# File lib/test/unit/fixture.rb, line 5 def included(base) base.extend(ClassMethods) [:setup, :cleanup, :teardown].each do |fixture| observer = lambda do |test_case, _, _, value, callback| if value.nil? test_case.send("unregister_#{fixture}_callback", callback) else test_case.send("register_#{fixture}_callback", callback, value) end end base.register_attribute_observer(fixture, &observer) end end