https://git.ruby-lang.org/ruby.git/commit/?id=8f1062127e

From 8f1062127e40767240aa0a0fe18fd48687bc04e9 Mon Sep 17 00:00:00 2001
From: aycabta <aycabta@g...>
Date: Thu, 21 Nov 2019 07:28:18 +0900
Subject: Add test/reline/test_string_processing.rb


diff --git a/test/reline/test_string_processing.rb b/test/reline/test_string_processing.rb
new file mode 100644
index 0000000..4df0363
--- /dev/null
+++ b/test/reline/test_string_processing.rb
@@ -0,0 +1,23 @@ https://github.com/ruby/ruby/blob/trunk/test/reline/test_string_processing.rb#L1
+require_relative 'helper'
+
+class Reline::LineEditor::StringProcessingTest < Reline::TestCase
+  def setup
+    Reline.send(:test_mode)
+    @prompt = '> '
+    @config = Reline::Config.new
+    Reline::HISTORY.instance_variable_set(:@config, @config)
+    @encoding = (RELINE_TEST_ENCODING rescue Encoding.default_external)
+    @line_editor = Reline::LineEditor.new(@config)
+    @line_editor.reset(@prompt, @encoding)
+  end
+
+  def test_calculate_width
+    width = @line_editor.send(:calculate_width, 'Ruby string')
+    assert_equal('Ruby string'.size, width)
+  end
+
+  def test_calculate_width_with_escape_sequence
+    width = @line_editor.send(:calculate_width, "\1\e[31m\2RubyColor\1\e[34m\2 default string \1\e[m\2>", true)
+    assert_equal('RubyColor default string >'.size, width)
+  end
+end
-- 
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