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# :stopdoc:
#
# One useful feature of log messages in your code is that they provide a
# convenient instrumentation point for testing. Through log messages you can
# confirm that internal methods were called or that certain code paths were
# executed. This example demonstrates how to capture log output during testing
# for later analysis.
#
# The Logging framework provides an RSpec helper that will direct log output
# to a StringIO appender. Log lines can be read from this IO destination
# during tests.
#
require 'rspec'
require 'logging'
require 'rspec/logging_helper'
# Configure RSpec to capture log messages for each test. The output from the
# logs will be stored in the @log_output variable. It is a StringIO instance.
RSpec.configure do |config|
include RSpec::LoggingHelper
config.capture_log_messages
end
# Now within your specs you can check that various log events were generated.
describe 'SuperLogger' do
it 'should be able to read a log message' do
logger = Logging.logger['SuperLogger']
logger.debug 'foo bar'
logger.warn 'just a little warning'
@log_output.readline.should be == 'DEBUG SuperLogger: foo bar'
@log_output.readline.should be == 'WARN SuperLogger: just a little warning'
end
end
# :startdoc:
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