test_that("C6CriticalSurfaceIntensity", {
  fctCSIC6 <- function(FUELTYPE, ISI, BUI, FMC, SFC, CBH, ROS, CFB, RSC, option)
  {
    stopifnot("C6" == FUELTYPE)
    stopifnot("RSC" == option)
    # feels like this should make sense, but fails when called from fbp() and not all C6
    # stopifnot("C6" == FUELTYPE)
    RSI <- intermediate_surface_rate_of_spread_c6(ISI)
    RSC <- crown_rate_of_spread_c6(ISI, FMC)
    RSS <- surface_rate_of_spread_c6(RSI, BUI)
    CSI <- critical_surface_intensity(FMC, CBH)
    return(CSI)
  }
  checkData('C6CriticalSurfaceIntensity',
            fctCSIC6,
            list(data.table(FUELTYPE=c("C6")),
                 data.table(ISI=ISI),
                 data.table(BUI=BUI),
                 data.table(FMC=FMC),
                 data.table(SFC=SFC),
                 data.table(CBH=CBH),
                 data.table(ROS=ROS),
                 data.table(CFB=CFB),
                 data.table(RSC=ROS),
                 data.table(option=c("RSC"))))
})