features/support/example_server.rb in ftpd-1.1.1 vs features/support/example_server.rb in ftpd-2.0.0

@@ -1,5 +1,7 @@
+# frozen_string_literal: true
+
 require 'fileutils'
 require 'forwardable'
 require File.expand_path('test_server_files',
                          File.dirname(__FILE__))
 
@@ -48,10 +50,10 @@
   end
 
   private
 
   def read_output
-    output = ''
+    output = ''.dup
     loop do
       line = @io.gets
       break if line.nil?
       output << line
       break if line =~ /FTP server started/