Call Reline-specific method in helper file

test/readline/helper.rb

@@ -21,4 +21,8 @@ else
     Object.send(:remove_const, :Readline) if Object.const_defined?(:Readline)
     Object.const_set(:Readline, Reline)
   end
+
+  def finish_using_lib_reline
+    Reline.test_reset
+  end
 end

test/readline/test_readline.rb

@@ -807,7 +807,7 @@ class TestRelineAsReadline < Test::Unit::TestCase
   end
 
   def teardown
-    Reline.test_reset
+    finish_using_lib_reline
   end
 
   def get_default_internal_encoding

test/readline/test_readline_history.rb

@@ -278,7 +278,7 @@ class TestRelineAsReadlineHistory < Test::Unit::TestCase
   end
 
   def teardown
-    Reline.test_reset
+    finish_using_lib_reline
   end
 
   def get_default_internal_encoding