[Offline pages] Adding ArchiveManager to abstract offline archives management

components/offline_pages/archive_manager_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 "components/offline_pages/archive_manager.h"
+
+#include <memory>
+
+#include "base/bind.h"
+#include "base/files/file_path.h"
+#include "base/files/file_util.h"
+#include "base/files/scoped_temp_dir.h"
+#include "base/test/test_simple_task_runner.h"
+#include "base/threading/thread_task_runner_handle.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace offline_pages {
+enum class CallbackStatus {
+  NOT_CALLED,
+  CALLED_FALSE,
+  CALLED_TRUE,
+};
+
+class ArchiveManagerTest : public testing::Test {
+ public:
+  ArchiveManagerTest();
+  void SetUp() override;
+
+  void PumpLoop();
+  void ResetResults();
+
+  void ResetManager(const base::FilePath& file_path);
+  void Callback(bool result);
+
+  ArchiveManager* manager() { return manager_.get(); }
+  const base::FilePath& temp_path() const { return temp_dir_.path(); }
+  CallbackStatus callback_status() const { return callback_status_; }
+
+ private:
+  scoped_refptr<base::TestSimpleTaskRunner> task_runner_;
+  base::ThreadTaskRunnerHandle task_runner_handle_;
+  base::ScopedTempDir temp_dir_;
+
+  std::unique_ptr<ArchiveManager> manager_;
+  CallbackStatus callback_status_;
+};
+
+ArchiveManagerTest::ArchiveManagerTest()
+    : task_runner_(new base::TestSimpleTaskRunner),
+      task_runner_handle_(task_runner_),
+      callback_status_(CallbackStatus::NOT_CALLED) {}
+
+void ArchiveManagerTest::SetUp() {
+  ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
+  ResetManager(temp_dir_.path());
+}
+
+void ArchiveManagerTest::PumpLoop() {
+  task_runner_->RunUntilIdle();
+}
+
+void ArchiveManagerTest::ResetResults() {
+  callback_status_ = CallbackStatus::NOT_CALLED;
+}
+
+void ArchiveManagerTest::ResetManager(const base::FilePath& file_path) {
+  manager_.reset(
+      new ArchiveManager(file_path, base::ThreadTaskRunnerHandle::Get()));
+}
+
+void ArchiveManagerTest::Callback(bool result) {
+  callback_status_ =
+      result ? CallbackStatus::CALLED_TRUE : CallbackStatus::CALLED_FALSE;
+}
+
+TEST_F(ArchiveManagerTest, EnsureArchivesDirCreated) {
+  base::FilePath archive_dir =
+      temp_path().Append(FILE_PATH_LITERAL("test_path"));
+  ResetManager(archive_dir);
+  EXPECT_FALSE(base::PathExists(archive_dir));
+
+  // Ensure archives dir exists, when it doesn't.
+  manager()->EnsureArchivesDirCreated(
+      base::Bind(&ArchiveManagerTest::Callback, base::Unretained(this), true));
+  PumpLoop();
+  EXPECT_EQ(CallbackStatus::CALLED_TRUE, callback_status());
+  EXPECT_TRUE(base::PathExists(archive_dir));
+
+  // Try again when the file already exists.
+  ResetResults();
+  manager()->EnsureArchivesDirCreated(
+      base::Bind(&ArchiveManagerTest::Callback, base::Unretained(this), true));
+  PumpLoop();
+  EXPECT_EQ(CallbackStatus::CALLED_TRUE, callback_status());
+  EXPECT_TRUE(base::PathExists(archive_dir));
+}
+
+TEST_F(ArchiveManagerTest, ArchiveExists) {
+  base::FilePath archive_path =
+      temp_path().Append(FILE_PATH_LITERAL("missing_file.mhtml"));
+  manager()->ArchiveExists(
+      archive_path,
+      base::Bind(&ArchiveManagerTest::Callback, base::Unretained(this)));
+  PumpLoop();
+  EXPECT_EQ(CallbackStatus::CALLED_FALSE, callback_status());
+
+  ResetResults();
+  EXPECT_TRUE(base::CreateTemporaryFileInDir(temp_path(), &archive_path));
+
+  manager()->ArchiveExists(
+      archive_path,
+      base::Bind(&ArchiveManagerTest::Callback, base::Unretained(this)));
+  PumpLoop();
+  EXPECT_EQ(CallbackStatus::CALLED_TRUE, callback_status());
+}
+
+TEST_F(ArchiveManagerTest, DeleteArchives) {

[jianli, 2016/05/13 23:50:49]

Please also test the cases
1) All the archive files do not exist.
2) Some archive files do not exist.

[fgorski, 2016/05/16 17:46:52]

Done.

+  base::FilePath archive_path_1;
+  EXPECT_TRUE(base::CreateTemporaryFileInDir(temp_path(), &archive_path_1));
+  base::FilePath archive_path_2;
+  EXPECT_TRUE(base::CreateTemporaryFileInDir(temp_path(), &archive_path_2));
+  base::FilePath archive_path_3;
+  EXPECT_TRUE(base::CreateTemporaryFileInDir(temp_path(), &archive_path_3));
+
+  std::vector<base::FilePath> archive_paths = {archive_path_1, archive_path_2};
+
+  manager()->DeleteArchives(
+      archive_paths,
+      base::Bind(&ArchiveManagerTest::Callback, base::Unretained(this)));
+  PumpLoop();
+  EXPECT_EQ(CallbackStatus::CALLED_TRUE, callback_status());
+  EXPECT_FALSE(base::PathExists(archive_path_1));
+  EXPECT_FALSE(base::PathExists(archive_path_2));
+  EXPECT_TRUE(base::PathExists(archive_path_3));
+}
+
+TEST_F(ArchiveManagerTest, DeleteArchive) {

[jianli, 2016/05/13 23:50:48]

Please also test the case that the archive does not exist.

[fgorski, 2016/05/16 17:46:52]

Done.

+  base::FilePath archive_path;
+  EXPECT_TRUE(base::CreateTemporaryFileInDir(temp_path(), &archive_path));
+
+  manager()->DeleteArchive(
+      archive_path,
+      base::Bind(&ArchiveManagerTest::Callback, base::Unretained(this)));
+  PumpLoop();
+  EXPECT_EQ(CallbackStatus::CALLED_TRUE, callback_status());
+  EXPECT_FALSE(base::PathExists(archive_path));
+}
+
+}  // namespace offline_pages