Add logger to SharedHelper.

Author: varyonic

shared_helper.rb

@@ -1,7 +1,16 @@
+require 'logger'
+require 'yaml'
+
 module SharedHelper
   def config
     $credentials ||= YAML.load_file(__dir__ + "/credentials.yml")
   rescue Errno::ENOENT
     warn "WARNING: Running w/o valid AuthorizeNet sandbox credentials. Create spec/credentials.yml."
   end
-end
+
+  def logger
+    @logger ||= Logger.new(STDOUT).tap { |logger| logger.level = Logger.const_get(ENV['LOGLEVEL'] || 'INFO') }
+  end
+end
+
+include SharedHelper