If you have a B&D WorkMate or something similar, this will help to give you a pretty good idea of fork integrity - sort of...



Clamp the fork in the WM and, if you have another fork, clamp it in the other end. Do your best to ensure that they are level, side to side. Run a string through one brake bolt hole and to an axle, or some other tool attached to the drops of the fork you wish to consider...



Now, consider if the string splits the brake bolt hole of the fork under investigation. If not, your stem might be bent or the fork blade might be bent. So...



To check the blades for out of true, install your wheel and see how it splits the space between the tops of the blades. If off, chances are the blades are bent...



Use your imagination to figure out if a fork or frame set is out of true. And, for those who want a quick check (not a perfect works every time method), hang your bicycle upside down by a single strand of string, attached to each wheel...



If the front wheel hangs straight, it is most likely that your frame/fork are true. If the front wheel wants to turn off center, then you probably have an alignment issue.

Hope that is a help.