test_io.rb: workaround for Docker

* test/ruby/test_io.rb (test_ioctl_linux2): tty device may not
  work on Docker.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56349 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 8 insertions, 2 deletions

diff --git a/test/ruby/test_io.rb b/test/ruby/test_io.rb
index 505525d95e..99ccf7e9d6 100644
--- a/test/ruby/test_io.rb
+++ b/test/ruby/test_io.rb
@@ -2891,13 +2891,19 @@ End
 
   def test_ioctl_linux2
     return unless STDIN.tty? # stdin is not a terminal
-    File.open('/dev/tty') { |f|
+    begin
+      f = File.open('/dev/tty')
+    rescue Errno::ENOENT, Errno::ENXIO => e
+      skip e.message
+    else
       tiocgwinsz=0x5413
       winsize=""
       assert_nothing_raised {
         f.ioctl(tiocgwinsz, winsize)
       }
-    }
+    ensure
+      f.close if f
+    end
   end if /^(?:i.?86|x86_64)-linux/ =~ RUBY_PLATFORM
 
   def test_setpos