  Code verification plays an important role in establishing the credibility of
computational simulations by assessing the correctness of the implementation of
the underlying numerical methods. In computational electromagnetics, the
numerical solution to integral equations incurs multiple interacting sources of
numerical error, as well as other challenges, which render traditional
code-verification approaches ineffective. In this paper, we provide approaches
to separately measure the numerical errors arising from these different error
sources for the method-of-moments implementation of the combined-field integral
equation. We demonstrate the effectiveness of these approaches for cases with
and without coding errors.
