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-rw-r--r--test/test_client_expire.rb5
1 files changed, 3 insertions, 2 deletions
diff --git a/test/test_client_expire.rb b/test/test_client_expire.rb
index 0260850..9cc85c2 100644
--- a/test/test_client_expire.rb
+++ b/test/test_client_expire.rb
@@ -1,5 +1,6 @@
 # Copyright (C) 2013-2015 all contributors <yahns-public@yhbt.net>
 # License: GPLv3 or later (https://www.gnu.org/licenses/gpl-3.0.txt)
+# frozen_string_literal: true
 require_relative 'server_helper'
 
 class TestClientExpire < Testcase
@@ -53,7 +54,7 @@ class TestClientExpire < Testcase
     s = get_tcp_client(host, port)
     req = "GET / HTTP/1.1\r\nHost: example.com\r\n\r\n"
     s.write(req)
-    str = ""
+    str = ''.dup
     Timeout.timeout(20) { str << s.readpartial(666) until str =~ /\r\n\r\n/ }
     assert_match(%r{keep-alive}, str)
     sleep 2
@@ -113,7 +114,7 @@ class TestClientExpire < Testcase
     s = get_tcp_client(host, port)
     req = "GET / HTTP/1.1\r\nHost: example.com\r\n\r\n"
     s.write(req)
-    str = ""
+    str = ''.dup
     Timeout.timeout(20) { str << s.readpartial(666) until str =~ /\r\n\r\n/ }
     assert_match(%r{keep-alive}, str)
     sleep 1