From: Eric Hodel <drbrain@...7.net>
Date: 2004-06-03T09:48:03-07:00
Subject: Re: Test::Unit: assert_follows_spec() (or something like that)

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David Garamond (lists@zara.6.isreserved.com) wrote:

> Eric Hodel wrote:
> >>The assert_follows_spec() could even perform several iterations of test=
s=20
> >>if wanted, to test deterministic-ness.
> >
> >If you've got a spec like this, why not write a method to autogenerate
> >test methods?
>=20
> Why is that better than something like assert_follows_spec()? It's not=20
> more readable IMO, it's not shorter, it adds an additional step in the=20
> Makefile/build process.

No additional steps.  Ruby does it for you:

require 'test/unit'

def my_meth(args)
  args.inject 0 do |acc, item|
    acc + item
  end
end

class MyTest < Test::Unit::TestCase

  SPEC_ONE =3D [[1, 1, 1], 3]
  SPEC_TWO =3D [[8, 1, 2], 11]
  SPEC_THREE =3D [[8, 3, 4], 15]
  SPEC_FOUR =3D [[4, 3, 2], 9]

  constants.each do |name|
    next unless name =3D~ /^SPEC_(.*)/

    eval "def test_#{$1.downcase}
      input =3D self.class.const_get(\"#{name}\")[0]
      output =3D self.class.const_get(\"#{name}\")[1]
      assert_equal output, my_meth(input)
    end"
  end
end


--=20
Eric Hodel - drbrain@segment7.net - http://segment7.net
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