fix race condition involving engine.destroy() and ready
event
#199
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The 'ready' event sets up an interval timer that is cleared in
destroy()
. However, in some situations, it is possible to for theinterval to be created after
destroy()
has run, resulting in aninterval timer that is never cleared, and thus an app that does not
exit when it is supposed to. This change fixes the issue and adds a
test for it.
Refs: #198