atomicio.test.cc

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#include <gtest/gtest.h>
#include <unistd.h>

#include <string>

#include "base/atomicio.hh"

/*
 * This will test reading from a file with a buffer capable of storing the
 * entirity of the file.
 */
TEST(AtomicioTest, AtomicReadBigBuffer)
{
    FILE* file;
    file = tmpfile();

    std::string file_contents = "This is just some test data to ensure that we"
                                " can read correctly from a file.";

    fputs(file_contents.c_str(), file);
    fflush(file);
    rewind(file);

    char s[1000];

    ssize_t size = atomic_read(fileno(file), s, 1000);
    fclose(file);

    EXPECT_EQ(file_contents.size(), size);
    for (unsigned int i = 0; i < size; i++) {
        EXPECT_EQ(file_contents[i], s[i]);
    }
}

/*
 * This will test reading from a file using a buffer smaller than the file
 * contents. The buffer should be filled and the remainder left unread.
 */
TEST(AtomicioTest, AtomicReadSmallBuffer)
{
    FILE* file;
    file = tmpfile();

    std::string file_contents = "This is just some test data to ensure that we"
                                " can read correctly from a file.";

    fputs(file_contents.c_str(), file);
    fflush(file);
    rewind(file);

    char s[10];

    ssize_t size = atomic_read(fileno(file), s, 10);
    fclose(file);

    EXPECT_EQ(10, size);
    for (unsigned int i = 0; i < size; i++) {
        EXPECT_EQ(file_contents[i], s[i]);
    }
}

/*
 * This tests writing a string to a file via the atomic_write function.
 */
TEST(AtomicioTest, AtomicWrite)
{
    FILE* file;
    file = tmpfile();

    std::string file_contents = "This is just some test data to ensure that we"
                                " can write correctly to a file.";

    ssize_t size = atomic_write(fileno(file),
                                file_contents.c_str(),
                                file_contents.size());
    fflush(file);
    rewind(file);

    EXPECT_EQ(file_contents.size(), size);

    int c;
    for (unsigned int i = 0; (c = fgetc(file)) != EOF; i++) {
        EXPECT_EQ(file_contents[i], (unsigned char)c);
    }

    fclose(file);
}