R Under development (unstable) (2026-10-28 r90783 ucrt) -- "Unsuffered Consequences"
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> library(BATTS)
> # plot() methods draw without error, return the fit invisibly and use no
> # random numbers.
> pdf(NULL)
> set.seed(71)
> x1 <- rnorm(40); y1 <- rnorm(40, 0.5)
> x2 <- matrix(rnorm(160), ncol = 2)
> bad <- function(expr) tryCatch({expr; NA_character_}, error = conditionMessage)
> fb <- batts_boost(x1, y = y1, control = boost_control(num_trees_max = 10, K_CV = 2),
+                   quiet = TRUE)
> fb0 <- batts_boost(x1, y = y1, control = boost_control(num_trees_max = 5, K_CV = 0),
+                    quiet = TRUE)
> fs <- batts_bart(x1, y = y1, control = bart_control(num_trees = 4, burnin = 5, draws = 8),
+                  quiet = TRUE)
> fb2 <- batts_boost(x2, rep(0:1, each = 40),
+                    control = boost_control(num_trees_max = 5, K_CV = 0), quiet = TRUE)
> 
> seed <- .Random.seed
> v <- list(withVisible(plot(fb)), withVisible(plot(fb, which = "fit")),
+           withVisible(plot(fb0)), withVisible(plot(fs)),
+           withVisible(plot(fs, which = "fit", level = 0.8)),
+           withVisible(plot(fb, main = "custom", xlab = "trees", col = "red")))
> stopifnot(identical(.Random.seed, seed),
+           !any(vapply(v, `[[`, logical(1), "visible")),
+           identical(v[[1]]$value, fb), identical(v[[4]]$value, fs),
+           grepl("did not use cross-validation", bad(plot(fb0, which = "cv"))),
+           grepl("one variable", bad(plot(fb2, which = "fit"))),
+           grepl("level must be", bad(plot(fs, which = "fit", level = 2))),
+           grepl("should be one of", bad(plot(fs, which = "cv"))))
> dev.off()
null device 
          1 
> 
> cat("plot() checks passed.\n")
plot() checks passed.
> 
> proc.time()
   user  system elapsed 
   0.32    0.06    0.37