@omit excludes example code from a test until the next tag.
Use @resume to restart including code without creating an expectation.
Details
Use @omit to avoid redundant or noisy code:
#' @doctest
#'
#' @expect equal(0)
#' sin(0)
#'
#' @omit
#' curve(sin(x), 0, 2 * pi)
#'
#' @expect equal(1)
#' cos(0)@omit is separate from \donttest and \dontrun tags in Rd files. This
allows you to test code that would cause an error if run by R CMD CHECK. If
you also want R CMD CHECK to skip your code, you should use \donttest{}
separately (see
writing R extensions).
Remember that the main purpose of examples is to document your package for
your users. If your code is getting too different from your example, consider
splitting it off into a proper test file. You can do this by renaming it and
deleting the Generated by doctest comment.