test-timers-same-timeout-wrong-list-deleted was flaky under load because
there is no guarantee that a timer will fire within a given period of
time. It had an exit handler that checked that the process was finishing
in less than twice as much as a timer was set for. Under load, the
timer could take over 200ms to fire even if it was set for 100ms, so
this was causing the test to be flaky on CI from time to time.
However, that timing check is unnecessary to identify the regression
that the test was written for. When run with a version of Node.js that
does not contain the fix that accompanied the test in its initial
commit, an assertion indicating that there were still timers in the
active timer list fired. So, this commit removes the exit handler timing
check and relies on the existing robust active timers list length check.
This allows us to move the test back to parallel because it does not
seem to fail under load anymore.
The test was refactored slightly, removing duplicated code to a
function, using `assert.strictEqual()` instead of `assert.equal()`,
changing a 10ms timer to 1ms, and improving the messages provided by
assertions.
Fixes: https://github.com/nodejs/node/issues/8459
PR-URL: https://github.com/nodejs/node/pull/10362
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Rich Trott