Test Connection (Reconnect) and Test All Connections (Reconnect) have the same icon, and no tool-tip.
I use them a lot, so I pinned them on my Standard toolbar - but cannot see the difference.
Luckily I remember, in which order I've placed them.
But perhaps an idea to add a tool-tip, or even draw something on the "All" button.
Sure, makes sense. I'll log it as an enhancement for 15.1. It's too late for 15.0.
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Beautiful - thanks for adding 
"Beautiful" may be a stretch of my artistic skills, but you're welcome.