Change debug test workaround only enabled when output is tty #949
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In #943, we add a workaround
puts
but it caused IRB binding spec failure in ruby/ruby#10712.To minimize the impact and to avoid test failure in other project, I think it is better to restrict this workaround only to tty environment.
For other projects that runs integration test using
IO.popen
in other projects won't be affected by the workaround.The workaround still works for debug because debug uses
PTY.open
, notIO.popen
.