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diff --git a/src/rocksdb/env/mock_env.h b/src/rocksdb/env/mock_env.h
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+++ b/src/rocksdb/env/mock_env.h
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+//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
+//  This source code is licensed under both the GPLv2 (found in the
+//  COPYING file in the root directory) and Apache 2.0 License
+//  (found in the LICENSE.Apache file in the root directory).
+//
+// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file. See the AUTHORS file for names of contributors.
+#pragma once
+
+#include <atomic>
+#include <map>
+#include <string>
+#include <vector>
+#include "rocksdb/env.h"
+#include "rocksdb/status.h"
+#include "port/port.h"
+#include "util/mutexlock.h"
+
+namespace rocksdb {
+
+class MemFile;
+class MockEnv : public EnvWrapper {
+ public:
+  explicit MockEnv(Env* base_env);
+
+  virtual ~MockEnv();
+
+  // Partial implementation of the Env interface.
+  virtual Status NewSequentialFile(const std::string& fname,
+                                   std::unique_ptr<SequentialFile>* result,
+                                   const EnvOptions& soptions) override;
+
+  virtual Status NewRandomAccessFile(const std::string& fname,
+                                     std::unique_ptr<RandomAccessFile>* result,
+                                     const EnvOptions& soptions) override;
+
+  virtual Status NewRandomRWFile(const std::string& fname,
+                                 std::unique_ptr<RandomRWFile>* result,
+                                 const EnvOptions& options) override;
+
+  virtual Status ReuseWritableFile(const std::string& fname,
+                                   const std::string& old_fname,
+                                   std::unique_ptr<WritableFile>* result,
+                                   const EnvOptions& options) override;
+
+  virtual Status NewWritableFile(const std::string& fname,
+                                 std::unique_ptr<WritableFile>* result,
+                                 const EnvOptions& env_options) override;
+
+  virtual Status NewDirectory(const std::string& name,
+                              std::unique_ptr<Directory>* result) override;
+
+  virtual Status FileExists(const std::string& fname) override;
+
+  virtual Status GetChildren(const std::string& dir,
+                             std::vector<std::string>* result) override;
+
+  void DeleteFileInternal(const std::string& fname);
+
+  virtual Status DeleteFile(const std::string& fname) override;
+
+  virtual Status Truncate(const std::string& fname, size_t size) override;
+
+  virtual Status CreateDir(const std::string& dirname) override;
+
+  virtual Status CreateDirIfMissing(const std::string& dirname) override;
+
+  virtual Status DeleteDir(const std::string& dirname) override;
+
+  virtual Status GetFileSize(const std::string& fname,
+                             uint64_t* file_size) override;
+
+  virtual Status GetFileModificationTime(const std::string& fname,
+                                         uint64_t* time) override;
+
+  virtual Status RenameFile(const std::string& src,
+                            const std::string& target) override;
+
+  virtual Status LinkFile(const std::string& src,
+                          const std::string& target) override;
+
+  virtual Status NewLogger(const std::string& fname,
+                           std::shared_ptr<Logger>* result) override;
+
+  virtual Status LockFile(const std::string& fname, FileLock** flock) override;
+
+  virtual Status UnlockFile(FileLock* flock) override;
+
+  virtual Status GetTestDirectory(std::string* path) override;
+
+  // Results of these can be affected by FakeSleepForMicroseconds()
+  virtual Status GetCurrentTime(int64_t* unix_time) override;
+  virtual uint64_t NowMicros() override;
+  virtual uint64_t NowNanos() override;
+
+  Status CorruptBuffer(const std::string& fname);
+
+  // Doesn't really sleep, just affects output of GetCurrentTime(), NowMicros()
+  // and NowNanos()
+  void FakeSleepForMicroseconds(int64_t micros);
+
+ private:
+  std::string NormalizePath(const std::string path);
+
+  // Map from filenames to MemFile objects, representing a simple file system.
+  typedef std::map<std::string, MemFile*> FileSystem;
+  port::Mutex mutex_;
+  FileSystem file_map_;  // Protected by mutex_.
+
+  std::atomic<int64_t> fake_sleep_micros_;
+};
+
+}  // namespace rocksdb