Two 777 hull losses, but MH17 is being excluded from some safety stats (I believe) because it was shot down, a terrorist act, not an accident (how, by what, or by whom is disputed, by one country at least), however MH370 is included, despite the fact that it also has a disputed cause and might have been a terrorist act, or a fire, or <insert favourite conspiracy theory here>.
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Safety stats routinely exclude "acts of war" - which MH17 clearly was (granted there is still some debate on the who, there is no question about the 'what'). Similarly, hijacking are routinely excluded. MH 370 is included simply because a cause hasn't been established - if and when a cause is established then it might be excluded (depending of course on what the cause turn out to be).
Flight test accidents are a bit different - in-flight shutdown rate definitions specifically exclude shutdowns done for testing or flight training purposes, but actual crashes during flight test are never intentional. I would think that if something crashed while operating on an experimental ticket would be excluded (by definition, operating on an experimental ticket means a non-certified configuration) but I don't really know.