Add random test ordering where available

pixeltrix · pixeltrix · commit 5438d9109550 · 2016-11-12T11:05:35.000Z
diff --git a/test/abstract_unit.rb b/test/abstract_unit.rb
@@ -6,3 +6,6 @@
 
 FIXTURE_LOAD_PATH = File.expand_path('../fixtures', __FILE__)
 
+if ActiveSupport.respond_to?(:test_order)
+  ActiveSupport.test_order = :random
+end
