PTY exit status test

pty_test.rb

require 'pty'
require 'test/unit'

# See also:
# * http://stackoverflow.com/questions/3874604/pty-spawn-child-exit-code/7263243#7263243
# * http://redmine.ruby-lang.org/issues/5253
class PTYTest < Test::Unit::TestCase
  def setup
    system "true"
    assert_equal 0, $?.exitstatus
  end

  def pty(cmd, &block)
    PTY.spawn(cmd, &block)
    $?.exitstatus
  end

  def test_pty_with_wait_correctly_sets_exit_status_for_master_slave_io
    status = pty("printf 'abc'; exit 8") do |r,w,pid|
      while !r.eof?
        r.getc
      end
      Process.wait(pid)
    end
    assert_equal 8, status
  end

  def test_pty_with_wait_correctly_sets_exit_status_for_basic_commands
    status = pty("true") do |r,w,pid|
      Process.wait(pid)
    end
    assert_equal 0, status

    status = pty("false") do |r,w,pid|
      Process.wait(pid)
    end
    assert_equal 1, status
  end

  def test_pty_with_wait_sets_exit_status_1_for_immediate_exit
    status = pty("exit 8") do |r,w,pid|
      Process.wait(pid)
    end
    assert_equal 1, status
  end

  def test_pty_with_kill
    status = pty("sleep 10") do |r,w,pid|
      Process.kill(9, pid)
      Process.wait(pid)
    end

    assert_equal nil, status
  end
end