Comment # 2 on bug 932331 from Martin Vidner

(For the record, the current position of aschnell/master is
https://github.com/aschnell/yast-snapper/tree/d27bd89fd6ce11d904f16f32f01d18d723e6793d
>From there, remove the n option on src/modules/SnapperDbus.rb:48)

The problem is that the yast component system eats the original exception:

$ rspec test/*test.rb
or
$ rspec --backtrace test/*test.rb

don't show it, but ~/.y2log does:

2015-05-27 15:14:37 <3> mrakoplas.suse.cz(7869) [Y2Ruby]
binary/Y2RubyUtils.cc(y2_require):25 cannot require
yast:/local/home-mvidner/svn/yast/snapper/src/modules/SnapperDbus.rb:51:
invalid multibyte escape: /(\\|[\x80-\xff])/ at
/usr/lib64/ruby/vendor_ruby/2.1.0/yast/yast.rb:162:in `import_pure'
2015-05-27 15:14:37 <3> mrakoplas.suse.cz(7869) [Interpreter] yast/i18n.rb:133
Ruby::loadModule() / Can't load ruby module
'/local/home-mvidner/svn/yast/snapper/src/modules/SnapperDbus'
2015-05-27 15:14:37 <5> mrakoplas.suse.cz(7869) [Y2Ruby]
binary/YRubyNamespace.cc(YRubyNamespace):219 The Ruby module 'SnapperDbus' is
not provided by its rb file
2015-05-27 15:14:37 <3> mrakoplas.suse.cz(7869) [Interpreter] yast/i18n.rb:133
No table associated to module 'SnapperDbus'
2015-05-27 15:14:37 <3> mrakoplas.suse.cz(7869) [Ruby] binary/Yast.cc(getNs):64
ruby call: Can't import namespace 'SnapperDbus'
2015-05-27 15:14:37 <3> mrakoplas.suse.cz(7869) [Y2Ruby]
binary/Y2RubyUtils.cc(y2_require):25 cannot require yast:component cannot
import namespace 'SnapperDbus' at
/usr/lib64/ruby/vendor_ruby/2.1.0/yast/yast.rb:162:in `import_pure'
2015-05-27 15:14:37 <3> mrakoplas.suse.cz(7869) [Interpreter] yast/i18n.rb:133
Ruby::loadModule() / Can't load ruby module
'/local/home-mvidner/svn/yast/snapper/src/modules/Snapper'
2015-05-27 15:14:37 <1> mrakoplas.suse.cz(7869) [Y2Ruby]
binary/YRuby.cc(~YRuby):107 Shutting down ruby interpreter.

The problem is a combination of several problems. Compare:

$ ruby -I src/modules/ -r SnapperDbus -e 1
/usr/lib64/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require':
/local/home-mvidner/svn/yast/snapper/src/modules/SnapperDbus.rb:51: invalid
multibyte escape: /(\\|[\x80-\xff])/ (SyntaxError)
        from /usr/lib64/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in
`require'

$ $ ruby -I src/modules/ -r yast -e 'Yast.import "SnapperDbus"'
/usr/lib64/ruby/vendor_ruby/2.1.0/yast/yast.rb:162:in `import_pure': component
cannot import namespace 'SnapperDbus' (NameError)
        from /usr/lib64/ruby/vendor_ruby/2.1.0/yast/yast.rb:162:in `import'
        from -e:1:in `<main>'
[actual exception in y2log]

$ ruby -I src/modules/ -r yast -e 'Yast.import "Snapper"'
[no error! but it has failed like you reported]