We have found that reliance on theoretical models or incomplete manufacturer's data is not adequate for predicting the result of combining optical and electro-optical components into a system. The complete imaging characteristics of each component must be accurately known if reliable predictions are expected. Inhouse testing then is desirable where possible. Some components have well-established evaluation procedures. Others, such as coherent fiber optics, require various test techniques, some well established; others must be devised if complete characterization is needed. This is especially true where changes in magnification are a feature of the bundle. A description of the techniques we use for testing the modulation transfer function, image rotation, magnification, image size variation, distortion, shear, transmission efficiency, transmission variation, transmission defects, flatness, and acceptance angle are included in this paper.