Add SimpleGeolocationTest unit test.

chrome/browser/chromeos/geolocation/simple_geolocation_unittest.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/run_loop.h"
+#include "chrome/browser/chromeos/geolocation/simple_geolocation_provider.h"
+#include "content/public/test/test_browser_thread_bundle.h"
+#include "net/http/http_response_headers.h"
+#include "net/http/http_status_code.h"
+#include "net/url_request/test_url_fetcher_factory.h"
+#include "net/url_request/url_fetcher_impl.h"
+#include "net/url_request/url_request_status.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+
+const int kRequestRetryIntervalMilliSeconds = 200;
+
+// This should be different from default to prevent SimpleGeolocationRequest
+// from modifying it.
+const char kTestGeolocationProviderUrl[] =
+    "https://localhost/geolocation/v1/geolocate?";
+
+const int kDownloadRetryIntervalMS = 100;
+
+const char kSimpleResponseBody[] =
+    "{\n"
+    "  \"location\": {\n"
+    "    \"lat\": 51.0,\n"
+    "    \"lng\": -0.1\n"
+    "  },\n"
+    "  \"accuracy\": 1200.4\n"
+    "}";
+}  // anonymous namespace
+
+namespace chromeos {
+
+// This is helper class for net::FakeURLFetcherFactory.
+class TestGeolocationAPIURLFetcherCallback {
+ public:
+  TestGeolocationAPIURLFetcherCallback(const GURL& url,
+                                       const size_t require_retries,
+                                       const std::string& response,
+                                       SimpleGeolocationProvider* provider)
+      : url_(url),
+        require_retries_(require_retries),
+        response_(response),
+        factory_(NULL),
+        provider_(provider) {}
+
+  scoped_ptr<net::FakeURLFetcher> CreateURLFetcher(
+      const GURL& url,
+      net::URLFetcherDelegate* delegate,
+      const std::string& response_data,
+      net::HttpStatusCode response_code,
+      net::URLRequestStatus::Status status) {
+    EXPECT_EQ(provider_->get_requests_for_testing().size(), 1U);
+
+    SimpleGeolocationRequest* geolocation_request =
+        provider_->get_requests_for_testing()[0];
+
+    const base::TimeDelta base_retry_interval =
+        base::TimeDelta::FromMilliseconds(kRequestRetryIntervalMilliSeconds);
+    geolocation_request->set_retry_sleep_on_server_error_for_testing(
+        base_retry_interval);
+    geolocation_request->set_retry_sleep_on_bad_response_for_testing(
+        base_retry_interval);
+
+    attempts_.push_back(base::TimeTicks::Now());
+    if (attempts_.size() > 1) {
+      const base::TimeDelta current_delay =
+          attempts_.back() - attempts_[attempts_.size() - 2];
+      EXPECT_GE(current_delay, base_retry_interval)

[Nikita (slow), 2014/05/19 15:22:13]

I don't think that this is a good idea to test this retry time interval in
unit_test. I believe PostDeleayedTask was never meant to be accurate enough for
you to test it here.

[Alexander Alekseev, 2014/05/19 15:57:23]

I've removed delay checks here.

[Nikita (slow), 2014/05/19 15:58:47]

How about setting zero delays for tests?

+          << "Retry too fast. Actual interval " << current_delay.InSecondsF()
+          << " seconds, but expected at least "
+          << base_retry_interval.InSecondsF() << " seconds.";
+    }
+    if (attempts_.size() > require_retries_) {
+      response_code = net::HTTP_OK;
+      status = net::URLRequestStatus::SUCCESS;
+      factory_->SetFakeResponse(url, response_, response_code, status);
+    }
+    scoped_ptr<net::FakeURLFetcher> fetcher(new net::FakeURLFetcher(
+        url, delegate, response_, response_code, status));
+    scoped_refptr<net::HttpResponseHeaders> download_headers =
+        new net::HttpResponseHeaders(std::string());
+    download_headers->AddHeader("Content-Type: application/json");
+    fetcher->set_response_headers(download_headers);
+    return fetcher.Pass();
+  }
+
+  void Initialize(net::FakeURLFetcherFactory* factory) {
+    factory_ = factory;
+    factory_->SetFakeResponse(url_,
+                              std::string(),
+                              net::HTTP_INTERNAL_SERVER_ERROR,
+                              net::URLRequestStatus::FAILED);
+  }
+
+  size_t num_attempts() const { return attempts_.size(); }
+
+ private:
+  const GURL url_;
+  // Respond with OK on required retry attempt.
+  const size_t require_retries_;
+  std::string response_;
+  net::FakeURLFetcherFactory* factory_;
+  std::vector<base::TimeTicks> attempts_;
+  SimpleGeolocationProvider* provider_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestGeolocationAPIURLFetcherCallback);
+};
+
+// This implements fake Google MAPS Geolocation API remote endpoint.
+// Response data is served to SimpleGeolocationProvider via
+// net::FakeURLFetcher.
+class GeolocationAPIFetcherFactory {
+ public:
+  GeolocationAPIFetcherFactory(const GURL& url,
+                               const std::string& response,
+                               const size_t require_retries,
+                               SimpleGeolocationProvider* provider) {
+    url_callback_.reset(new TestGeolocationAPIURLFetcherCallback(
+        url, require_retries, response, provider));
+    net::URLFetcherImpl::set_factory(NULL);
+    fetcher_factory_.reset(new net::FakeURLFetcherFactory(
+        NULL,
+        base::Bind(&TestGeolocationAPIURLFetcherCallback::CreateURLFetcher,
+                   base::Unretained(url_callback_.get()))));
+    url_callback_->Initialize(fetcher_factory_.get());
+  }
+
+  size_t num_attempts() const { return url_callback_->num_attempts(); }
+
+ private:
+  scoped_ptr<TestGeolocationAPIURLFetcherCallback> url_callback_;
+  scoped_ptr<net::FakeURLFetcherFactory> fetcher_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(GeolocationAPIFetcherFactory);
+};
+
+class GeolocationReceiver {
+ public:
+  GeolocationReceiver() : server_error_(false) {}
+
+  void OnRequestDone(const Geoposition& position,
+                     bool server_error,
+                     const base::TimeDelta elapsed) {
+    position_ = position;
+    server_error_ = server_error;
+    elapsed_ = elapsed;
+
+    message_loop_runner_->Quit();
+  }
+
+  void WaitUntilRequestDone() {
+    message_loop_runner_.reset(new base::RunLoop);
+    message_loop_runner_->Run();
+  }
+
+  const Geoposition& position() const { return position_; }
+  bool server_error() const { return server_error_; }
+  base::TimeDelta elapsed() const { return elapsed_; }
+
+ private:
+  Geoposition position_;
+  bool server_error_;
+  base::TimeDelta elapsed_;
+  scoped_ptr<base::RunLoop> message_loop_runner_;
+};
+
+class SimpleGeolocationTest : public testing::Test {
+ private:
+  content::TestBrowserThreadBundle thread_bundle_;
+};
+
+TEST_F(SimpleGeolocationTest, ResponseOK) {
+  SimpleGeolocationProvider provider(NULL, GURL(kTestGeolocationProviderUrl));
+
+  GeolocationAPIFetcherFactory url_factory(GURL(kTestGeolocationProviderUrl),
+                                           std::string(kSimpleResponseBody),
+                                           0 /* require_retries */,
+                                           &provider);
+
+  GeolocationReceiver receiver;
+  provider.RequestGeolocation(base::TimeDelta::FromSeconds(1),
+                              base::Bind(&GeolocationReceiver::OnRequestDone,
+                                         base::Unretained(&receiver)));
+  receiver.WaitUntilRequestDone();
+
+  EXPECT_EQ(
+      "latitude=51.000000, longitude=-0.100000, accuracy=1200.400000, "
+      "error_code=0, error_message='', status=1 (OK)",
+      receiver.position().ToString());
+  EXPECT_FALSE(receiver.server_error());
+  EXPECT_EQ(1U, url_factory.num_attempts());
+}
+
+TEST_F(SimpleGeolocationTest, ResponseOKWithRetries) {
+  SimpleGeolocationProvider provider(NULL, GURL(kTestGeolocationProviderUrl));
+
+  GeolocationAPIFetcherFactory url_factory(GURL(kTestGeolocationProviderUrl),
+                                           std::string(kSimpleResponseBody),
+                                           3 /* require_retries */,
+                                           &provider);
+
+  GeolocationReceiver receiver;
+  provider.RequestGeolocation(base::TimeDelta::FromSeconds(1),
+                              base::Bind(&GeolocationReceiver::OnRequestDone,
+                                         base::Unretained(&receiver)));
+  receiver.WaitUntilRequestDone();
+  EXPECT_EQ(
+      "latitude=51.000000, longitude=-0.100000, accuracy=1200.400000, "
+      "error_code=0, error_message='', status=1 (OK)",
+      receiver.position().ToString());
+  EXPECT_FALSE(receiver.server_error());
+  EXPECT_EQ(4U, url_factory.num_attempts());

[Nikita (slow), 2014/05/19 15:22:13]

Why there were 4 attempts in case of response was fine?

[Alexander Alekseev, 2014/05/19 15:57:23]

Because 3 retry attempts were required in line 204.

+}
+
+TEST_F(SimpleGeolocationTest, InvalidResponse) {
+  SimpleGeolocationProvider provider(NULL, GURL(kTestGeolocationProviderUrl));
+
+  GeolocationAPIFetcherFactory url_factory(GURL(kTestGeolocationProviderUrl),
+                                           "invalid JSON string",
+                                           0 /* require_retries */,
+                                           &provider);
+
+  GeolocationReceiver receiver;
+  const int timeout_seconds = 1;
+  provider.RequestGeolocation(base::TimeDelta::FromSeconds(timeout_seconds),
+                              base::Bind(&GeolocationReceiver::OnRequestDone,
+                                         base::Unretained(&receiver)));
+  receiver.WaitUntilRequestDone();
+
+  EXPECT_EQ(
+      "latitude=200.000000, longitude=200.000000, accuracy=-1.000000, "
+      "error_code=0, error_message='SimpleGeolocation provider at "
+      "'https://localhost/' : JSONReader failed: Line: 1, column: 1, "
+      "Unexpected token..', status=4 (TIMEOUT)",
+      receiver.position().ToString());
+  EXPECT_TRUE(receiver.server_error());
+  size_t expected_retries = static_cast<size_t>(
+      timeout_seconds * 1000 / kRequestRetryIntervalMilliSeconds);
+  EXPECT_LE(url_factory.num_attempts(), expected_retries + 1);
+  EXPECT_GE(url_factory.num_attempts(), expected_retries - 1);
+}
+
+}  // namespace chromeos