#' @return Depending on the function prefix:
#' If the check is successful, the functions
#' \code{assert<%= fn %>}/\code{assert_<%= convertCamelCase(fn) %>} return
#' \code{x} invisibly, whereas
#' \code{check<%= fn %>}/\code{check_<%= convertCamelCase(fn) %>} and
#' \code{test<%= fn %>}/\code{test_<%= convertCamelCase(fn) %>} return
#' \code{TRUE}.
#' If the check is not successful,
#' \code{assert<%= fn %>}/\code{assert_<%= convertCamelCase(fn) %>}
#' throws an error message,
#' \code{test<%= fn %>}/\code{test_<%= convertCamelCase(fn) %>}
#' returns \code{FALSE},
#' and \code{check<%= fn %>}/\code{check_<%= convertCamelCase(fn) %>}
#' return a string with the error message.
#' The function \code{expect_<%= convertCamelCase(fn) %>} always returns an
#' \code{\link[testthat]{expectation}}.
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