There isn't really a good way. The "associated equipment" is all electronics, and so doesn't really wear out. (And if something does break, a replacement can generally be found by checking wrecking yards online.) For the battery, the thing to check for is recals, which are when a battery that indicated full (or part full) charge suddenly drops to zero. You can do a sort of quick & dirty test for this, by putting the car in a situation where it draws a good bit of assist for a long time, such as climbing a mountain road. If it drops gradually for a bit, then suddenly, the battery is somewhat weak.
You can still drive the car acceptably with a battery like this, especially if (as I see you probably do) you drive mostly in flatter country. If you're willing to tinker, you can also do pack rebalancing, or replace the few weak strings that (often) cause the problem. You can find a whole bunch more info here:
Is it too late? I think not if we act now - MIMA Honda Insight Modified Integrated Motor Assist