Refactor CryptAuth component to be more testable.

components/proximity_auth/cryptauth/cryptauth_account_token_fetcher_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 "components/proximity_auth/cryptauth/cryptauth_account_token_fetcher.h"
-
-#include <string>
-
-#include "base/bind.h"
-#include "google_apis/gaia/fake_oauth2_token_service.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-namespace proximity_auth {
-
-namespace {
-
-const char kAccountId[] = "account_id";
-const char kAccessToken[] = "access_token";
-const char kInvalidResult[] = "invalid_result";
-
-// Callback that saves the fetched access token to the first argument.
-void SaveAccessToken(std::string* out_token, const std::string& in_token) {
-  *out_token = in_token;
-}
-
-}  // namespace
-
-class ProximityAuthCryptAuthAccountTokenFetcherTest : public testing::Test {
- protected:
-  ProximityAuthCryptAuthAccountTokenFetcherTest()
-      : fetcher_(&token_service_, kAccountId) {
-    token_service_.AddAccount(kAccountId);
-  }
-
-  FakeOAuth2TokenService token_service_;
-  CryptAuthAccountTokenFetcher fetcher_;
-
-  DISALLOW_COPY_AND_ASSIGN(ProximityAuthCryptAuthAccountTokenFetcherTest);
-};
-
-TEST_F(ProximityAuthCryptAuthAccountTokenFetcherTest, FetchSuccess) {
-  std::string result;
-  fetcher_.FetchAccessToken(base::Bind(SaveAccessToken, &result));
-  token_service_.IssueAllTokensForAccount(kAccountId, kAccessToken,
-                                          base::Time::Max());
-
-  EXPECT_EQ(kAccessToken, result);
-}
-
-TEST_F(ProximityAuthCryptAuthAccountTokenFetcherTest, FetchFailure) {
-  std::string result(kInvalidResult);
-  fetcher_.FetchAccessToken(base::Bind(SaveAccessToken, &result));
-  token_service_.IssueErrorForAllPendingRequestsForAccount(
-      kAccountId,
-      GoogleServiceAuthError(GoogleServiceAuthError::SERVICE_ERROR));
-
-  EXPECT_EQ(std::string(), result);
-}
-
-TEST_F(ProximityAuthCryptAuthAccountTokenFetcherTest, FetcherReuse) {
-  std::string result1;
-  fetcher_.FetchAccessToken(base::Bind(SaveAccessToken, &result1));
-
-  {
-    std::string result2(kInvalidResult);
-    fetcher_.FetchAccessToken(base::Bind(SaveAccessToken, &result2));
-    EXPECT_EQ(std::string(), result2);
-  }
-
-  token_service_.IssueAllTokensForAccount(kAccountId, kAccessToken,
-                                          base::Time::Max());
-  EXPECT_EQ(kAccessToken, result1);
-}
-
-}  // namespace proximity_auth