Create and integrate a metrics service client into Blimp engine.

blimp/engine/app/blimp_metrics_service_client_unittest.cc

+// Copyright 2016 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 "blimp/engine/app/blimp_metrics_service_client.h"
+
+#include <list>
+#include <string>
+
+#include "base/memory/ref_counted.h"
+#include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
+#include "base/test/test_simple_task_runner.h"
+#include "base/thread_task_runner_handle.h"
+#include "components/metrics/metrics_service.h"
+#include "components/pref_registry/pref_registry_syncable.h"
+#include "components/prefs/in_memory_pref_store.h"
+#include "components/prefs/pref_service.h"
+#include "components/prefs/pref_service_factory.h"
+#include "net/url_request/url_request_context_getter.h"
+#include "net/url_request/url_request_test_util.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace blimp {
+namespace engine {
+
+namespace {
+// Shows notifications which correspond to PersistentPrefStore's reading errors.
+void HandleReadError(PersistentPrefStore::PrefReadError error) {
+}
+}  // namespace
+
+class BlimpMetricsServiceClientTest : public testing::Test {
+ public:
+  BlimpMetricsServiceClientTest() {}
+
+ protected:
+  void SetUp() override {
+    // Set up PrefRegistry
+    pref_registry_ = new user_prefs::PrefRegistrySyncable();
+    metrics::MetricsService::RegisterPrefs(pref_registry_.get());
+
+    // Set up PrefService
+    PrefServiceFactory pref_service_factory;
+    pref_service_factory.set_user_prefs(new InMemoryPrefStore());
+    pref_service_factory.set_read_error_callback(base::Bind(&HandleReadError));
+    pref_service_ = pref_service_factory.Create(pref_registry_.get());
+    ASSERT_NE(nullptr, pref_service_.get());
+
+    // Set up RequestContextGetter
+    request_context_getter_ = new net::TestURLRequestContextGetter(
+        base::ThreadTaskRunnerHandle::Get());
+
+    // Set task runner global for MetricsService
+    base::SetRecordActionTaskRunner(message_loop_.task_runner());
+
+    // Set up BlimpMetricsServiceClient
+    client_.reset(new BlimpMetricsServiceClient(pref_service_.get(),
+                                              request_context_getter_));
+    base::RunLoop().RunUntilIdle();
+
+    // Checks of InitializeBlimpMetrics.
+    // TODO(jessicag): Check request_context_getter_ set.
+    // PrefService unique pointer set up by BlimpMetricsServiceClient.
+    EXPECT_EQ(PrefService::INITIALIZATION_STATUS_SUCCESS,
+              pref_service_->GetInitializationStatus());
+
+    // TODO(jessicag): Confirm registration of metrics providers.
+    // TODO(jessicag): MetricsService initializes recording state.
+    // TODO(jessicag): Confirm MetricsService::Start() is called.
+  }
+
+  void TearDown() override {
+    // Trigger BlimpMetricsServiceClientTest destructor.
+    client_.reset();
+    ASSERT_EQ(nullptr, client_.get());
+    base::RunLoop().RunUntilIdle();
+
+    // PrefService unaffected
+    EXPECT_EQ(PrefService::INITIALIZATION_STATUS_SUCCESS,
+              pref_service_->GetInitializationStatus());
+
+    // Clean up static variable in MetricService to avoid impacting other tests.
+    metrics::MetricsService::SetExecutionPhase(
+        metrics::MetricsService::UNINITIALIZED_PHASE,
+        pref_service_.get());
+  }
+
+ private:
+  base::MessageLoop message_loop_;
+  scoped_refptr<user_prefs::PrefRegistrySyncable> pref_registry_;
+  std::unique_ptr<PrefService> pref_service_;
+  scoped_refptr<net::URLRequestContextGetter> request_context_getter_;
+  std::unique_ptr<BlimpMetricsServiceClient> client_;
+
+  DISALLOW_COPY_AND_ASSIGN(BlimpMetricsServiceClientTest);
+};
+
+TEST_F(BlimpMetricsServiceClientTest, CtorDtor) {
+  // Confirm construction and destruction work as expected.
+}
+
+}  // namespace engine
+}  // namespace blimp