diff --git a/http2/http2_constants_test_util.h b/http2/http2_constants_test_util.h
new file mode 100644
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--- /dev/null
+++ b/http2/http2_constants_test_util.h
@@ -0,0 +1,34 @@
+// Copyright 2016 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.
+
+#ifndef QUICHE_HTTP2_HTTP2_CONSTANTS_TEST_UTIL_H_
+#define QUICHE_HTTP2_HTTP2_CONSTANTS_TEST_UTIL_H_
+
+#include <cstdint>
+#include <vector>
+
+#include "net/third_party/quiche/src/http2/http2_constants.h"
+
+namespace http2 {
+namespace test {
+
+// Returns a vector of all supported RST_STREAM and GOAWAY error codes.
+std::vector<Http2ErrorCode> AllHttp2ErrorCodes();
+
+// Returns a vector of all supported parameters in SETTINGS frames.
+std::vector<Http2SettingsParameter> AllHttp2SettingsParameters();
+
+// Returns a mask of flags supported for the specified frame type. Returns
+// zero for unknown frame types.
+uint8_t KnownFlagsMaskForFrameType(Http2FrameType type);
+
+// Returns a mask of flag bits known to be invalid for the frame type.
+// For unknown frame types, the mask is zero; i.e., we don't know that any
+// are invalid.
+uint8_t InvalidFlagMaskForFrameType(Http2FrameType type);
+
+}  // namespace test
+}  // namespace http2
+
+#endif  // QUICHE_HTTP2_HTTP2_CONSTANTS_TEST_UTIL_H_