Add InterestsFetcher which retrieves a user's interests from the server.

chrome/browser/interests/interests_fetcher_unittest.cc

+// Copyright 2015 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 "chrome/browser/interests/interests_fetcher.h"
+
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "base/command_line.h"
+#include "base/memory/ref_counted.h"
+#include "base/message_loop/message_loop.h"
+#include "base/thread_task_runner_handle.h"
+#include "chrome/common/chrome_switches.h"
+#include "components/signin/core/browser/fake_profile_oauth2_token_service.h"
+#include "net/base/net_errors.h"
+#include "net/http/http_status_code.h"
+#include "net/url_request/test_url_fetcher_factory.h"
+#include "net/url_request/url_request_status.h"
+#include "net/url_request/url_request_test_util.h"
+#include "testing/gmock/include/gmock/gmock-generated-function-mockers.h"
+#include "testing/gmock/include/gmock/gmock-matchers.h"
+#include "testing/gmock/include/gmock/gmock-more-matchers.h"
+#include "testing/gmock/include/gmock/gmock-spec-builders.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+using testing::IsEmpty;
+using testing::Not;
+
+namespace {

[Bernhard Bauer, 2015/10/06 08:56:10]

Nit: empty line afterwards.

[PEConn, 2015/10/06 10:11:45]

Done.

+const int kInterestsFetcherURLFetcherID = 0;
+const char kInterestsURL[] = "http://www.fake.com";
+const char kEmptyResponse[] = "{\n"
+      "\"interests\": []\n"

[Bernhard Bauer, 2015/10/06 08:56:10]

Alignment. Also, I would break immediately after the equals sign, so all the
lines are aligned.

[PEConn, 2015/10/06 10:11:45]

Done.

+    "}\n";
+const char kSuccessfulResponse[] = "{\n"
+    "  \"interests\": [\n"
+    "    {\n"
+    "      \"name\": \"Google\",\n"
+    "      \"imageUrl\": \"https://fake.com/fake.png\",\n"
+    "      \"relevance\": 0.9\n"
+    "    },\n"
+    "    {\n"
+    "      \"name\": \"Google Chrome\",\n"
+    "      \"imageUrl\": \"https://fake.com/fake.png\",\n"
+    "      \"relevance\": 0.98\n"
+    "    }\n"
+    "  ]\n"
+    "}\n";
+const char kAccountId[] = "account@gmail.com";
+
+std::vector<InterestsFetcher::Interest> GetExpectedEmptyResponse() {
+  return std::vector<InterestsFetcher::Interest>();
+}
+
+std::vector<InterestsFetcher::Interest> GetExpectedSuccessfulResponse() {
+  std::vector<InterestsFetcher::Interest> res;
+  res.push_back(
+      InterestsFetcher::Interest{"Google", GURL("https://fake.com/fake.png"), 0.9});

[Bernhard Bauer, 2015/10/06 08:56:10]

This appears to be over 80 columns.

[PEConn, 2015/10/06 10:11:45]

Done.

+  res.push_back(InterestsFetcher::Interest{
+      "Google Chrome", GURL("https://fake.com/fake.png"), 0.98});
+  return res;
+}
+}  // namespace
+
+class InterestsFetcherTest : public testing::Test {
+ public:
+  InterestsFetcherTest()
+      : request_context_(new net::TestURLRequestContextGetter(
+            base::ThreadTaskRunnerHandle::Get())),
+        url_fetcher_factory_(new net::TestURLFetcherFactory()) {
+    token_service_.UpdateCredentials(kAccountId, "refresh_token");
+
+    base::CommandLine* command_line =
+        base::CommandLine::ForCurrentProcess();
+
+    command_line->AppendSwitchASCII(switches::kInterestsURL, kInterestsURL);
+  }
+
+  MOCK_METHOD1(OnReceivedInterests,
+               void(const std::vector<InterestsFetcher::Interest>&));
+ protected:

[Marc Treib, 2015/10/06 09:35:47]

nit: Empty line before protected.

[PEConn, 2015/10/06 10:11:45]

Done.

+  void RequestInterests() {
+    request_.reset(new InterestsFetcher(
+        &token_service_,
+        kAccountId,
+        request_context_.get()));
+
+    request_->FetchInterests(
+        base::Bind(&InterestsFetcherTest::OnReceivedInterests,
+                   base::Unretained(this)));
+  }
+
+  net::TestURLFetcher* GetURLFetcher() {
+    net::TestURLFetcher* url_fetcher = url_fetcher_factory_->GetFetcherByID(
+        kInterestsFetcherURLFetcherID);
+    EXPECT_TRUE(url_fetcher);
+    return url_fetcher;
+  }
+
+  void IssueAccessTokenErrors() {
+     token_service_.IssueErrorForAllPendingRequestsForAccount(
+         kAccountId,
+         GoogleServiceAuthError::FromServiceError("Error!"));
+  }
+
+  void IssueAccessTokens() {
+    token_service_.IssueAllTokensForAccount(
+        kAccountId,
+        "access_token",
+        base::Time::Now() + base::TimeDelta::FromHours(1));
+  }
+
+  void SendResponse(net::Error error, int response_code,
+                    const std::string& response) {
+    net::TestURLFetcher* url_fetcher = GetURLFetcher();
+    url_fetcher->set_status(net::URLRequestStatus::FromError(error));
+    url_fetcher->set_response_code(response_code);
+    url_fetcher->SetResponseString(response);
+    url_fetcher->delegate()->OnURLFetchComplete(url_fetcher);
+  }
+
+  void SendValidResponse(const std::string& response) {
+    SendResponse(net::OK, net::HTTP_OK, response);
+  }
+
+  void SendFailedResponse() {
+    SendResponse(net::ERR_ABORTED, 0, std::string());
+  }
+
+  void SendAuthorizationError() {
+    SendResponse(net::OK, net::HTTP_UNAUTHORIZED, std::string());
+  }
+
+  base::MessageLoop message_loop_;
+  FakeProfileOAuth2TokenService token_service_;
+  scoped_refptr<net::TestURLRequestContextGetter> request_context_;
+  scoped_ptr<net::TestURLFetcherFactory> url_fetcher_factory_;
+  scoped_ptr<InterestsFetcher> request_;
+};
+
+TEST_F(InterestsFetcherTest, EmptyResponse) {
+  RequestInterests();
+  EXPECT_CALL(*this, OnReceivedInterests(GetExpectedEmptyResponse()));
+  IssueAccessTokens();
+  SendValidResponse(kEmptyResponse);
+}
+
+TEST_F(InterestsFetcherTest, SuccessfullResponse) {
+  RequestInterests();
+  EXPECT_CALL(*this, OnReceivedInterests(GetExpectedSuccessfulResponse()));
+  IssueAccessTokens();
+  SendValidResponse(kSuccessfulResponse);
+}
+
+TEST_F(InterestsFetcherTest, FailedResponse) {
+  RequestInterests();
+  EXPECT_CALL(*this, OnReceivedInterests(GetExpectedEmptyResponse()));
+  IssueAccessTokens();
+  SendFailedResponse();
+}
+
+TEST_F(InterestsFetcherTest, FailedOAuthRequest) {
+  RequestInterests();
+  EXPECT_CALL(*this, OnReceivedInterests(GetExpectedEmptyResponse()));
+  IssueAccessTokenErrors();
+}
+
+TEST_F(InterestsFetcherTest, RetryOnAuthorizationError) {
+  RequestInterests();
+  {

[Bernhard Bauer, 2015/10/06 08:56:10]

I don' think this scope does anything, as you are not declaring any variables
inside of it. I would remove it and just separate the parts visually (empty line
should be fine).

[PEConn, 2015/10/06 10:11:45]

Done.

+    EXPECT_CALL(*this, OnReceivedInterests(GetExpectedEmptyResponse()))
+        .Times(0);
+    IssueAccessTokens();
+    SendAuthorizationError();
+  }
+  {
+    EXPECT_CALL(*this, OnReceivedInterests(GetExpectedEmptyResponse()));
+    IssueAccessTokens();
+    SendValidResponse(kEmptyResponse);
+  }
+}
+
+TEST_F(InterestsFetcherTest, RetryOnlyOnceOnAuthorizationError) {
+  RequestInterests();
+  {
+    EXPECT_CALL(*this, OnReceivedInterests(GetExpectedEmptyResponse()))
+        .Times(0);
+    IssueAccessTokens();
+    SendAuthorizationError();
+  }
+  {
+    EXPECT_CALL(*this, OnReceivedInterests(GetExpectedEmptyResponse()));
+    IssueAccessTokens();
+    SendAuthorizationError();
+  }
+}