Changed previews component to be a layered component.

components/previews/previews_io_data_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 "components/previews/previews_io_data.h"
-
-#include <memory>
-
-#include "base/memory/ptr_util.h"
-#include "base/memory/ref_counted.h"
-#include "base/message_loop/message_loop.h"
-#include "base/run_loop.h"
-#include "base/single_thread_task_runner.h"
-#include "components/previews/previews_ui_service.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-namespace previews {
-
-namespace {
-
-class TestPreviewsIOData : public PreviewsIOData {
- public:
-  TestPreviewsIOData(
-      const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner,
-      const scoped_refptr<base::SingleThreadTaskRunner>& ui_task_runner)
-      : PreviewsIOData(io_task_runner, ui_task_runner), initialized_(false) {}
-  ~TestPreviewsIOData() override {}
-
-  // Whether Initialize was called.
-  bool initialized() { return initialized_; }
-
- private:
-  // Set |initialized_| to true and use base class functionality.
-  void InitializeOnIOThread() override {
-    initialized_ = true;
-    PreviewsIOData::InitializeOnIOThread();
-  }
-
-  // Whether Initialize was called.
-  bool initialized_;
-};
-
-class PreviewsIODataTest : public testing::Test {
- public:
-  PreviewsIODataTest() {}
-
-  ~PreviewsIODataTest() override {}
-
-  void set_io_data(std::unique_ptr<TestPreviewsIOData> io_data) {
-    io_data_ = std::move(io_data);
-  }
-
-  TestPreviewsIOData* io_data() { return io_data_.get(); }
-
-  void set_ui_service(std::unique_ptr<PreviewsUIService> ui_service) {
-    ui_service_ = std::move(ui_service);
-  }
-
- protected:
-  // Run this test on a single thread.
-  base::MessageLoopForIO loop_;
-
- private:
-  std::unique_ptr<TestPreviewsIOData> io_data_;
-  std::unique_ptr<PreviewsUIService> ui_service_;
-};
-
-}  // namespace
-
-TEST_F(PreviewsIODataTest, TestInitialization) {
-  set_io_data(base::WrapUnique(
-      new TestPreviewsIOData(loop_.task_runner(), loop_.task_runner())));
-  set_ui_service(
-      base::WrapUnique(new PreviewsUIService(io_data(), loop_.task_runner())));
-  base::RunLoop().RunUntilIdle();
-  // After the outstanding posted tasks have run, |io_data_| should be fully
-  // initialized.
-  EXPECT_TRUE(io_data()->initialized());
-}
-
-}  // namespace previews