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#include "catch2/catch_all.hpp"
#include "purify/mpi_utilities.h"
using namespace purify;
using Catch::Approx;
TEST_CASE("Distribution of visibility data") {
auto const world = sopt::mpi::Communicator::World();
auto const N = 5;
utilities::vis_params params;
params.u = Vector<t_real>::Random(N);
params.v = Vector<t_real>::Random(N);
params.w = Vector<t_real>::Random(N);
params.vis = Vector<t_complex>::Random(N);
params.weights = Vector<t_complex>::Random(N);
std::vector<t_int> order(N);
if (world.size() == 1) return;
order[0] = 1;
std::fill(order.begin() + 1, order.end(), 0);
auto actual = utilities::regroup_and_scatter(params, order, world);
if (world.rank() == 0) {
CHECK(actual.u.size() == 4);
CHECK(actual.u(0) == Approx(params.u(N - 1)));
CHECK(actual.u.tail(N - 2).isApprox(params.u.segment(1, N - 2)));
} else if (world.rank() == 1) {
CHECK(actual.u.size() == 1);
CHECK(actual.u(0) == Approx(params.u(0)));
} else
CHECK(actual.u.size() == 0);
}
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