Let's go a step further! [Linked Image]
How can you tell that the luminaire's properly grounded without taking it off to look at the connection or a using a meter? There's no way to tell with just a light bulb that lights up.
See, it's all relative. What one thinks is OK, another may consider absurd.

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I will check three ways and the light will go on at one switch, off at the second switch, but not back on at the third switch. Inspection Report--Improperly wired three way. How do I know this without a fixture being installed and working?

Do you suppose that somebody that just bought a new home is going to let something like that just slide?...."Aah, we didn't need them to work, anyway. It's OK"
It will be fixed.

It could be a faulty switch properly wired.
It could be the 4 way switch and not one of the 3 ways. Diagnosis is not part of inspection. [Linked Image]