[DRE-maint] Bug#996221: ruby-ethon: FTBFS with ruby3.0: ERROR: Test "ruby3.0" failed: Failure/Error: require 'rack/handler/webrick'

[Antonio Terceiro]

Source: ruby-ethon
Version: 0.9.0-2
Severity: serious
Justification: FTBFS
Tags: bookworm sid ftbfs
User: debian-ruby at lists.debian.org
Usertags: ruby3.0

Hi,

We are about to enable building against ruby3.0 on unstable. During a test
rebuild, ruby-ethon was found to fail to build in that situation.

To reproduce this locally, you need to install ruby-all-dev from experimental
on an unstable system or build chroot.

Relevant part (hopefully):
> Failure/Error: require 'rack/handler/webrick'
> 
> LoadError:
>   cannot load such file -- webrick
> # ./spec/support/localhost_server.rb:2:in `<top (required)>'
> # ./spec/spec_helper.rb:10:in `require_relative'
> # ./spec/spec_helper.rb:10:in `<top (required)>'
> # ./spec/ethon/multi_spec.rb:1:in `<top (required)>'
> No examples found.
> 
> Finished in 0.00006 seconds (files took 0.76538 seconds to load)
> 0 examples, 0 failures, 29 errors occurred outside of examples
> 
> /usr/bin/ruby3.0 -I/usr/share/rubygems-integration/all/gems/rspec-support-3.9.3/lib:/usr/share/rubygems-integration/all/gems/rspec-core-3.9.2/lib /usr/share/rubygems-integration/all/gems/rspec-core-3.9.2/exe/rspec --pattern ./spec/\*\*/\*_spec.rb --format documentation failed
> ERROR: Test "ruby3.0" failed: 

Note that webrick has been removed from the standard library. It's
already been packaged and is currently in NEW, but this package now
needs an explicit dependency on it.

The full build log is available at
https://people.debian.org/~kanashiro/ruby3.0/round2/builds/3/ruby-ethon/ruby-ethon_0.9.0-2+rebuild1633379123_amd64.build.txt
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