circularbuffer_unittest.cpp

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/* +------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)            |
   |                          https://www.mrpt.org/                         |
   |                                                                        |
   | Copyright (c) 2005-2019, Individual contributors, see AUTHORS file     |
   | See: https://www.mrpt.org/Authors - All rights reserved.               |
   | Released under BSD License. See: https://www.mrpt.org/License          |
   +------------------------------------------------------------------------+ */

#include <CTraitsTest.h>
#include <mrpt/containers/circular_buffer.h>
#include <mrpt/core/common.h>
#include <mrpt/random.h>

#include <gtest/gtest.h>

template class mrpt::CTraitsTest<mrpt::containers::circular_buffer<char>>;

using cb_t = int;

TEST(circular_buffer_tests, EmptyPop)
{
    mrpt::containers::circular_buffer<cb_t> cb(10);
    cb_t ret;
    EXPECT_THROW(cb.pop(ret), std::exception);
}
TEST(circular_buffer_tests, EmptyPopAfterPushes)
{
    const size_t LEN = 20;
    mrpt::containers::circular_buffer<cb_t> cb(LEN);
    for (size_t nWr = 0; nWr < LEN; nWr++)
    {
        for (size_t i = 0; i < nWr; i++) cb.push(12);
        cb_t ret;
        for (size_t i = 0; i < nWr; i++) cb.pop(ret);
        // The next one must fail:
        EXPECT_THROW(cb.pop(ret), std::exception);
    }
}

TEST(circular_buffer_tests, RandomWriteAndPeek)
{
    const size_t LEN = 20;
    mrpt::containers::circular_buffer<cb_t> cb(LEN);

    for (size_t iter = 0; iter < 1000; iter++)
    {
        const size_t nWr =
            mrpt::random::getRandomGenerator().drawUniform32bit() % LEN;
        for (size_t i = 0; i < nWr; i++) cb.push(i);
        cb_t ret;
        for (size_t i = 0; i < nWr; i++)
        {
            ret = cb.peek(i);
            EXPECT_EQ(ret, cb_t(i));
        }
        for (size_t i = 0; i < nWr; i++)
        {
            cb.pop(ret);
            EXPECT_EQ(ret, cb_t(i));
        }
    }
}
TEST(circular_buffer_tests, RandomWriteManyAndPeek)
{
    const size_t LEN = 20;
    mrpt::containers::circular_buffer<cb_t> cb(LEN);
    std::vector<cb_t> dum_buf;

    for (size_t iter = 0; iter < 1000; iter++)
    {
        const size_t nWr =
            1 +
            mrpt::random::getRandomGenerator().drawUniform32bit() % (LEN - 1);
        dum_buf.resize(nWr);
        cb.push_many(&dum_buf[0], nWr);
        cb_t ret;
        if (iter % 2)
        {
            for (size_t i = 0; i < nWr; i++) ret = cb.peek(i);
            MRPT_UNUSED_PARAM(ret);
        }
        else
        {
            cb.peek_many(&dum_buf[0], nWr);
        }
        if (iter % 3)
        {
            for (size_t i = 0; i < nWr; i++) cb.pop(ret);
            MRPT_UNUSED_PARAM(ret);
        }
        else
        {
            cb.pop_many(&dum_buf[0], nWr);
        }
    }
}
TEST(circular_buffer_tests, RandomWriteAndPeekOverrun)
{
    const size_t LEN = 20;
    mrpt::containers::circular_buffer<cb_t> cb(LEN);

    for (size_t iter = 0; iter < 100; iter++)
    {
        const size_t nWr =
            mrpt::random::getRandomGenerator().drawUniform32bit() % LEN;
        for (size_t i = 0; i < nWr; i++) cb.push(i);
        cb_t ret;
        for (unsigned k = 0; k < 5; k++)
        {
            try
            {
                ret = cb.peek(nWr + k);
                GTEST_FAIL() << "Exception was expected but didn't happen!";
            }
            catch (std::exception&)
            {
                // OK
            }
        }
        for (size_t i = 0; i < nWr; i++) cb.pop(ret);
    }
}

TEST(circular_buffer_tests, Size)
{
    mrpt::containers::circular_buffer<cb_t> cb(10);
    for (size_t i = 0; i < cb.capacity() - 1; i++)
    {
        cb.push(0);
        EXPECT_EQ(cb.size(), i + 1);
    }
    EXPECT_ANY_THROW(cb.push(0));
    for (size_t i = 0; i < cb.capacity() - 1; i++)
    {
        cb.pop();
        EXPECT_EQ(cb.size(), cb.capacity() - 2 - i);
    }
}