using Base.Test
using MPI

MPI.Init()

function gatherv_array(A, counts::Vector{Cint}, root)
    comm = MPI.COMM_WORLD
    B = MPI.Gatherv(A, counts, root, comm)
end

function igatherv_array(A, counts::Vector{Cint}, root)
    comm = MPI.COMM_WORLD
    req, B = MPI.Igatherv(A, counts, root, comm)
    MPI.Wait!(req)
    B
end

comm = MPI.COMM_WORLD
size = MPI.Comm_size(comm)
rank = MPI.Comm_rank(comm)
root = 0

# Defining this to make ones work for Char
Base.one(::Type{Char}) = '\01'

for typ in MPI.MPIDatatype.types

    A = ones(typ, mod(rank,2) + 1)
    counts = Cint[ mod(i,2) + 1 for i in 0:(size-1)]
    B = gatherv_array(A, counts, root)
    if rank == root
        @test B == ones(typ, 3 * div(size,2) + mod(size,2))
    end
    A = ones(typ, mod(rank,2) + 1)
    counts = Cint[ mod(i,2) + 1 for i in 0:(size-1)]
    B = igatherv_array(A, counts, root)
    if rank == root
        @test B == ones(typ, 3 * div(size,2) + mod(size,2))
    end
end

MPI.Finalize()