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diff --git a/third_party/jpeg-xl/lib/jpegli/libjpeg_test_util.h b/third_party/jpeg-xl/lib/jpegli/libjpeg_test_util.h
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+++ b/third_party/jpeg-xl/lib/jpegli/libjpeg_test_util.h
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+// Copyright (c) the JPEG XL Project 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 LIB_JPEGLI_LIBJPEG_TEST_UTIL_H_
+#define LIB_JPEGLI_LIBJPEG_TEST_UTIL_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include <vector>
+
+#include "lib/jpegli/test_params.h"
+
+namespace jpegli {
+
+// Verifies that an image encoded with libjpegli can be decoded with libjpeg,
+// and checks that the jpeg coding metadata matches jparams.
+void DecodeAllScansWithLibjpeg(const CompressParams& jparams,
+                               const DecompressParams& dparams,
+                               const std::vector<uint8_t>& compressed,
+                               std::vector<TestImage>* output_progression);
+// Returns the number of bytes read from compressed.
+size_t DecodeWithLibjpeg(const CompressParams& jparams,
+                         const DecompressParams& dparams,
+                         const uint8_t* table_stream, size_t table_stream_size,
+                         const uint8_t* compressed, size_t len,
+                         TestImage* output);
+void DecodeWithLibjpeg(const CompressParams& jparams,
+                       const DecompressParams& dparams,
+                       const std::vector<uint8_t>& compressed,
+                       TestImage* output);
+
+}  // namespace jpegli
+
+#endif  // LIB_JPEGLI_LIBJPEG_TEST_UTIL_H_