Testing array.push(array)

ruby-talk
1

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?

Thanks,

Dan

2

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

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

···

On Nov 8, 2005, at 6:42 PM, Daniel Berger wrote:
         from :0

--
Eric Hodel - drbrain@segment7.net - http://segment7.net
FEC2 57F1 D465 EB15 5D6E 7C11 332A 551C 796C 9F04

3

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