Why are tests restarting in Github?

[ag0aep6g via Digitalmars-d]

On 24.04.2016 21:26, tcak wrote:
> There are 10 test. Some of them gets completed. And then, I look at it
> again, tests have restarted, and less number of tests are passed at that
> point.
>
> 1. What is the reason of restarts?

Something else has been pulled. That changes the code that's being 
tested, so all tests need to restarted.

> 2. What is reason of long waiting time? Sometimes number of passed tests
> stay there 2-3 days.

The pull request is probably not a priority for the auto-tester. Pull 
requests that have been marked for auto-merging have priority over 
others. I'm not sure, but the auto-tester may also prioritize requests 
with recent activity over older ones.