I just run into the following error when running autotest within a Rails app:

/Users/jarkko/Sites/koulutusweb/vendor/rails/activerecord/lib/../../activesupport/lib/active_support/dependencies.rb:402:in `to_constant_name': Anonymous modules have no name to be referenced by (ArgumentError)
	from /Users/jarkko/Sites/koulutusweb/vendor/rails/activerecord/lib/../../activesupport/lib/active_support/dependencies.rb:214:in `qualified_name_for'
	from /Users/jarkko/Sites/koulutusweb/vendor/rails/activerecord/lib/../../activesupport/lib/active_support/dependencies.rb:477:in `const_missing'
	from /Users/jarkko/Sites/koulutusweb/vendor/plugins/rspec/lib/spec/example/example_group_factory.rb:7:in `reset'
	from /Users/jarkko/Sites/koulutusweb/vendor/plugins/rspec/lib/spec/example/example_group_factory.rb:59
	from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:27:in `gem_original_require'
	from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:27:in `require'
	from /Users/jarkko/Sites/koulutusweb/vendor/rails/activerecord/lib/../../activesupport/lib/active_support/dependencies.rb:496:in `require'
	from /Users/jarkko/Sites/koulutusweb/vendor/rails/activerecord/lib/../../activesupport/lib/active_support/dependencies.rb:342:in `new_constants_in'
	 ... 59 levels...
	from /Library/Ruby/Gems/1.8/gems/rspec-1.0.8/lib/spec/runner/command_line.rb:17:in `run'
	from /Library/Ruby/Gems/1.8/gems/rspec-1.0.8/bin/spec:3
	from /usr/bin/spec:19:in `load'
	from /usr/bin/spec:19

It turned out I had typed “sudo gem update zentest” to get the latest version of the gem. However, the correct way would have been to use the camel-cased version ZenTest. The funny thing is, that if you run the command in lower case (like I’m use to do with RubyGems), you will get ZenTest, it’s just version 3.5.0 (as opposed to 3.8 that I supposedly got).

So here’s hoping that the next time I do the same mistake, this page will pop up from the big G.