hash_test.pp

$tests = [
    undef, # this is NOT a hash
    'foobar', # this string is NOT a hash
    ### these are all the same as far as puppet is concerned
    #{a => b},      #
    #{"a" => "b"},  #
    {'a' => 'b'},  #
    ################
    #{:a => :b}, this is not parseable
    "{:a => :b}",# this is NOT a hash
    {1 => 2}, # this IS a hash!
    "{3 => 4}" # this IS NOT a hash!! a string.
    ]

hash_test { $tests: }

define hash_test ($test = $title) {
  if is_hash($test) {
    notify{"yes, ${test} is a hash.\n":}
  } else {
    notify {"no, ${test} is NOT a hash.\n":}
  }
}