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 def setup ActiveRecord::LogSubscriber.attach_to(:active_record) end def test_basic_query_logging Developer.all 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 is reponsible for setting up the queue, subscriptions and turning colors in logs off.
The messages are available in the @logger instance, which is a logger with limited powers (it actually do 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.
Overwrite if you use another logger in your log subscriber:
def logger ActiveRecord::Base.logger = @logger end
# File lib/active_support/log_subscriber/test_helper.rb, line 94 94: def set_logger(logger) 95: ActiveSupport::LogSubscriber.logger = logger 96: end
# File lib/active_support/log_subscriber/test_helper.rb, line 35 35: def setup 36: @logger = MockLogger.new 37: @notifier = ActiveSupport::Notifications::Fanout.new 38: 39: ActiveSupport::LogSubscriber.colorize_logging = false 40: 41: set_logger(@logger) 42: ActiveSupport::Notifications.notifier = @notifier 43: end
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