From: Daniel Berger <djberg96@...>
Date: 2005-11-09T12:07:12+09:00
Subject: Re: Testing array.push(array)

Eric Hodel wrote:
> On Nov 8, 2005, at 6:42 PM, Daniel Berger wrote:
>
> > Hi all,
> >
> > I recently tried to write an assertion like so:
> >
> > def test_array_infinity
> >    array = [1,2,3]
> >    assert_equal([1,2,3,"[...]"], array.push(array))
> > end
> >
> > But, it appears that "[...]" is not a literal string.  However, I
> > can't
> > just remove the quotes, because then I get a syntax error.
> >
> > How do I test this case?
>
> I don't think you can do it so easily:
>
> irb(main):001:0> expected = [1, 2, 3]
> => [1, 2, 3]
> irb(main):002:0> expected << expected
> => [1, 2, 3, [...]]
> irb(main):003:0> array = [1,2,3]
> => [1, 2, 3]
> irb(main):004:0> array.push array
> => [1, 2, 3, [...]]
> irb(main):005:0> array == expected
> SystemStackError: stack level too deep
>          from (irb):5:in `=='
>          from (irb):5
>          from :0
>
> Try:
>
> irb(main):007:0> array[0] == expected[0]
> => true
> irb(main):008:0> array[1] == expected[1]
> => true
> irb(main):009:0> array[2] == expected[2]
> => true
> irb(main):011:0> array[3] == array
> => true

Ah, that will work fine, thanks.

Dan