tests/testthat/test-discount.R

In Health-Economics-in-R/QALY: Calculate Quality Adjusted Life Years (QALYs) Gains with Discounting and Inflated Costs

# context("Discount over time")
#
#
# library(QALY)
#
# test_that("simple discount rates", {
#
#   expect_equal(discount(t_limit = 2, discount_rate = 1), c(1, 0.5))
#   expect_equal(discount(t_limit = 10, discount_rate = 0), rep(1, 10))
# })
#
# test_that("format of output", {
#
#   expect_length(discount(t_limit = 2, discount_rate = 1), 2)
#   expect_length(discount(discount_rate = 1), 100)
# })
#
#
# test_that("Encapsulate discounting simple rates", {
#
#   discount_factor <- make_discount(discount_rate = 0)
#   expect_equal(c(discount_factor(), discount_factor()), c(1, 1) )
#
#   discount_factor <- make_discount(discount_rate = 1)
#   expect_equal(c(discount_factor(), discount_factor()), c(1, 0.5) )
#
# })
#
# test_that("Encapsulate discounting format of output", {
#
#   discount_factor <- make_discount(discount_rate = 0)
#   expect_length( c(discount_factor(), discount_factor()), 2 )
# })
#
#
# test_that("input assertion errors", {
#
#   expect_error(discount(discount_rate = "abc"), regexp = "must be number between 0 and 1")
#   expect_error(discount(discount_rate = -1), regexp = "must be number between 0 and 1")
#   expect_error(discount(discount_rate = 100), regexp = "must be number between 0 and 1")
#   expect_error(discount(t_limit = "abc"), regexp = "be an integer great than 0")
#   expect_error(discount(t_limit = -1), regexp = "be an integer great than 0")
#
#   expect_error(discount(t_limit = 1.5), regexp = "Time limit must be whole number")
# })