lib/rubocop/cop/minitest/refute_operator.rb in rubocop-minitest-0.33.0 vs lib/rubocop/cop/minitest/refute_operator.rb in rubocop-minitest-0.34.0

@@ -38,10 +38,10 @@
 
         private
 
         def build_new_arguments(node)
           lhs, op, rhs = *node.first_argument
-          new_arguments = "#{lhs.source}, :#{op}, #{rhs.source}"
+          new_arguments = +"#{lhs.source}, :#{op}, #{rhs.source}"
 
           if node.arguments.count == 2
             new_arguments << ", #{node.last_argument.source}"
           else
             new_arguments