context("hungarianAlgorithm")

test_that("HungarianAlgorithm provides the correct answer on various inputs",
{
  for (n in c(2,3,10,50))
  {
    for (repetition in 1:3)
    {
      # Generate a random vector, and permute it:
      # we expect the algorithm to retrieve the permutation
      v <- runif(n, min=-1, max=1)
      permutation <- sample(1:n)
      v_p <- v[permutation]

      # v is reference, v_p is v after permutation
      # distances[i,j] = distance between i-th component of v
      # and j-th component of v_p
      # "in rows : reference; in columns: after permutation"
      # "permutation" contains order on v to match v_p as closely as possible
      distances <- sapply(v_p, function(elt) ( abs(elt - v) ) )
      assignment <- .hungarianAlgorithm(distances)
      expect_equal(assignment, permutation)
    }
  }
})