rxTest({
  test_that("nopred ui", {
    pheno2 <- function() {
      ini({
        tcl <- log(0.008)
        tv <-  log(0.6)
        eta.cl + eta.v ~ c(1,
                           0.01, 1)
      })
      model({
        cl <- exp(tcl + eta.cl) # individual value of clearance
        v <- exp(tv + eta.v)    # individual value of volume
        ke <- cl / v            # elimination rate constant
        d/dt(A1) = - ke * A1    # model differential equation
        cp = A1 / v             # concentration in plasma
      })
    }

    expect_error(rxode2(pheno2), NA)

    mod <- rxode2(pheno2)

    et <- et(amt=1) %>% et(1:20) %>% et(id=1:20)

    expect_error(rxWithSeed(42, rxSolve(mod, et)), NA)
  })
})