Provides some helpers to deal with testing log subscribers by setting up notifications. Take for instance Active Record subscriber tests:
class SyncLogSubscriberTest < ActiveSupport::TestCase
include ActiveSupport::LogSubscriber::TestHelper
setup do
ActiveRecord::LogSubscriber.attach_to(:active_record)
end
def test_basic_query_logging
Developer.all.to_a
wait
assert_equal 1, @logger.logged(:debug).size
assert_match(/Developer Load/, @logger.logged(:debug).last)
assert_match(/SELECT \* FROM "developers"/, @logger.logged(:debug).last)
end
end
All you need to do is to ensure that your log subscriber is added to Rails::Subscriber, as in the second line of the code above. The test helpers are responsible for setting up the queue and subscriptions, and turning colors in logs off.
The messages are available in the @logger instance, which is a logger with limited powers (it actually does not send anything to your output), and you can collect them doing @logger.logged(level), where level is the level used in logging, like info, debug, warn, and so on.
Namespace
Methods
- S
- W
Instance Public methods
set_logger(logger) Link
Overwrite if you use another logger in your log subscriber.
def logger
ActiveRecord::Base.logger = @logger
end