warn when trying to run Rails tests with RAILS_ENV=development

lib/hydra/tasks.rb

@@ -72,6 +72,12 @@ module Hydra #:nodoc:
 
       yield self if block_given?
 
+      if Object.const_defined?('RAILS_ENV') && RAILS_ENV == 'development'
+        $stderr.puts <<-MSG
+WARNING: RAILS_ENV is "development". Make sure to set it properly (ex: "RAILS_ENV=test rake hydra")
+        MSG
+      end
+
       # Ensure we override rspec's at_exit
       require 'hydra/spec/autorun_override'