diff --git a/include/rocksdb/env.h b/include/rocksdb/env.h
index b0cd40ddd..70244bb31 100644
--- a/include/rocksdb/env.h
+++ b/include/rocksdb/env.h
@@ -798,7 +798,6 @@ class EnvWrapper : public Env {
 // when it is no longer needed.
 // *base_env must remain live while the result is in use.
 Env* NewMemEnv(Env* base_env);
-Env* NewTestMemEnv(Env* base_env);
 
 }  // namespace rocksdb
 
diff --git a/util/env_mem.cc b/util/env_mem.cc
deleted file mode 100644
index 43337da7e..000000000
--- a/util/env_mem.cc
+++ /dev/null
@@ -1,367 +0,0 @@
-// 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.
-
-#include "rocksdb/env.h"
-#include "rocksdb/status.h"
-#include "port/port.h"
-#include "util/mutexlock.h"
-#include <map>
-#include <string.h>
-#include <string>
-#include <vector>
-
-namespace rocksdb {
-
-namespace {
-
-class MemFile {
- public:
-  enum Mode {
-    READ = 0,
-    WRITE = 1,
-  };
-
-  MemFile(Mode mode) : mode_(mode), refs_(0) {}
-
-  void Ref() {
-    MutexLock lock(&mutex_);
-    ++refs_;
-  }
-
-  void Unref() {
-    bool do_delete = false;
-    {
-      MutexLock lock(&mutex_);
-      --refs_;
-      assert(refs_ >= 0);
-      if (refs_ <= 0) {
-        do_delete = true;
-      }
-    }
-
-    if (do_delete) {
-      delete this;
-    }
-  }
-
-  void SetMode(Mode mode) {
-    mode_ = mode;
-  }
-
-  uint64_t Size() const { return data_.size(); }
-
-  Status Read(uint64_t offset, size_t n, Slice* result, char* scratch) const {
-    assert(mode_ == READ);
-    if (offset > Size()) {
-      return Status::IOError("Offset greater than file size.");
-    }
-    const uint64_t available = Size() - offset;
-    if (n > available) {
-      n = available;
-    }
-    if (n == 0) {
-      *result = Slice();
-      return Status::OK();
-    }
-    if (scratch) {
-      memcpy(scratch, &(data_[offset]), n);
-      *result = Slice(scratch, n);
-    } else {
-      *result = Slice(&(data_[offset]), n);
-    }
-    return Status::OK();
-  }
-
-  Status Append(const Slice& data) {
-    assert(mode_ == WRITE);
-    data_.append(data.data(), data.size());
-    return Status::OK();
-  }
-
-  Status Fsync() {
-    return Status::OK();
-  }
-
- private:
-  // Private since only Unref() should be used to delete it.
-  ~MemFile() {
-    assert(refs_ == 0);
-  }
-
-  // No copying allowed.
-  MemFile(const MemFile&);
-  void operator=(const MemFile&);
-
-  Mode mode_;
-  port::Mutex mutex_;
-  int refs_;  // Protected by mutex_;
-
-  std::string data_;
-};
-
-class SequentialFileImpl : public SequentialFile {
- public:
-  explicit SequentialFileImpl(MemFile* file) : file_(file), pos_(0) {
-    file_->Ref();
-  }
-
-  ~SequentialFileImpl() {
-    file_->Unref();
-  }
-
-  virtual Status Read(size_t n, Slice* result, char* scratch) {
-    Status s = file_->Read(pos_, n, result, scratch);
-    if (s.ok()) {
-      pos_ += result->size();
-    }
-    return s;
-  }
-
-  virtual Status Skip(uint64_t n) {
-    if (pos_ > file_->Size()) {
-      return Status::IOError("pos_ > file_->Size()");
-    }
-    const size_t available = file_->Size() - pos_;
-    if (n > available) {
-      n = available;
-    }
-    pos_ += n;
-    return Status::OK();
-  }
-
- private:
-  MemFile* file_;
-  size_t pos_;
-};
-
-class RandomAccessFileImpl : public RandomAccessFile {
- public:
-  explicit RandomAccessFileImpl(MemFile* file) : file_(file) {
-    file_->Ref();
-  }
-
-  ~RandomAccessFileImpl() {
-    file_->Unref();
-  }
-
-  virtual Status Read(uint64_t offset, size_t n, Slice* result,
-                      char* scratch) const {
-    return file_->Read(offset, n, result, scratch);
-  }
-
- private:
-  MemFile* file_;
-};
-
-class WritableFileImpl : public WritableFile {
- public:
-  WritableFileImpl(MemFile* file) : file_(file) {
-    file_->Ref();
-  }
-
-  ~WritableFileImpl() {
-    file_->Unref();
-  }
-
-  virtual Status Append(const Slice& data) {
-    return file_->Append(data);
-  }
-
-  virtual Status Close() {
-    return Status::OK();
-  }
-
-  virtual Status Flush() {
-    return Status::OK();
-  }
-
-  virtual Status Sync() {
-    return file_->Fsync();
-  }
-
- private:
-  MemFile* file_;
-};
-
-class TestMemDirectory : public Directory {
- public:
-  virtual Status Fsync() { return Status::OK(); }
-};
-
-class TestMemEnv : public EnvWrapper {
- public:
-  explicit TestMemEnv(Env* base_env) : EnvWrapper(base_env) { }
-
-  virtual ~TestMemEnv() {
-    for (FileSystem::iterator i = file_map_.begin(); i != file_map_.end(); ++i){
-      i->second->Unref();
-    }
-  }
-
-  // Partial implementation of the Env interface.
-  virtual Status NewSequentialFile(const std::string& fname,
-                                   unique_ptr<SequentialFile>* result,
-                                   const EnvOptions& soptions) {
-    MutexLock lock(&mutex_);
-    if (file_map_.find(fname) == file_map_.end()) {
-      *result = NULL;
-      return Status::IOError(fname, "File not found");
-    }
-    auto* f = file_map_[fname];
-    f->SetMode(MemFile::READ);
-    result->reset(new SequentialFileImpl(f));
-    return Status::OK();
-  }
-
-  virtual Status NewRandomAccessFile(const std::string& fname,
-                                     unique_ptr<RandomAccessFile>* result,
-                                     const EnvOptions& soptions) {
-    MutexLock lock(&mutex_);
-    if (file_map_.find(fname) == file_map_.end()) {
-      *result = NULL;
-      return Status::IOError(fname, "File not found");
-    }
-    auto* f = file_map_[fname];
-    f->SetMode(MemFile::READ);
-    result->reset(new RandomAccessFileImpl(f));
-    return Status::OK();
-  }
-
-  virtual Status NewWritableFile(const std::string& fname,
-                                 unique_ptr<WritableFile>* result,
-                                 const EnvOptions& soptions) {
-    MutexLock lock(&mutex_);
-    if (file_map_.find(fname) != file_map_.end()) {
-      DeleteFileInternal(fname);
-    }
-    MemFile* file = new MemFile(MemFile::WRITE);
-    file->Ref();
-    file_map_[fname] = file;
-
-    result->reset(new WritableFileImpl(file));
-    return Status::OK();
-  }
-
-  virtual Status NewRandomRWFile(const std::string& fname,
-                                 unique_ptr<RandomRWFile>* result,
-                                 const EnvOptions& options) {
-    return Status::OK();
-  }
-
-  virtual Status NewDirectory(const std::string& name,
-                              unique_ptr<Directory>* result) {
-    result->reset(new TestMemDirectory());
-    return Status::OK();
-  }
-
-  virtual bool FileExists(const std::string& fname) {
-    MutexLock lock(&mutex_);
-    return file_map_.find(fname) != file_map_.end();
-  }
-
-  virtual Status GetChildren(const std::string& dir,
-                             std::vector<std::string>* result) {
-    MutexLock lock(&mutex_);
-    result->clear();
-
-    for (FileSystem::iterator i = file_map_.begin(); i != file_map_.end(); ++i){
-      const std::string& filename = i->first;
-
-      if (filename.size() >= dir.size() + 1 && filename[dir.size()] == '/' &&
-          Slice(filename).starts_with(Slice(dir))) {
-        result->push_back(filename.substr(dir.size() + 1));
-      }
-    }
-
-    return Status::OK();
-  }
-
-  void DeleteFileInternal(const std::string& fname) {
-    if (file_map_.find(fname) == file_map_.end()) {
-      return;
-    }
-
-    file_map_[fname]->Unref();
-    file_map_.erase(fname);
-  }
-
-  virtual Status DeleteFile(const std::string& fname) {
-    MutexLock lock(&mutex_);
-    if (file_map_.find(fname) == file_map_.end()) {
-      return Status::IOError(fname, "File not found");
-    }
-
-    DeleteFileInternal(fname);
-    return Status::OK();
-  }
-
-  virtual Status CreateDir(const std::string& dirname) {
-    return Status::OK();
-  }
-
-  virtual Status CreateDirIfMissing(const std::string& dirname) {
-    return Status::OK();
-  }
-
-  virtual Status DeleteDir(const std::string& dirname) {
-    return Status::OK();
-  }
-
-  virtual Status GetFileSize(const std::string& fname, uint64_t* file_size) {
-    MutexLock lock(&mutex_);
-    if (file_map_.find(fname) == file_map_.end()) {
-      return Status::IOError(fname, "File not found");
-    }
-
-    *file_size = file_map_[fname]->Size();
-    return Status::OK();
-  }
-
-  virtual Status GetFileModificationTime(const std::string& fname,
-                                         uint64_t* time) {
-    return Status::NotSupported("getFileMTime", "Not supported in MemEnv");
-  }
-
-  virtual Status RenameFile(const std::string& src,
-                            const std::string& target) {
-    MutexLock lock(&mutex_);
-    if (file_map_.find(src) == file_map_.end()) {
-      return Status::IOError(src, "File not found");
-    }
-
-    DeleteFileInternal(target);
-    file_map_[target] = file_map_[src];
-    file_map_.erase(src);
-    return Status::OK();
-  }
-
-  virtual Status LockFile(const std::string& fname, FileLock** lock) {
-    *lock = new FileLock;
-    return Status::OK();
-  }
-
-  virtual Status UnlockFile(FileLock* lock) {
-    delete lock;
-    return Status::OK();
-  }
-
-  virtual Status GetTestDirectory(std::string* path) {
-    *path = "/test";
-    return Status::OK();
-  }
-
- private:
-  // 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_.
-};
-
-}  // namespace
-
-Env* NewTestMemEnv(Env* base_env) {
-  return new TestMemEnv(base_env);
-}
-
-}  // namespace rocksdb
diff --git a/util/env_mem_test.cc b/util/env_mem_test.cc
deleted file mode 100644
index ea3ed61a0..000000000
--- a/util/env_mem_test.cc
+++ /dev/null
@@ -1,231 +0,0 @@
-// 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.
-
-#include "db/db_impl.h"
-#include "rocksdb/db.h"
-#include "rocksdb/env.h"
-#include "util/testharness.h"
-#include <memory>
-#include <string>
-#include <vector>
-
-namespace rocksdb {
-
-class MemEnvTest {
- public:
-  Env* env_;
-  const EnvOptions soptions_;
-
-  MemEnvTest()
-      : env_(NewMemEnv(Env::Default())) {
-  }
-  ~MemEnvTest() {
-    delete env_;
-  }
-};
-
-TEST(MemEnvTest, Basics) {
-  uint64_t file_size;
-  unique_ptr<WritableFile> writable_file;
-  std::vector<std::string> children;
-
-  ASSERT_OK(env_->CreateDir("/dir"));
-
-  // Check that the directory is empty.
-  ASSERT_TRUE(!env_->FileExists("/dir/non_existent"));
-  ASSERT_TRUE(!env_->GetFileSize("/dir/non_existent", &file_size).ok());
-  ASSERT_OK(env_->GetChildren("/dir", &children));
-  ASSERT_EQ(0U, children.size());
-
-  // Create a file.
-  ASSERT_OK(env_->NewWritableFile("/dir/f", &writable_file, soptions_));
-  writable_file.reset();
-
-  // Check that the file exists.
-  ASSERT_TRUE(env_->FileExists("/dir/f"));
-  ASSERT_OK(env_->GetFileSize("/dir/f", &file_size));
-  ASSERT_EQ(0U, file_size);
-  ASSERT_OK(env_->GetChildren("/dir", &children));
-  ASSERT_EQ(1U, children.size());
-  ASSERT_EQ("f", children[0]);
-
-  // Write to the file.
-  ASSERT_OK(env_->NewWritableFile("/dir/f", &writable_file, soptions_));
-  ASSERT_OK(writable_file->Append("abc"));
-  writable_file.reset();
-
-  // Check for expected size.
-  ASSERT_OK(env_->GetFileSize("/dir/f", &file_size));
-  ASSERT_EQ(3U, file_size);
-
-  // Check that renaming works.
-  ASSERT_TRUE(!env_->RenameFile("/dir/non_existent", "/dir/g").ok());
-  ASSERT_OK(env_->RenameFile("/dir/f", "/dir/g"));
-  ASSERT_TRUE(!env_->FileExists("/dir/f"));
-  ASSERT_TRUE(env_->FileExists("/dir/g"));
-  ASSERT_OK(env_->GetFileSize("/dir/g", &file_size));
-  ASSERT_EQ(3U, file_size);
-
-  // Check that opening non-existent file fails.
-  unique_ptr<SequentialFile> seq_file;
-  unique_ptr<RandomAccessFile> rand_file;
-  ASSERT_TRUE(!env_->NewSequentialFile("/dir/non_existent", &seq_file,
-                                       soptions_).ok());
-  ASSERT_TRUE(!seq_file);
-  ASSERT_TRUE(!env_->NewRandomAccessFile("/dir/non_existent", &rand_file,
-                                         soptions_).ok());
-  ASSERT_TRUE(!rand_file);
-
-  // Check that deleting works.
-  ASSERT_TRUE(!env_->DeleteFile("/dir/non_existent").ok());
-  ASSERT_OK(env_->DeleteFile("/dir/g"));
-  ASSERT_TRUE(!env_->FileExists("/dir/g"));
-  ASSERT_OK(env_->GetChildren("/dir", &children));
-  ASSERT_EQ(0U, children.size());
-  ASSERT_OK(env_->DeleteDir("/dir"));
-}
-
-TEST(MemEnvTest, ReadWrite) {
-  unique_ptr<WritableFile> writable_file;
-  unique_ptr<SequentialFile> seq_file;
-  unique_ptr<RandomAccessFile> rand_file;
-  Slice result;
-  char scratch[100];
-
-  ASSERT_OK(env_->CreateDir("/dir"));
-
-  ASSERT_OK(env_->NewWritableFile("/dir/f", &writable_file, soptions_));
-  ASSERT_OK(writable_file->Append("hello "));
-  ASSERT_OK(writable_file->Append("world"));
-  writable_file.reset();
-
-  // Read sequentially.
-  ASSERT_OK(env_->NewSequentialFile("/dir/f", &seq_file, soptions_));
-  ASSERT_OK(seq_file->Read(5, &result, scratch)); // Read "hello".
-  ASSERT_EQ(0, result.compare("hello"));
-  ASSERT_OK(seq_file->Skip(1));
-  ASSERT_OK(seq_file->Read(1000, &result, scratch)); // Read "world".
-  ASSERT_EQ(0, result.compare("world"));
-  ASSERT_OK(seq_file->Read(1000, &result, scratch)); // Try reading past EOF.
-  ASSERT_EQ(0U, result.size());
-  ASSERT_OK(seq_file->Skip(100)); // Try to skip past end of file.
-  ASSERT_OK(seq_file->Read(1000, &result, scratch));
-  ASSERT_EQ(0U, result.size());
-
-  // Random reads.
-  ASSERT_OK(env_->NewRandomAccessFile("/dir/f", &rand_file, soptions_));
-  ASSERT_OK(rand_file->Read(6, 5, &result, scratch)); // Read "world".
-  ASSERT_EQ(0, result.compare("world"));
-  ASSERT_OK(rand_file->Read(0, 5, &result, scratch)); // Read "hello".
-  ASSERT_EQ(0, result.compare("hello"));
-  ASSERT_OK(rand_file->Read(10, 100, &result, scratch)); // Read "d".
-  ASSERT_EQ(0, result.compare("d"));
-
-  // Too high offset.
-  ASSERT_TRUE(!rand_file->Read(1000, 5, &result, scratch).ok());
-}
-
-TEST(MemEnvTest, Locks) {
-  FileLock* lock;
-
-  // These are no-ops, but we test they return success.
-  ASSERT_OK(env_->LockFile("some file", &lock));
-  ASSERT_OK(env_->UnlockFile(lock));
-}
-
-TEST(MemEnvTest, Misc) {
-  std::string test_dir;
-  ASSERT_OK(env_->GetTestDirectory(&test_dir));
-  ASSERT_TRUE(!test_dir.empty());
-
-  unique_ptr<WritableFile> writable_file;
-  ASSERT_OK(env_->NewWritableFile("/a/b", &writable_file, soptions_));
-
-  // These are no-ops, but we test they return success.
-  ASSERT_OK(writable_file->Sync());
-  ASSERT_OK(writable_file->Flush());
-  ASSERT_OK(writable_file->Close());
-  writable_file.reset();
-}
-
-TEST(MemEnvTest, LargeWrite) {
-  const size_t kWriteSize = 300 * 1024;
-  char* scratch = new char[kWriteSize * 2];
-
-  std::string write_data;
-  for (size_t i = 0; i < kWriteSize; ++i) {
-    write_data.append(1, static_cast<char>(i));
-  }
-
-  unique_ptr<WritableFile> writable_file;
-  ASSERT_OK(env_->NewWritableFile("/dir/f", &writable_file, soptions_));
-  ASSERT_OK(writable_file->Append("foo"));
-  ASSERT_OK(writable_file->Append(write_data));
-  writable_file.reset();
-
-  unique_ptr<SequentialFile> seq_file;
-  Slice result;
-  ASSERT_OK(env_->NewSequentialFile("/dir/f", &seq_file, soptions_));
-  ASSERT_OK(seq_file->Read(3, &result, scratch)); // Read "foo".
-  ASSERT_EQ(0, result.compare("foo"));
-
-  size_t read = 0;
-  std::string read_data;
-  while (read < kWriteSize) {
-    ASSERT_OK(seq_file->Read(kWriteSize - read, &result, scratch));
-    read_data.append(result.data(), result.size());
-    read += result.size();
-  }
-  ASSERT_TRUE(write_data == read_data);
-  delete [] scratch;
-}
-
-TEST(MemEnvTest, DBTest) {
-  Options options;
-  options.create_if_missing = true;
-  options.env = env_;
-  DB* db;
-
-  const Slice keys[] = {Slice("aaa"), Slice("bbb"), Slice("ccc")};
-  const Slice vals[] = {Slice("foo"), Slice("bar"), Slice("baz")};
-
-  ASSERT_OK(DB::Open(options, "/dir/db", &db));
-  for (size_t i = 0; i < 3; ++i) {
-    ASSERT_OK(db->Put(WriteOptions(), keys[i], vals[i]));
-  }
-
-  for (size_t i = 0; i < 3; ++i) {
-    std::string res;
-    ASSERT_OK(db->Get(ReadOptions(), keys[i], &res));
-    ASSERT_TRUE(res == vals[i]);
-  }
-
-  Iterator* iterator = db->NewIterator(ReadOptions());
-  iterator->SeekToFirst();
-  for (size_t i = 0; i < 3; ++i) {
-    ASSERT_TRUE(iterator->Valid());
-    ASSERT_TRUE(keys[i] == iterator->key());
-    ASSERT_TRUE(vals[i] == iterator->value());
-    iterator->Next();
-  }
-  ASSERT_TRUE(!iterator->Valid());
-  delete iterator;
-
-  DBImpl* dbi = reinterpret_cast<DBImpl*>(db);
-  ASSERT_OK(dbi->TEST_FlushMemTable());
-
-  for (size_t i = 0; i < 3; ++i) {
-    std::string res;
-    ASSERT_OK(db->Get(ReadOptions(), keys[i], &res));
-    ASSERT_TRUE(res == vals[i]);
-  }
-
-  delete db;
-}
-
-}  // namespace rocksdb
-
-int main(int argc, char** argv) {
-  return rocksdb::test::RunAllTests();
-}