diff --git a/http2/http2_structures_test_util.h b/http2/http2_structures_test_util.h
new file mode 100644
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+++ b/http2/http2_structures_test_util.h
@@ -0,0 +1,59 @@
+// 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_STRUCTURES_TEST_UTIL_H_
+#define QUICHE_HTTP2_HTTP2_STRUCTURES_TEST_UTIL_H_
+
+#include "testing/gtest/include/gtest/gtest.h"
+#include "net/third_party/quiche/src/http2/http2_structures.h"
+#include "net/third_party/quiche/src/http2/platform/api/http2_string.h"
+#include "net/third_party/quiche/src/http2/test_tools/http2_random.h"
+#include "net/third_party/quiche/src/http2/tools/http2_frame_builder.h"
+
+namespace http2 {
+namespace test {
+
+template <class S>
+Http2String SerializeStructure(const S& s) {
+  Http2FrameBuilder fb;
+  fb.Append(s);
+  EXPECT_EQ(S::EncodedSize(), fb.size());
+  return fb.buffer();
+}
+
+// Randomize the members of out, in a manner that yields encodeable contents
+// (e.g. a "uint24" field has only the low 24 bits set).
+void Randomize(Http2FrameHeader* out, Http2Random* rng);
+void Randomize(Http2PriorityFields* out, Http2Random* rng);
+void Randomize(Http2RstStreamFields* out, Http2Random* rng);
+void Randomize(Http2SettingFields* out, Http2Random* rng);
+void Randomize(Http2PushPromiseFields* out, Http2Random* rng);
+void Randomize(Http2PingFields* out, Http2Random* rng);
+void Randomize(Http2GoAwayFields* out, Http2Random* rng);
+void Randomize(Http2WindowUpdateFields* out, Http2Random* rng);
+void Randomize(Http2AltSvcFields* out, Http2Random* rng);
+
+// Clear bits of header->flags that are known to be invalid for the
+// type. For unknown frame types, no change is made.
+void ScrubFlagsOfHeader(Http2FrameHeader* header);
+
+// Is the frame with this header padded? Only true for known/supported frame
+// types.
+bool FrameIsPadded(const Http2FrameHeader& header);
+
+// Does the frame with this header have Http2PriorityFields?
+bool FrameHasPriority(const Http2FrameHeader& header);
+
+// Does the frame with this header have a variable length payload (including
+// empty) payload (e.g. DATA or HEADERS)? Really a test of the frame type.
+bool FrameCanHavePayload(const Http2FrameHeader& header);
+
+// Does the frame with this header have a variable length HPACK payload
+// (including empty) payload (e.g. HEADERS)? Really a test of the frame type.
+bool FrameCanHaveHpackPayload(const Http2FrameHeader& header);
+
+}  // namespace test
+}  // namespace http2
+
+#endif  // QUICHE_HTTP2_HTTP2_STRUCTURES_TEST_UTIL_H_