tests illustrating problems with Timeout.timeout

gistfile1.rb

def subject(throws, catches)
  $inner_succeeded=nil
  $raised_in_inner=nil
  $caught_in_inner=nil

  $raised_in_outer=nil
  $not_raised_in_outer=nil
  begin
    Timeout.timeout(0.1, throws){
      begin
        sleep 0.2
      rescue catches
        $caught_in_inner=true
      else
        $inner_succeeded=true
      ensure
        $raised_in_inner=true
      end
    }
  rescue Exception
    $raised_in_outer = true
  else
    $not_raised_in_outer = true
  end
  sleep 0.3 # an extra .1 for good measure
end

puts "when an exception to raise is not specified and the inner code does not catch Exception"
def test_1
  subject(nil, StandardError)

  # EXPECTED
  assert !$inner_succeeded
  assert !$caught_in_inner
  assert $raised_in_outer && !$not_raised_in_outer

  # WEIRD
  assert $raised_in_inner
end

puts "when an exception to raise is not specified and the inner code does catch Exception"
def test_2
  subject(nil, Exception)

  # EXPECTED
  assert !$inner_succeeded

  # WEIRD
  assert $raised_in_inner
  assert $caught_in_inner

  # BAD
  assert !$raised_in_outer && $not_raised_in_outer
end

puts "when an exception to raise is StandardError and the inner code does not catch Exception"
class MyError < StandardError; end
def test_3
  subject(MyError, StandardError)

  # EXPECTED
  assert !$inner_succeeded

  # WEIRD
  assert $raised_in_inner
  assert $caught_in_inner

  # BAD
  assert !$raised_in_outer && $not_raised_in_outer
end

puts "when an exception to raise is StandardError and the inner code does catch Exception"
class MyError2 < StandardError; end
def test_4
  subject(MyError2, Exception)

  # EXPECTED
  assert !$inner_succeeded

  # WEIRD
  assert $raised_in_inner
  assert $caught_in_inner

  # BAD
  assert !$raised_in_outer && $not_raised_in_outer
end

puts "when an exception to raise is Exception and the inner code does not catch Exception"
class MyError3 < Exception; end
def test_5
  subject(MyError3, StandardError)

  # EXPECTED
  assert !$inner_succeeded
  assert !$caught_in_inner
  assert $raised_in_outer && !$not_raised_in_outer

  # WEIRD
  assert $raised_in_inner
end

puts "when an exception to raise is Exception and the inner code does catch Exception"
class MyError4 < Exception; end
def test_6
  subject(MyError4, Exception)

  # EXPECTED
  assert !$inner_succeeded

  # WEIRD
  assert $raised_in_inner
  assert $caught_in_inner

  # VERY BAD
  assert !$raised_in_outer && $not_raised_in_outer
end