Convert drive::FileWriteHelper to a single function for simplification.

chrome/browser/chromeos/drive/file_write_helper_unittest.cc

-// Copyright (c) 2012 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/chromeos/drive/file_write_helper.h"
-
-#include "base/bind.h"
-#include "chrome/browser/chromeos/drive/dummy_file_system.h"
-#include "chrome/browser/chromeos/drive/test_util.h"
-#include "content/public/test/test_browser_thread_bundle.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-namespace drive {
-
-namespace {
-
-const base::FilePath::CharType kDrivePath[] =
-    FILE_PATH_LITERAL("drive/root/file.txt");
-const base::FilePath::CharType kInvalidPath[] =
-    FILE_PATH_LITERAL("drive/invalid/path");
-const base::FilePath::CharType kLocalPath[] =
-    FILE_PATH_LITERAL("/tmp/local.txt");
-
-class TestFileSystem : public DummyFileSystem {
- public:
-  TestFileSystem() : num_closed_(0) {
-  }
-
-  int num_closed() const { return num_closed_; }
-
-  // Mimics OpenFile. It fails if the |file_path| points to a hosted document.
-  virtual void OpenFile(const base::FilePath& file_path,
-                        OpenMode open_mode,
-                        const OpenFileCallback& callback) OVERRIDE {
-    EXPECT_EQ(OPEN_OR_CREATE_FILE, open_mode);
-
-    // Emulate a case of opening a hosted document.
-    if (file_path == base::FilePath(kInvalidPath)) {
-      callback.Run(FILE_ERROR_INVALID_OPERATION, base::FilePath(),
-                   base::Closure());
-      return;
-    }
-
-    callback.Run(FILE_ERROR_OK, base::FilePath(kLocalPath),
-                 base::Bind(&TestFileSystem::CloseFile,
-                            base::Unretained(this)));
-  }
-
- private:
-
-  void CloseFile() {
-    ++num_closed_;
-  }
-
-  int num_closed_;
-};
-
-}  // namespace
-
-class FileWriteHelperTest : public testing::Test {
- public:
-  FileWriteHelperTest()
-      : test_file_system_(new TestFileSystem) {
-  }
-
- protected:
-  content::TestBrowserThreadBundle thread_bundle_;
-  scoped_ptr<TestFileSystem> test_file_system_;
-};
-
-TEST_F(FileWriteHelperTest, PrepareFileForWritingSuccess) {
-  FileWriteHelper file_write_helper(test_file_system_.get());
-  FileError error = FILE_ERROR_FAILED;
-  base::FilePath path;
-  // The file should successfully be opened.
-  file_write_helper.PrepareWritableFileAndRun(
-      base::FilePath(kDrivePath),
-      google_apis::test_util::CreateCopyResultCallback(&error, &path));
-  test_util::RunBlockingPoolTask();
-
-  EXPECT_EQ(FILE_ERROR_OK, error);
-  EXPECT_EQ(kLocalPath, path.value());
-
-  // Make sure that the file is actually closed.
-  EXPECT_EQ(1, test_file_system_->num_closed());
-}
-
-TEST_F(FileWriteHelperTest, PrepareFileForWritingCreateFail) {
-  FileWriteHelper file_write_helper(test_file_system_.get());
-  FileError error = FILE_ERROR_FAILED;
-  base::FilePath path;
-  // Access to kInvalidPath should fail, and FileWriteHelper should not try to
-  // open or close the file.
-  file_write_helper.PrepareWritableFileAndRun(
-      base::FilePath(kInvalidPath),
-      google_apis::test_util::CreateCopyResultCallback(&error, &path));
-  test_util::RunBlockingPoolTask();
-
-  EXPECT_EQ(FILE_ERROR_INVALID_OPERATION, error);
-  EXPECT_TRUE(path.empty());
-}
-
-}   // namespace drive