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diff --git a/third_party/jpeg-xl/lib/jxl/preview_test.cc b/third_party/jpeg-xl/lib/jxl/preview_test.cc
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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.
+
+#include <jxl/cms.h>
+
+#include <cstddef>
+#include <cstdint>
+#include <string>
+#include <vector>
+
+#include "lib/extras/codec.h"
+#include "lib/jxl/base/span.h"
+#include "lib/jxl/codec_in_out.h"
+#include "lib/jxl/enc_butteraugli_comparator.h"
+#include "lib/jxl/enc_params.h"
+#include "lib/jxl/headers.h"
+#include "lib/jxl/image_bundle.h"
+#include "lib/jxl/test_utils.h"
+#include "lib/jxl/testing.h"
+
+namespace jxl {
+namespace {
+using test::ReadTestData;
+using test::Roundtrip;
+
+TEST(PreviewTest, RoundtripGivenPreview) {
+ const std::vector<uint8_t> orig =
+ ReadTestData("external/wesaturate/500px/u76c0g_bliznaca_srgb8.png");
+ CodecInOut io;
+ ASSERT_TRUE(SetFromBytes(Bytes(orig), &io));
+ io.ShrinkTo(io.xsize() / 8, io.ysize() / 8);
+ // Same as main image
+ io.preview_frame = io.Main().Copy();
+ const size_t preview_xsize = 15;
+ const size_t preview_ysize = 27;
+ io.preview_frame.ShrinkTo(preview_xsize, preview_ysize);
+ io.metadata.m.have_preview = true;
+ ASSERT_TRUE(io.metadata.m.preview_size.Set(io.preview_frame.xsize(),
+ io.preview_frame.ysize()));
+
+ CompressParams cparams;
+ cparams.butteraugli_distance = 2.0;
+ cparams.speed_tier = SpeedTier::kSquirrel;
+ cparams.SetCms(*JxlGetDefaultCms());
+
+ CodecInOut io2;
+ JXL_EXPECT_OK(Roundtrip(&io, cparams, {}, &io2, _));
+ EXPECT_EQ(preview_xsize, io2.metadata.m.preview_size.xsize());
+ EXPECT_EQ(preview_ysize, io2.metadata.m.preview_size.ysize());
+ EXPECT_EQ(preview_xsize, io2.preview_frame.xsize());
+ EXPECT_EQ(preview_ysize, io2.preview_frame.ysize());
+
+ EXPECT_LE(ButteraugliDistance(io.preview_frame, io2.preview_frame,
+ ButteraugliParams(), *JxlGetDefaultCms(),
+ /*distmap=*/nullptr),
+ 2.5);
+ EXPECT_LE(ButteraugliDistance(io.Main(), io2.Main(), ButteraugliParams(),
+ *JxlGetDefaultCms(),
+ /*distmap=*/nullptr),
+ 2.5);
+}
+
+} // namespace
+} // namespace jxl