https://git.ruby-lang.org/ruby.git/commit/?id=e56e089b1f

From e56e089b1f92dbc55d3239b6843dd0786be9000e Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sat, 11 Apr 2020 12:06:59 +0900
Subject: Assertions for basic use of `encoding:` option


diff --git a/test/ruby/test_dir.rb b/test/ruby/test_dir.rb
index 3e33eef..13b9c1d 100644
--- a/test/ruby/test_dir.rb
+++ b/test/ruby/test_dir.rb
@@ -320,6 +320,9 @@ class TestDir < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_dir.rb#L320
     assert_entries(Dir.open(@root) {|dir| dir.entries})
     assert_entries(Dir.entries(@root))
     assert_raise(ArgumentError) {Dir.entries(@root+"\0")}
+    [Encoding::UTF_8, Encoding::ASCII_8BIT].each do |enc|
+      assert_equal(enc, Dir.entries(@root, encoding: enc).first.encoding)
+    end
   end
 
   def test_foreach
@@ -332,12 +335,19 @@ class TestDir < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_dir.rb#L335
     Dir.mkdir(newdir)
     File.write(newdir+"/a", "")
     assert_equal(%w[. .. a], e.to_a.sort)
+    [Encoding::UTF_8, Encoding::ASCII_8BIT].each do |enc|
+      e = Dir.foreach(newdir, encoding: enc)
+      assert_equal(enc, e.to_a.first.encoding)
+    end
   end
 
   def test_children
     assert_entries(Dir.open(@root) {|dir| dir.children}, true)
     assert_entries(Dir.children(@root), true)
     assert_raise(ArgumentError) {Dir.children(@root+"\0")}
+    [Encoding::UTF_8, Encoding::ASCII_8BIT].each do |enc|
+      assert_equal(enc, Dir.children(@root, encoding: enc).first.encoding)
+    end
   end
 
   def test_each_child
@@ -350,6 +360,10 @@ class TestDir < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_dir.rb#L360
     Dir.mkdir(newdir)
     File.write(newdir+"/a", "")
     assert_equal(%w[a], e.to_a)
+    [Encoding::UTF_8, Encoding::ASCII_8BIT].each do |enc|
+      e = Dir.each_child(newdir, encoding: enc)
+      assert_equal(enc, e.to_a.first.encoding)
+    end
   end
 
   def test_dir_enc
-- 
cgit v0.10.2


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