test_that("set_transfer default handler", {
  expect_error(new("EffectScenario") %>% set_transfer(interval=1), "not support")
  expect_error("foo" %>% set_transfer(interval=1), "not support")
})

test_that("set_transfer interval", {
  # no transfer
  Lemna_Schmitt() %>% set_transfer(interval=-1) -> sc
  expect_equal(sc@transfer.interval, -1)
  expect_equal(sc@transfer.times, numeric(0))

  ## transfer interval
  Lemna_Schmitt() %>% set_transfer(interval=5) -> sc
  expect_equal(sc@transfer.interval, 5)
  expect_equal(sc@transfer.times, numeric(0))

  ## transfer times
  Lemna_Schmitt() %>% set_transfer(times=seq(5)) -> sc
  expect_equal(sc@transfer.interval, -1)
  expect_equal(sc@transfer.times, seq(5))
  # auto-ordering of times
  Lemna_Schmitt() %>% set_transfer(times=c(1,5,2)) -> sc
  expect_equal(sc@transfer.times, c(1,2,5))

  # using interval and times in conjunction
  Lemna_Schmitt() %>% set_transfer(interval=-2, times=c(1)) -> sc
  expect_equal(sc@transfer.interval, -1)
  expect_equal(sc@transfer.times, c(1))
  Lemna_Schmitt() %>% set_transfer(interval=1, times=c()) -> sc
  expect_equal(sc@transfer.interval, 1)
  expect_equal(sc@transfer.times, numeric(0))

  # re-setting options
  Lemna_Schmitt() %>%
    set_transfer(interval=5) %>%
    set_transfer(times=seq(5)) -> sc
  expect_equal(sc@transfer.interval, -1)
  expect_equal(sc@transfer.times, seq(5))

  Lemna_Schmitt() %>%
    set_transfer(times=seq(5)) %>%
    set_transfer(interval=5) -> sc
  expect_equal(sc@transfer.interval, 5)
  expect_equal(sc@transfer.times, numeric(0))
})

test_that("set_transfer biomass", {
  ## biomass
  Lemna_Schmitt() %>% set_transfer(biomass=23) -> sc
  expect_equal(sc@transfer.biomass, 23)
  # one biomass amount for each transfer
  Lemna_Schmitt() %>% set_transfer(times=0:2, biomass=1:3) -> sc
  expect_equal(sc@transfer.biomass, 1:3)

  ## compartments
  Lemna_Schmitt() %>%
    set_transfer(scaled_comp=c("E","M_int")) -> sc
  expect_equal(sc@transfer.comp.scaled, c("E","M_int"))
  Lemna_Schmitt() %>%
    set_transfer(scaled_comp=c("E")) %>%
    set_transfer(scaled_comp=c("M_int")) -> sc
  expect_equal(sc@transfer.comp.scaled, c("M_int"))

  # setting all at once
  Lemna_Schmitt() %>%
    set_transfer(interval=-2, times=c(1,2), biomass=c(3,4), scaled_comp="E") -> sc
  expect_equal(sc@transfer.interval, -1)
  expect_equal(sc@transfer.times, c(1,2))
  expect_equal(sc@transfer.biomass, c(3,4))
  expect_equal(sc@transfer.comp.scaled, "E")
})

test_that("set_transfer invalid arguments", {
  sc <- Lemna_Schmitt()
  # invalid inputs
  expect_error(set_transfer(sc, interval=NA), "numeric")
  expect_error(set_transfer(sc, interval=2, times=2), "cannot be used")
  expect_error(set_transfer(sc, times=c(2,NA,3)), "invalid value")
  expect_error(set_transfer(sc, times=1, biomass="foo"), "invalid value")
  expect_error(set_transfer(sc, times=1, biomass=c(1, NA_real_)), "invalid value")
  expect_error(set_transfer(sc, times=1, biomass=1:3), "length of")
  expect_error(set_transfer(sc, interval=1, biomass=1:3), "length of")
  # invalid object state
  expect_error(set_transfer(sc, interval=1, scaled_comp=character(0)), "not be empty")
  expect_error(set_transfer(sc, interval=1, scaled_comp="foo"), "state variables")
  sc2 <- sc
  sc2@transfer.comp.biomass <- NA_character_
  expect_error(set_transfer(sc2, interval=1), "biomass state variable.*not set")
  sc2@transfer.comp.biomass <- character(0)
  expect_error(set_transfer(sc2, interval=1), "biomass state variable.*length 1")
})

test_that("set_notransfer", {
  tr <- Lemna_Schmitt() %>% set_transfer(interval=5)

  # single scenario
  expect_false(has_transfer(tr %>% set_notransfer()))
  # multiple scenarios
  expect_equal(has_transfer(list(tr, tr) %>% set_notransfer()), c(FALSE, FALSE))
})