[Bug #20924] Fix reading with delimiter in wide character encodings

1 files changed, 30 insertions, 0 deletions

diff --git a/test/ruby/test_io.rb b/test/ruby/test_io.rb
index 0abc71a5b0..ec080080c5 100644
--- a/test/ruby/test_io.rb
+++ b/test/ruby/test_io.rb
@@ -2036,6 +2036,36 @@ class TestIO < Test::Unit::TestCase
     }
   end
 
+  def test_readline_limit_nonascii
+    mkcdtmpdir do
+      i = 0
+
+      File.open("text#{i+=1}", "w+:utf-8") do |f|
+        f.write("Test\nok\u{bf}ok\n")
+        f.rewind
+
+        assert_equal("Test\nok\u{bf}", f.readline("\u{bf}"))
+        assert_equal("ok\n", f.readline("\u{bf}"))
+      end
+
+      File.open("text#{i+=1}", "w+b:utf-32le") do |f|
+        f.write("0123456789")
+        f.rewind
+
+        assert_equal(4, f.readline(4).bytesize)
+        assert_equal(4, f.readline(3).bytesize)
+      end
+
+      File.open("text#{i+=1}", "w+:utf-8:utf-32le") do |f|
+        f.write("0123456789")
+        f.rewind
+
+        assert_equal(4, f.readline(4).bytesize)
+        assert_equal(4, f.readline(3).bytesize)
+      end
+    end
+  end
+
   def test_set_lineno_readline
     pipe(proc do |w|
       w.puts "foo"