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I develop Sinatra application and use there ActiveRecord for working with database, but I encountered one problem. I wrote a test for a model and it breaks with

SQLite3::CantOpenException: unable to open database file

Connection to database is established in test_helper.rb with the following code:

Dir.chdir('..') do
  ActiveRecord::Base.establish_connection(db_config)
end

and ActiveRecord::Base.connected? get false. If I call User.find(:all) for example after connection establishment test will pass and ActiveRecord::Base.connected? will be true. Why? I don't understand.