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diff --git a/src/leveldb/util/testutil.h b/src/leveldb/util/testutil.h
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+// 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.
+
+#ifndef STORAGE_LEVELDB_UTIL_TESTUTIL_H_
+#define STORAGE_LEVELDB_UTIL_TESTUTIL_H_
+
+#include "helpers/memenv/memenv.h"
+#include "leveldb/env.h"
+#include "leveldb/slice.h"
+#include "util/random.h"
+
+namespace leveldb {
+namespace test {
+
+// Store in *dst a random string of length "len" and return a Slice that
+// references the generated data.
+Slice RandomString(Random* rnd, int len, std::string* dst);
+
+// Return a random key with the specified length that may contain interesting
+// characters (e.g. \x00, \xff, etc.).
+std::string RandomKey(Random* rnd, int len);
+
+// Store in *dst a string of length "len" that will compress to
+// "N*compressed_fraction" bytes and return a Slice that references
+// the generated data.
+Slice CompressibleString(Random* rnd, double compressed_fraction, size_t len,
+                         std::string* dst);
+
+// A wrapper that allows injection of errors.
+class ErrorEnv : public EnvWrapper {
+ public:
+  bool writable_file_error_;
+  int num_writable_file_errors_;
+
+  ErrorEnv()
+      : EnvWrapper(NewMemEnv(Env::Default())),
+        writable_file_error_(false),
+        num_writable_file_errors_(0) {}
+  ~ErrorEnv() override { delete target(); }
+
+  Status NewWritableFile(const std::string& fname,
+                         WritableFile** result) override {
+    if (writable_file_error_) {
+      ++num_writable_file_errors_;
+      *result = nullptr;
+      return Status::IOError(fname, "fake error");
+    }
+    return target()->NewWritableFile(fname, result);
+  }
+
+  Status NewAppendableFile(const std::string& fname,
+                           WritableFile** result) override {
+    if (writable_file_error_) {
+      ++num_writable_file_errors_;
+      *result = nullptr;
+      return Status::IOError(fname, "fake error");
+    }
+    return target()->NewAppendableFile(fname, result);
+  }
+};
+
+}  // namespace test
+}  // namespace leveldb
+
+#endif  // STORAGE_LEVELDB_UTIL_TESTUTIL_H_