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diff --git a/lib/jpegli/test_utils.h b/lib/jpegli/test_utils.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_TEST_UTILS_H_
+#define LIB_JPEGLI_TEST_UTILS_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include <algorithm>
+#include <string>
+#include <vector>
+
+/* clang-format off */
+#include <stdio.h>
+#include <jpeglib.h>
+#include <setjmp.h>
+/* clang-format on */
+
+#include "lib/jpegli/common.h"
+#include "lib/jpegli/libjpeg_test_util.h"
+#include "lib/jpegli/test_params.h"
+
+namespace jpegli {
+
+#define ERROR_HANDLER_SETUP(flavor)                                \
+  jpeg_error_mgr jerr;                                             \
+  jmp_buf env;                                                     \
+  cinfo.err = flavor##_std_error(&jerr);                           \
+  if (setjmp(env)) {                                               \
+    return false;                                                  \
+  }                                                                \
+  cinfo.client_data = reinterpret_cast<void*>(&env);               \
+  cinfo.err->error_exit = [](j_common_ptr cinfo) {                 \
+    (*cinfo->err->output_message)(cinfo);                          \
+    jmp_buf* env = reinterpret_cast<jmp_buf*>(cinfo->client_data); \
+    flavor##_destroy(cinfo);                                       \
+    longjmp(*env, 1);                                              \
+  };
+
+std::string IOMethodName(JpegliDataType data_type, JpegliEndianness endianness);
+
+std::string ColorSpaceName(J_COLOR_SPACE colorspace);
+
+std::ostream& operator<<(std::ostream& os, const TestImage& input);
+
+std::ostream& operator<<(std::ostream& os, const CompressParams& jparams);
+
+int NumTestScanScripts();
+
+void VerifyHeader(const CompressParams& jparams, j_decompress_ptr cinfo);
+void VerifyScanHeader(const CompressParams& jparams, j_decompress_ptr cinfo);
+
+void SetDecompressParams(const DecompressParams& dparams,
+                         j_decompress_ptr cinfo);
+
+void SetScanDecompressParams(const DecompressParams& dparams,
+                             j_decompress_ptr cinfo, int scan_number);
+
+void CopyCoefficients(j_decompress_ptr cinfo, jvirt_barray_ptr* coef_arrays,
+                      TestImage* output);
+
+void UnmapColors(uint8_t* row, size_t xsize, int components,
+                 JSAMPARRAY colormap, size_t num_colors);
+
+std::string GetTestDataPath(const std::string& filename);
+std::vector<uint8_t> ReadTestData(const std::string& filename);
+
+class PNMParser {
+ public:
+  explicit PNMParser(const uint8_t* data, const size_t len)
+      : pos_(data), end_(data + len) {}
+
+  // Sets "pos" to the first non-header byte/pixel on success.
+  bool ParseHeader(const uint8_t** pos, size_t* xsize, size_t* ysize,
+                   size_t* num_channels, size_t* bitdepth);
+
+ private:
+  static bool IsLineBreak(const uint8_t c) { return c == '\r' || c == '\n'; }
+  static bool IsWhitespace(const uint8_t c) {
+    return IsLineBreak(c) || c == '\t' || c == ' ';
+  }
+
+  bool ParseUnsigned(size_t* number);
+
+  bool SkipWhitespace();
+
+  const uint8_t* pos_;
+  const uint8_t* const end_;
+};
+
+bool ReadPNM(const std::vector<uint8_t>& data, size_t* xsize, size_t* ysize,
+             size_t* num_channels, size_t* bitdepth,
+             std::vector<uint8_t>* pixels);
+
+void SetNumChannels(J_COLOR_SPACE colorspace, size_t* channels);
+
+void ConvertToGrayscale(TestImage* img);
+
+void GeneratePixels(TestImage* img);
+
+void GenerateRawData(const CompressParams& jparams, TestImage* img);
+
+void GenerateCoeffs(const CompressParams& jparams, TestImage* img);
+
+void EncodeWithJpegli(const TestImage& input, const CompressParams& jparams,
+                      j_compress_ptr cinfo);
+
+bool EncodeWithJpegli(const TestImage& input, const CompressParams& jparams,
+                      std::vector<uint8_t>* compressed);
+
+double DistanceRms(const TestImage& input, const TestImage& output,
+                   size_t start_line, size_t num_lines,
+                   double* max_diff = nullptr);
+
+double DistanceRms(const TestImage& input, const TestImage& output,
+                   double* max_diff = nullptr);
+
+void VerifyOutputImage(const TestImage& input, const TestImage& output,
+                       size_t start_line, size_t num_lines, double max_rms,
+                       double max_diff = 255.0);
+
+void VerifyOutputImage(const TestImage& input, const TestImage& output,
+                       double max_rms, double max_diff = 255.0);
+
+}  // namespace jpegli
+
+#endif  // LIB_JPEGLI_TEST_UTILS_H_