test_isprime = ->
  run_test [
    # 0 and 1 are not prime numbers

    "isprime(0)",
    "0",

    "isprime(1)",
    "0",

    "isprime(13)",
    "1",

    "isprime(14)",
    "0",

    # from the Prime Curios web page

    "isprime(9007199254740991)",
    "0",

    # The largest prime that JavaScript supports

    "isprime(2^53 - 111)",
    "1",

    # misc. primes

    "isprime(2^50-71)",
    "1",

    "isprime(2^40-87)",
    "1",

  ]