Stop using global constant, RELINE_TEST_ENCODING

test/reline/helper.rb

@@ -7,7 +7,11 @@ module Reline
     def test_mode
         remove_const('IOGate') if const_defined?('IOGate')
         const_set('IOGate', Reline::GeneralIO)
-        encoding = (RELINE_TEST_ENCODING rescue nil)
+        if ENV['RELINE_TEST_ENCODING']
+          encoding = Encoding.find(ENV['RELINE_TEST_ENCODING'])
+        else
+          encoding = Encoding::UTF_8
+        end
         Reline::GeneralIO.reset(encoding: encoding)
         send(:core).config.instance_variable_set(:@test_mode, true)
         send(:core).config.reset
@@ -27,13 +31,6 @@ def finish_pasting
   Reline::GeneralIO.finish_pasting
 end
 
-RELINE_TEST_ENCODING ||=
-  if ENV['RELINE_TEST_ENCODING']
-    Encoding.find(ENV['RELINE_TEST_ENCODING'])
-  else
-    Encoding::UTF_8
-  end
-
 class Reline::TestCase < Test::Unit::TestCase
   private def convert_str(input, options = {}, normalized = nil)
     return nil if input.nil?

test/reline/test_history.rb

@@ -296,7 +296,7 @@ class Reline::History::Test < Reline::TestCase
   end
 
   def get_default_internal_encoding
-    if encoding = (RELINE_TEST_ENCODING rescue nil)
+    if encoding = Reline::IOGate.encoding
       encoding
     elsif RUBY_PLATFORM =~ /mswin|mingw/
       Encoding.default_internal || Encoding::UTF_8

test/reline/test_key_actor_emacs.rb

@@ -7,7 +7,7 @@ class Reline::KeyActor::Emacs::Test < Reline::TestCase
     @config = Reline::Config.new # Emacs mode is default
     Reline::HISTORY.instance_variable_set(:@config, @config)
     Reline::HISTORY.clear
-    @encoding = (RELINE_TEST_ENCODING rescue Encoding.default_external)
+    @encoding = Reline::IOGate.encoding
     @line_editor = Reline::LineEditor.new(@config, @encoding)
     @line_editor.reset(@prompt, encoding: @encoding)
   end
@@ -2140,7 +2140,7 @@ class Reline::KeyActor::Emacs::Test < Reline::TestCase
   end
 
   # Unicode emoji test
-  if RELINE_TEST_ENCODING == Encoding::UTF_8
+  if Reline::IOGate.encoding == Encoding::UTF_8
     def test_ed_insert_for_include_zwj_emoji
       # U+1F468 U+200D U+1F469 U+200D U+1F467 U+200D U+1F466 is family: man, woman, girl, boy "👨‍👩‍👧‍👦"
       input_keys("\u{1F468}") # U+1F468 is man "👨"

test/reline/test_key_actor_vi.rb

@@ -8,7 +8,7 @@ class Reline::KeyActor::ViInsert::Test < Reline::TestCase
     @config.read_lines(<<~LINES.split(/(?<=\n)/))
       set editing-mode vi
     LINES
-    @encoding = (RELINE_TEST_ENCODING rescue Encoding.default_external)
+    @encoding = Reline::IOGate.encoding
     @line_editor = Reline::LineEditor.new(@config, @encoding)
     @line_editor.reset(@prompt, encoding: @encoding)
   end

test/reline/test_macro.rb

@@ -4,7 +4,7 @@ class Reline::MacroTest < Reline::TestCase
   def setup
     Reline.send(:test_mode)
     @config = Reline::Config.new
-    @encoding = (RELINE_TEST_ENCODING rescue Encoding.default_external)
+    @encoding = Reline::IOGate.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")

test/reline/test_reline.rb

@@ -314,7 +314,7 @@ class Reline::Test < Reline::TestCase
   end
 
   def get_reline_encoding
-    if encoding = (RELINE_TEST_ENCODING rescue nil)
+    if encoding = Reline::IOGate.encoding
       encoding
     elsif RUBY_PLATFORM =~ /mswin|mingw/
       Encoding::UTF_8

test/reline/test_string_processing.rb

@@ -6,7 +6,7 @@ class Reline::LineEditor::StringProcessingTest < Reline::TestCase
     @prompt = '> '
     @config = Reline::Config.new
     Reline::HISTORY.instance_variable_set(:@config, @config)
-    @encoding = (RELINE_TEST_ENCODING rescue Encoding.default_external)
+    @encoding = Reline::IOGate.encoding
     @line_editor = Reline::LineEditor.new(@config, @encoding)
     @line_editor.reset(@prompt, encoding: @encoding)
   end

test/reline/test_within_pipe.rb

@@ -3,9 +3,10 @@ require_relative 'helper'
 class Reline::WithinPipeTest < Reline::TestCase
   def setup
     Reline.send(:test_mode)
-    @input_reader, @writer = IO.pipe((RELINE_TEST_ENCODING rescue Encoding.default_external))
+    @encoding = Reline::IOGate.encoding
+    @input_reader, @writer = IO.pipe(@encoding)
     Reline.input = @input_reader
-    @reader, @output_writer = IO.pipe((RELINE_TEST_ENCODING rescue Encoding.default_external))
+    @reader, @output_writer = IO.pipe(@encoding)
     @output = Reline.output = @output_writer
     @config = Reline.send(:core).config
     @config.keyseq_timeout *= 600 if defined?(RubyVM::JIT) && RubyVM::JIT.enabled? # for --jit-wait CI