text: // 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 "content/browser/loader/temporary_file_stream.h"
  
  #include <string.h>
  #include <string>
  #include <utility>
  
  #include "base/bind.h"
  #include "base/files/file_path.h"
  #include "base/files/file_util.h"
  #include "base/macros.h"
  #include "base/run_loop.h"
  #include "content/public/test/test_browser_thread_bundle.h"
  #include "net/base/file_stream.h"
  #include "net/base/io_buffer.h"
  #include "net/base/net_errors.h"
  #include "net/base/test_completion_callback.h"
  #include "storage/browser/blob/shareable_file_reference.h"
  #include "testing/gtest/include/gtest/gtest.h"
  
  using storage::ShareableFileReference;
  
  namespace content {
  
  namespace {
  
  const char kTestData[] = "0123456789";
  const int kTestDataSize = arraysize(kTestData) - 1;
  
  class WaitForFileStream {
   public:
    base::File::Error error() const { return error_; }
    net::FileStream* file_stream() const { return file_stream_.get(); }
    ShareableFileReference* deletable_file() const {
      return deletable_file_.get();
    }
  
    void OnFileStreamCreated(base::File::Error error,
                             std::unique_ptr<net::FileStream> file_stream,
                             ShareableFileReference* deletable_file) {
      error_ = error;
      file_stream_ = std::move(file_stream);
      deletable_file_ = deletable_file;
      loop_.Quit();
    }
  
    void Wait() {
      loop_.Run();
    }
  
    void Release() {
      file_stream_.reset(NULL);
      deletable_file_ = NULL;
    }
   private:
    base::RunLoop loop_;
    base::File::Error error_;
    std::unique_ptr<net::FileStream> file_stream_;
    scoped_refptr<ShareableFileReference> deletable_file_;
  };
  
  }  // namespace
  
  TEST(TemporaryFileStreamTest, Basic) {
    TestBrowserThreadBundle thread_bundle(TestBrowserThreadBundle::IO_MAINLOOP);
  
    // Create a temporary.
    WaitForFileStream file_stream_waiter;
    CreateTemporaryFileStream(base::Bind(&WaitForFileStream::OnFileStreamCreated,
                                         base::Unretained(&file_stream_waiter)));
    file_stream_waiter.Wait();
  
    // The temporary should exist.
    EXPECT_EQ(base::File::FILE_OK, file_stream_waiter.error());
    base::FilePath file_path = file_stream_waiter.deletable_file()->path();
    EXPECT_TRUE(base::PathExists(file_path));
  
    // Write some data to the temporary.
    int bytes_written = 0;
    scoped_refptr<net::IOBufferWithSize> buf =
        new net::IOBufferWithSize(kTestDataSize);
    memcpy(buf->data(), kTestData, kTestDataSize);
    scoped_refptr<net::DrainableIOBuffer> drainable =
        new net::DrainableIOBuffer(buf.get(), buf->size());
    while (bytes_written != kTestDataSize) {
      net::TestCompletionCallback write_callback;
      int rv = file_stream_waiter.file_stream()->Write(
          drainable.get(), drainable->BytesRemaining(),
          write_callback.callback());
      if (rv == net::ERR_IO_PENDING)
        rv = write_callback.WaitForResult();
      ASSERT_LT(0, rv);
      drainable->DidConsume(rv);
      bytes_written += rv;
    }
  
    // Verify the data matches.
    std::string contents;
    ASSERT_TRUE(base::ReadFileToString(file_path, &contents));
    EXPECT_EQ(kTestData, contents);
  
    // Close the file.
    net::TestCompletionCallback close_callback;
    int rv = file_stream_waiter.file_stream()->Close(close_callback.callback());
    if (rv == net::ERR_IO_PENDING)
      rv = close_callback.WaitForResult();
    EXPECT_EQ(net::OK, rv);
  
    // Release everything. The file should be gone now.
    file_stream_waiter.Release();
    base::MessageLoop::current()->RunUntilIdle();
  
    // The temporary should be gone now.
    EXPECT_FALSE(base::PathExists(file_path));
  }
  
  }  // content
  