test_that("basic smoke test", {
  toy <- data.frame(
    age = c(55, 72), sex_txt = c("male", "female"),
    eGFR = c(45, 28), uACR = c(120, 800), dm = c(1, 0), htn = c(1, 1),
    albumin = c(4.2, 3.4), phosphorous = c(3.3, 4.6),
    bicarbonate = c(24, 22), calcium = c(9.1, 9.8)
  )
  rp <- RiskPredictor$new(
    df = toy,
    columns = list(
      age = "age", sex = "sex_txt",
      eGFR = "eGFR", uACR = "uACR",
      dm = "dm", htn = "htn",
      albumin = "albumin",
      phosphorous = "phosphorous", bicarbonate = "bicarbonate",
      calcium = "calcium"
    )
  )
  p4 <- rp$predict_kfre(2, TRUE, FALSE, 4, precision = 10)
  expect_equal(length(p4), 2)
})