Gil, the best books list their sources. Any information that makes a claim of fact needs a source to support it. Those sources need to be validated as good sources, the best are what what we call primary sources.
Many of these books do not provide any source information, rendering them just "books of clues". However, if you can validate a few of the lineages, you may begin to trust them as pseudo reliable or a "book of very good clues."
You may also try googling the book along with the word "fraudulent" a small group of these books are known to be fraudulent. Such as those done by Gustav Anjou. However, even Gustav did have some good work and faked key documents to take the lines where he needed to go.
Otherwise, I know of no quick way to test them.