Why is sentry's test fixtures nil?

I tried sentry plugin's test. It occured error with below message.

I found the reason why fixtures had not been initialized.
The fixtures is initialized by
Test::Unit::TestCase#setup_with_fixtures, it is aliased :setup,
which is required that ActiveRecord::Base.configurations is not nil

I added code to set ActiveRecord::Base.configurations below code.

-- abstract_unit.rb 2007-11-23 14:00:26.000000000 +0900
+++ abstract_unit.new 2007-11-23 14:04:40.000000000 +0900
@@ -12,6 +12,7 @@

config = YAML::load(IO.read(config_location))
ActiveRecord::Base.logger = Logger.new(File.dirname(__FILE__) + "/
debug.log")
+ActiveRecord::Base.configurations=config
ActiveRecord::Base.establish_connection(config[ENV['DB'] ||
'sqlite'])

load(File.dirname(__FILE__) + "/schema.rb")