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require 'active_support/log_subscriber'
module ActiveSupport
class LogSubscriber
# 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.
#
module TestHelper
def setup
@logger = MockLogger.new
@notifier = ActiveSupport::Notifications::Notifier.new(queue)
ActiveSupport::LogSubscriber.colorize_logging = false
set_logger(@logger)
ActiveSupport::Notifications.notifier = @notifier
end
def teardown
set_logger(nil)
ActiveSupport::Notifications.notifier = nil
end
class MockLogger
attr_reader :flush_count
def initialize
@flush_count = 0
@logged = Hash.new { |h,k| h[k] = [] }
end
def method_missing(level, message)
@logged[level] << message
end
def logged(level)
@logged[level].compact.map { |l| l.to_s.strip }
end
def flush
@flush_count += 1
end
end
# Wait notifications to be published.
def wait
@notifier.wait
end
# Overwrite if you use another logger in your log subscriber:
#
# def logger
# ActiveRecord::Base.logger = @logger
# end
#
def set_logger(logger)
ActiveSupport::LogSubscriber.logger = logger
end
def queue
ActiveSupport::Notifications::Fanout.new
end
end
end
end
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