# NextBest ----

## v_next_best_ewoc ----

test_that("v_next_best_ewoc passes for valid object", {
  object <- .NextBestEWOC()
  expect_true(v_next_best_ewoc(object))
})

test_that("v_next_best_ewoc returns message for non-valid target", {
  object <- .NextBestEWOC()
  object@target <- -0.1
  err_msg <- "target must be a probability value from (0, 1) interval"
  expect_equal(v_next_best_ewoc(object), err_msg)
})

test_that("v_next_best_ewoc returns message for non-valid overdose", {
  object <- .NextBestEWOC()
  object@overdose <- c(-0.2, 1.2)
  err_msg <- c(
    "target must be below the overdose interval",
    "overdose has to be a probability range"
  )
  expect_equal(v_next_best_ewoc(object), err_msg)
})

test_that("v_next_best_ewoc returns message for non-valid max_overdose_prob", {
  object <- .NextBestEWOC()
  object@max_overdose_prob <- 1.0
  err_msg <- "max_overdose_prob must be a probability value from (0, 1) interval"
  expect_equal(v_next_best_ewoc(object), err_msg)
})

## v_next_best_mtd ----

test_that("v_next_best_mtd passes for valid object", {
  object <- h_next_best_mtd()
  expect_true(v_next_best_mtd(object))
})

test_that("v_next_best_mtd returns message for non-valid target", {
  err_msg <- "target must be a probability value from (0, 1) interval"
  object <- h_next_best_mtd()

  # Changing `target` so that it does not represent allowed probability value.
  object@target <- 1
  expect_equal(v_next_best_mtd(object), err_msg)
  object@target <- 0
  expect_equal(v_next_best_mtd(object), err_msg)
  object@target <- -0.5
  expect_equal(v_next_best_mtd(object), err_msg)

  # Changing `target` so that it is not a scalar.
  object@target <- c(0.5, 0.6)
  expect_equal(v_next_best_mtd(object), err_msg)
})

test_that("v_next_best_mtd returns message for non-valid derive", {
  object <- h_next_best_mtd()

  # Changing `derive` so that it has many arguments.
  object@derive <- function(x, y) 1L
  expect_equal(
    v_next_best_mtd(object),
    "derive must have a single argument"
  )

  # Changing `derive` so that it does not return a number.
  object@derive <- function(x) c(1, 2)
  expect_equal(
    v_next_best_mtd(object),
    "derive must accept numerical vector as an argument and return a number"
  )
})

## v_next_best_ncrm ----

test_that("v_next_best_ncrm passes for valid object", {
  object <- h_next_best_ncrm()
  expect_true(v_next_best_ncrm(object))

  object <- h_next_best_ncrm(edge_case = TRUE)
  expect_true(v_next_best_ncrm(object))
})

test_that("v_next_best_ncrm returns message for non-valid target", {
  err_msg <- "target has to be a probability range"
  object <- h_next_best_ncrm()

  # Changing `target` so that it is not an interval.
  object@target <- 0.6
  expect_equal(v_next_best_ncrm(object), err_msg)
  object@target <- c(0.5, 0.6, 0.8)
  expect_equal(v_next_best_ncrm(object), err_msg)
  object@target <- c(0.8, 0.6)
  expect_equal(v_next_best_ncrm(object), err_msg)

  # Changing `target` so that one bound is not a valid probability value.
  object@target <- c(0.4, 1.2)
  expect_equal(v_next_best_ncrm(object), err_msg)
})

test_that("v_next_best_ncrm returns message for non-valid overdose", {
  err_msg <- "overdose has to be a probability range"
  object <- h_next_best_ncrm()

  # Changing `overdose` so that it is not an interval.
  object@overdose <- 0.6
  expect_equal(v_next_best_ncrm(object), err_msg)
  object@overdose <- c(0.5, 0.6, 0.8)
  expect_equal(v_next_best_ncrm(object), err_msg)
  object@overdose <- c(0.8, 0.6)
  expect_equal(v_next_best_ncrm(object), err_msg)

  # Changing `overdose` so that one bound is not a valid probability value.
  object@overdose <- c(0.4, 1.2)
  expect_equal(v_next_best_ncrm(object), err_msg)
})

test_that("v_next_best_ncrm returns message for non-valid max_overdose_prob", {
  err_msg <- "max_overdose_prob must be a probability value from (0, 1) interval"
  object <- h_next_best_ncrm()

  # Changing `max_overdose_prob` so that it does not represent allowed probability value.
  object@max_overdose_prob <- 1
  expect_equal(v_next_best_ncrm(object), err_msg)
  object@max_overdose_prob <- 0
  expect_equal(v_next_best_ncrm(object), err_msg)
  object@max_overdose_prob <- -0.5
  expect_equal(v_next_best_ncrm(object), err_msg)

  # Changing `max_overdose_prob` so that it is not a scalar.
  object@max_overdose_prob <- c(0.5, 0.6)
  expect_equal(v_next_best_ncrm(object), err_msg)
})

## v_next_best_ncrm_loss ----

test_that("v_next_best_ncrm_loss passes for valid object", {
  object <- h_next_best_ncrm_loss()
  expect_true(v_next_best_ncrm_loss(object))

  object <- h_next_best_ncrm_loss(edge_case = 1L)
  expect_true(v_next_best_ncrm_loss(object))

  object <- h_next_best_ncrm_loss(edge_case = 2L)
  expect_true(v_next_best_ncrm_loss(object))
})

test_that("v_next_best_ncrm_loss returns message for non-valid target", {
  err_msg <- "target has to be a probability range excluding 0 and 1"
  object <- h_next_best_ncrm_loss()

  # Changing `target` so that it is not an interval.
  object@target <- 0.6
  expect_equal(v_next_best_ncrm_loss(object), err_msg)
  object@target <- c(0.5, 0.6, 0.8)
  expect_equal(v_next_best_ncrm_loss(object), err_msg)
  object@target <- c(0.8, 0.6)
  expect_equal(v_next_best_ncrm_loss(object), err_msg)

  # Changing `target` so that one bound is not a valid probability value.
  object@target <- c(0.4, 1)
  expect_equal(v_next_best_ncrm_loss(object), err_msg)
  object@target <- c(0, 0.9)
  expect_equal(v_next_best_ncrm_loss(object), err_msg)
})

test_that("v_next_best_ncrm_loss returns message for non-valid overdose", {
  err_msg <- "overdose has to be a probability range"
  object <- h_next_best_ncrm_loss()

  # Changing `overdose` so that it is not an interval.
  object@overdose <- 0.6
  expect_equal(v_next_best_ncrm_loss(object), err_msg)
  object@overdose <- c(0.5, 0.6, 0.8)
  expect_equal(v_next_best_ncrm_loss(object), err_msg)
  object@overdose <- c(0.8, 0.6)
  expect_equal(v_next_best_ncrm_loss(object), err_msg)

  # Changing `overdose` so that one bound is not a valid probability value.
  object@overdose <- c(-0.5, 0.3)
  expect_equal(v_next_best_ncrm_loss(object), err_msg)
})

test_that("v_next_best_ncrm_loss returns message for non-valid unacceptable", {
  err_msg <- "unacceptable has to be a probability range"
  object <- h_next_best_ncrm_loss()

  # Changing `unacceptable` so that it is not an interval.
  object@unacceptable <- 0.6
  expect_equal(v_next_best_ncrm_loss(object), err_msg)
  object@unacceptable <- c(0.5, 0.6, 0.8)
  expect_equal(v_next_best_ncrm_loss(object), err_msg)
  object@unacceptable <- c(0.8, 0.6)
  expect_equal(v_next_best_ncrm_loss(object), err_msg)

  # Changing `unacceptable` so that one bound is not a valid probability value.
  object@unacceptable <- c(-0.5, 0.3)
  expect_equal(v_next_best_ncrm_loss(object), err_msg)
})

test_that("v_next_best_ncrm_loss returns message for wrong overdose-unacceptable relation", {
  object <- h_next_best_ncrm_loss()

  # Changing `unacceptable` so that `overdose[2]` > `unacceptable[1]`.
  object@unacceptable <- c(0.34, 0.5)
  expect_equal(
    v_next_best_ncrm_loss(object),
    "lower bound of unacceptable has to be >= than upper bound of overdose"
  )
})

test_that("v_next_best_ncrm_loss returns message for wrong losses", {
  err_msg <- "losses must be a vector of non-negative numbers of length 3 if unacceptable is c(1, 1), otherwise 4"
  object <- h_next_best_ncrm_loss()

  # Changing `losses` so that it contains negative values.
  object@losses <- c(1, 2, -4, 4)
  expect_equal(v_next_best_ncrm_loss(object), err_msg)

  # Changing `losses` so that it is of wrong length.
  object@losses <- c(1, 2, 4)
  expect_equal(v_next_best_ncrm_loss(object), err_msg)

  # Changing `losses` so that it is of wrong length.
  object@unacceptable <- c(1, 1)
  object@losses <- c(1, 2, 4, 6)
  expect_equal(v_next_best_ncrm_loss(object), err_msg)
})

## v_next_best_dual_endpoint ----

test_that("v_next_best_dual_endpoint passes for valid object", {
  object <- h_next_best_dual_endpoint()
  expect_true(v_next_best_dual_endpoint(object))

  object <- h_next_best_dual_endpoint(target_relative = FALSE)
  expect_true(v_next_best_dual_endpoint(object))

  object <- h_next_best_dual_endpoint(edge_case = TRUE)
  expect_true(v_next_best_dual_endpoint(object))
})

test_that("v_next_best_dual_endpoint returns message for non-valid target (relative)", {
  err_msg <- "target has to be a probability range when target_relative is TRUE"
  object <- h_next_best_dual_endpoint(target_relative = TRUE)

  # Changing `target` so that it is not an interval.
  object@target <- 0.6
  expect_equal(v_next_best_dual_endpoint(object), err_msg)
  object@target <- c(0.5, 0.6, 0.8)
  expect_equal(v_next_best_dual_endpoint(object), err_msg)
  object@target <- c(0.8, 0.6)
  expect_equal(v_next_best_dual_endpoint(object), err_msg)

  # Changing `target` so that one bound is not a valid probability value.
  object@target <- c(0.4, 1.2)
  expect_equal(v_next_best_dual_endpoint(object), err_msg)
})

test_that("v_next_best_dual_endpoint returns message for non-valid target (absolute)", {
  err_msg <- "target must be a numeric range"
  object <- h_next_best_dual_endpoint(target_relative = FALSE)

  # Changing `target` so that it is not a numeric range.
  object@target <- 0.6
  expect_equal(v_next_best_dual_endpoint(object), err_msg)
  object@target <- c(1, 5, 7)
  expect_equal(v_next_best_dual_endpoint(object), err_msg)
  object@target <- c(0.8, 0.6)
  expect_equal(v_next_best_dual_endpoint(object), err_msg)
})

test_that("v_next_best_dual_endpoint returns message for non-valid target_relative flag", {
  object <- h_next_best_dual_endpoint()

  # Changing `target_relative` so that it is not a flag.
  object@target_relative <- c(TRUE, FALSE)
  expect_equal(
    v_next_best_dual_endpoint(object),
    "target_relative must be a flag"
  )
})

test_that("v_next_best_dual_endpoint returns message for non-valid overdose", {
  err_msg <- "overdose has to be a probability range"
  object <- h_next_best_dual_endpoint()

  # Changing `overdose` so that it is not an interval.
  object@overdose <- 0.6
  expect_equal(v_next_best_dual_endpoint(object), err_msg)
  object@overdose <- c(0.5, 0.6, 0.8)
  expect_equal(v_next_best_dual_endpoint(object), err_msg)
  object@overdose <- c(0.8, 0.6)
  expect_equal(v_next_best_dual_endpoint(object), err_msg)

  # Changing `overdose` so that one bound is not a valid probability value.
  object@overdose <- c(0.4, 1.2)
  expect_equal(v_next_best_dual_endpoint(object), err_msg)
})

test_that("v_next_best_dual_endpoint returns message for non-valid max_overdose_prob", {
  err_msg <- "max_overdose_prob must be a probability value from (0, 1) interval"
  object <- h_next_best_dual_endpoint()

  # Changing `max_overdose_prob` so that it does not represent allowed probability value.
  object@max_overdose_prob <- 1
  expect_equal(v_next_best_dual_endpoint(object), err_msg)
  object@max_overdose_prob <- 0
  expect_equal(v_next_best_dual_endpoint(object), err_msg)
  object@max_overdose_prob <- -0.5
  expect_equal(v_next_best_dual_endpoint(object), err_msg)

  # Changing `max_overdose_prob` so that it is not a scalar.
  object@max_overdose_prob <- c(0.5, 0.6)
  expect_equal(v_next_best_dual_endpoint(object), err_msg)
})

test_that("v_next_best_dual_endpoint returns message for non-valid target_thresh", {
  err_msg <- "target_thresh must be a probability value from [0, 1] interval"
  object <- h_next_best_dual_endpoint()

  # Changing `target_thresh` so that it does not represent allowed probability value.
  object@target_thresh <- 2
  expect_equal(v_next_best_dual_endpoint(object), err_msg)
  object@target_thresh <- -0.5
  expect_equal(v_next_best_dual_endpoint(object), err_msg)

  # Changing `target_thresh` so that it is not a scalar.
  object@target_thresh <- c(0.5, 0.6)
  expect_equal(v_next_best_dual_endpoint(object), err_msg)
})

## v_next_best_min_dist ----

test_that("v_next_best_min_dist passes for valid object", {
  object <- NextBestMinDist(target = 0.3)
  expect_true(v_next_best_min_dist(object))
})

test_that("v_next_best_min_dist returns message for non-valid target", {
  err_msg <- "target must be a probability value from (0, 1) interval"
  object <- NextBestMinDist(target = 0.3)

  # Changing `target` so that it does not represent allowed probability value.
  object@target <- 1
  expect_equal(v_next_best_min_dist(object), err_msg)
  object@target <- 0
  expect_equal(v_next_best_min_dist(object), err_msg)
  object@target <- -0.5
  expect_equal(v_next_best_min_dist(object), err_msg)

  # Changing `target` so that it is not a scalar.
  object@target <- c(0.5, 0.6)
  expect_equal(v_next_best_min_dist(object), err_msg)
})

## v_next_best_inf_theory ----

test_that("v_next_best_inf_theory passes for valid object", {
  object <- NextBestInfTheory(target = 0.4, asymmetry = 1.5)
  expect_true(v_next_best_inf_theory(object))
})

test_that("v_next_best_inf_theory returns message for non-valid target", {
  err_msg <- "target must be a probability value from (0, 1) interval"
  object <- NextBestInfTheory(target = 0.4, asymmetry = 1.5)

  # Changing `target` so that it does not represent allowed probability value.
  object@target <- 1
  expect_equal(v_next_best_inf_theory(object), err_msg)
  object@target <- 0
  expect_equal(v_next_best_inf_theory(object), err_msg)
  object@target <- -0.5
  expect_equal(v_next_best_inf_theory(object), err_msg)

  # Changing `target` so that it is not a scalar.
  object@target <- c(0.5, 0.6)
  expect_equal(v_next_best_inf_theory(object), err_msg)
})

test_that("v_next_best_inf_theory returns message for non-valid asymmetry", {
  err_msg <- "asymmetry must be a number from (0, 2) interval"
  object <- NextBestInfTheory(target = 0.4, asymmetry = 1.5)

  # Changing `asymmetry` so that it is outside of (0, 2).
  object@asymmetry <- 5
  expect_equal(v_next_best_inf_theory(object), err_msg)
  object@asymmetry <- 0
  expect_equal(v_next_best_inf_theory(object), err_msg)
  object@asymmetry <- 2
  expect_equal(v_next_best_inf_theory(object), err_msg)

  # Changing `asymmetry` so that it is not a scalar.
  object@asymmetry <- c(1, 1.8)
  expect_equal(v_next_best_inf_theory(object), err_msg)
})

## v_next_best_td ----

test_that("v_next_best_td passes for valid object", {
  object <- NextBestTD(0.4, 0.35)
  expect_true(v_next_best_td(object))
})

test_that("v_next_best_td returns message for non-valid prob_target_drt", {
  err_msg <- "prob_target_drt must be a probability value from (0, 1) interval"
  object <- NextBestTD(0.4, 0.35)

  # Changing `prob_target_drt` so that it does not represent allowed probability value.
  object@prob_target_drt <- 1
  expect_equal(v_next_best_td(object), err_msg)
  object@prob_target_drt <- 0
  expect_equal(v_next_best_td(object), err_msg)
  object@prob_target_drt <- -0.5
  expect_equal(v_next_best_td(object), err_msg)

  # Changing `prob_target_drt` so that it is not a scalar.
  object@prob_target_drt <- c(0.5, 0.6)
  expect_equal(v_next_best_td(object), err_msg)
})

test_that("v_next_best_td returns message for non-valid prob_target_eot", {
  err_msg <- "prob_target_eot must be a probability value from (0, 1) interval"
  object <- NextBestTD(0.4, 0.35)

  # Changing `prob_target_eot` so that it does not represent allowed probability value.
  object@prob_target_eot <- 1
  expect_equal(v_next_best_td(object), err_msg)
  object@prob_target_eot <- 0
  expect_equal(v_next_best_td(object), err_msg)
  object@prob_target_eot <- -0.5
  expect_equal(v_next_best_td(object), err_msg)

  # Changing `prob_target_eot` so that it is not a scalar.
  object@prob_target_eot <- c(0.5, 0.6)
  expect_equal(v_next_best_td(object), err_msg)
})

## v_next_best_td_samples ----

test_that("v_next_best_td_samples passes for valid object", {
  object <- h_next_best_tdsamples()
  expect_true(v_next_best_td_samples(object))
})

test_that("v_next_best_td_samples returns message for non-valid derive", {
  object <- h_next_best_tdsamples()

  # Changing `derive` so that it has many arguments.
  object@derive <- function(x, y) 1L
  expect_equal(
    v_next_best_td_samples(object),
    "derive must have a single argument"
  )

  # Changing `derive` so that it does not return a number.
  object@derive <- function(x) c(1, 2)
  expect_equal(
    v_next_best_td_samples(object),
    "derive must accept numerical vector as an argument and return a number"
  )
})

## v_next_best_max_gain_samples ----

test_that("v_next_best_max_gain_samples passes for valid object", {
  object <- h_next_best_mgsamples()
  expect_true(v_next_best_max_gain_samples(object))
})

test_that("v_next_best_max_gain_samples returns message for non-valid derive", {
  object <- h_next_best_mgsamples()

  # Changing `derive` so that it has many arguments.
  object@derive <- function(x, y) 1L
  expect_equal(
    v_next_best_max_gain_samples(object),
    "derive must have a single argument"
  )

  # Changing `derive` so that it does not return a number.
  object@derive <- function(x) c(1, 2)
  expect_equal(
    v_next_best_max_gain_samples(object),
    "derive must accept numerical vector as an argument and return a number"
  )
})

test_that("v_next_best_max_gain_samples returns message for non-valid mg_derive", {
  object <- h_next_best_mgsamples()

  # Changing `mg_derive` so that it has many arguments.
  object@mg_derive <- function(x, y) 1L
  expect_equal(
    v_next_best_max_gain_samples(object),
    "mg_derive must have a single argument"
  )

  # Changing `mg_derive` so that it does not return a number.
  object@mg_derive <- function(x) c(1, 2)
  expect_equal(
    v_next_best_max_gain_samples(object),
    "mg_derive must accept numerical vector as an argument and return a number"
  )
})

## v_next_best_prob_mtd_lte ----

test_that("v_next_best_prob_mtd_lte passes for valid object", {
  object <- NextBestProbMTDLTE(0.3)
  expect_true(v_next_best_prob_mtd_lte(object))
})

test_that("v_next_best_prob_mtd_lte returns message for non-valid target", {
  err_msg <- "target must be a probability value from (0, 1) interval"
  object <- NextBestProbMTDLTE(0.3)

  # Changing `target` so that it does not represent allowed probability value.
  object@target <- 1
  expect_equal(v_next_best_prob_mtd_lte(object), err_msg)
  object@target <- 0
  expect_equal(v_next_best_prob_mtd_lte(object), err_msg)
  object@target <- -0.5
  expect_equal(v_next_best_prob_mtd_lte(object), err_msg)

  # Changing `target` so that it is not a scalar.
  object@target <- c(0.5, 0.6)
  expect_equal(v_next_best_prob_mtd_lte(object), err_msg)
})

## v_next_best_prob_mtd_min_dist ----

test_that("v_next_best_prob_mtd_min_dist passes for valid object", {
  object <- NextBestProbMTDMinDist(0.3)
  expect_true(v_next_best_prob_mtd_min_dist(object))
})

test_that("v_next_best_prob_mtd_min_dist returns message for non-valid target", {
  err_msg <- "target must be a probability value from (0, 1) interval"
  object <- NextBestProbMTDMinDist(0.3)

  # Changing `target` so that it does not represent allowed probability value.
  object@target <- 1
  expect_equal(v_next_best_prob_mtd_min_dist(object), err_msg)
  object@target <- 0
  expect_equal(v_next_best_prob_mtd_min_dist(object), err_msg)
  object@target <- -0.5
  expect_equal(v_next_best_prob_mtd_min_dist(object), err_msg)

  # Changing `target` so that it is not a scalar.
  object@target <- c(0.5, 0.6)
  expect_equal(v_next_best_prob_mtd_min_dist(object), err_msg)
})

# Increments ----

## v_increments_relative ----

test_that("v_increments_relative passes for valid object", {
  object <- IncrementsRelative(intervals = c(0, 2), increments = c(2, 1))
  expect_true(v_increments_relative(object))
})

test_that("v_increments_relative returns message for non-valid intervals", {
  err_msg <- "intervals has to be a numerical vector with unique, finite, non-negative and sorted non-missing values"
  object <- IncrementsRelative(
    intervals = c(0, 2, 3),
    increments = c(2, 1, 1.5)
  )

  # Changing `intervals` so that it contains non-unique values.
  object@intervals <- c(1, 2, 2)
  expect_equal(v_increments_relative(object), err_msg)

  # Changing `intervals` so that it contains non-sorted values.
  object@intervals <- c(1, 3, 2)
  expect_equal(v_increments_relative(object), err_msg)

  # Changing `intervals` so that it contains missing, or infinite negative values.
  object@intervals <- c(-1, NA, 2, Inf)
  object@increments <- 1:4
  expect_equal(v_increments_relative(object), err_msg)
})

test_that("v_increments_relative returns message for non-valid increments", {
  err_msg <- "increments has to be a numerical vector of the same length as `intervals` with finite values"
  object <- IncrementsRelative(
    intervals = c(0, 2, 3),
    increments = c(2, 1, 1.5)
  )

  # Changing `increments` so that it is of a length different than the length of `intervals`.
  object@increments <- c(1, 2, 3, 4)
  expect_equal(v_increments_relative(object), err_msg)

  # Changing `increments` so that it contains missing, or infinite values.
  object@increments <- c(NA, 2, Inf)
  expect_equal(v_increments_relative(object), err_msg)
})

## v_increments_relative_parts ----

test_that("v_increments_relative_parts passes for valid object", {
  object <- IncrementsRelativeParts(dlt_start = -1L, clean_start = 3L)
  expect_true(v_increments_relative_parts(object))
})

test_that("v_increments_relative_parts returns message for non-valid dlt_start", {
  err_msg <- "dlt_start must be an integer number"
  object <- IncrementsRelativeParts(dlt_start = -1L, clean_start = 3L)

  # Changing `dlt_start` so that it not a scalar.
  object@dlt_start <- c(1L, 2L)
  expect_equal(v_increments_relative_parts(object), err_msg)

  # Changing `dlt_start` so that it is a missing object.
  object@dlt_start <- NA_integer_
  expect_equal(v_increments_relative_parts(object), err_msg)
})

test_that("v_increments_relative_parts returns message for non-valid clean_start", {
  err_msg <- "clean_start must be an integer number and it must be >= dlt_start"
  object <- IncrementsRelativeParts(dlt_start = -1L, clean_start = 1L)

  # Changing `clean_start` so that it not a scalar.
  object@clean_start <- c(1L, 2L)
  expect_equal(v_increments_relative_parts(object), err_msg)

  # Changing `clean_start` so that it is a missing object.
  object@clean_start <- NA_integer_
  expect_equal(v_increments_relative_parts(object), err_msg)

  # Changing `clean_start` so that it is less than `dlt_start`.
  object@clean_start <- -2L
  expect_equal(v_increments_relative_parts(object), err_msg)
})

## v_increments_relative_dlt ----

test_that("v_increments_relative_dlt passes for valid object", {
  object <- IncrementsRelativeDLT(intervals = c(0, 2), increments = c(2, 1))
  expect_true(v_increments_relative_dlt(object))
})

test_that("v_increments_relative_dlt returns message for non-valid intervals", {
  err_msg <- "intervals has to be an integer vector with unique, finite, non-negative and sorted non-missing values"
  object <- IncrementsRelativeDLT(
    intervals = c(0, 2, 3),
    increments = c(2, 1, 1.5)
  )

  # Changing `intervals` so that it contains non-unique values.
  object@intervals <- c(1L, 2L, 2L)
  expect_equal(v_increments_relative_dlt(object), err_msg)

  # Changing `intervals` so that it contains non-sorted values.
  object@intervals <- c(1L, 3L, 2L)
  expect_equal(v_increments_relative_dlt(object), err_msg)

  # Changing `intervals` so that it contains missing, or negative values.
  object@intervals <- c(-1L, NA_integer_, 2L)
  expect_equal(v_increments_relative_dlt(object), err_msg)
})

test_that("v_increments_relative_dlt returns message for non-valid increments", {
  err_msg <- "increments has to be a numerical vector of the same length as `intervals` with finite values"
  object <- IncrementsRelativeDLT(
    intervals = c(0, 2, 3),
    increments = c(2, 1, 1.5)
  )

  # Changing `increments` so that it is of a length different than the length of `intervals`.
  object@increments <- c(1, 2, 3, 4)
  expect_equal(v_increments_relative_dlt(object), err_msg)

  # Changing `increments` so that it contains missing, or infinite values.
  object@increments <- c(NA, 2, Inf)
  expect_equal(v_increments_relative_dlt(object), err_msg)
})

## v_increments_dose_levels ----

test_that("v_increments_dose_levels passes for valid object", {
  object <- IncrementsDoseLevels()
  expect_true(v_increments_dose_levels(object))

  object <- IncrementsDoseLevels(levels = 1, basis_level = "last")
  expect_true(v_increments_dose_levels(object))

  object <- IncrementsDoseLevels(levels = 2, basis_level = "max")
  expect_true(v_increments_dose_levels(object))
})

test_that("v_increments_dose_levels returns message for non-valid levels", {
  err_msg <- "levels must be scalar positive integer"
  object <- IncrementsDoseLevels()

  # Changing `levels` so that it not a scalar.
  object@levels <- c(1L, 2L)
  expect_equal(v_increments_dose_levels(object), err_msg)

  # Changing `levels` so that it is a missing object.
  object@levels <- NA_integer_
  expect_equal(v_increments_dose_levels(object), err_msg)

  # Changing `levels` so that it is a negative value.
  object@levels <- -2L
  expect_equal(v_increments_dose_levels(object), err_msg)
})

test_that("v_increments_dose_levels returns message for non-valid basis_level", {
  err_msg <- "basis_level must be either 'last' or 'max'"
  object <- IncrementsDoseLevels()

  # Changing `basis_level` so that it is neither equal to 'last' nor 'max'
  object@basis_level <- "last "
  expect_equal(v_increments_dose_levels(object), err_msg)
  object@basis_level <- " max "
  expect_equal(v_increments_dose_levels(object), err_msg)
  object@basis_level <- c("last", "max")
  expect_equal(v_increments_dose_levels(object), err_msg)
})

## v_increments_hsr_beta ----

test_that("v_increments_hsr_beta passes for valid object", {
  object <- IncrementsHSRBeta(target = 0.3, prob = 0.95)
  expect_true(v_increments_hsr_beta(object))

  object <- IncrementsHSRBeta(target = 0.2, prob = 0.9, a = 7, b = 3)
  expect_true(v_increments_hsr_beta(object))
})

test_that("v_increments_hsr_beta returns expected messages for non-valid target", {
  err_msg <- "target must be a probability value from (0, 1) interval"
  object <- IncrementsHSRBeta()

  # Changing `target` so that it does not represent allowed probability value.
  object@target <- 1
  expect_equal(v_increments_hsr_beta(object), err_msg)
  object@target <- 0
  expect_equal(v_increments_hsr_beta(object), err_msg)
  object@target <- -0.5
  expect_equal(v_increments_hsr_beta(object), err_msg)

  # Changing `target` so that it is not a scalar.
  object@target <- c(0.5, 0.6)
  expect_equal(v_increments_hsr_beta(object), err_msg)
})

test_that("v_increments_hsr_beta returns expected messages for non-valid prob", {
  err_msg <- "prob must be a probability value from (0, 1) interval"
  object <- IncrementsHSRBeta()

  # Changing `prob` so that it does not represent allowed probability value.
  object@prob <- 1
  expect_equal(v_increments_hsr_beta(object), err_msg)
  object@prob <- 0
  expect_equal(v_increments_hsr_beta(object), err_msg)
  object@prob <- -0.5
  expect_equal(v_increments_hsr_beta(object), err_msg)

  # Changing `prob` so that it is not a scalar.
  object@prob <- c(0.5, 0.6)
  expect_equal(v_increments_hsr_beta(object), err_msg)
})

test_that("v_increments_hsr_beta returns expected messages for non-valid beta parameters", {
  err_msg <- c(
    "Beta distribution shape parameter a must be a positive scalar",
    "Beta distribution shape parameter b must be a positive scalar"
  )
  object <- IncrementsHSRBeta()

  # Changing `a` and `b` so that they are not a positive scalars.
  object@a <- -2
  object@b <- 0
  expect_equal(v_increments_hsr_beta(object), err_msg)

  object@a <- c(1, 2)
  object@b <- c(1, 2)
  expect_equal(v_increments_hsr_beta(object), err_msg)
})

## v_increments_min ----

test_that("v_increments_min passes for valid object", {
  object <- IncrementsMin(
    increments_list = list(
      IncrementsRelativeDLT(intervals = c(0L, 1L), increments = c(2, 1)),
      IncrementsRelative(intervals = c(0, 2), increments = c(2, 1))
    )
  )
  expect_true(v_increments_min(object))
})

test_that("v_increments_min returns expected messages for non-valid object", {
  err_msg <- "all elements in increments_list must be of Increments class"
  object <- IncrementsMin(
    increments_list = list(
      IncrementsRelativeDLT(intervals = c(0L, 1L), increments = c(2, 1)),
      IncrementsRelative(intervals = c(0, 2), increments = c(2, 1))
    )
  )

  # Changing `increments_list` so that is contains objects other than `Increments`.
  object@increments_list <- list(
    IncrementsRelativeDLT(intervals = c(0L, 1L), increments = c(2, 1)),
    intervals = c(0, 2),
    increments = c(2, 1)
  )
  expect_equal(v_increments_min(object), err_msg)
})

# Stopping ----

## v_stopping_cohorts_near_dose ----

test_that("v_stopping_cohorts_near_dose passes for valid object", {
  object <- StoppingCohortsNearDose()
  expect_true(v_stopping_cohorts_near_dose(object))

  object <- StoppingCohortsNearDose(nCohorts = 5L, percentage = 40)
  expect_true(v_stopping_cohorts_near_dose(object))

  object <- StoppingCohortsNearDose(nCohorts = 5L, percentage = 0)
  expect_true(v_stopping_cohorts_near_dose(object))

  object <- StoppingCohortsNearDose(nCohorts = 5L, percentage = 100)
  expect_true(v_stopping_cohorts_near_dose(object))
})

test_that("v_stopping_cohorts_near_dose returns message for non-valid nCohorts", {
  err_msg <- "nCohorts must be positive integer scalar"
  object <- StoppingCohortsNearDose()

  # Changing `nCohorts` so that it not a scalar.
  object@nCohorts <- c(1L, 2L)
  expect_equal(v_stopping_cohorts_near_dose(object), err_msg)

  # Changing `nCohorts` so that it is NA value.
  object@nCohorts <- NA_integer_
  expect_equal(v_stopping_cohorts_near_dose(object), err_msg)

  # Changing `nCohorts` so that it is not a positive value.
  object@nCohorts <- -2L
  expect_equal(v_stopping_cohorts_near_dose(object), err_msg)
})

test_that("v_stopping_cohorts_near_dose returns message for non-valid percentage", {
  err_msg <- "percentage must be a number between 0 and 100"
  object <- StoppingCohortsNearDose()

  # Changing `percentage` so that it not a scalar.
  object@percentage <- c(1L, 2L)
  expect_equal(v_stopping_cohorts_near_dose(object), err_msg)

  # Changing `percentage` so that it is NA value.
  object@percentage <- NA_integer_
  expect_equal(v_stopping_cohorts_near_dose(object), err_msg)

  # Changing `percentage` so that it is not a percentage.
  object@percentage <- -1
  expect_equal(v_stopping_cohorts_near_dose(object), err_msg)

  # Changing `percentage` so that it is not a percentage.
  object@percentage <- 101
  expect_equal(v_stopping_cohorts_near_dose(object), err_msg)
})

## v_stopping_patients_near_dose ----

test_that("v_stopping_patients_near_dose passes for valid object", {
  object <- StoppingPatientsNearDose(nPatients = 10L)
  expect_true(v_stopping_patients_near_dose(object))

  object <- StoppingPatientsNearDose(nPatients = 5L, percentage = 40)
  expect_true(v_stopping_patients_near_dose(object))

  object <- StoppingPatientsNearDose(nPatients = 5L, percentage = 0)
  expect_true(v_stopping_patients_near_dose(object))

  object <- StoppingPatientsNearDose(nPatients = 5L, percentage = 100)
  expect_true(v_stopping_patients_near_dose(object))
})

test_that("v_stopping_patients_near_dose returns message for non-valid nPatients", {
  err_msg <- "nPatients must be positive integer scalar"
  object <- StoppingPatientsNearDose(nPatients = 5L)

  # Changing `nPatients` so that it not a scalar.
  object@nPatients <- c(1L, 2L)
  expect_equal(v_stopping_patients_near_dose(object), err_msg)

  # Changing `nPatients` so that it is NA value.
  object@nPatients <- NA_integer_
  expect_equal(v_stopping_patients_near_dose(object), err_msg)

  # Changing `nPatients` so that it is not a positive value.
  object@nPatients <- -2L
  expect_equal(v_stopping_patients_near_dose(object), err_msg)
})

test_that("v_stopping_patients_near_dose returns message for non-valid percentage", {
  err_msg <- "percentage must be a number between 0 and 100"
  object <- StoppingPatientsNearDose(nPatients = 5L)

  # Changing `percentage` so that it not a scalar.
  object@percentage <- c(1L, 2L)
  expect_equal(v_stopping_patients_near_dose(object), err_msg)

  # Changing `percentage` so that it is NA value.
  object@percentage <- NA_integer_
  expect_equal(v_stopping_patients_near_dose(object), err_msg)

  # Changing `percentage` so that it is not a percentage.
  object@percentage <- -1
  expect_equal(v_stopping_patients_near_dose(object), err_msg)

  # Changing `percentage` so that it is not a percentage.
  object@percentage <- 101
  expect_equal(v_stopping_patients_near_dose(object), err_msg)
})

## v_stopping_min_cohorts ----

test_that("v_stopping_min_cohorts passes for valid object", {
  object <- StoppingMinCohorts(nCohorts = 5L)
  expect_true(v_stopping_min_cohorts(object))
})

test_that("v_stopping_min_cohorts returns message for non-valid nCohorts", {
  err_msg <- "nCohorts must be positive integer scalar"
  object <- StoppingMinCohorts(nCohorts = 5L)

  # Changing `nCohorts` so that it not a scalar.
  object@nCohorts <- c(1L, 2L)
  expect_equal(v_stopping_min_cohorts(object), err_msg)

  # Changing `nCohorts` so that it is NA value.
  object@nCohorts <- NA_integer_
  expect_equal(v_stopping_min_cohorts(object), err_msg)

  # Changing `nCohorts` so that it is not a positive value.
  object@nCohorts <- -2L
  expect_equal(v_stopping_min_cohorts(object), err_msg)
})

## v_stopping_min_patients ----

test_that("v_stopping_min_patients passes for valid object", {
  object <- StoppingMinPatients(nPatients = 5L)
  expect_true(v_stopping_min_patients(object))
})

test_that("v_stopping_min_patients returns message for non-valid nPatients", {
  err_msg <- "nPatients must be positive integer scalar"
  object <- StoppingMinPatients(nPatients = 5L)

  # Changing `nPatients` so that it not a scalar.
  object@nPatients <- c(1L, 2L)
  expect_equal(v_stopping_min_patients(object), err_msg)

  # Changing `nPatients` so that it is NA value.
  object@nPatients <- NA_integer_
  expect_equal(v_stopping_min_patients(object), err_msg)

  # Changing `nPatients` so that it is not a positive value.
  object@nPatients <- -2L
  expect_equal(v_stopping_min_patients(object), err_msg)
})

## v_stopping_target_prob ----

test_that("v_stopping_target_prob passes for valid object", {
  object <- StoppingTargetProb(target = c(0.2, 0.35), prob = 0.4)
  expect_true(v_stopping_target_prob(object))

  object <- StoppingTargetProb(target = c(0, 1), prob = 0.4)
  expect_true(v_stopping_target_prob(object))
})

test_that("v_stopping_target_prob returns message for non-valid target", {
  err_msg <- "target has to be a probability range"
  object <- StoppingTargetProb(target = c(0.2, 0.35), prob = 0.4)

  # Changing `target` so that it is not an interval.
  object@target <- 0.6
  expect_equal(v_stopping_target_prob(object), err_msg)
  object@target <- c(0.5, 0.6, 0.8)
  expect_equal(v_stopping_target_prob(object), err_msg)
  object@target <- c(0.8, 0.6)
  expect_equal(v_stopping_target_prob(object), err_msg)

  # Changing `target` so that one bound is not a valid probability value.
  object@target <- c(0.4, 1.2)
  expect_equal(v_stopping_target_prob(object), err_msg)
})

test_that("v_stopping_target_prob returns message for non-valid prob", {
  err_msg <- "prob must be a probability value from (0, 1) interval"
  object <- StoppingTargetProb(target = c(0.2, 0.35), prob = 0.4)

  # Changing `prob` so that it does not represent allowed probability value.
  object@prob <- 1
  expect_equal(v_stopping_target_prob(object), err_msg)
  object@prob <- 0
  expect_equal(v_stopping_target_prob(object), err_msg)
  object@prob <- -0.5
  expect_equal(v_stopping_target_prob(object), err_msg)

  # Changing `prob` so that it is not a scalar.
  object@prob <- c(0.5, 0.6)
  expect_equal(v_stopping_target_prob(object), err_msg)
})

## v_stopping_mtd_distribution ----

test_that("v_stopping_mtd_distribution passes for valid object", {
  object <- StoppingMTDdistribution(target = 0.33, thresh = 0.5, prob = 0.9)
  expect_true(v_stopping_mtd_distribution(object))
})

test_that("v_stopping_mtd_distribution returns message for non-valid target", {
  err_msg <- "target must be a probability value from (0, 1) interval"
  object <- StoppingMTDdistribution(target = 0.33, thresh = 0.5, prob = 0.9)

  # Changing `target` so that it does not represent allowed probability value.
  object@target <- 1
  expect_equal(v_stopping_mtd_distribution(object), err_msg)
  object@target <- 0
  expect_equal(v_stopping_mtd_distribution(object), err_msg)
  object@target <- -0.5
  expect_equal(v_stopping_mtd_distribution(object), err_msg)

  # Changing `target` so that it is not a scalar.
  object@target <- c(0.5, 0.6)
  expect_equal(v_stopping_mtd_distribution(object), err_msg)
})

test_that("v_stopping_mtd_distribution returns message for non-valid thresh", {
  err_msg <- "thresh must be a probability value from (0, 1) interval"
  object <- StoppingMTDdistribution(target = 0.33, thresh = 0.5, prob = 0.9)

  # Changing `thresh` so that it does not represent allowed probability value.
  object@thresh <- 1
  expect_equal(v_stopping_mtd_distribution(object), err_msg)
  object@thresh <- 0
  expect_equal(v_stopping_mtd_distribution(object), err_msg)
  object@thresh <- -0.5
  expect_equal(v_stopping_mtd_distribution(object), err_msg)

  # Changing `thresh` so that it is not a scalar.
  object@thresh <- c(0.5, 0.6)
  expect_equal(v_stopping_mtd_distribution(object), err_msg)
})

test_that("v_stopping_mtd_distribution returns message for non-valid prob", {
  err_msg <- "prob must be a probability value from (0, 1) interval"
  object <- StoppingMTDdistribution(target = 0.33, thresh = 0.5, prob = 0.9)

  # Changing `prob` so that it does not represent allowed probability value.
  object@prob <- 1
  expect_equal(v_stopping_mtd_distribution(object), err_msg)
  object@prob <- 0
  expect_equal(v_stopping_mtd_distribution(object), err_msg)
  object@prob <- -0.5
  expect_equal(v_stopping_mtd_distribution(object), err_msg)

  # Changing `prob` so that it is not a scalar.
  object@prob <- c(0.5, 0.6)
  expect_equal(v_stopping_mtd_distribution(object), err_msg)
})

## v_stopping_mtd_cv ----

test_that("v_stopping_mtd_cv passes for valid object", {
  object <- StoppingMTDCV(target = 0.3, thresh_cv = 30)
  expect_true(v_stopping_mtd_cv(object))

  object <- StoppingMTDCV(target = 0.3, thresh_cv = 100)
  expect_true(v_stopping_mtd_cv(object))
})

test_that("v_stopping_mtd_cv returns message for non-valid target", {
  err_msg <- "target must be probability value from (0, 1) interval"
  object <- StoppingMTDCV(target = 0.3, thresh_cv = 30)

  # Changing `target` so that it does not represent allowed probability value.
  object@target <- 1
  expect_equal(v_stopping_mtd_cv(object), err_msg)
  object@target <- 0
  expect_equal(v_stopping_mtd_cv(object), err_msg)
  object@target <- -0.5
  expect_equal(v_stopping_mtd_cv(object), err_msg)

  # Changing `target` so that it is not a scalar.
  object@target <- c(0.5, 0.6)
  expect_equal(v_stopping_mtd_cv(object), err_msg)
})

test_that("v_stopping_mtd_cv returns message for non-valid thresh_cv", {
  err_msg <- "thresh_cv must be percentage > 0"
  object <- StoppingMTDCV(target = 0.3, thresh_cv = 30)

  # Changing `thresh_cv` so that it not a scalar.
  object@thresh_cv <- c(1L, 2L)
  expect_equal(v_stopping_mtd_cv(object), err_msg)

  # Changing `thresh_cv` so that it is NA value.
  object@thresh_cv <- NA_integer_
  expect_equal(v_stopping_mtd_cv(object), err_msg)

  # Changing `thresh_cv` so that it is not a thresh_cv.
  object@thresh_cv <- -1
  expect_equal(v_stopping_mtd_cv(object), err_msg)
  object@thresh_cv <- 0
  expect_equal(v_stopping_mtd_cv(object), err_msg)
  object@thresh_cv <- 101
  expect_equal(v_stopping_mtd_cv(object), err_msg)
})

## v_stopping_target_biomarker ----

test_that("v_stopping_target_biomarker passes for valid object", {
  object <- StoppingTargetBiomarker(c(0.85, 1), 0.4)
  expect_true(v_stopping_target_biomarker(object))

  object <- StoppingTargetBiomarker(c(0, 0.6), 0.4)
  expect_true(v_stopping_target_biomarker(object))

  object <- StoppingTargetBiomarker(c(2, 3), 0.4, FALSE)
  expect_true(v_stopping_target_biomarker(object))
})

test_that("v_stopping_target_biomarker returns expected messages for non-valid target (relative)", {
  err_msg <- "target has to be a probability range when is_relative flag is 'TRUE'"
  object <- StoppingTargetBiomarker(c(0.85, 1), 0.4)

  # Changing `target` so that it is not an interval.
  object@target <- 0.6
  expect_equal(v_stopping_target_biomarker(object), err_msg)
  object@target <- c(0.5, 0.6, 0.8)
  expect_equal(v_stopping_target_biomarker(object), err_msg)
  object@target <- c(0.8, 0.6)
  expect_equal(v_stopping_target_biomarker(object), err_msg)

  # Changing `target` so that one bound is not a valid probability value.
  object@target <- c(0.4, 1.2)
  expect_equal(v_stopping_target_biomarker(object), err_msg)
})

test_that("v_stopping_target_biomarker returns expected messages for non-valid target (absolute)", {
  err_msg <- "target must be a numeric range"
  object <- StoppingTargetBiomarker(c(0.85, 1), 0.4, FALSE)

  # Changing `target` so that it is not an interval.
  object@target <- 0.6
  expect_equal(v_stopping_target_biomarker(object), err_msg)
  object@target <- c(0.5, 0.6, 0.8)
  expect_equal(v_stopping_target_biomarker(object), err_msg)
  object@target <- c(0.8, 0.6)
  expect_equal(v_stopping_target_biomarker(object), err_msg)
})

test_that("v_stopping_target_biomarker returns expected messages for non-valid is_relative", {
  err_msg <- "is_relative must be a flag"
  object <- StoppingTargetBiomarker(c(0.85, 1), 0.4)

  # Changing `is_relative` so that it is not a flag.
  object@is_relative <- c(TRUE, TRUE)
  expect_equal(v_stopping_target_biomarker(object), err_msg)
  object@is_relative <- c(TRUE, FALSE)
  expect_equal(v_stopping_target_biomarker(object), err_msg)
})

test_that("v_stopping_target_biomarker returns expected messages for non-valid prob", {
  err_msg <- "prob must be a probability value from (0, 1) interval"
  object <- StoppingTargetBiomarker(c(0.85, 1), 0.4)

  # Changing `prob` so that it does not represent allowed probability value.
  object@prob <- 1
  expect_equal(v_stopping_target_biomarker(object), err_msg)
  object@prob <- 0
  expect_equal(v_stopping_target_biomarker(object), err_msg)
  object@prob <- -0.5
  expect_equal(v_stopping_target_biomarker(object), err_msg)

  # Changing `prob` so that it is not a scalar.
  object@prob <- c(0.5, 0.6)
  expect_equal(v_stopping_target_biomarker(object), err_msg)
})

## v_stopping_list ----

test_that("v_stopping_list passes for valid object", {
  object <- h_stopping_list()
  expect_true(v_stopping_list(object))
})

test_that("v_stopping_list returns expected messages for non-valid stop_list", {
  err_msg <- "every stop_list element must be of class 'Stopping'"
  object <- h_stopping_list()

  # Changing `stop_list` so that not all of its elements are of class `Stopping`.
  object@stop_list <- list(object@stop_list[[1]], TRUE)
  expect_equal(v_stopping_list(object), err_msg)
  object@stop_list <- list(FALSE, TRUE)
  expect_equal(v_stopping_list(object), err_msg)
})

test_that("v_stopping_list returns expected messages for non-valid summary (args)", {
  err_msg <- "summary must be a function that accepts a single argument, without ..."
  object <- h_stopping_list()

  # Changing `summary` so that it has more than 1 or no arguments.
  object@summary <- function(x, y) {
    TRUE
  }
  expect_equal(v_stopping_list(object), err_msg)
  object@summary <- function() {
    TRUE
  }
  expect_equal(v_stopping_list(object), err_msg)
  object@summary <- function(...) {
    TRUE
  }
  expect_equal(v_stopping_list(object), err_msg)
})

test_that("v_stopping_list returns expected messages for non-valid summary (output)", {
  err_msg <- "summary must accept a logical vector of the same length as 'stop_list' and return a boolean value"
  object <- h_stopping_list()

  # Changing `summary` so that it does not return a flag.
  object@summary <- function(x) {
    c(TRUE, FALSE)
  }
  expect_equal(v_stopping_list(object), err_msg)
  object@summary <- function(x) {
    c(TRUE, FALSE, TRUE)
  }
  expect_equal(v_stopping_list(object), err_msg)
})

## v_stopping_all ----

test_that("v_stopping_all passes for valid object", {
  object <- StoppingAll(
    stop_list = list(
      StoppingMinCohorts(nCohorts = 3),
      StoppingTargetProb(target = c(0.2, 0.35), prob = 0.5),
      StoppingMinPatients(nPatients = 20)
    )
  )
  expect_true(v_stopping_all(object))
})

test_that("v_stopping_all returns expected messages for non-valid stop_list", {
  err_msg <- "every stop_list element must be of class 'Stopping'"
  object <- StoppingAll(
    stop_list = list(
      StoppingMinCohorts(nCohorts = 3),
      StoppingTargetProb(target = c(0.2, 0.35), prob = 0.5),
      StoppingMinPatients(nPatients = 20)
    )
  )

  # Changing `stop_list` so that not all of its elements are of class `Stopping`.
  object@stop_list <- list(object@stop_list[[1]], TRUE)
  expect_equal(v_stopping_all(object), err_msg)
  object@stop_list <- list(FALSE, TRUE)
  expect_equal(v_stopping_all(object), err_msg)
})

## v_stopping_tdci_ratio ----

test_that("v_stopping_tdci_ratio passes for valid object", {
  object <- StoppingTDCIRatio(target_ratio = 7, prob_target = 0.2)
  expect_true(v_stopping_tdci_ratio(object))

  object <- StoppingTDCIRatio(target_ratio = 0.2, prob_target = 0)
  expect_true(v_stopping_tdci_ratio(object))

  object <- StoppingTDCIRatio(target_ratio = 6, prob_target = 1)
  expect_true(v_stopping_tdci_ratio(object))
})

test_that("v_stopping_tdci_ratio returns message for non-valid target_ratio", {
  err_msg <- "target_ratio must be a positive number"
  object <- StoppingTDCIRatio(target_ratio = 7, prob_target = 0.2)

  # Changing `target_ratio` so that it does not a positive number.
  object@target_ratio <- -0.5
  expect_equal(v_stopping_tdci_ratio(object), err_msg)
  object@target_ratio <- 0
  expect_equal(v_stopping_tdci_ratio(object), err_msg)

  # Changing `target_ratio` so that it is not a scalar.
  object@target_ratio <- c(0.5, 0.6)
  expect_equal(v_stopping_tdci_ratio(object), err_msg)
})

test_that("v_stopping_tdci_ratio returns message for non-valid prob_target", {
  err_msg <- "prob_target must be a probability value from [0, 1] interval"
  object <- StoppingTDCIRatio(target_ratio = 7, prob_target = 0.2)

  # Changing `prob_target` so that it does not represent allowed probability value.
  object@prob_target <- 2
  expect_equal(v_stopping_tdci_ratio(object), err_msg)
  object@prob_target <- -0.5
  expect_equal(v_stopping_tdci_ratio(object), err_msg)

  # Changing `prob_target` so that it is not a scalar.
  object@prob_target <- c(0.5, 0.6)
  expect_equal(v_stopping_tdci_ratio(object), err_msg)
})

# CohortSize ----

## v_cohort_size_range ----

test_that("v_cohort_size_range passes for valid object", {
  object <- CohortSizeRange(0, 20)
  expect_true(v_cohort_size_range(object))

  object <- CohortSizeRange(c(0, 30), c(20, 60))
  expect_true(v_cohort_size_range(object))

  object <- CohortSizeRange(c(20, 40, 90), c(50, 160, 400))
  expect_true(v_cohort_size_range(object))
})

test_that("v_cohort_size_range returns message for non-valid intervals", {
  err_msg <- "intervals must be a numeric vector with non-negative, sorted (asc.) and unique values"
  object <- CohortSizeRange(c(0, 30), c(20, 60))

  # Changing `intervals` so that it contains a non-unique values
  object@intervals <- c(10, 10)
  expect_equal(v_cohort_size_range(object), err_msg)

  # Changing `intervals` so that it contains not allowed elements or it is not sorted.
  object@intervals <- c(0, -30)
  expect_equal(v_cohort_size_range(object), err_msg)
  object@intervals <- c(20, Inf)
  expect_equal(v_cohort_size_range(object), err_msg)
  object@intervals <- c(NA, 30)
  expect_equal(v_cohort_size_range(object), err_msg)
  object@intervals <- -0.5
  object@cohort_size <- 20L
  expect_equal(v_cohort_size_range(object), err_msg)

  # Changing `intervals` so that its length is not >= 1.
  object@intervals <- numeric(0)
  object@cohort_size <- integer(0)
  expect_equal(v_cohort_size_range(object), err_msg)
})

test_that("v_cohort_size_range returns message for non-valid cohort_size", {
  errmsg <- "cohort_size must be an integer vector of the same length as intervals, containing non-negative values only"
  object <- CohortSizeRange(c(0, 30), c(20, 60))

  # Changing `cohort_size` so that its length is not equal to the length of `intervals`.
  object@cohort_size <- c(20L, 60L, 90L)
  expect_equal(v_cohort_size_range(object), errmsg)

  # Changing `cohort_size` so that it contains not allowed elements.
  object@cohort_size <- c(0L, -30L)
  expect_equal(v_cohort_size_range(object), errmsg)
  object@cohort_size <- c(NA, 30L)
  expect_equal(v_cohort_size_range(object), errmsg)
  object@cohort_size <- -20L
  object@intervals <- 0
  expect_equal(v_cohort_size_range(object), errmsg)
})

## v_cohort_size_dlt ----

test_that("v_cohort_size_dlt passes for valid object", {
  object <- CohortSizeDLT(0, 20)
  expect_true(v_cohort_size_dlt(object))

  object <- CohortSizeDLT(c(0, 1), c(20, 60))
  expect_true(v_cohort_size_dlt(object))

  object <- CohortSizeDLT(c(0, 1, 3), c(50, 160, 400))
  expect_true(v_cohort_size_dlt(object))
})

test_that("v_cohort_size_dlt returns message for non-valid intervals", {
  err_msg <- "intervals must be an integer vector with non-negative, sorted (asc.) and unique values"
  object <- CohortSizeDLT(c(0, 1), c(20, 60))

  # Changing `intervals` so that it contains a non-unique values
  object@intervals <- c(10L, 10L)
  expect_equal(v_cohort_size_dlt(object), err_msg)

  # Changing `intervals` so that it contains not allowed elements or it is not sorted.
  object@intervals <- c(0L, -30L)
  expect_equal(v_cohort_size_dlt(object), err_msg)
  object@intervals <- c(NA, 30L)
  expect_equal(v_cohort_size_dlt(object), err_msg)
  object@intervals <- -5L
  object@cohort_size <- 20L
  expect_equal(v_cohort_size_dlt(object), err_msg)

  # Changing `intervals` so that its length is not >= 1.
  object@intervals <- integer(0)
  object@cohort_size <- integer(0)
  expect_equal(v_cohort_size_dlt(object), err_msg)
})

test_that("v_cohort_size_dlt returns message for non-valid cohort_size", {
  errmsg <-
    "cohort_size must be an integer vector of the same length as intervals, containing non-negative values only"
  object <- CohortSizeDLT(c(0, 1), c(20, 60))

  # Changing `cohort_size` so that its length is not equal to the length of `intervals`.
  object@cohort_size <- c(20L, 60L, 90L)
  expect_equal(v_cohort_size_dlt(object), errmsg)

  # Changing `cohort_size` so that it contains not allowed elements.
  object@cohort_size <- c(0L, -30L)
  expect_equal(v_cohort_size_dlt(object), errmsg)
  object@cohort_size <- c(NA, 30L)
  expect_equal(v_cohort_size_dlt(object), errmsg)
  object@cohort_size <- -20L
  object@intervals <- 0L
  expect_equal(v_cohort_size_dlt(object), errmsg)
})

## v_cohort_size_const ----

test_that("v_cohort_size_const passes for valid object", {
  object <- CohortSizeConst(0)
  expect_true(v_cohort_size_const(object))

  object <- CohortSizeConst(5)
  expect_true(v_cohort_size_const(object))
})

test_that("v_cohort_size_const returns message for non-valid size", {
  err_msg <- "size needs to be a non-negative scalar"
  object <- CohortSizeConst(5)

  # Changing `size` so that it is not allowed value.
  object@size <- -(5L)
  expect_equal(v_cohort_size_const(object), err_msg)
  object@size <- NA_integer_
  expect_equal(v_cohort_size_const(object), err_msg)

  # Changing `size` so that it is not a scalar.
  object@size <- c(2L, 4L)
  expect_equal(v_cohort_size_const(object), err_msg)
})

## v_cohort_size_parts ----

test_that("v_cohort_size_parts passes for valid object", {
  object <- CohortSizeParts(c(1, 4))
  expect_true(v_cohort_size_parts(object))

  object <- CohortSizeParts(c(9, 4))
  expect_true(v_cohort_size_parts(object))
})

test_that("v_cohort_size_parts returns message for non-valid cohort_sizes", {
  err_msg <- "cohort_sizes needs to be an integer vector of length 2 with all elements positive"
  object <- CohortSizeParts(c(1L, 4L))

  # Changing `cohort_sizes` so that it is not of length 2.
  object@cohort_sizes <- c(1L, 4L, 7L)
  expect_equal(v_cohort_size_parts(object), err_msg)
  object@cohort_sizes <- 2L
  expect_equal(v_cohort_size_parts(object), err_msg)
  object@cohort_sizes <- integer(0)
  expect_equal(v_cohort_size_parts(object), err_msg)

  # Changing `cohort_sizes` so that it contains not allowed elements.
  object@cohort_sizes <- c(0L, 4L)
  expect_equal(v_cohort_size_parts(object), err_msg)
  object@cohort_sizes <- c(1L, -30L)
  expect_equal(v_cohort_size_parts(object), err_msg)
  object@cohort_sizes <- c(NA, 30L)
  expect_equal(v_cohort_size_parts(object), err_msg)
  object@cohort_sizes <- -20L
  expect_equal(v_cohort_size_parts(object), err_msg)
})

## v_cohort_size_max ----

test_that("v_cohort_size_max passes for valid object", {
  object <- CohortSizeMax(h_cohort_sizes())
  expect_true(v_cohort_size_max(object))

  object <- CohortSizeMax(h_cohort_sizes(three_rules = TRUE))
  expect_true(v_cohort_size_max(object))
})

test_that("v_cohort_size_parts returns message for non-valid sizes", {
  err_msg <- "cohort_sizes must be a list of CohortSize (unique) objects only and be of length >= 2"
  cohort_sizes <- h_cohort_sizes()
  object <- CohortSizeMax(cohort_sizes)

  # Changing `cohort_sizes` so that it does not contain `CohortSize` objects only.
  object@cohort_sizes <- list(3, 5)
  expect_equal(v_cohort_size_max(object), err_msg)
  object@cohort_sizes <- list(cohort_sizes[[1]], 5L)
  expect_equal(v_cohort_size_max(object), err_msg)
  object@cohort_sizes <- list(cohort_sizes[[1]], NA)
  expect_equal(v_cohort_size_max(object), err_msg)
  object@cohort_sizes <- list()
  expect_equal(v_cohort_size_max(object), err_msg)

  # Changing `cohort_sizes` so that it contains non-unique `CohortSize` objects.
  object@cohort_sizes <- list(cohort_sizes[[1]], cohort_sizes[[1]])
  expect_equal(v_cohort_size_max(object), err_msg)

  # Changing `cohort_sizes` so that it is not of length >=2.
  object@cohort_sizes <- list(cohort_sizes[[1]])
  expect_equal(v_cohort_size_max(object), err_msg)
})

# SafetyWindowSize ----

## v_safety_window_size ----

test_that("v_safety_window_size passes for valid object", {
  object <- h_safety_window_size()
  expect_true(v_safety_window_size(object))

  object <- h_safety_window_size(three_cohorts = TRUE)
  expect_true(v_safety_window_size(object))
})

test_that("v_safety_window_size returns message for non-valid gap", {
  err_msg1 <- "gap must be a list of length >= 1 with integer vectors only"
  err_msg2 <- "every element in gap list has to be an integer vector with non-negative and non-missing values"
  object <- h_safety_window_size()

  # Changing `gap` so that it not a list of integers.
  object@gap <- c(object@gap[-2], list(c(4, 6)))
  expect_equal(v_safety_window_size(object), c(err_msg1, err_msg2))

  # Changing `gap` so that it not a list of non-negative integers.
  object@gap <- c(object@gap[-2], list(c(4L, -(5L))))
  expect_equal(v_safety_window_size(object), c(err_msg2))
  object@gap <- c(object@gap[-2], list(integer(0)))
  expect_equal(v_safety_window_size(object), c(err_msg2))
  object@gap <- c(object@gap[-2], list(NA_integer_))
  expect_equal(v_safety_window_size(object), c(err_msg2))

  # Changing `gap` so that it not a list of length >= 1.
  object@gap <- list()
  object@size <- integer()
  expect_equal(v_safety_window_size(object), err_msg1)
})

test_that("v_safety_window_size returns message for non-valid size", {
  err_msg <- "size has to be an integer vector, of the same length as gap, with positive, unique and sorted non-missing values" # nolinter
  object <- h_safety_window_size()

  # Changing `size` so that it contains not allowed elements.
  object@size <- c(0L, 4L)
  expect_equal(v_safety_window_size(object), err_msg)
  object@size <- c(1L, -30L)
  expect_equal(v_safety_window_size(object), err_msg)
  object@size <- c(NA, 30L)
  expect_equal(v_safety_window_size(object), err_msg)
  object@size <- c(2L, 1L)
  expect_equal(v_safety_window_size(object), err_msg)
  object@size <- c(1L, 1L)
  expect_equal(v_safety_window_size(object), err_msg)

  # Changing `size` so that it not of the same length as `gap`.
  object@size <- 1L
  expect_equal(v_safety_window_size(object), err_msg)
})

test_that("v_safety_window_size returns message for non-valid follow", {
  err_msg <- "follow has to be a positive integer number"
  object <- h_safety_window_size()

  # Changing `follow` so that it is not a valid integer scalar.
  object@follow <- 0L
  expect_equal(v_safety_window_size(object), err_msg)
  object@follow <- -1L
  expect_equal(v_safety_window_size(object), err_msg)
  object@follow <- c(1L, 2L)
  expect_equal(v_safety_window_size(object), err_msg)
  object@follow <- NA_integer_
  expect_equal(v_safety_window_size(object), err_msg)
})

test_that("v_safety_window_size returns message for non-valid follow_min", {
  err_msg <- "follow_min has to be a positive integer number"
  object <- h_safety_window_size()

  # Changing `follow_min` so that it is not a valid integer scalar.
  object@follow_min <- 0L
  expect_equal(v_safety_window_size(object), err_msg)
  object@follow_min <- -1L
  expect_equal(v_safety_window_size(object), err_msg)
  object@follow_min <- c(1L, 2L)
  expect_equal(v_safety_window_size(object), err_msg)
  object@follow_min <- NA_integer_
  expect_equal(v_safety_window_size(object), err_msg)
})

# SafetyWindowConst ----

## v_safety_window_const ----

test_that("v_safety_window_const passes for valid object", {
  object <- SafetyWindowConst(8, 2, 18)
  expect_true(v_safety_window_const(object))

  object <- SafetyWindowConst(0, 2, 18)
  expect_true(v_safety_window_const(object))

  object <- SafetyWindowConst(c(2, 5), 2, 18)
  expect_true(v_safety_window_const(object))
})

test_that("v_safety_window_const returns message for non-valid gap", {
  err_msg <- "gap has to be an integer vector with non-negative and non-missing elements"
  object <- SafetyWindowConst(8, 2, 18)

  # Changing `gap` so that it is not a valid integer scalar.
  object@gap <- -1L
  expect_equal(v_safety_window_const(object), err_msg)
  object@gap <- c(1L, -2L)
  expect_equal(v_safety_window_const(object), err_msg)
  object@gap <- NA_integer_
  expect_equal(v_safety_window_const(object), err_msg)
  object@gap <- c(2L, NA_integer_)
  expect_equal(v_safety_window_const(object), err_msg)
})

test_that("v_safety_window_const returns message for non-valid follow", {
  err_msg <- "follow has to be a positive integer number"
  object <- SafetyWindowConst(8, 2, 18)

  # Changing `follow` so that it is not a valid integer scalar.
  object@follow <- 0L
  expect_equal(v_safety_window_const(object), err_msg)
  object@follow <- -1L
  expect_equal(v_safety_window_const(object), err_msg)
  object@follow <- c(1L, 2L)
  expect_equal(v_safety_window_const(object), err_msg)
  object@follow <- NA_integer_
  expect_equal(v_safety_window_const(object), err_msg)
})

test_that("v_safety_window_const returns message for non-valid follow_min", {
  err_msg <- "follow_min has to be a positive integer number"
  object <- SafetyWindowConst(8, 2, 18)

  # Changing `follow_min` so that it is not a valid integer scalar.
  object@follow_min <- 0L
  expect_equal(v_safety_window_const(object), err_msg)
  object@follow_min <- -1L
  expect_equal(v_safety_window_const(object), err_msg)
  object@follow_min <- c(1L, 2L)
  expect_equal(v_safety_window_const(object), err_msg)
  object@follow_min <- NA_integer_
  expect_equal(v_safety_window_const(object), err_msg)
})

test_that("v_increments_maxtoxprob validates correctly", {
  expect_no_error({
    x <- IncrementsMaxToxProb(c("DLAE" = 0.3, "DLT" = 0.1))
  })

  expect_error({
    x <- IncrementsMaxToxProb(NA)
  })

  expect_error({
    x <- IncrementsMaxToxProb(c(0.3, NA))
  })

  expect_error({
    x <- IncrementsMaxToxProb(c(-1, 0.2))
  })

  expect_error({
    x <- IncrementsMaxToxProb(c(0.2, 3))
  })
})

test_that("v_nextbest_ordinal validates correctly", {
  expect_no_error({
    x <- NextBestOrdinal(
      grade = 1L,
      rule = NextBestMTD(target = 0.3, derive = mean)
    )
  })

  expect_error(
    {
      x <- NextBestOrdinal(
        grade = pi,
        rule = NextBestMTD(target = 0.3, derive = mean)
      )
    },
    "grade must be a positive integer"
  )
  expect_error(
    {
      x <- NextBestOrdinal(
        grade = -2,
        rule = NextBestMTD(target = 0.3, derive = mean)
      )
    },
    "grade must be a positive integer"
  )

  expect_error(
    {
      x <- NextBestOrdinal(grade = 1L, rule = CohortSizeConst(3))
    },
    paste0(
      "invalid class \"NextBestOrdinal\" object: invalid object for slot \"rule\"",
      " in class \"NextBestOrdinal\": got class \"CohortSizeConst\", should be or ",
      "extend class \"NextBest\""
    )
  )
})