errno_saver_test.cc

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// Copyright 2018 The Abseil Authors.

//

// 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 "absl/base/internal/errno_saver.h"

#include <cerrno>

#include "gmock/gmock.h"

#include "gtest/gtest.h"

#include "absl/base/internal/strerror.h"

namespace {

using ::testing::Eq;

struct ErrnoPrinter {

  int no;

};

std::ostream &operator<<(std::ostream &os, ErrnoPrinter ep) {

  return os << absl::base_internal::StrError(ep.no) << " [" << ep.no << "]";

bool operator==(ErrnoPrinter one, ErrnoPrinter two) { return one.no == two.no; }

TEST(ErrnoSaverTest, Works) {

  errno = EDOM;

    absl::base_internal::ErrnoSaver errno_saver;

    EXPECT_THAT(ErrnoPrinter{errno}, Eq(ErrnoPrinter{EDOM}));

    errno = ERANGE;

    EXPECT_THAT(ErrnoPrinter{errno}, Eq(ErrnoPrinter{ERANGE}));

    EXPECT_THAT(ErrnoPrinter{errno_saver()}, Eq(ErrnoPrinter{EDOM}));

  EXPECT_THAT(ErrnoPrinter{errno}, Eq(ErrnoPrinter{EDOM}));

}  // namespace