if (!.Call(`_rxode2_isIntel`)) {
  test_that("as.model expression", {

    is.model <- function(x) {
      expect_true(is.call(x))
      expect_true(identical(x[[1]], quote(`model`)))
    }

    model <- quote(model({
      ka <- exp(tka + eta.ka)
      cl <- exp(tcl + eta.cl)
      v <- exp(tv + eta.v)
      d/dt(depot) = -ka * depot
      d/dt(center) = ka * depot - cl / v * center
      cp = center / v
      cp ~ add(add.sd)
    }))

    is.model(as.model(model))

    one.compartment <- function() {
      ini({
        tka <- log(1.57)
        tcl <- log(2.72)
        tv <- log(31.5)
        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)
        d/dt(depot) = -ka * depot
        d/dt(center) = ka * depot - cl / v * center
        cp = center / v
        cp ~ add(add.sd)
      })
    }

    is.model(as.model(one.compartment))

    ui <- one.compartment()

    is.model(as.model(ui))

    model <- c("model({",
               "ka <- exp(tka + eta.ka)",
               "cl <- exp(tcl + eta.cl)",
               "v <- exp(tv + eta.v)",
               "d/dt(depot) = -ka * depot",
               "d/dt(center) = ka * depot - cl / v * center",
               "cp = center / v",
               "cp ~ add(add.sd)",
               "})")

    is.model(as.model(model))

    model <- paste(model, collapse="\n")

    is.model(as.model(model))

  })
}