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diff --git a/testing/string_write_stream.h b/testing/string_write_stream.h
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+++ b/testing/string_write_stream.h
@@ -0,0 +1,30 @@
+// Copyright 2018 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef TESTING_STRING_WRITE_STREAM_H_
+#define TESTING_STRING_WRITE_STREAM_H_
+
+#include <sstream>
+#include <string>
+
+#include "core/fxcrt/fx_stream.h"
+
+class StringWriteStream : public IFX_SeekableWriteStream {
+ public:
+  StringWriteStream();
+  ~StringWriteStream() override;
+
+  // IFX_SeekableWriteStream
+  FX_FILESIZE GetSize() override;
+  bool Flush() override;
+  bool WriteBlock(const void* pData, FX_FILESIZE offset, size_t size) override;
+  bool WriteString(const ByteStringView& str) override;
+
+  std::string ToString() const { return stream_.str(); }
+
+ private:
+  std::ostringstream stream_;
+};
+
+#endif  // TESTING_STRING_WRITE_STREAM_H_