test_that("test $simulationModelIwres with multiple endpoints", {
  skip_on_cran()
  pk.turnover.emax3 <- function() {
    ini({
      tktr <- log(1)
      tka <- log(1)
      tcl <- log(0.1)
      tv <- log(10)
      ##
      eta.ktr ~ 1
      eta.ka ~ 1
      eta.cl ~ 2
      eta.v ~ 1
      prop.err <- 0.1
      pkadd.err <- 0.1
      ##
      temax <- logit(0.8)
      tec50 <- log(0.5)
      tkout <- log(0.05)
      te0 <- log(100)
      ##
      eta.emax ~ .5
      eta.ec50  ~ .5
      eta.kout ~ .5
      eta.e0 ~ .5
      ##
      pdadd.err <- 10
    })
    model({
      ktr <- exp(tktr + eta.ktr)
      ka <- exp(tka + eta.ka)
      cl <- exp(tcl + eta.cl)
      v <- exp(tv + eta.v)
      emax = expit(temax+eta.emax)
      ec50 =  exp(tec50 + eta.ec50)
      kout = exp(tkout + eta.kout)
      e0 = exp(te0 + eta.e0)
      ##
      DCP = center/v
      PD=1-emax*DCP/(ec50+DCP)
      ##
      effect(0) = e0
      kin = e0*kout
      ##
      d/dt(depot) = -ktr * depot
      d/dt(gut) =  ktr * depot -ka * gut
      d/dt(center) =  ka * gut - cl / v * center
      d/dt(effect) = kin*PD -kout*effect
      ##
      cp = center / v
      cp ~ prop(prop.err) + add(pkadd.err)
      effect ~ add(pdadd.err) | pca
    })
  }

  mod <- pk.turnover.emax3()

  expect_true(inherits(mod$simulationModelIwres, "rxode2"))
})

test_that("test $simulationModelIwres with single endpoints", {
  skip_on_cran()
  one.cmt <- function() {
    ini({
      ## You may label each parameter with a comment
      tka <- 0.45 # Ka
      tcl <- log(c(0, 2.7, 100)) # Log Cl
      ## This works with interactive models
      ## You may also label the preceding line with label("label text")
      tv <- 3.45; label("log V")
      ## the label("Label name") works with all models
      eta.ka ~ 0.6
      eta.cl ~ 0.3
      eta.v ~ 0.1
      add.sd <- 0.7
    })
    model({
      ka <- exp(tka + eta.ka)
      cl <- exp(tcl + eta.cl)
      v <- exp(tv + eta.v)
      linCmt() ~ add(add.sd)
    })
  }

  mod <- one.cmt()
  
  expect_true(inherits(mod$simulationModelIwres, "rxode2"))
})