To ensure the wiring is correct, I've used several stages of testing.
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Visual inspection: make sure that each track section has a power connection, and comes from the correct wire.
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Isolation checks: remove the power connection from the return "blue" rails, and check they are electrically isolated from each other. (This picks up any rail sections that have been connected to the "wrong" return wire).
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Short circuit check: use a coin to short each separate rail segment. Check that the power manager boards detect and isolate the short in one section only, and that the booster does not "beep" indicating a short that the power manager didn't handle.
- Block detection check: use an LED to check that each section has power, and that the block detector reports this section (and only this section) as occupied to LocoNet.
If those tests pass, then the track has been wired correctly!