[ fix, change ] puts behavior for Ruby v3.0.x

lib/extensions.rb

@@ -33,3 +33,12 @@ def to_sjis
   end
 end
 
+module Kernel
+  alias original_kernel_puts puts
+
+  def puts(*args)
+    original_kernel_puts(args)
+  rescue Encoding::CompatibilityError
+    original_kernel_puts(args.map { |arg| arg.force_encoding('utf-8') })
+  end
+end

test/test_i18n.rb

@@ -0,0 +1,23 @@
+# encoding: utf-8
+require 'test_helper'
+require 'aozora2html'
+
+class I18nTest < Test::Unit::TestCase
+  def test_t
+      assert_equal "警告(123行目):JIS外字「①」が使われています",
+                   Aozora2Html::I18n.t(:warn_jis_gaiji,
+                                       123,
+                                       "①".encode("cp932").force_encoding("shift_jis"))
+                     .force_encoding("cp932").encode("utf-8")
+  end
+
+  def test_ruby_puts_behavior
+    $stdout = StringIO.new
+    begin
+      puts "①".encode("cp932").force_encoding("shift_jis")
+      assert_equal "①\n", $stdout.string.force_encoding("cp932").encode("utf-8")
+    ensure
+      $stdout = STDOUT
+    end
+  end
+end