I am reading http://sequel.rubyforge.org/rdoc/files/doc/testing_rdoc.html. Under "Environment variables" section, I read "See that file for details. It may be necessary to use spec_config.rb as opposed to an environment variable if you database connection cannot be specified by a connection string." and found that "you database connection" should be "your database connection".
Thanks, I'll fix this soon.
Fix typo in testing doc (Fixes #438)