Missing test helper (#18537).

git-svn-id: http://svn.redmine.org/redmine/trunk@13761 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/test_helper.rb

@@ -163,6 +163,10 @@ class ActiveSupport::TestCase
     hs
   end
 
+  def sqlite?
+    ActiveRecord::Base.connection.adapter_name =~ /sqlite/i
+  end
+
   def assert_save(object)
     saved = object.save
     message = "#{object.class} could not be saved"