[ruby-core:97658] test_io_console error?

Is it an error in test_io_console if the tests are not run in an window 
manager system? The error does not occur if the build is triggered in an 
xterm type window.

Ruby:
Date: Sat Feb 8
commit 826f44834fe11f3f9c52343443a15b6c83466889

   1) Error:
TestIO_Console#test_set_winsize_console:
Errno::EINVAL: Invalid argument
     /usr/local/src/ruby/test/io/console/test_io_console.rb:432:in 
`winsize='
     /usr/local/src/ruby/test/io/console/test_io_console.rb:432:in 
`test_set_winsize_console'


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