https://git.ruby-lang.org/ruby.git/commit/?id=0c54d2e2c7

From 0c54d2e2c7697aa5d6a1315b79c16b88d34f5e81 Mon Sep 17 00:00:00 2001
From: Takashi Kokubun <takashikkbn@g...>
Date: Thu, 25 Apr 2019 23:53:57 +0900
Subject: Force IRB::Color to recognize TERM

Closes: https://github.com/ruby/ruby/pull/2150

diff --git a/test/irb/test_color.rb b/test/irb/test_color.rb
index 088611c..d5f9286 100644
--- a/test/irb/test_color.rb
+++ b/test/irb/test_color.rb
@@ -1,6 +1,7 @@ https://github.com/ruby/ruby/blob/trunk/test/irb/test_color.rb#L1
 # frozen_string_literal: false
 require 'test/unit'
 require 'irb/color'
+require 'stringio'
 
 module TestIRB
   class TestColor < Test::Unit::TestCase
@@ -23,7 +24,7 @@ module TestIRB https://github.com/ruby/ruby/blob/trunk/test/irb/test_color.rb#L24
         'ERB.new("a#{nil}b", trim_mode: "-")' => "#{BLUE}#{BOLD}#{UNDERLINE}ERB#{CLEAR}.new(#{RED}\"#{CLEAR}#{RED}a#{CLEAR}#{RED}\#{#{CLEAR}#{CYAN}#{BOLD}nil#{CLEAR}#{RED}}#{CLEAR}#{RED}b#{CLEAR}#{RED}\"#{CLEAR}, #{MAGENTA}trim_mode:#{CLEAR} #{RED}\"#{CLEAR}#{RED}-#{CLEAR}#{RED}\"#{CLEAR})",
         "# comment" => "#{BLUE}#{BOLD}# comment#{CLEAR}",
       }.each do |code, result|
-        assert_equal(result, IRB::Color.colorize_code(code))
+        assert_equal(result, with_term { IRB::Color.colorize_code(code) })
       end
     end
 
@@ -40,5 +41,22 @@ module TestIRB https://github.com/ruby/ruby/blob/trunk/test/irb/test_color.rb#L41
         assert_equal(result, IRB::Color.inspect_colorable?(object))
       end
     end
+
+    private
+
+    def with_term
+      stdout = $stdout
+      io = StringIO.new
+      def io.tty?; true; end
+      $stdout = io
+
+      env = ENV.to_h.dup
+      ENV['TERM'] = 'xterm-256color'
+
+      yield
+    ensure
+      $stdout = stdout
+      ENV.replace(env) if env
+    end
   end
 end
-- 
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