Rakefile

require 'newrelic_rpm'

class Err
  def self.do
    raise 'here is an error'
  end
end

desc 'test notice error'
task :error do

  NewRelic::Agent.manual_start
  timeout = NewRelic::Agent.config[:'rake.connect_timeout']
  NewRelic::Agent.instance.wait_on_connect(timeout)

  begin
    Err.do
  rescue => e
    NewRelic::Agent.notice_error e
    raise
  end
end