From 8df1ace64a7695c855bf0a774e3fd70edfab0bf3 Mon Sep 17 00:00:00 2001
From: Csaba Henk <csaba@redhat.com>
Date: Tue, 10 Aug 2021 01:07:06 +0200
Subject: Fix ARGF.read(length) short read [Bug #18074]

---
 test/ruby/test_argf.rb | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'test/ruby')

diff --git a/test/ruby/test_argf.rb b/test/ruby/test_argf.rb
index 7922e5ad07..76a2720d47 100644
--- a/test/ruby/test_argf.rb
+++ b/test/ruby/test_argf.rb
@@ -1110,4 +1110,13 @@ class TestArgf < Test::Unit::TestCase
       assert_raise(TypeError, bug11610) {gets}
     };
   end
+
+  def test_sized_read
+    [@t1, @t2, @t3].each { |t|
+      open(t.path, "wb") { |f| f.write "t" }
+    }
+    ruby('-e', "print ARGF.read(3).size", @t1.path, @t2.path, @t3.path) do |f|
+      assert_equal("3", f.read)
+    end
+  end
 end
-- 
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