From 2ad35b31bb844bee95bc29d85a0508c10f99d428 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 18 Dec 2017 04:32:54 +0000
Subject: io.c: opening external command

* io.c (rb_io_open_generic): when external command will be invoked
  as other than IO singleton method, probably unintentionally,
  warn if it is File or raise ArgumentError.

From: Nobuyoshi Nakada <nobu@ruby-lang.org>

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61317 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 test/ruby/test_io.rb | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'test/ruby')

diff --git a/test/ruby/test_io.rb b/test/ruby/test_io.rb
index 00369365d0..89c68b6cb2 100644
--- a/test/ruby/test_io.rb
+++ b/test/ruby/test_io.rb
@@ -2184,6 +2184,15 @@ class TestIO < Test::Unit::TestCase
     end
   end
 
+  def test_read_command
+    assert_warn(/invoke external command/) do
+      File.read("|#{EnvUtil.rubybin} -e puts")
+    end
+    assert_raise_with_message(ArgumentError, /invoke external command/) do
+      Class.new(IO).read("|#{EnvUtil.rubybin} -e puts")
+    end
+  end
+
   def test_reopen
     make_tempfile {|t|
       open(__FILE__) do |f|
-- 
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