Fix tests

Author: jas14

spec/support/helpers.rb

@@ -12,10 +12,10 @@ def self.divider(title = '')
         start_length = 3
 
         string = ''
-        string << ('-' * start_length)
-        string << title
-        string << ('-' * (total_length - start_length - title.length))
-        string << "\n"
+        string += ('-' * start_length)
+        string += title
+        string += ('-' * (total_length - start_length - title.length))
+        string += "\n"
         string
       end
     end