exiv2/unitTests/test_FileIo.cpp

// ***************************************************************** -*- C++ -*-
/*
 * Copyright (C) 2004-2021 Exiv2 authors
 * This program is part of the Exiv2 distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, 5th Floor, Boston, MA 02110-1301 USA.
 */

#include "basicio.hpp"
#include <gtest/gtest.h>
using namespace Exiv2;

namespace
{
    const std::string testData(TESTDATA_PATH);
    const std::string imagePath(testData + "/DSC_3079.jpg");
    const std::string nonExistingImagePath(testData + "/nonExisting.jpg");
}  // namespace

TEST(AFileIO, canBeInstantiatedWithFilePath)
{
    ASSERT_NO_THROW(FileIo file(imagePath));
}

TEST(AFileIO, canBeOpenInReadBinaryMode)
{
    FileIo file(imagePath);
    ASSERT_EQ(0, file.open());
}

TEST(AFileIO, isOpenDoItsJob)
{
    FileIo file(imagePath);
    ASSERT_FALSE(file.isopen());
    ASSERT_EQ(0, file.open());
    ASSERT_TRUE(file.isopen());
}

TEST(AFileIO, failsToOpenANonExistingFile)
{
    FileIo file(nonExistingImagePath);
    ASSERT_FALSE(file.isopen());
    ASSERT_EQ(1, file.open());
    ASSERT_FALSE(file.isopen());
}

TEST(AFileIO, canChangeItsPathWithSetPath)
{
    FileIo file(nonExistingImagePath);
    ASSERT_EQ(nonExistingImagePath, file.path());
    file.setPath(imagePath);
    ASSERT_EQ(imagePath, file.path());
}


TEST(AFileIO, returnsFileSizeIfItsOpened)
{
    FileIo file(imagePath);
    file.open();
    ASSERT_EQ(118685UL, file.size());
}

TEST(AFileIO, returnsFileSizeEvenWhenFileItIsNotOpened)
{
    FileIo file(imagePath);
    ASSERT_EQ(118685UL, file.size());
}

TEST(AFileIO, isOpenedAtPosition0)
{
    FileIo file(imagePath);
    file.open();
    ASSERT_EQ(0, file.tell());
}

TEST(AFileIO, canSeekToExistingPositions)
{
    FileIo file(imagePath);
    file.open();

    ASSERT_EQ(0, file.seek(100, BasicIo::beg));
    ASSERT_EQ(0, file.seek(-50, BasicIo::cur));
    ASSERT_EQ(0, file.seek(-50, BasicIo::end));

    ASSERT_FALSE(file.error());
    ASSERT_FALSE(file.eof());
}

TEST(AFileIO, canSeekBeyondEOF)
{
    FileIo file(imagePath);
    file.open();

    // POSIX allows seeking beyond the existing end of file.
    ASSERT_EQ(0, file.seek(200000, BasicIo::beg));
    ASSERT_FALSE(file.error());
    ASSERT_FALSE(file.eof());
}