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/*! \internal \file
 * \brief Testing gmx::accessor_policy.
 *
 * \author Christian Blau <cblau@gwdg.de>
 */
#include "gmxpre.h"

#include "gromacs/mdspan/accessor_policy.h"

#include <array>

#include <gtest/gtest.h>

namespace gmx
{

class BasicAccessorPolicy : public ::testing::Test
{
public:
    std::array<float, 3>  testdata = { { 1., 2., 3. } };
    accessor_basic<float> acc;
};

TEST_F(BasicAccessorPolicy, Decay)
{
    EXPECT_EQ(acc.decay(testdata.data()), testdata.data());
}

TEST_F(BasicAccessorPolicy, Access)
{
    for (size_t i = 0; i < testdata.size(); ++i)
    {
        EXPECT_EQ(acc.access(testdata.data(), i), testdata[i]);
    }
}

TEST_F(BasicAccessorPolicy, Offset)
{
    for (size_t i = 0; i < testdata.size(); ++i)
    {
        EXPECT_EQ(acc.offset(testdata.data(), i), testdata.data() + i);
    }
}

TEST_F(BasicAccessorPolicy, CopyAccessor)
{
    const auto newAcc = acc;

    EXPECT_EQ(acc.decay(testdata.data()), newAcc.decay(testdata.data()));
    for (size_t i = 0; i < testdata.size(); ++i)
    {
        EXPECT_EQ(acc.access(testdata.data(), i), newAcc.access(testdata.data(), i));
    }

    for (size_t i = 0; i < testdata.size(); ++i)
    {
        EXPECT_EQ(acc.offset(testdata.data(), i), newAcc.offset(testdata.data(), i));
    }
}

} // namespace gmx
