formats/png/crc_test.cc

// Copyright 2026 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

#include "formats/png/crc.h"

#include "gmock/gmock.h"
#include "gtest/gtest.h"

namespace credentio {
namespace {

using ::testing::Eq;

TEST(PngChunkCrcTest, ComputesCrcCorrectly) {
  EXPECT_THAT(PngChunkCrc("abcd", "data1"), Eq(0x870ce600));
  EXPECT_THAT(PngChunkCrc("dcba", "data1"), Eq(0xf78b39d6));
  EXPECT_THAT(PngChunkCrc("dcba", "data2"), Eq(0x6e82686c));
  EXPECT_THAT(PngChunkCrc("IDAT", "more data"), Eq(0x6b6f3927));
  EXPECT_THAT(PngChunkCrc("IEND", ""), Eq(0xae426082));
}

}  // namespace
}  // namespace credentio