[DRE-maint] Bug#889157: ruby-validates-hostname FTBFS with Ruby 2.5

[Adrian Bunk]

Source: ruby-validates-hostname
Version: 1.0.7-1
Severity: serious

https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/ruby-validates-hostname.html

...
┌──────────────────────────────────────────────────────────────────────────────┐
│ Run tests for ruby2.5 from debian/ruby-tests.rake                            │
└──────────────────────────────────────────────────────────────────────────────┘

RUBYLIB=/build/1st/ruby-validates-hostname-1.0.7/debian/ruby-validates-hostname/usr/lib/ruby/vendor_ruby:. GEM_PATH=debian/ruby-validates-hostname/usr/share/rubygems-integration/all:/var/lib/gems/2.5.0:/usr/lib/x86_64-linux-gnu/rubygems-integration/2.5.0:/usr/share/rubygems-integration/2.5.0:/usr/share/rubygems-integration/all ruby2.5 -S rake -f debian/ruby-tests.rake
/usr/bin/ruby2.5 /usr/bin/rspec --pattern ./spec/\*\*/\*_spec.rb --format documentation
/usr/lib/ruby/vendor_ruby/sprockets/digest_utils.rb:47: warning: constant ::Fixnum is deprecated
/usr/lib/ruby/vendor_ruby/sprockets/digest_utils.rb:51: warning: constant ::Bignum is deprecated
/usr/lib/ruby/vendor_ruby/sprockets/processor_utils.rb:110: warning: constant ::Fixnum is deprecated
/usr/lib/ruby/vendor_ruby/sprockets/processor_utils.rb:111: warning: constant ::Bignum is deprecated
/usr/lib/ruby/vendor_ruby/thread_safe/cache.rb:155: warning: constant ::Fixnum is deprecated
/usr/lib/ruby/vendor_ruby/thread_safe/cache.rb:155: warning: constant ::Fixnum is deprecated
/usr/lib/ruby/vendor_ruby/active_record/connection_adapters/connection_specification.rb:177:in `rescue in spec': Specified 'sqlite3' for database adapter, but the gem is not loaded. Add `gem 'sqlite3'` to your Gemfile (and ensure its version is at the minimum required by ActiveRecord). (Gem::LoadError)
	from /usr/lib/ruby/vendor_ruby/active_record/connection_adapters/connection_specification.rb:174:in `spec'
	from /usr/lib/ruby/vendor_ruby/active_record/connection_handling.rb:50:in `establish_connection'
	from /build/1st/ruby-validates-hostname-1.0.7/spec/validates_hostname_spec.rb:3:in `<top (required)>'
	from /usr/lib/ruby/vendor_ruby/rspec/core/configuration.rb:1435:in `load'
	from /usr/lib/ruby/vendor_ruby/rspec/core/configuration.rb:1435:in `block in load_spec_files'
	from /usr/lib/ruby/vendor_ruby/rspec/core/configuration.rb:1433:in `each'
	from /usr/lib/ruby/vendor_ruby/rspec/core/configuration.rb:1433:in `load_spec_files'
	from /usr/lib/ruby/vendor_ruby/rspec/core/runner.rb:100:in `setup'
	from /usr/lib/ruby/vendor_ruby/rspec/core/runner.rb:86:in `run'
	from /usr/lib/ruby/vendor_ruby/rspec/core/runner.rb:71:in `run'
	from /usr/lib/ruby/vendor_ruby/rspec/core/runner.rb:45:in `invoke'
	from /usr/bin/rspec:4:in `<main>'
/usr/bin/ruby2.5 /usr/bin/rspec --pattern ./spec/\*\*/\*_spec.rb --format documentation failed
ERROR: Test "ruby2.5" failed. Exiting.
dh_auto_install: dh_ruby --install /build/1st/ruby-validates-hostname-1.0.7/debian/ruby-validates-hostname returned exit code 1
debian/rules:6: recipe for target 'binary' failed
make: *** [binary] Error 1