diff --git a/quic/test_tools/qpack/qpack_decoder_test_utils.cc b/quic/test_tools/qpack/qpack_decoder_test_utils.cc
new file mode 100644
index 0000000..2b835ae
--- /dev/null
+++ b/quic/test_tools/qpack/qpack_decoder_test_utils.cc
@@ -0,0 +1,88 @@
+// Copyright (c) 2018 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 "net/third_party/quiche/src/quic/test_tools/qpack/qpack_decoder_test_utils.h"
+
+#include <algorithm>
+#include <cstddef>
+#include <utility>
+
+#include "net/third_party/quiche/src/quic/platform/api/quic_test.h"
+
+namespace quic {
+namespace test {
+
+void NoopEncoderStreamErrorDelegate::OnEncoderStreamError(
+    QuicStringPiece /*error_message*/) {}
+
+TestHeadersHandler::TestHeadersHandler()
+    : decoding_completed_(false), decoding_error_detected_(false) {}
+
+void TestHeadersHandler::OnHeaderDecoded(QuicStringPiece name,
+                                         QuicStringPiece value) {
+  ASSERT_FALSE(decoding_completed_);
+  ASSERT_FALSE(decoding_error_detected_);
+
+  header_list_.AppendValueOrAddHeader(name, value);
+}
+
+void TestHeadersHandler::OnDecodingCompleted() {
+  ASSERT_FALSE(decoding_completed_);
+  ASSERT_FALSE(decoding_error_detected_);
+
+  decoding_completed_ = true;
+}
+
+void TestHeadersHandler::OnDecodingErrorDetected(
+    QuicStringPiece error_message) {
+  ASSERT_FALSE(decoding_completed_);
+  ASSERT_FALSE(decoding_error_detected_);
+
+  decoding_error_detected_ = true;
+  error_message_.assign(error_message.data(), error_message.size());
+}
+
+spdy::SpdyHeaderBlock TestHeadersHandler::ReleaseHeaderList() {
+  DCHECK(decoding_completed_);
+  DCHECK(!decoding_error_detected_);
+
+  return std::move(header_list_);
+}
+
+bool TestHeadersHandler::decoding_completed() const {
+  return decoding_completed_;
+}
+
+bool TestHeadersHandler::decoding_error_detected() const {
+  return decoding_error_detected_;
+}
+
+const std::string& TestHeadersHandler::error_message() const {
+  DCHECK(decoding_error_detected_);
+  return error_message_;
+}
+
+void QpackDecode(
+    uint64_t maximum_dynamic_table_capacity,
+    uint64_t maximum_blocked_streams,
+    QpackDecoder::EncoderStreamErrorDelegate* encoder_stream_error_delegate,
+    QpackStreamSenderDelegate* decoder_stream_sender_delegate,
+    QpackProgressiveDecoder::HeadersHandlerInterface* handler,
+    const FragmentSizeGenerator& fragment_size_generator,
+    QuicStringPiece data) {
+  QpackDecoder decoder(maximum_dynamic_table_capacity, maximum_blocked_streams,
+                       encoder_stream_error_delegate);
+  decoder.set_qpack_stream_sender_delegate(decoder_stream_sender_delegate);
+  auto progressive_decoder =
+      decoder.CreateProgressiveDecoder(/* stream_id = */ 1, handler);
+  while (!data.empty()) {
+    size_t fragment_size = std::min(fragment_size_generator(), data.size());
+    progressive_decoder->Decode(data.substr(0, fragment_size));
+    data = data.substr(fragment_size);
+  }
+  progressive_decoder->EndHeaderBlock();
+}
+
+}  // namespace test
+}  // namespace quic