Range Test and Power Test are standard Z-Wave tests for a repeater.
Range Test sends pings to a given target at the power specified, and reports how many replies it receives. This is useful for testing repeater placement.
Power Test operates the radio at reduced transmit power for a period of time. This is useful for general testing of paths through the repeater.
For both items testing at lower power levels gives you an indication of reliability. If the repeater functions at -9dBm in testing, you can be pretty confident that it will preform reliably at normal power level. However, if the repeater starts to loose packets by -2dBm, you probably need to find a better location.