKey("wifiAccessPoints"));
 306     }
 307     EXPECT_TRUE(request_url.is_valid());
 308   }
 309
 310   GURL test_server_url_;
 311   base::MessageLoop main_message_loop_;
 312   scoped_refptr<FakeAccessTokenStore> access_token_store_;
 313   net::TestURLFetcherFactory url_fetcher_factory_;
 314   scoped_refptr<MockWifiDataProvider> wifi_data_provider_;
 315 };
 316
 317 TEST_F(GeolocationNetworkProviderTest, CreateDestroy) {
 318   // Test fixture members were SetUp correctly.
 319   EXPECT_EQ(&main_message_loop_, base::MessageLoop::current());
 320   scoped_ptr<LocationProvider> provider(CreateProvider(true));
 321   EXPECT_TRUE(NULL != provider.get());
 322   provider.reset();
 323   SUCCEED();
 324 }
 325
 326 TEST_F(GeolocationNetworkProviderTest, StartProvider) {
 327   scoped_ptr<LocationProvider> provider(CreateProvider(true));
 328   EXPECT_TRUE(provider->StartProvider(false));
 329   net::TestURLFetcher* fetcher = get_url_fetcher_and_advance_id();
 330   ASSERT_TRUE(fetcher != NULL);
 331   CheckRequestIsValid(*fetcher, 0, 0, 0, std::string());
 332 }
 333
 334 TEST_F(GeolocationNetworkProviderTest, StartProviderDefaultUrl) {
 335   test_server_url_ = LocationArbitratorImpl::DefaultNetworkProviderURL();
 336   scoped_ptr<LocationProvider> provider(CreateProvider(true));
 337   EXPECT_TRUE(provider->StartProvider(false));
 338   net::TestURLFetcher* fetcher = get_url_fetcher_and_advance_id();
 339   ASSERT_TRUE(fetcher != NULL);
 340   CheckRequestIsValid(*fetcher, 0, 0, 0, std::string());
 341 }
 342
 343 TEST_F(GeolocationNetworkProviderTest, StartProviderLongRequest) {
 344   scoped_ptr<LocationProvider> provider(CreateProvider(true));
 345   EXPECT_TRUE(provider->StartProvider(false));
 346   const int kFirstScanAps = 20;
 347   wifi_data_provider_->SetData(CreateReferenceWifiScanData(kFirstScanAps));
 348   main_message_loop_.RunUntilIdle();
 349   net::TestURLFetcher* fetcher = get_url_fetcher_and_advance_id();
 350   ASSERT_TRUE(fetcher != NULL);
 351   // The request url should have been shortened to less than 2048 characters
 352   // in length by not including access points with the lowest signal strength
 353   // in the request.
 354   EXPECT_LT(fetcher->GetOriginalURL().spec().size(), size_t(2048));
 355   CheckRequestIsValid(*fetcher, 0, 16, 4, std::string());
 356 }
 357
 358 TEST_F(GeolocationNetworkProviderTest, MultipleWifiScansComplete) {
 359   scoped_ptr<LocationProvider> provider(CreateProvider(true));
 360   EXPECT_TRUE(provider->StartProvider(false));
 361
 362   net::TestURLFetcher* fetcher = get_url_fetcher_and_advance_id();
 363   ASSERT_TRUE(fetcher != NULL);
 364   EXPECT_TRUE(IsTestServerUrl(fetcher->GetOriginalURL()));
 365
 366   // Complete the network request with bad position fix.
 367   const char* kNoFixNetworkResponse =
 368       "{"
 369       "  \"status\": \"ZERO_RESULTS\""
 370       "}";
 371   fetcher->set_url(test_server_url_);
 372   fetcher->set_status(net::URLRequestStatus());
 373   fetcher->set_response_code(200);  // OK
 374   fetcher->SetResponseString(kNoFixNetworkResponse);
 375   fetcher->delegate()->OnURLFetchComplete(fetcher);
 376
 377   Geoposition position;
 378   provider->GetPosition(&position);
 379   EXPECT_FALSE(position.Validate());
 380
 381   // Now wifi data arrives -- SetData will notify listeners.
 382   const int kFirstScanAps = 6;
 383   wifi_data_provider_->SetData(CreateReferenceWifiScanData(kFirstScanAps));
 384   main_message_loop_.RunUntilIdle();
 385   fetcher = get_url_fetcher_and_advance_id();
 386   ASSERT_TRUE(fetcher != NULL);
 387   // The request should have the wifi data.
 388   CheckRequestIsValid(*fetcher, 0, kFirstScanAps, 0, std::string());
 389
 390   // Send a reply with good position fix.
 391   const char* kReferenceNetworkResponse =
 392       "{"
 393       "  \"accessToken\": \"" REFERENCE_ACCESS_TOKEN "\","
 394       "  \"accuracy\": 1200.4,"
 395       "  \"location\": {"
 396       "    \"lat\": 51.0,"
 397       "    \"lng\": -0.1"
 398       "  }"
 399       "}";
 400   fetcher->set_url(test_server_url_);
 401   fetcher->set_status(net::URLRequestStatus());
 402   fetcher->set_response_code(200);  // OK
 403   fetcher->SetResponseString(kReferenceNetworkResponse);
 404   fetcher->delegate()->OnURLFetchComplete(fetcher);
 405
 406   provider->GetPosition(&position);
 407   EXPECT_EQ(51.0, position.latitude);
 408   EXPECT_EQ(-0.1, position.longitude);
 409   EXPECT_EQ(1200.4, position.accuracy);
 410   EXPECT_FALSE(position.timestamp.is_null());
 411   EXPECT_TRUE(position.Validate());
 412
 413   // Token should be in the store.
 414   EXPECT_EQ(base::UTF8ToUTF16(REFERENCE_ACCESS_TOKEN),
 415             access_token_store_->access_token_set_[test_server_url_]);
 416
 417   // Wifi updated again, with one less AP. This is 'close enough' to the
 418   // previous scan, so no new request made.
 419   const int kSecondScanAps = kFirstScanAps - 1;
 420   wifi_data_provider_->SetData(CreateReferenceWifiScanData(kSecondScanAps));
 421   main_message_loop_.RunUntilIdle();
 422   fetcher = get_url_fetcher_and_advance_id();
 423   EXPECT_FALSE(fetcher);
 424
 425   provider->GetPosition(&position);
 426   EXPECT_EQ(51.0, position.latitude);
 427   EXPECT_EQ(-0.1, position.longitude);
 428   EXPECT_TRUE(position.Validate());
 429
 430   // Now a third scan with more than twice the original amount -> new request.
 431   const int kThirdScanAps = kFirstScanAps * 2 + 1;
 432   wifi_data_provider_->SetData(CreateReferenceWifiScanData(kThirdScanAps));
 433   main_message_loop_.RunUntilIdle();
 434   fetcher = get_url_fetcher_and_advance_id();
 435   EXPECT_TRUE(fetcher);
 436   CheckRequestIsValid(*fetcher, 0, kThirdScanAps, 0, REFERENCE_ACCESS_TOKEN);
 437   // ...reply with a network error.
 438
 439   fetcher->set_url(test_server_url_);
 440   fetcher->set_status(net::URLRequestStatus(net::URLRequestStatus::FAILED, -1));
 441   fetcher->set_response_code(200);  // should be ignored
 442   fetcher->SetResponseString(std::string());
 443   fetcher->delegate()->OnURLFetchComplete(fetcher);
 444
 445   // Error means we now no longer have a fix.
 446   provider->GetPosition(&position);
 447   EXPECT_FALSE(position.Validate());
 448
 449   // Wifi scan returns to original set: should be serviced from cache.
 450   wifi_data_provider_->SetData(CreateReferenceWifiScanData(kFirstScanAps));
 451   main_message_loop_.RunUntilIdle();
 452   EXPECT_FALSE(get_url_fetcher_and_advance_id());  // No new request created.
 453
 454   provider->GetPosition(&position);
 455   EXPECT_EQ(51.0, position.latitude);
 456   EXPECT_EQ(-0.1, position.longitude);
 457   EXPECT_TRUE(position.Validate());
 458 }
 459
 460 TEST_F(GeolocationNetworkProviderTest, NoRequestOnStartupUntilWifiData) {
 461   MessageLoopQuitListener listener;
 462   wifi_data_provider_->set_got_data(false);
 463   scoped_ptr<LocationProvider> provider(CreateProvider(true));
 464   EXPECT_TRUE(provider->StartProvider(false));
 465
 466   provider->SetUpdateCallback(base::Bind(
 467       &MessageLoopQuitListener::OnLocationUpdate, base::Unretained(&listener)));
 468
 469   main_message_loop_.RunUntilIdle();
 470   EXPECT_FALSE(get_url_fetcher_and_advance_id())
 471       << "Network request should not be created right away on startup when "
 472          "wifi data has not yet arrived";
 473
 474   wifi_data_provider_->SetData(CreateReferenceWifiScanData(1));
 475   main_message_loop_.RunUntilIdle();
 476   EXPECT_TRUE(get_url_fetcher_and_advance_id());
 477 }
 478
 479 TEST_F(GeolocationNetworkProviderTest, NewDataReplacesExistingNetworkRequest) {
 480   // Send initial request with empty data
 481   scoped_ptr<LocationProvider> provider(CreateProvider(true));
 482   EXPECT_TRUE(provider->StartProvider(false));
 483   net::TestURLFetcher* fetcher = get_url_fetcher_and_advance_id();
 484   EXPECT_TRUE(fetcher);
 485
 486   // Now wifi data arrives; new request should be sent.
 487   wifi_data_provider_->SetData(CreateReferenceWifiScanData(4));
 488   main_message_loop_.RunUntilIdle();
 489   fetcher = get_url_fetcher_and_advance_id();
 490   EXPECT_TRUE(fetcher);
 491 }
 492
 493 TEST_F(GeolocationNetworkProviderTest, NetworkRequestDeferredForPermission) {
 494   scoped_ptr<LocationProvider> provider(CreateProvider(false));
 495   EXPECT_TRUE(provider->StartProvider(false));
 496   net::TestURLFetcher* fetcher = get_url_fetcher_and_advance_id();
 497   EXPECT_FALSE(fetcher);
 498   provider->OnPermissionGranted();
 499
 500   fetcher = get_url_fetcher_and_advance_id();
 501   ASSERT_TRUE(fetcher != NULL);
 502
 503   EXPECT_TRUE(IsTestServerUrl(fetcher->GetOriginalURL()));
 504 }
 505
 506 TEST_F(GeolocationNetworkProviderTest,
 507        NetworkRequestWithWifiDataDeferredForPermission) {
 508   access_token_store_->access_token_set_[test_server_url_] =
 509       base::UTF8ToUTF16(REFERENCE_ACCESS_TOKEN);
 510   scoped_ptr<LocationProvider> provider(CreateProvider(false));
 511   EXPECT_TRUE(provider->StartProvider(false));
 512   net::TestURLFetcher* fetcher = get_url_fetcher_and_advance_id();
 513   EXPECT_FALSE(fetcher);
 514
 515   static const int kScanCount = 4;
 516   wifi_data_provider_->SetData(CreateReferenceWifiScanData(kScanCount));
 517   main_message_loop_.RunUntilIdle();
 518
 519   fetcher = get_url_fetcher_and_advance_id();
 520   EXPECT_FALSE(fetcher);
 521
 522   provider->OnPermissionGranted();
 523
 524   fetcher = get_url_fetcher_and_advance_id();
 525   ASSERT_TRUE(fetcher != NULL);
 526
 527   CheckRequestIsValid(*fetcher, 0, kScanCount, 0, REFERENCE_ACCESS_TOKEN);
 528 }
 529
 530 TEST_F(GeolocationNetworkProviderTest, NetworkPositionCache) {
 531   NetworkLocationProvider::PositionCache cache;
 532
 533   const int kCacheSize = NetworkLocationProvider::PositionCache::kMaximumSize;
 534   for (int i = 1; i < kCacheSize * 2 + 1; ++i) {
 535     Geoposition pos = CreateReferencePosition(i);
 536     bool ret = cache.CachePosition(CreateReferenceWifiScanData(i), pos);
 537     EXPECT_TRUE(ret)  << i;
 538     const Geoposition* item =
 539         cache.FindPosition(CreateReferenceWifiScanData(i));
 540     ASSERT_TRUE(item) << i;
 541     EXPECT_EQ(pos.latitude, item->latitude)  << i;
 542     EXPECT_EQ(pos.longitude, item->longitude)  << i;
 543     if (i <= kCacheSize) {
 544       // Nothing should have spilled yet; check oldest item is still there.
 545       EXPECT_TRUE(cache.FindPosition(CreateReferenceWifiScanData(1)));
 546     } else {
 547       const int evicted = i - kCacheSize;
 548       EXPECT_FALSE(cache.FindPosition(CreateReferenceWifiScanData(evicted)));
 549       EXPECT_TRUE(cache.FindPosition(CreateReferenceWifiScanData(evicted + 1)));
 550     }
 551   }
 552 }
 553
 554 }  // namespace content