# File test-unit-3.3.4/lib/test/unit/fixture.rb, line 5 def included(base) base.extend(ClassMethods) [:setup, :cleanup, :teardown].each do |type| observer = lambda do |test_case, _, _, value, callback| if value.nil? test_case.fixture[type].unregister(callback) else test_case.fixture[type].register(callback, value) end end base.register_attribute_observer(type, &observer) end end