Truncate method names in system tests

Author: Sam Phippen

lib/rspec/rails/example/system_example_group.rb

@@ -37,8 +37,7 @@ def method_name
         @method_name ||= [
           self.class.name.underscore,
           RSpec.current_example.description.underscore,
-          rand(1000)
-        ].join("_").tr(CHARS_TO_TRANSLATE.join, "_")
+        ].join("_").tr(CHARS_TO_TRANSLATE.join, "_")[0...251] + "_#{rand(1000)}"
       end
 
       # Delegates to `Rails.application`.