Use 24x80 size in test

Author: tompng

test/reline/helper.rb

@@ -29,13 +29,19 @@ def test_mode(ansi: false)
       else
         encoding = Encoding::UTF_8
       end
+      @original_get_screen_size = IOGate.method(:get_screen_size)
+      IOGate.singleton_class.remove_method(:get_screen_size)
+      def IOGate.get_screen_size
+        [24, 80]
+      end
       Reline::GeneralIO.reset(encoding: encoding) unless ansi
       core.config.instance_variable_set(:@test_mode, true)
       core.config.reset
-      Reline.line_editor.instance_variable_set(:@screen_size, [24, 80])
     end
 
     def test_reset
+      IOGate.singleton_class.remove_method(:get_screen_size)
+      IOGate.define_singleton_method(:get_screen_size, @original_get_screen_size)
       remove_const('IOGate')
       const_set('IOGate', @original_iogate)
       Reline::GeneralIO.reset

test/reline/test_macro.rb

@@ -6,7 +6,6 @@ def setup
     @config = Reline::Config.new
     @encoding = Reline.core.encoding
     @line_editor = Reline::LineEditor.new(@config, @encoding)
-    @line_editor.instance_variable_set(:@screen_size, [24, 80])
     @output = @line_editor.output = File.open(IO::NULL, "w")
   end