1 files changed, 19 insertions, 0 deletions
diff --git a/test/test_pty.rb b/test/test_pty.rb
index 684ab2c01b..704861dd3c 100644
--- a/test/test_pty.rb
+++ b/test/test_pty.rb
@@ -98,5 +98,24 @@ class TestPTY < Test::Unit::TestCase
     }
   end
 
+  def test_stat_slave
+    # If grantpt is used, the slave device is changed as follows.
+    #   owner: real UID
+    #   group: an unspecified value (e.g. tty)
+    #   mode: 0620 (rw--w----)
+    #
+    # The group is not testable because unspecified.
+    #
+    # The mode is testable but the condition is relaxed because other
+    # pty functions (openpty, _getpty, etc.) may not use 0620.
+    # But no one can read from the tty, I hope (for security reason).
+    #
+    PTY.open {|master, slave|
+      s =  File.stat(slave.path)
+      assert_equal(Process.uid, s.uid)
+      assert_equal(0600, s.mode & 0755)
+    }
+  end
+
 end if defined? PTY