R/comparison.R

In Data-Camp/testwhat: Easily write submission correctness tests for R exercises

#' Check if object is true, false, >= or <.
#'
#' Utility functions to use inside \code{\link{check_that}}.
#'
#' @param x object to test
#' @param y single numeric value to compare
#' @name compare

#' @rdname compare
#' @export
is_true <- function(x) {
  identical(as.vector(x), TRUE)
}

#' @rdname compare
#' @export
is_false <- function(x) {
  identical(as.vector(x), FALSE)
}

#' @rdname compare
#' @export
is_gte <- function(x, y) {
  stopifnot(is.numeric(x), length(x) == 1)
  stopifnot(is.numeric(y), length(y) == 1)
  x >= y
}

#' @rdname compare
#' @export
is_lt <- function(x, y) {
  stopifnot(is.numeric(x), length(x) == 1)
  stopifnot(is.numeric(y), length(y) == 1)
  x < y
}