[ruby-core:65936] [ruby-trunk - Bug #10430] Proc instead of String as error message doesn't work.

Issue #10430 has been updated by Martin Dürst.


Nobuyoshi Nakada wrote:
> Because the discussion about standard test libraries has not landed yet.
> Sutou-san said he will fix so that user_message can be a Proc.
> http://twitter.com/ktou/status/526751637990150144

Ah, thanks a lot for following up on this. This is great.
Sutou-san, 是非よろしくお願いします。




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Bug #10430: Proc instead of String as error message doesn't work.
https://bugs.ruby-lang.org/issues/10430#change-49671

* Author: Martin Dürst
* Status: Closed
* Priority: Normal
* Assignee: Nobuyoshi Nakada
* Category: test
* Target version: current: 2.2.0
* ruby -v: ruby 2.2.0dev (2014-10-26 trunk 48146) [x86_64-cygwin]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN
----------------------------------------
Revision r48113 introduced Procs to delay time-consuming generation of error messages. This is a good idea, but it doesn't work for me.

How to reproduce: Make a small change in lib/unicode_normalize/tables.rb. Any change should do; I changed "Q" to "QQ" in one instance. Run make install(-nodoc). Run ruby test/test_unicode_normalize.rb.

The result I get is as follows:

~~~
===============================================================================
Failure:
test_normalize_to_NFKD_from_source_with_nfkd(TestNormalize)
test/test_unicode_normalize.rb:38:in `block (2 levels) in generate_test_normalize'
test/test_unicode_normalize.rb:33:in `each'
test/test_unicode_normalize.rb:33:in `block in generate_test_normalize'
#<Proc:0x000006033229f0@test/test_unicode_normalize.rb:32>
<"Q"> expected but was
<"QQ">

diff:
? QQ
===============================================================================
~~~

The failure is expected (artificially generated). The problem is the line
`#<Proc:0x000006033229f0@test/test_unicode_normalize.rb:32>`
The Proc that is supposed to be evaluated to generate a more detailed error message (showing codepoints of the characters involved) is just converted to a String.

For reference, I'm using the standard bundled gems  minitest-5.4.1.gem, power_assert-0.1.4.gem, and test-unit-3.0.1.gem.




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