From: dblack@...
Date: 2003-09-15T21:56:48+09:00
Subject: Re: Test::Unit -- multiple errors in test method ???

Hi --

On Mon, 15 Sep 2003, Johan Holmberg wrote:

> - I have tried to write some table driven tests. How should I do
>   this ? Currently I tried something in the following style:
>
> 	...
> 	@@data = [
> 	    [2,  1, 1],
> 	    [5,  2, 2],     # should fail
> 	    [7,  2, 5],
> 	    [8,  3, 4],     # should fail
> 	]
>
> 	def test_b
> 	    for facit, aa, bb in @@data
> 		assert_equal facit, aa + bb
> 	    end
> 	end
> 	...
>
>   Here I have several tests that are not "increasing".
>   (just before I post this I saw David Alan Blacks answer mentioning
>    Test::Unit::AssertionFailedError. Should I catch that ? )

You could turn the whole thing on its head, so to speak:

  require 'test/unit'

  class TestMe < Test::Unit::TestCase
    def setup
      @@data = [
		[2,  1, 1],
		[5,  2, 2],     # should fail
		[7,  2, 5],
		[8,  3, 4],     # should fail
	       ]
    end

    def test_addition
      wrong = @@data.find_all {|d| d[0] != d[1] + d[2]}
      assert(wrong.empty?, "These failed: #{wrong.inspect}")
    end
  end

(give or take some granularity in the error-reporting, etc.)


David

-- 
David Alan Black
home: dblack@superlink.net
work: blackdav@shu.edu
Web:  http://pirate.shu.edu/~blackdav