test_zero = ->
  run_test [
    "zero(2,2)",
    "[[0,0],[0,0]]",

    "zero(1,1)",
    "[[0]]",

    "zero(1)",
    "[0]",

    "zero(2)",
    "[0,0]",

    "zero(1,2)",
    "[[0,0]]",

    "zero(2,1)",
    "[[0],[0]]",

    "zero(0)",
    "0",

    "zero(0,0)",
    "0",

    # it's relevant to handle the case of tensor
    # being passed because if you type
    #  2
    #  zero
    #  > (0,0)
    #  zero # now the last result is passed to zero
    #  > 0 # (0,0) being passed, but it's handled!
    # before some adjustments this used to crash.
    # And it happened to me, so it can happen.
    "zero([2,3])",
    "0",

  ]